close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JP2009212772

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2009212772
An object of the present invention is to freely change an ear pad connected to a headphone in a
noise canceling system. SOLUTION: Information having different contents for each
predetermined type of the ear pad is stored in the ear pad side. When the ear pad is connected,
the headphone or the signal processing device connected to the headphone reads the ear pad
storage information, and sets the signal processing characteristic of the signal processing means
based on the ear pad storage information. Thereby, it is possible to automatically acquire
information according to the ear pad independently of the user operation, and set the signal
processing characteristic corresponding to the connected ear pad based on the acquired
information. [Selected figure] Figure 10
Headphone device, signal processing method, sound reproduction system
[0001]
The present invention relates to a headphone device in which a contact portion in contact with a
user's ear portion is detachably configured. The present invention also relates to a signal
processing method for performing signal processing on the signal to be output by the headphone
device according to the characteristic according to the contact portion. Furthermore, the present
invention relates to a sound reproduction system including the headphone device and the signal
processing device.
[0002]
JP-A-3-214892 JP-A-3-96199
10-04-2019
1
[0003]
There is known a so-called noise canceling system compatible with a headphone device, which is
designed to actively cancel external noises that are heard when playing back audio of content
such as music by using the headphone device. ing.
Such noise canceling systems are roughly classified into two systems: a feedback system and a
feedforward system.
[0004]
For example, in the above-mentioned Patent Document 1, an audio signal obtained by inverting
the phase of the noise inside the acoustic tube collected by the microphone unit provided in the
vicinity of the earphone (headphone) unit in the acoustic tube attached to the user's ear A
configuration in which external noise is reduced by generating the signal and outputting it as
sound from the earphone unit, that is, a configuration of a noise canceling system corresponding
to a feedback method is described. Further, in the above-mentioned Patent Document 2, as a
basic configuration thereof, a configuration according to which a characteristic according to a
predetermined transfer function is given to an audio signal obtained by collecting sound by a
microphone attached to a headphone device outer casing and output from the headphone device
That is, the configuration of the noise canceling system corresponding to the feed forward
method is described.
[0005]
In any of the feed forward method and the feedback method, the filter characteristic set for noise
canceling is such that voice from an external noise source reaches the user's ear position (noise
cancellation point), for example. The noise is set to be canceled at the position of the user's ear
based on various transfer functions such as the space transfer function up to and the
characteristics of the microphone amplifier and the headphone amplifier. At this time, since the
space transfer function is greatly influenced by the structure of the acoustic tube (housing part)
of the headphone device, the filter characteristics for noise canceling is one kind of the same
structure. It will be set assuming a headphone structure. In other words, in the noise canceling
10-04-2019
2
system, the filter characteristics should be set in a one-to-one relationship with respect to one
assumed headphone structure.
[0006]
At present, filters for noise canceling are configured by analog circuits. For this reason, in the
current noise canceling system, the filter (signal processing device) and the headphone structure
can be used only in a one-to-one combination assumed in advance. It should be noted for
confirmation that, when the filter is constituted by an analog circuit, a plurality of filter circuits
having different filter characteristics are provided to change the filter characteristics, and these
are switched to change the filter characteristics. It will be done. However, such a configuration is
unrealistic in terms of circuit mounting area and the like, and as a result, at present, the signal
processing device and the headphone device can be used only in an assumed one-to-one
combination. .
[0007]
Here, for example, as a headphone device, an ear pad portion in contact with the user's ear
portion (including an earpiece in an inner type headphone (earphone)) is assumed to be
detachable. At this time, it is assumed that a plurality of different types of ear pads are
detachable.
[0008]
As described above, in the case where a plurality of types of ear pads can be attached and
removed, when the ear pads are replaced, the spatial transfer function to the user's ear position
is also naturally different. That is, in this case, in order to properly obtain the noise canceling
effect, it is necessary to change and set the filter characteristic according to the mounted ear pad
(transfer function).
[0009]
As a configuration for variably setting filter characteristics, the present applicant has previously
10-04-2019
3
proposed a configuration in which a noise canceling filter is realized by a digital circuit. That is,
the noise canceling filter is realized by a digital filter such as an FIR (Finite Impulse Response)
filter. By adopting a noise canceling system using such a digital filter, changing of the filter
characteristics can be realized by changing the filter configuration and the filter coefficient, and
the configuration is simpler than in the case of configuring with an analog circuit. It can be done.
[0010]
Here, when the filter characteristic is variably set according to the ear pad to be used, it is
naturally necessary to identify which model (type) of the ear pad actually used corresponds to. In
such identification, for example, it is conceivable to acquire other information of the ear pad to
be used based on a user operation. However, in the case of performing identification based on
the user's input information, the user will inevitably be burdened with the operation, resulting in
a system lacking in convenience. In addition, in the case of performing identification based on the
user's operation input as described above, there is also a possibility that an ear pad different
from the ear pad actually used may be selected due to the user's misunderstanding or the like.
There is a problem that the cancellation effect can not be obtained.
[0011]
Therefore, in consideration of the above-described problems, the present invention is configured
as a headphone device as follows. That is, the headphone device of the present invention is a
headphone device in which the contact portion in contact with the ear portion of the user is
detachably configured, and includes an audio output unit including a diaphragm and performing
audio output. Further, the signal processing means is provided to perform signal processing so as
to give a required signal characteristic to the signal supplied to the voice output means. The
information processing device further includes an information reading unit that reads contact
area storage information stored in the contact area and configured to have different information
contents for each predetermined type of the contact area. And control means for controlling the
signal processing characteristic of the signal processing means based on the contact part side
stored information read by the information reading means.
[0012]
Further, in the present invention, it is configured as follows as a sound reproduction system
10-04-2019
4
configured to include a headphone device and a signal processing device. That is, the sound
reproduction system according to the present invention comprises a headphone device in which
a contact portion in contact with a user's ear is detachably configured, and a signal processing
device for generating a signal input when the headphone device performs audio output. A signal
processing means provided in the signal processing device and performing signal processing in
such a manner that the signal supplied to the headphone device is provided with a required
signal characteristic. Prepare. The information processing device further includes an information
reading unit that reads contact area storage information stored in the contact area and
configured to have different information contents for each predetermined type of the contact
area. The signal processing apparatus further includes control means for controlling the signal
processing characteristic of the signal processing means based on the contact part side stored
information read by the information reading means.
[0013]
According to the above configuration, when the contact portion (ear pad) is connected to the
headphone device, the contact portion side stored information stored in the contact portion is
stored on the main body side (the headphone device provided with the signal processing means,
Alternatively, the signal processing device) will acquire it automatically. That is, the information
for each contact portion can be automatically acquired regardless of the user operation. And
based on the contact part side storage information acquired in this way, the signal processing
characteristic of the signal processing means is set (changed) to the characteristic according to
the connected contact part. Thereby, the proper signal processing characteristic according to the
another of the contact part to be used can be automatically set by the main body side.
[0014]
According to the present invention, stored information for each contact portion (ear pad) can be
automatically acquired without user operation. And based on the contact part side storage
information acquired in this way, the signal processing characteristic of a signal processing
means can be set (changed) to the characteristic defined according to the connected contact part.
That is, according to the present invention, it is possible to automatically set on the main body
side appropriate signal processing characteristics according to the different ear pads to be used,
thereby realizing an excellent system that does not impose a burden on the user. It is possible. At
the same time, it is possible to effectively prevent the occurrence of a situation in which an
incorrect signal processing characteristic is set due to a user's operation input error or the like
and proper sound reproduction can not be performed.
10-04-2019
5
[0015]
In addition, if the present invention is applied to a noise canceling system, it is possible to realize
an excellent noise canceling system in which the ear pad can be freely changed.
[0016]
The best mode for carrying out the present invention (hereinafter referred to as the embodiment)
will be described below.
In the embodiment, a noise canceling system is taken as an example of a sound reproduction
system configured to include a headphone device. Therefore, first, prior to describing the
configuration of the system according to the present embodiment, the basic concept of the noise
canceling system will be described.
[0017]
<Basic concept of noise canceling system> As a basic system of the noise canceling system, a
system in which servo control is performed by a feedback (FeedBack: FB) system and a system in
which a feed forward (FeedForward: FF) system are known are known. It is done. First, the FB
method will be described with reference to FIG.
[0018]
Fig. 1 (a) schematically shows a model example of a noise canceling system by the FB system on
the side of the right ear (R channel in 2-channel stereo by L (left) and R (right) of the headphone
wearer (user). Is shown. In the structure on the R channel side of the headphone device here,
first, the driver 202 is provided in a position corresponding to the right ear of the user 500
wearing the headphone device in the housing unit 201 corresponding to the right ear. . The
driver 202 has the same meaning as a so-called speaker provided with a diaphragm, and is
driven by the amplified output of the audio signal to emit the audio into space so as to be output.
At this time, an ear pad 201a is provided in the housing portion 201 so as to be inserted between
the housing portion 201 and the ear portion (including the portion covering the ear) of the user
10-04-2019
6
500 as shown in the drawing.
[0019]
In the FB system shown in this figure, the microphone 203 is provided at a position near the
right ear of the user 500 in the housing portion 201. Depending on the microphone 203
provided in this manner, the sound output from the driver 202 and the sound that is going to
intrude into the housing portion 201 from the external noise source 301 and reach the right ear,
that is, the right ear The external noise in the housing 302, which is an external sound to be
generated, is picked up. The noise source 301 leaks out as a sound pressure from the gap of the
ear pad 201a, for example, or the housing of the headphone device vibrates upon receiving the
sound pressure of the noise sound source 301 as a cause of the noise 302 in the housing.
Transmission to the inside of the housing portion 201 can be mentioned. In order to cancel
(attenuate, reduce) the noise 302 in the housing, such as a signal having an inverse characteristic
to the sound signal component of the external sound, from the sound signal obtained by
collecting the sound by the microphone 203 Signal (audio signal for cancellation) is generated,
and this signal is fed back so as to be synthesized with an audio signal (audio source) of a
necessary sound for driving the driver 202. Thus, at the noise cancellation point 400 set at a
position corresponding to the right ear in the housing unit 201, the external sound is canceled by
synthesizing the output sound from the driver 202 and the component of the external sound. A
sound is obtained and the user's right ear will hear this sound. Then, by giving such a
configuration also to the L channel (left ear) side, a noise canceling system as a headphone
device corresponding to normal L, R 2 channel stereo can be obtained.
[0020]
The block diagram of FIG. 1B shows an example of a basic model configuration of a noise
canceling system according to the FB method. In FIG. 1 (b), as in FIG. 1 (a), the configuration
corresponding to only the R channel (right ear) side is shown, and the L channel (left The same
system configuration is provided for the side of the ear. Also, the block shown in this figure
indicates one specific transfer function corresponding to a specific circuit part, circuit system,
etc. in the system of the noise canceling system by the FB system, and here, it is called a transfer
function block Make it The character shown in each transfer function block represents the
transfer function of the transfer function block, and the voice signal (or voice) is transferred to
the transfer function indicated there each time it passes through the transfer function block. Will
be given.
10-04-2019
7
[0021]
First, the sound collected by the microphone 203 provided in the housing unit 201 is a transfer
function block corresponding to the microphone 203 and a microphone amplifier that amplifies
the electric signal obtained by the microphone 203 and outputs the sound signal. It will be
obtained as an audio signal via 101 (transfer function M). The voice signal having passed
through the transfer function block 101 is input to the synthesizer 103 via a transfer function
block 102 (transfer function -β) corresponding to an FB (FeedBack) filter circuit. The FB filter
circuit is a filter circuit in which the characteristic for generating the above-described canceling
audio signal is set from the audio signal obtained by collecting the sound by the microphone
203, and the transfer function thereof is represented as -β. It is
[0022]
Also, here, the audio signal S of the audio sound source, which is the content such as music, is
assumed to be subjected to equalization by the equalizer, and the synthesizer via the transfer
function block 107 (transfer function E) corresponding to this equalizer It is input to 13. Note
that, in the FB method, the microphone 203 for noise collection is provided in the housing unit
201 to equalize the audio signal S in this manner, and not only the noise sound but also the
output voice from the driver 202 is collected. Derived from That is, as the microphone 203 also
picks up the component of the audio signal S in this way, in the FB system, the transfer function β is also given to the audio signal S. The sound quality may be degraded. Therefore, in order to
suppress the sound quality deterioration due to the transfer function -β in advance, the required
signal characteristics are given to the audio signal S by equalizing.
[0023]
The combiner 103 combines the above two signals by addition. The audio signal synthesized in
this manner is amplified by the power amplifier and is output as a drive signal to the driver 202,
whereby the driver 202 is output as audio. That is, the voice signal from the synthesizer 103
passes through the transfer function block 104 (transfer function A) corresponding to the power
amplifier, and further passes through the transfer function block 105 (transfer function D)
corresponding to the driver 202 as voice. It is released into space. The transfer function D of the
driver 202 is determined by, for example, the structure of the driver 202.
10-04-2019
8
[0024]
Then, the voice output by the driver 202 passes through the transfer function block 106
(transfer function H) corresponding to the spatial path (spatial transfer function) from the driver
202 to the noise cancel point 400, and the noise cancel point 400 , And are combined with the
in-housing noise 302 in that space. Then, as the sound pressure P of the output sound that is to
reach, for example, the right ear from the noise cancellation point 400, the sound of the noise
sound source 301 entering from the outside of the housing unit 201 is canceled. Note that, for
confirmation, the transfer function H is determined by the structure (material, shape, assembly
method, etc.) of the housing portion 201 and the ear pad 201a. That is, when the ear pad 201a is
made changeable, this transfer function H also changes.
[0025]
Here, in the system of the model of the noise canceling system shown in FIG. 1 (b), the sound
pressure P of the output sound is N in the housing noise 302 and S in the audio signal of the
audio source. Then, the transfer functions “M, −β, E, A, D, H” shown in each transfer function
block are used to be represented as the following [Expression 1]. In this [Expression 1], focusing
on N which is the noise 302 in the housing, it is understood that N is attenuated by a coefficient
represented by 1 / (1 + ADHMβ).
[0026]
However, in order to operate stably without causing the system of [Equation 1] to oscillate in the
noise reduction target frequency band, it is necessary that the following [Equation 2] is
established.
[0027]
Generally speaking, when the absolute value of the product of each transfer function in the noise
canceling system by the FB method is expressed by 1 << | ADHMβ | and combined with the
stability determination of Nyquist in the classical control theory. And [Expression 2] can be
interpreted as follows.
10-04-2019
9
Here, in the system of the noise canceling system shown in FIG. 1B, consider the system
represented by (−ADHMβ) obtained by cutting one portion of the loop portion related to N
which is the noise 302 in the housing . We will call this system "open loop" here. As an example,
if the transfer function block 101 corresponding to the microphone and the microphone
amplifier and the transfer function block 102 corresponding to the FB filter circuit are portions
to be disconnected, the above-described open loop can be formed.
[0028]
The above-mentioned open loop is assumed to have, for example, the characteristics shown by
the Bode diagram of FIG. In this Bode diagram, the frequency is shown on the horizontal axis, the
gain is shown on the lower half, and the phase is shown on the upper half. When this open loop
is targeted, the following two conditions need to be satisfied in order to satisfy [Equation 2]
based on the stability determination of Nyquist. Condition 1: Phase 0 deg. When passing through
the point (0 degrees), the gain must be less than 0 dB. Condition 2: When the gain is 0 dB or
more, the phase 0 deg. Do not include the points of
[0029]
When the above two conditions 1 and 2 are not satisfied, the positive feedback is applied to the
loop to cause oscillation (howling). In FIG. 2, phase margins Pa and Pb corresponding to the
above-mentioned condition 1 and gain margins Ga and Gb corresponding to the condition 2 are
shown. If the margin is small, the possibility of oscillation will increase due to various individual
differences among users who use the headphone device to which the noise canceling system is
applied, and variations in the state when the headphone device is worn. For example, in FIG. The
gain when passing through the point is smaller than 0 dB, and gain margins Ga and Gb are
obtained accordingly. However, for example, temporarily phase 0 deg. The gain when passing
through the point is 0 dB or more and the gain margins Ga and Gb disappear, or the phase 0 deg.
If the gain when passing through the point is less than 0 dB, the gain margins Ga and Gb become
close to 0 dB, and oscillation will occur or the possibility of oscillation will increase. Similarly, in
FIG. 2, when the gain is 0 dB or more, the phase 0 deg. The phase margin Pa, Pb is obtained.
However, for example, when the gain is 0 dB or more, the phase 0 deg. It has passed the point of
Alternatively, phase 0 deg. When the phase margins Pa and Pb become smaller, the oscillation or
the possibility of oscillation increases.
[0030]
10-04-2019
10
Next, in the configuration of the noise canceling system of the FB system shown in FIG. 1 (b), in
addition to the above-mentioned function of canceling (reducing) the external sound (noise),
necessary sound (necessary sound) The case of reproduction output will be described. Here, as
the required sound, for example, an audio signal S of an audio sound source as content such as
music is shown. In addition, as this audio | voice signal S, it is considered besides the thing of a
content similar to musical or this. For example, when the noise canceling system is applied to a
hearing aid or the like, a microphone provided outside the housing to pick up the surrounding
necessary sound (different from the microphone 203 provided in the system for noise
cancellation) It becomes an audio signal obtained by sound collection. When applied to what is
called a so-called headset, it becomes an audio signal such as the other party's speaking voice
received by communication such as telephone communication. That is, the audio signal S
corresponds to general audio that needs to be reproduced and output according to the
application of the headphone device.
[0031]
First, in the above [Equation 1], attention is paid to the audio signal S of the audio sound source.
Then, it is assumed that the transfer function E corresponding to the equalizer is set as having a
characteristic represented by the following [Equation 3]. The transfer characteristic E is
substantially the reverse characteristic (1 + open loop characteristic) with respect to the open
loop when viewed on the frequency axis. Then, when the equation of the transfer function E
represented by this [Equation 3] is substituted into [Equation 1], the sound pressure P of the
output sound in the model of the noise canceling system shown in FIG. It can express like
[formula 4] of. Of the transfer functions A, D and H shown in the term of ADHS in [Equation 4],
the transfer function A corresponds to the power amplifier, the transfer function D corresponds
to the driver 202, and the transfer function H cancels the noise from the driver 202 Since it
corresponds to the space transfer function of the path up to the point 400, if the position of the
microphone 203 in the housing part 201 is in a position close to the ear, the sound signal S does
not have a noise cancellation function. It can be seen that the same characteristics as the normal
headphones can be obtained.
[0032]
Next, the noise canceling system by the FF method will be described. FIG. 3A shows, as an
example of a model of a noise canceling system based on the FF method, the configuration on the
10-04-2019
11
side corresponding to the R channel as in FIG. 1A. In the FF system, the microphone 203 is
provided on the outside of the housing portion 201 so that voices arriving from the noise source
301 can be picked up. Then, an external voice collected by the microphone 203, that is, a voice
that has arrived from the noise source 301 is collected to obtain a voice signal, the voice signal is
subjected to an appropriate filtering process, and the canceling audio signal is obtained. Will be
generated. Then, this canceling audio signal is synthesized with the audio signal of the required
sound. That is, the cancel audio signal that electrically simulates the acoustic characteristic from
the position of the microphone 203 to the position of the driver 202 is synthesized with the
audio signal of the necessary sound. Then, by causing the driver 202 to output an audio signal in
which the canceling audio signal and the audio signal of the required sound are synthesized in
this way, the noise source 301 to the housing portion 201 can be obtained as the sound obtained
at the noise cancellation point 400 You will now hear the canceled sound coming inside.
[0033]
FIG. 3B shows the configuration of the side corresponding to one channel (R channel) as a basic
model configuration example of the noise canceling system by the FF method. First, the sound
collected by the microphone 203 provided outside the housing portion 201 is obtained as an
audio signal via the transfer function block 101 having the transfer function M corresponding to
the microphone 203 and the microphone amplifier. Next, the voice signal that has passed
through the transfer function block 101 is input to the synthesizer 103 via a transfer function
block 102 (transfer function −α) corresponding to an FF (FeedForward) filter circuit. The FF
filter circuit 102 is a filter circuit in which the characteristic for generating the above-described
canceling audio signal is set from the audio signal obtained by collecting the sound by the
microphone 203, and the transfer function thereof is expressed as −α. It is
[0034]
Also, the audio signal S of the audio source here is directly input to the synthesizer 103. The
audio signal synthesized by the synthesizer 103 is amplified by the power amplifier and output
to the driver 202 as a drive signal, so that the driver 202 is output as audio. That is, also in this
case, the audio signal from the synthesizer 103 passes through the transfer function block 104
(transfer function A) corresponding to the power amplifier, and further the transfer function
block 105 (transfer function D) corresponding to the driver 202. It is emitted into space as voice
via. Then, the voice output by the driver 202 reaches the noise cancellation point 400 via the
transfer function block 106 (transfer function H) corresponding to the spatial path (spatial
transfer function) from the driver 202 to the noise cancellation point 400. Here, it is combined
10-04-2019
12
with the noise 302 in the housing in space.
[0035]
Also, as shown by a transfer function block 110, the path from the noise source 301 to the noise
cancellation point 400 until the sound emitted from the noise source 301 intrudes into the
housing portion 201 and reaches the noise cancellation point 400. A transfer function (space
transfer function F) corresponding to is given. On the other hand, the microphone 203 picks up a
voice that is supposed to arrive from the noise source 301 which is an external voice, but at this
time, the sound (noise) emitted from the noise source 301 is the microphone 203. By the time it
reaches, as shown as the transfer function block 111, the transfer function (spatial transfer
function G) corresponding to the path from the noise source 301 to the microphone 203 will be
given. As an FF filter circuit corresponding to the transfer function block 102, a transfer function
-α is set in consideration of the above space transfer functions F and G. As a result, the sound
pressure of the noise source 301 entering from the outside of the housing portion 201 is
canceled as the sound pressure P of the output sound that is to reach the right ear, for example,
from the noise cancellation point 400.
[0036]
In the case of the FF method, the transfer function F (the noise source 301 to the noise
cancellation point 400) is also changed along with the transfer function H by changing the ear
pad 201a.
[0037]
In the system of the noise canceling system model according to the FF system shown in FIG. 3B,
the sound pressure P of the output sound is N for noise generated by the noise source 301 and S
for the audio signal of the audio source. Then, the transfer function “M, −α, E, A, D, H” shown
in each transfer function block is used to be represented by the following [Expression 5].
Also, ideally, the transfer function F of the path from the noise source 301 to the cancellation
point 400 can be expressed as in the following [Equation 6]. Next, when [Equation 6] is
substituted into [Equation 5], the first term and the second term on the right side will be offset.
From this result, the sound pressure P of the output sound can be expressed as in the following
[Equation 7].
10-04-2019
13
[0038]
In this way, it is indicated that the sound arriving from the noise source 301 is canceled, and only
the audio signal of the audio source is obtained as voice. That is, in theory, in the right ear of the
user, the noise-cancelled voice can be heard. However, in reality, it is very difficult to construct a
complete FF filter circuit that can provide a transfer function such that [Equation 6] is completely
satisfied. In addition, the shape of the ear by a person, the individual difference in how to wear a
headphone device is relatively large, and the change in the relationship between the noise
generation position and the microphone position is a noise particularly in the middle and high
frequency band. It is known to affect the reduction effect. For this reason, with regard to the
middle and high frequencies, active noise reduction processing is avoided, and passive sound
insulation is often performed mainly depending on the structure of the housing of the headphone
device and the like. Further, for confirmation, [Equation 6] means that the transfer function of the
path from the noise source 301 to the ear is imitated by the electric circuit including the transfer
function -α.
[0039]
Further, in the noise canceling system of the FF system shown in FIG. 3A, since the microphone
203 is provided outside the housing, the noise canceling system of the FB system of FIG.
Differently, it can be arbitrarily set by the housing unit 201 so as to correspond to the listener's
ear position. However, in general, the transfer function -α is fixed, and at the design stage, it is
decided to target some target characteristics. On the other hand, the shape of the ear differs
depending on the listener. For this reason, there is also a possibility that a phenomenon such as a
sufficient noise cancellation effect can not be obtained or noise components are added in a nonreversed phase to cause abnormal noise. Because of this, the FF method generally has low
possibility of oscillation and high stability, but it is considered difficult to obtain a sufficient
amount of noise attenuation (cancellation amount). On the other hand, it is said that the FB
method requires attention to the stability of the system instead of expecting a large amount of
noise attenuation. As described above, the FB method and the FF method each have features.
[0040]
<Headphone Device According to Embodiment> [Internal Configuration of Headphone Device]
10-04-2019
14
FIG. 4 is a block diagram showing an internal configuration of the headphone 1 as an
embodiment of the headphone device according to the present invention. The headphones 1 are
configured so that various types of ear pads can be attached and detached as ear pads 15
described later. Here, the types of ear pads to which the headphones 1 of this example
correspond are shown in the following FIG.
[0041]
As shown in FIG. 5, the headphones 1 of this example are (1) ultra-low resilience, extremely thick
type ear pads, (2) heater built-in type ear pads, (3) moisturized / warm type ear pads, (4 The
present invention is applicable to ear pads having different structures such as high heat
dissipation type ear pads and (5) decorative type ear pads. Among these, the ear pad 15 of the
heater built-in type (2) is configured to supply power to the heater when connected to the
headphones 1. The high heat radiation type ear pad 15 of (4) may be provided with a cooling
element such as a Peltier element, for example, in which case power supply to the cooling
element when connected to the headphone 1 is Configured to be done. In the following
description, although the description of the configuration of the headphone 1 side and the ear
pad 15 side for the power supply is omitted, the specific configuration is to supply power to a
predetermined position on the headphone 1 side. A supply terminal may be provided, and an
input terminal for receiving power supply may be provided on the ear pad 15 side at a position
in contact with the supply terminal when connected to the headphone 1.
[0042]
Here, in the case of the present embodiment, ID information for identifying the type (model) of
the ear pad is predetermined for the ear pad 15 that can be handled by the headphone 1 as
shown in FIG. The type of ear pad 15 is ID: 0, the type of ear pad 15 of type (2) is ID: 1, the type
of ear pad 15 of type (3) is ID: 2, and the type of ear pad of type (4) An ID: 3 is assigned to 15
and an ID: 4 is assigned to the ear pad 15 of the type (5).
[0043]
In addition, in this FIG. 5, although the case where headphones 1 are made into what is called socalled ear-cover type or ear-loading type is illustrated, the expression "ear pad" is used about the
contact part which touches a listener's ear part. In the form of “headphones” also includes socalled inner types (earphones), and “contacts” are inserted into the ear holes of the listener in
such inner type headphones And so-called earpieces.
10-04-2019
15
Also, as mentioned earlier, "ear part" includes not only the ear itself but also a part covering the
ear (around the ear).
[0044]
The explanation is returned to FIG. In FIG. 4, the headphone 1 is provided with a microphone
MIC as a configuration corresponding to the noise canceling system. A collected sound signal by
the microphone MIC is amplified by the microphone amplifier 2, then converted into a digital
signal by the A / D converter 3, and supplied to a DSP (Digital Signal Processor) 5.
[0045]
The installation position of the microphone MIC differs depending on whether the headphone
device 1 is a headphone device compatible with the FF system or a headphone device compatible
with the FB system as shown in FIG. FIG. 6A schematically shows the structure of the headphone
1 when the headphone device compatible with the FF system is used, and FIG. 6B schematically
shows the headphone device compatible with the FB system. As shown in these figures, the
headphone 1 has an Lch housing portion 1L and an Rch housing portion 1R. In both the FF
method and the FB method, the Lch driver DRV-L is provided in the Lch housing portion 1L, and
the Rch driver DRV-R is provided in the Rch housing portion 1R.
[0046]
Then, in the case of the FF system of FIG. 6A, the microphone MIC-L of Lch is provided outward
in the Lch housing portion 1L. That is, it is provided so as to pick up the sound generated in the
outside world of the housing portion 1L. Similarly, the microphone MIC-R of Rch is also provided
outward in the Rch housing portion 1R.
[0047]
On the other hand, in the case of the FB system of FIG. 6B, the microphone MIC-L of Lch is
10-04-2019
16
provided inward in the Lch housing portion 1L. That is, it is provided to pick up the sound in the
housing portion 1L, specifically, the sound heard by the right ear of the listener. Similarly, the
microphone MIC-R of Rch is also provided inwardly at the Rch housing portion 1R.
[0048]
Here, in FIG. 4, for convenience of illustration, the number of ch (channels) of the audio signal is
1 channel, but as can be understood from the description of FIG. 6, headphone 1 actually has 2
channels of Lch and Rch. It handles audio signals. That is, in FIG. 4, two microphones for Lch and
for Rch are actually provided as the microphone MIC, the microphone amplifier 2 and the A / D
converter 3 described above. Similarly, two audio input terminals TAin and two A / D converters
4 for Lch and Rch are provided as the audio input terminal TAin and the A / D converter 4 which
will be described later. Furthermore, each of the components (NC filter 5a, equalizer (EQ) 5b,
adder 5c), D / A converter 6, power amplifier 7 and driver DRV for the Lch and Rch are provided
in the DSP 5 respectively. become.
[0049]
In FIG. 4, an audio input terminal TAin is provided, for example, for inputting an audio signal
reproduced by an external audio player or the like. The audio signal input through the audio
input terminal TAin is converted into a digital signal by the A / D converter 4 and then supplied
to the DSP 5.
[0050]
The DSP 5 implements digital signal processing based on a program (not shown) stored in, for
example, the memory 10 in the figure, to realize the operation as each functional block shown in
the figure. Specifically, the DSP 5 performs equalizing processing on the audio signal (audio data)
supplied from the A / D converter 4 as a functional operation shown as an equalizer (EQ) 5 b in
the drawing. For example, the equalizer 5b can be realized by an FIR (Finite Impulse Response)
filter or the like. Further, as a functional operation shown as an NC (noise canceling) filter 5a in
the figure, it is detected as a sound collection signal (sound collection data) detected by the
microphone MIC and inputted through the microphone amplifier 2 → A / D converter 3 And
provide signal characteristics for noise canceling. The NC filter 5a can also be configured by, for
example, an FIR filter. Further, as a functional operation shown as an adder 5c in the drawing,
10-04-2019
17
the audio data processed by the above-mentioned equalizer 5b and the collected sound data
processed by the above NC filter 5a are added. The data obtained by the addition processing as
the adder 5c is called addition data. The addition data is obtained by adding the collected sound
data to which the characteristic for noise canceling is given by the NC filter 5a. Therefore, the
sound output (sound reproduction) based on the addition data is performed by the driver DRV,
whereby the user wearing the headphone 1 can be perceived as having the noise component
canceled.
[0051]
In the case of the present embodiment, the DSP 5 also performs processing for variably setting
the filter characteristics of the NC filter 5a based on the ID information instructed from the
microcomputer 8 as described later. Illustration is omitted about the functional block which
performs setting processing of such a filter characteristic.
[0052]
Further, when the equalizer 5b in the DSP 5 is the headphone 1 corresponding to the FB system,
it functions as a filter (equalizer 107 in FIG. 1) for giving a characteristic for suppressing the
sound quality deterioration to the audio data. It becomes a thing.
According to the above description, in the case of the FF method, equalizing to audio data is not
essential, but in the case of the headphone 1 corresponding to the FF method, for example, the
equalizer 5b simply performs required equalization processing You can think of it as something
that functions as
[0053]
The addition data obtained by the DSP 5 as described above is converted to an analog signal by
the D / A converter 6, and then amplified by the power amplifier 7 and output by the driver DRV.
That is, sound reproduction according to the audio signal as the addition data is performed.
[0054]
10-04-2019
18
Further, the headphone 1 is provided with a microcomputer 8. The microcomputer 8 includes a
ROM (Read Only Memory), a RAM (Random Access Memory), a CPU (Central Processing Unit),
and the like, and is based on a program stored in storage means such as the ROM or the memory
10, for example. The overall control of the headphones 1 is performed by performing various
control processes and calculations.
[0055]
A detection signal from the pad connection detection unit 9 shown in the figure is input to the
microcomputer 8. Although the description by illustration is omitted, the pad connection
presence / absence detection unit 9 is a mechanical switch provided so as to be pressed by, for
example, a convex portion formed on the ear pad 15 in response to the connection of the ear pad
15 It comprises and is constituted. The pad connection detection unit 9 is turned on when the ear
pad 15 is connected, and turned off when the ear pad 15 is removed (the connection is released).
The microcomputer 8 determines the presence or absence of the connection of the ear pad 15
based on the ON / OFF signal output from the connection presence / absence detection unit 9
according to the ON / OFF of the mechanical switch.
[0056]
Further, particularly in the case of the present embodiment, the microcomputer 8 is configured
to obtain an electrical signal corresponding to the physical structural pattern given to the ear pad
15 for storing the above-mentioned ID information. It is connected to the unit 11. The
microcomputer 8 receives the detection signal from the structural pattern detection unit 11 and
executes processing for acquiring the ID, which will be described later.
[0057]
Here, ID-filter characteristic correspondence information 10 a is stored in the memory 10 which
can be read by the microcomputer 8. The ID-filter characteristic correspondence information 10a
is, as shown in FIG. 7, the information of the ID attached to each of the ear pads 15 of each type
to which the headphone 1 can correspond, presented in FIG. When the ear pad 15 of the type
specified by the ID is connected, the information of the filter characteristic determined to be set
by the NC filter 5a is regarded as the associated information. As shown in FIG. 7, filter
characteristic information as type 0 is associated with ID: 0. Similarly, filter characteristic
10-04-2019
19
information as type 1 for ID: 1, type 2 for ID: 2, type 3 for ID: 3, and type 4 for ID: 4 is also
associated. . It should be noted that, for the purpose of confirmation, the filter characteristics are
determined by, for example, the configuration (number of stages etc.) of the FIR filter as the NC
filter 5a and the filter coefficient. As the filter characteristic information, parameter information
on the filter configuration and the filter coefficient is stored.
[0058]
[Configuration for Ear Pad Identification] Here, in the present embodiment, as the ear pad 15
connected to the headphone 1, an appropriate noise canceling effect can be obtained
corresponding to a plurality of types of ear pads 15. The purpose is to The ear pad 15 is an
acoustic component itself, and the degree of shielding of noise from the outside, the degree of
absorption of sound generated from the driver DRV, and the degree of acoustic impedance seen
from the driver DRV due to differences in the material, shape and assembly method. And so on.
For this reason, when the type of ear pad 15 to be used is changed, various spatial transfer
functions (H and F) which are premised on setting the characteristics of the NC filter as described
above are also changed, and the result is It is necessary to change the filter characteristic of the
NC filter 5a when the type of the ear pad 15 to be used is changed.
[0059]
Here, when the filter characteristics are variably set with respect to the NC filter 5a according to
the type of the ear pad 15 to be attached, the type of the ear pad 15 actually used corresponds to
any type as a matter of course Need to identify. In such identification, for example, it is
conceivable to acquire other information of the ear pad 15 to be used based on the user
operation, but in the case of performing identification based on the user's input information, the
user is inevitably burdened with the operation. It will be a system that is not easy to use. In
addition, in the case of performing identification based on the user's operation input as described
above, there is also a possibility that an ear pad 15 different from the ear pad 15 actually used
may be selected due to the user's misunderstanding or the like. Noise can not be obtained.
[0060]
Therefore, in the present embodiment, a method is adopted in which the information for each ear
pad 15 is stored in the ear pad 15 and the stored information is read on the headphone 1 side.
10-04-2019
20
As such a method, first, in Examples 1 to 3 described below, ID information representing the type
of the ear pad 15 side (ID: 0 to ID: 4 shown in FIG. 5) Are stored in a physical structural pattern,
and a detection unit (structural pattern detection unit 11) for detecting another of the structural
patterns is provided on the headphone 1 side, and the information of the ID is detected based on
the detection result of the detection unit. We propose a method of acquiring
[0061]
Embodiment 1 FIG. 8 is a diagram for explaining the configuration of the headphone 1 and the
ear pad 15 as the embodiment 1. In FIG. 8A, the structure of the Lch housing portion 1L in the
headphone 1 and the structure of the ear pad 15 This is shown by a perspective view, and FIG. 8
(b) schematically shows a wiring state inside of each electrode on the headphone 1 side.
[0062]
In the first embodiment, the ID information is stored and read according to the presence or
absence of the conductive portion at a predetermined position on the ear pad 15 side.
First, positioning convex portions Xh1, Xh2 and Xh3 for connecting the ear pad 15 in a
predetermined positional relationship to the surface connected to the ear pad 15 are provided in
the Lch housing portion 1L in this case. Then, corresponding to this, positioning concave
portions Xp1, Xp2, Xp3 are provided on the ear pad 15 side, in which the positioning convex
portions Xh1, Xh2, Xh3 are fitted to the surface connected to the Lch housing portion 1L. That is,
the ear pads 15 are connected to the Lch housing portion 1L in a predetermined predetermined
positional relationship by fitting each of the sets of Xh1-Xp1, Xh2-Xp2, and Xh3-Xp3. .
[0063]
Then, in the ear pad 15 in this case, as shown in FIG. 8A, the first conductive portion forming
position P1 and the second conductive portion are formed at a predetermined position on the
surface connected to the Lch housing portion 1L side. The position P2, the third conductive
portion forming position P3, the fourth conductive portion forming position P4, and the fifth
conductive portion forming position P5 are respectively set. Then, ID information is stored
depending on the presence or absence of the conductive portion at each of the formation
positions P1, P2, P3, P4, and P5. In the example of this figure, the conductive portions are
formed at all of the first conductive portion forming position P1, the second conductive portion
10-04-2019
21
forming position P2, the third conductive portion forming position P3, the fourth conductive
portion forming position P4, and the fifth conductive portion forming position P5. Shows the
case where is formed. As shown in the figure, the first conductive portion formation position P1
is formed at the first conductive portion Ep1, the second conductive portion formation position
P2 is formed at the second conductive portion Ep2, and the third conductive portion formation
position P3. The third conductive portion Ep3 is formed, the fourth conductive portion forming
position P4 is formed the fourth conductive portion Ep4, and the fifth conductive portion
forming position P5 is the fifth conductive portion. In this case, the conductive portions Ep1, Ep2,
Ep3, Ep4, and Ep5 are formed by attaching a conductive metal plate.
[0064]
On the other hand, on the headphone 1 side, a pair of [first electrodes Eh1a and Eh1b], a pair of
[second electrodes Eh2a and Eh2b], and [third electrode] with respect to the connection surface
of the Lch housing portion 1L with the ear pad 15 A set of Eh3a · Eh3b], a set of [fourth
electrodes Eh4a · Eh4b], and a set of [fifth electrodes Eh5a · Eh5b] are provided. The pair of [first
electrodes Eh1a and Eh1b] corresponds to the first pair of electrodes Ep when the ear pads 15
are connected in a predetermined positional relationship by the positioning convex portions Xh
and the positioning concave portions Xp described above. The pair of [second electrodes Eh2a
and Eh2b] is in contact with the conductive portion forming position P1, and the pair of [third
electrodes Eh3a and Eh3b] is in the third conductive portion forming position. In contact with P3,
the set of [fourth electrodes Eh4a and Eh4b] is in contact with the fourth conductive portion
formation position P4, and the set of [fifth electrodes Eh5a and Eh5b] is in contact with the fifth
conductive portion formation position P5 Provided.
[0065]
Here, as shown in FIG. 8B, the [first electrodes Eh1a and Eh1b] [second electrodes Eh2a and
Eh2b] [third electrodes Eh3a and Eh3b] [fourth electrodes Eh4a and Eh4b] [fifth electrodes
Among the electrodes Eh1 b, Eh2 b, Eh3 b, Eh 4 b, and Eh 5 b, of the electrodes Eh 5 a and E h 5
b], each is grounded. On the other hand, the electrodes Eh1a, Eh2a, Eh3a, Eh4a, Eh5a are
connected to the microcomputer 8 through lines to which bias voltages at predetermined levels
are applied. Incidentally, the notation “2.8 V” in the drawing indicates a voltage level which is
digitally treated as H (High).
[0066]
10-04-2019
22
With the above-described configuration on the headphone 1 side, the structural pattern detection
unit 11 is formed to detect the presence or absence of the conductive portion Ep at each
conductive portion forming position P on the ear pad 15 side by an electric signal. In this case,
when the conductive part Ep is formed at a certain conductive part forming position P, the line
connected to the corresponding electrode Eh of the electrodes Eh1a, Eh2a, Eh3a, Eh4a, Eh5a on
the Lch housing part 1L side is L When the conductive part Ep is not formed, the line connected
to the corresponding electrode Eh becomes H. The microcomputer 8 obtains ID information
stored depending on the presence / absence of the conductive portion Ep on the ear pad 15 side
by determining the H / L of the electric signal obtained by the line connected to each electrode
Eh. Can.
[0067]
In addition, although the case where five conducting part formation positions P are used is
illustrated here, in this case, a total of 2 <5> = 32 kinds of expressions are possible in this case.
That is, up to 32 types of ear pads 15 can be identified.
[0068]
Here, in the example described above, a metal plate is attached as each conductive portion Ep,
but as shown in FIG. 9 below, for example, as each conductive portion Ep, a connecting surface
with the Lch housing portion 1L It can also be formed by exposing two independent electrodes to
each other and wiring these electrodes internally. In this case, with respect to the two electrodes
formed on the surface of each conductive portion formation position P, the presence / absence of
the conductive portion Ep can be expressed by wiring / connecting them internally. In the
example of FIG. 9, the case where two electrodes in all the conductive part formation positions P
are wired is shown. That is, the case where the conductive part Ep is formed in each conductive
part formation position P is illustrated.
[0069]
Also in the case of such a structure of the conductive portion Ep, as the structural pattern
detection portion 11 on the headphone 1 side, as shown in FIG. 9, one having the same
10-04-2019
23
configuration as that of the previous case of FIG. 8 is used. As a result, as in the case of FIG. 8, the
ID information stored in the ear pad 15 can be read.
[0070]
According to the configuration as the first embodiment described above, on the headphone 1
side, the ID information stored in the connected ear pad 15 can be read. In this example, based
on the ID information read in this manner, processing for causing the NC filter 5a to set a filter
characteristic determined to be preset according to the type of the connected ear pad 15 is
performed. become.
[0071]
The processing operation for realizing the change setting of the filter characteristic of the NC
filter 5a including the reading of the ID information from the ear pad 15 will be described with
reference to the flowchart of FIG. In FIG. 10, the processing operation shown as a microcomputer
in the drawing is executed by the microcomputer 8 shown in FIG. 4 based on the program stored
in, for example, the aforementioned ROM. Further, the processing operation shown as a DSP is
executed by the DSP 5 based on a program stored in the memory 10.
[0072]
First, on the microcomputer 8 side, in step S101 in the drawing, the process waits until the pad is
connected. As described above, the connection / non-connection of the ear pad 15 can be
determined based on the ON / OFF signal from the pad connection / non-connection detection
unit 9 shown in FIG. 4.
[0073]
In response to the connection of the pad, in step S102, an ID reading process is performed. That
is, the ear pad 15 is determined based on the result of determining whether the electric signal
level in the line for each of the electrodes Eh (Eh1a, Eh2a, Eh3a, Eh4a, Eh5a) connected to the
microcomputer 8 is H / L. The information of the ID stored by the presence or absence of the
10-04-2019
24
conductive part Ep on the side is acquired.
[0074]
In the subsequent step S103, the acquired ID is instructed to the DSP 5. When the process of step
S103 is executed, the processing operation on the side of the microcomputer 8 shown in this
figure ends.
[0075]
On the DSP 5 side, at step S201 in the figure, the instruction of the ID from the microcomputer 8
side is made to stand by. Then, when there is an instruction of the ID, in step S202, processing of
setting the characteristic of the NC filter is executed based on the filter characteristic information
associated with the instructed ID. That is, in the ID-filter characteristic correspondence
information 9a, the process of setting the filter characteristic of the NC filter 5a is executed based
on the filter characteristic information associated with the information of the ID that matches the
instructed ID. When the process of step S202 is performed, the processing operation on the side
of the DSP 5 shown in FIG.
[0076]
Example 2 Subsequently, Example 2 will be described. In the following description, parts that are
the same as the parts already described above will be assigned the same reference numerals and
descriptions thereof will be omitted.
[0077]
In the second embodiment, the ID information is stored according to the presence or absence of
the convex portion at the predetermined position on the ear pad 15 side, and a mechanical
switch for detecting the presence or absence of the convex portion is provided on the headphone
1 side corresponding thereto. It is something to read. 11 (a) is a perspective view showing the
structure of the Lch housing portion 1L and the ear pad 15, and FIG. 11 (b) is on the headphone
1 side. It is the figure which showed typically about the wiring state inside with respect to each
10-04-2019
25
mechanical switch.
[0078]
First, in FIG. 11A, in the ear pad 15 in this case, the first convex portion forming position P11,
the second convex portion forming position P12, and the third convex with respect to the
predetermined position in the connection surface with the Lch housing portion 1L. A portion
forming position P13, a fourth convex portion forming position P14, and a fifth convex portion
forming position P15 are set, and ID information is stored depending on the presence or absence
of the convex portion J at each of the forming positions P11, P12, P13, P14, and P15. . In the
example of this figure, the case where the convex part J is formed in all the convex part
formation positions P is shown. The first convex portion forming position P11 is formed at the
first convex portion J1, the second convex portion forming position P12 is formed at the second
convex portion J2, and the third convex portion forming position P13 The fourth convex portion
J4 is formed at the third convex portion J3 and the fourth convex portion forming position P14,
and the fifth convex portion J5 is formed at the fifth convex portion forming position P15.
[0079]
On the other hand, on the Lch housing 1L side in this case, the first mechanical switch MSW1,
the second mechanical switch MSW2, the third mechanical switch MSW3, the fourth mechanical
switch MSW4, the fifth mechanical switch on the connection surface with the ear pad 15 MSW 5
is provided. The first mechanical switch MSW1 is provided at a position facing the first convex
portion forming position P11 when the ear pad 15 is positioned by the positioning portions Xh
and Xp. Similarly, the second mechanical switch MSW2 faces the second convex portion forming
position 12, the third mechanical switch MSW3 faces the third convex portion forming position
13, and the fourth mechanical switch MSW4 forms the fourth convex portion The fifth
mechanical switch MSW 5 is provided at a position facing the position 14 and a position facing
the fifth convex portion forming position 15. Further, each of the mechanical switches MSW1 to
MSW5 is pressed by the convex portion J to be in the ON state when the convex portion J is
formed at the opposing convex portion forming position P when the ear pad 15 is connected.
Further, when the convex portion J is not formed at the opposing convex portion forming
position P, or when the ear pad 15 is removed, it is formed to be in the OFF state.
[0080]
10-04-2019
26
Then, in the headphone 1 in this case, as shown in FIG. 11B, one terminal of each mechanical
switch MSW is grounded and the other terminal is a line to which a bias voltage at a
predetermined level is applied. It is connected to the microcomputer 8 via With such a
configuration, the structural pattern detection unit 11 for detecting the presence or absence of
the convex portion J at each convex portion forming position P on the ear pad 15 side is formed
by the electric signal. Specifically, when the protrusion J is formed at the convex portion forming
position P on the ear pad 15 side, the line connected to the corresponding mechanical switch
MSW becomes L, and the corresponding mechanism is not formed when the convex portion J is
not formed. The line connected to the switch MSW becomes H. The microcomputer 8 stores the
presence or absence of the convex portion J on the ear pad 15 side by determining the
distinction of H / L of the electric signal obtained by the line connected to each mechanical
switch MSW (the other terminal). ID information can be acquired.
[0081]
In addition, although the case where ID was memorize | stored by the presence or absence of the
convex part J was illustrated in FIG. 11, ID can also be memorize | stored by the presence or
absence of a recessed part. In that case, each mechanical switch MSW is provided, for example,
so as to protrude from the connection surface with the ear pad 15 in the Lch housing portion 1L,
and when the concave portion is formed thereby, the concave portion is not pressed by the
concave portion. Just do it. In other words, each mechanical switch MSW in this case is provided
so as to be pressed by the connection surface on the side of the ear pad 15 to be in the ON state
when the recess is not formed at the corresponding formation position P. Also in such a
configuration, the microcomputer 8 can acquire ID information by determining the H / L of the
electric signal obtained by the line connected to each mechanical switch MSW.
[0082]
Here, also in the second embodiment, processing for changing and setting the filter
characteristics of the NC filter 5a is performed according to the acquired ID information, but the
contents thereof are described in FIG. Since it becomes the same as in the above, the explanation
will be omitted.
[0083]
Third Embodiment In the third embodiment, ID information is stored and read according to the
10-04-2019
27
presence or absence of a light guide at a predetermined position on the ear pad 15 side.
12 (a) is a perspective view showing the structure of the Lch housing portion 1L and the ear pad
15, and FIG. 12 (b) is a side view of the headphone 1 side. It mainly extracts and shows the
internal configuration of the part related to reading of the ID information.
[0084]
In FIG. 12A, in the connection surface of the ear pad 15 in this case on the headphone 1 side, the
first light guide formation position P21, the second light guide formation position P22, and the
third light guide are provided at predetermined positions. The part formation position P23, the
fourth light guide formation position P24, and the fifth light guide formation position P25 are
set, and the ID information is determined depending on the presence or absence of the light
guide Op at each formation position P21, P22, P23, P24, P25. Is stored. As shown in the figure,
the first light guide portion Op1 is formed at the first light guide portion formation position P21,
and the second light guide portion Op2 is formed at the second light guide portion formation
position P22. The third light guiding portion Op3 is formed at the portion forming position P23,
and the fourth light guiding portion Op4 is formed at the fourth light guiding portion forming
position P24. The fifth light guiding portion forming position P25 is formed. Is the fifth light
guide portion Op5. Each of the light guide portions Op1, Op2, Op3, Op4, and Op5 has
transparency, and is made of, for example, transparent glass or transparent resin.
[0085]
On the other hand, on the headphone 1 side in this case, when the ear pad 15 is positioned and
connected, it is provided so as to face the first light guide portion forming position P21 [first
light emitting portion Oh-E1, the first And [1st light detection unit Oh-D1], and [2nd light
emission unit Oh-E2, second light detection unit Oh-D2] provided so as to face the second light
guide formation position P22 , And a pair of [third light emitting unit Oh-E3 and third light
detecting unit Oh-D3] provided so as to face the third light guiding portion forming position P23
and facing the fourth light guiding portion forming position P24 Of the fourth light emitting
section Oh-E4 and the fourth light detecting section Oh-D4], and the fifth light emitting section
facing the fifth light guide section forming position P25 A set of the section Oh-E5 and the fifth
light detection section Oh-D5] is provided. Each of the light emitting units Oh-E1, Oh-E2, Oh-E3,
Oh-E4 and Oh-E5 is configured to include a light emitting element such as a light emitting diode
(LED). Each of the light detection units Oh-D1, Oh-D2, Oh-D3, Oh-D4, and Oh-D5 includes, for
10-04-2019
28
example, a light detection element (photoelectric conversion element) such as a phototransistor.
[0086]
As shown in FIG. 12B, the light emitting units Oh-E1, Oh-E2, Oh-E3, Oh-E4 and Oh-E5 are
connected to the microcomputer 8. Further, each of the light detection units Oh-D1, Oh-D2, OhD3, Oh-D4 and Oh-D5 is also connected to the microcomputer 8. The microcomputer 8 in this
case performs ON / OFF control of the light emission operation of each of the light emitting units
Oh-E1, Oh-E2, Oh-E3, Oh-E4 and Oh-E5. Further, the level detection of the detection signal
(electric signal) from each of the light detection units Oh-D1, Oh-D2, Oh-D3, Oh-D4, and Oh-D5 is
performed.
[0087]
In this case, each light emitting unit Oh-E1, Oh-E2, Oh-E3, Oh-E4, Oh-E5, and each light detection
unit Oh-D1, Oh-D2, Oh-D3, Oh-D4, Oh-D5. Functions as the structural pattern detection unit 11.
That is, it functions as a part which detects the presence or absence of the light guide part Op in
each light guide part formation position P in the ear pad 15 side by an electric signal. When the
light guiding part Op is formed at the light guiding part forming position P on the ear pad 15
side, the light guiding part Op is lighted by the light emitted by the corresponding light emitting
part Oh-E, and the lighting light corresponds It is detected by the light detection unit Oh-D. That
is, the detection signal by the corresponding light detection unit Oh-D becomes H. On the other
hand, when the light guide portion Op is not formed at the light guide portion formation position
P, the detection signal by the corresponding light detection portion Oh-D is L because there is no
lighting portion. In this manner, the microcomputer 8 obtains the ID information stored
depending on the presence or absence of the light guiding portion Op on the ear pad 15 side by
determining the distinction of H / L of the detection signal by each light detection portion Oh-D.
be able to.
[0088]
In addition, although the case where both the light emission part Oh-E and the light detection
part Oh-D were provided with respect to the position facing each light guide part formation
position P was illustrated as an example in this FIG. 12, the light emission part Oh-E For each of
the light guide forming positions P, it is not always necessary to provide one each. For example,
10-04-2019
29
only one light emitting unit Oh-E common to each light guide forming position P can be provided.
[0089]
Further, in the example of FIG. 12, for example, transparent glass or transparent resin is provided
as the light guiding part Op, but as the light guiding part Op, for example, a mirror-like member
that reflects light from the light emitting part Oh-E. Can also be used. In this case, it is not
necessary to have a structure in which the depth is provided in the light incident direction as
shown in FIG. 12 as the light guide portion Op, and for example, a thin plate like the conductive
portion Ep in FIG. It may be in the form of a loop, which may be attached to a predetermined
position. It should be noted that, for the purpose of confirmation, “light guiding” in this case is
used in the sense of guiding the light emitted by the light emitting unit Oh-E to the light detecting
unit Oh-D. It is.
[0090]
Further, in the example of FIG. 12, the light guiding part Op is exposed on the entire surface of
the formation position P, but as shown in FIG. 13 below, for example, light from the light emitting
part Eh-E is input. The input unit and the light output unit for outputting the light to the light
detection unit Oh-D may be divided and exposed separately. Although the structure of the light
guide portion Op in this case is shown as a representative of the structure of the first light guide
portion Op1 in FIG. 13B, two convex portions are formed in each light guide portion Op in this
case. These two convex portions are exposed on the connection surface to function as a light
input portion and a light output portion, respectively. As shown in FIGS. 13A and 13B, the first
light input portion Op1a and the first light output portion Op1b are formed in the first light
guide portion Op1. Similarly, as shown in FIG. 13A, the second light guide portion Op2 is formed
of the second light input portion Op2a, the second light output portion Op2b, and the third light
guide portion Op3. The third light input portion Op3a and the third light output portion Op3b,
and the fourth light guide portion Op4 are formed at the fourth light input portion Op4a and the
fourth light output portion Op4b, and the fifth light guide portion Op5. The fifth light input unit
Op5a and the fifth light output unit Op5b are formed. It should be noted that, for the purpose of
confirmation, on the headphone 1 side in this case, when the ear pad 15 is connected, each light
emitting portion Eh-E is formed with the light input portion of the corresponding light guiding
portion Op. It is provided for the position that should be and the opposite position. Similarly, the
light detection unit Oh-D is provided at a position opposite to the position where the light output
unit of the corresponding light guide unit Op is to be formed.
10-04-2019
30
[0091]
Here, also in the third embodiment, processing for changing and setting the filter characteristic
of the NC filter 5a is performed according to the acquired ID information. The flowchart in FIG.
14 shows the contents of the filter characteristic change setting process to be executed in the
third embodiment. As can be seen by comparing FIG. 14 with the previous FIG. 10, the
microcomputer in this case As the process on the side 8, first, when the pad is connected in step
S 101, a process for turning on each light emitting unit Oh-E is performed in step S 301. Then, in
the subsequent step S302, as an ID reading process, a process of acquiring ID information from
the result of the determination of H / L of the detection signal by each light detection unit Oh-D
is executed, and further in the next step S303. A process is performed to turn off each light
emitting unit Oh-E. The subsequent processing on the microcomputer 8 side and the processing
on the DSP 5 side are the same as those described with reference to FIG. 10, and thus the
description thereof will be omitted. doing).
[0092]
Fourth Embodiment Here, the description has been made of the case where different information
is stored for each type of ear pad 15 according to the physical structural pattern formed on the
ear pad 15 side. Information stored in each ear pad 15 is stored by a memory device provided on
the side.
[0093]
FIG. 15 is a view for explaining the configuration of the fourth embodiment, and FIG. 15 (a) is a
perspective view showing the structure of the Lch housing portion 1L and the ear pad 15. FIG.
15 (b) is a headphone 1 in this case. The internal configuration on the side and the internal
configuration on the ear pad 15 side are shown.
In FIG. 15B, the internal configuration on the headphone 1 side is mainly shown by extracting the
configuration of a portion related to reading of information stored on the ear pad 15 side.
[0094]
10-04-2019
31
First, in FIG. 15A, the ear pad 15 in this case has a power input terminal Tp-E, a ground terminal
Tp-GND, and a data communication terminal Tp-D at a predetermined position on the connection
surface with the headphone 1 side. Provided. On the other hand, in the Lch housing portion 1L in
this case, a power supply terminal Th- provided so as to be in contact with the power input
terminal Tp-E when the ear pad 15 is connected on the connection surface with the ear pad 15.
E, a ground terminal Th-E provided in contact with the ground terminal Tp-GND, and a ground
terminal Th-GND provided in contact with the data communication terminal Tp-D are provided.
[0095]
As shown in FIG. 15B, the non-volatile memory 16 is provided in the ear pad 15 in this case. The
power input terminal Tp-E, the ground terminal Tp-GND, and the data communication terminal
Tp-D are connected to the nonvolatile memory 16, respectively. On the other hand, the power
supply unit 12 is provided on the headphone 1 side, and the power supply terminal Th-E and the
ground terminal Th-GND described above are connected to the power supply unit 12. Further,
the data communication terminal Th-D is connected to the microcomputer 8. With such a
configuration, when the ear pad 15 is connected to the Lch housing unit 1L, power is supplied
from the power supply unit 12 to the non-volatile memory 16, and the data communication
terminals Th-D and Tp-D are It is possible to read data from the non-volatile memory 16 via the
interface.
[0096]
In the fourth embodiment, the non-volatile memory 16 is provided on the ear pad 15 side in this
manner, and data can be read from the non-volatile memory 16 on the headphone 1 side. Instead
of the ID information, the filter characteristic information is directly stored. That is, as shown in
FIG. 15B, the nonvolatile memory 16 stores filter characteristic information 16a for realizing the
filter characteristic to be set corresponding to the ear pad 15. It is.
[0097]
Here, in the case of storing the ID information as in each of the embodiments described above, in
the headphone 1, the ID-filter characteristic correspondence information 10a representing the
correspondence between the ID information and the filter characteristic information is essential. .
10-04-2019
32
When storing the ID information in this manner, when the ear pad 15 connected to the
headphone 1 is not compliant, that is, the ID information and filter characteristic information
corresponding to the ear pad 15 connected to the headphone 1 are stored. If not, it is not
possible to obtain an appropriate noise canceling effect, or it is necessary to add ID information
and filter characteristic information. On the other hand, in the case where the filter characteristic
information is directly stored on the ear pad 15 side as described above as the fourth
embodiment, the NC on the headphone 1 side is directly NC based on the read filter
characteristic information. Since the filter characteristic of the filter 5a can be set, the occurrence
of such a problem can be effectively prevented.
[0098]
For confirmation, the internal configuration of the headphone 1 as the fourth embodiment is
shown in the following FIG. As shown in FIG. 16, in the headphone 1 in this case, the ID-filter
characteristic correspondence information 10a stored in the memory 10 in the case of FIG. 4 is
omitted. The power supply unit 12, the power supply terminal Th-E, the ground terminal Th-GND,
and the data communication terminal Th-D shown in FIG. 15 (b) are also shown in FIG.
[0099]
FIG. 17 is a flow chart showing filter characteristic change setting processing in the fourth
embodiment. In FIG. 17, the processing operation shown as a microcomputer in the drawing is
executed by the microcomputer 8 shown in FIG. 16 based on a program stored in, for example, a
ROM provided by itself. Further, the processing operation shown as a DSP is executed by the DSP
5 shown in FIG. 16 based on the program stored in the memory 10. Also in this figure, the same
step numbers are assigned to processes that are similar to the processes already described.
[0100]
In FIG. 17, as the processing operation on the microcomputer 8 side in this case, first, the
process waits until the pad is connected in step S101, and in response to the connection of the
pad, reading of the filter characteristic information in step S401. Execute the process That is, the
filter characteristic information 16a stored in the non-volatile memory 16 on the ear pad 15 side
is read and acquired. Then, in the subsequent step S402, the read filter characteristic information
is transferred to the DSP 5. When the process of step S402 is executed, the processing operation
10-04-2019
33
on the side of the microcomputer 8 shown in this figure ends.
[0101]
On the DSP 5 side, in the process of step S501, the process waits until the filter characteristic
information is transferred from the microcomputer 8 side. Then, when the filter characteristic
information is transferred, in step S502, a process of setting the characteristic of the NC filter 5a
is executed based on the transferred filter characteristic information. When the process of step
S502 is performed, the processing operation on the side of the DSP 5 shown in FIG.
[0102]
[Summary] As described above, according to the present embodiment, the filter characteristic of
the NC filter 5a to be set corresponding to the ear pad 15 is made variable according to the type
of the ear pad 15 to be connected. It can be set to As a result, as an acoustic reproduction system
having a noise canceling function, it is possible to realize an excellent system in which the used
ear pad 15 can be freely changed.
[0103]
And according to this embodiment, the variable setting of the filter characteristic according to
the ear pad 15 to be used can be automatically performed based on the information stored in the
ear pad 15 side. This can realize a highly convenient system in which the user's operation burden
is reduced, for example, as compared with the case of selecting another of the ear pads 15 to be
used based on the user's operation. At the same time, it is effective to select an ear pad 15
different from the ear pad 15 actually used due to the user's misunderstanding, etc., and to
prevent the proper noise canceling effect from being obtained. It can be prevented.
[0104]
[Modifications] Although the embodiments of the present invention have been described above,
the present invention should not be limited to the specific examples described above. In the
above description, the reading of the information stored in the ear pad 15 and the change setting
10-04-2019
34
of the filter characteristic are performed in response to the case where the signal processing unit
performing the filter processing as the NC filter 5a is provided to the headphone device. In the
illustrated example, the configuration for the headphone device is provided. However, the
present invention can be suitably applied to the case where the signal processing unit that
performs the filtering process is not provided in the headphone device but in the signal
processing device such as an audio player that supplies the audio signal to the headphone device.
. Hereinafter, the configuration of the sound reproduction system configured by including the
signal processing device including the signal processing unit and the headphone device in this
way will be described as each modification corresponding to each of the embodiments described
above. Do. In each modification, the configuration of the ear pad 15 may be the same as that
described in each of the embodiments, and thus the description thereof will be omitted.
[0105]
FIG. 18 is a diagram showing a sound reproduction system configuration as a modification of the
first embodiment, which corresponds to the case of adopting the method of the first embodiment.
In the following description, parts that are the same as the parts already described will be
assigned the same reference numerals and descriptions thereof will be omitted. First, in this case,
the audio reproduction system is configured to include an audio player 20 for reproducing audio
data and a headphone 30. The audio player 20 has the configuration for noise canceling
provided on the side of the headphones 1 described in each embodiment, that is, the microphone
amplifier 2, the A / D converter 3, the DSP 5, the D / A converter 6, the power An amplifier 7 and
a memory 10 are provided. Further, a microphone input terminal TMin for inputting a sound
collection signal to be supplied to the microphone amplifier 2 and an audio output terminal
TAout for outputting an audio signal output from the power amplifier 2 are provided. On the
other hand, the headphone 30 is provided with a microphone MIC and a driver DRV, and is
connected to the microphone MIC and a microphone output terminal TMout for supplying a
collected signal to the audio player 20 and a driver DRV. Above, the audio input terminal Tin
which receives supply of the audio signal from the said audio output terminal TAout by the side
of the audio player 20 is provided.
[0106]
In addition, the headphone 30 is provided with a pad connection detection unit 9. In this case,
the ON / OFF signal from the pad connection detection unit 9 is supplied to the audio player 20
side. For this reason, the headphone 30 is provided with a terminal Th-c connected to the pad
connection / non-connection detection unit 9. Further, in the headphone 30 in this case, an
10-04-2019
35
electrode Eha and an electrode Ehb are provided as a configuration corresponding to the first
embodiment. Here, the number of the electrodes Eh (that is, the number of the conductive
portions Ep) is not limited, and only one set is representatively shown. In this case, the line
connected to the electrode Eha is connected to the relay terminal Th-Ma, and the line connected
to the electrode Ehb is connected to the relay terminal Th-Mb.
[0107]
The configuration of the audio player 20 will be specifically described. In the audio player 20, in
addition to the configuration for noise cancellation and the terminals TMin and TAout described
above, the storage unit 21, the reproduction processing unit 22, the external communication
interface 23, the display unit 24, and the system controller 25 as illustrated. Be equipped. The
collected sound signal input through the above-described microphone input terminal TMin is
supplied to the DSP 5 through the microphone amplifier 2 → A / D converter 3. Also in this case,
the DSP 5 performs, as the NC filter 5a in the drawing, a filtering process for noise canceling on
the sound collection signal (sound collection data) supplied in this way. Also, the DSP 5 inputs
audio data to be reproduced as described later, and performs equalizing processing on the audio
data by the functional operation as the equalizer 5 b. Further, the DSP 5 adds the audio data
subjected to the equalizing processing and the collected sound data subjected to the filter
processing for the above noise cancellation by the functional operation as the adder 5 c in the
figure, and the addition obtained as a result The data is supplied to the D / A converter 6. The
addition data is supplied to the above-mentioned audio output terminal TAout via the D / A
converter 6 → power amplifier 7.
[0108]
The storage unit 21 is used to store various data including audio data. As a specific configuration,
for example, writing (recording) / reading of data to a solid-state memory such as a flash memory
may be performed, or it may be configured by, for example, an HDD (Hard Disk Drive). In
addition, a recording medium having portability, not a built-in recording medium, for example, a
memory card incorporating a solid-state memory, an optical disc such as a CD (Compact Disc) or
a DVD (Digital Versatile Disc), a recording medium such as a magnetooptical disc or a hologram
memory It can also be configured as a drive device corresponding to Of course, both a built-in
type memory such as a solid state memory and an HDD, and a drive device for a portable
recording medium may be mounted. The storage unit 21 writes / reads out audio data and
various other data based on the control of the system controller 25.
10-04-2019
36
[0109]
Here, it is assumed that audio data is stored in the storage unit 21 in a state of being
compression-encoded by a predetermined audio compression encoding method. The compressed
audio data read by the storage unit 21 is supplied to the reproduction processing unit 22. The
reproduction processing unit 22 performs predetermined reproduction processing (decoding
processing) such as decompression processing on the supplied compressed audio data under the
control of the system controller 25. The audio data reproduced by the reproduction processing
unit 22 is supplied to the DSP 5 (equalizer 5 b).
[0110]
The system controller 25 is configured by a microcomputer including, for example, a ROM, a
RAM, a CPU, etc., and performs various control processes and operations based on programs
stored in the storage means such as the ROM or the memory 10, for example. The overall control
of the audio player 20 is performed. For example, data write / read control to the storage unit 21
is performed. In addition, the storage unit 21 and the reproduction processing unit 22 are
controlled to perform reproduction start / stop control of audio data.
[0111]
The system controller 25 also performs a process of determining (determining) whether the ear
pad 15 is connected to the headphone 30 based on the ON / OFF signal of the pad connection
detection unit 9 provided in the headphone 30. As illustrated, the system controller 25 is
connected to a terminal Ts-c. The terminal Ts-c is provided in contact with the above-mentioned
terminal Th-c on the headphone 30 side when the audio player 20 and the headphone 30 are
connected. As a result, the system controller 25 is supplied with an ON / OFF signal from the pad
connection detection unit 9 provided in the headphone 30.
[0112]
Also, an external communication interface 23 is connected to the system controller 25. The
external communication interface 23 is a communication interface unit configured to perform
10-04-2019
37
data communication with an external device according to a required data communication method
such as USB (Universal Serial Bus) method, for example, based on an instruction of the system
controller 25. Data communication is performed with an external device (for example, an
information processing apparatus such as a personal computer) connected via a terminal TI / F
illustrated. The system controller 25 records transfer data from an external device obtained
through the external communication interface 23 in the storage unit 21 or the memory 10.
Thereby, audio data stored in an external device such as a personal computer is recorded in the
storage unit 21 or the like, or data such as an upload program for the audio player 20 which the
personal computer downloaded from the network is stored in the memory 10 or the like. It is
possible to record.
[0113]
Further, the display unit 24 is connected to the system controller 25. The display unit 24 is, for
example, a display device such as a liquid crystal display or an organic EL display, and displays
required information in accordance with an instruction from the system controller 25.
[0114]
Also, the audio player 20 is provided to be in contact with the relay terminal Ts-Ma and the relay
terminal Th-Mb provided so as to be in contact with the above-described relay terminal Th-Ma
when connected to the headphones 30. The relay terminal Ts-Mb is provided. As shown, the relay
terminal Ts-Mb is grounded and the relay terminal Th-Ma is connected to the system controller
25 via a line to which a bias voltage at a predetermined level is applied.
[0115]
Here, in the sound reproduction system in this case, a portion surrounded by an alternate long
and short dash line in the figure (electrodes Eha and Ehb, relay terminals Th-Ma and Th-Mb,
relay terminals Ts-Ma and Ts-Mb, earth line, And, the circuit unit that applies a bias voltage to
the relay terminal Th-Ma functions as a structural pattern detection unit. That is, in this case, the
structural pattern detection unit is formed across the headphones 30 and the audio player 20.
[0116]
10-04-2019
38
In this modification, although the system controller 25 performs the filter property change
setting process including the reading of the ID information stored in the ear pad 15, the process
contents will be described with reference to FIG. It should be the same as Also, the processing on
the DSP 5 side may be the same as that described in FIG.
[0117]
Alternatively, in the case of such a modification, since it is possible to perform information
display using the display unit 24 provided on the audio player 20 side, the connected ear pad 15
is not a compatible product. Alternatively, a notification to that effect may be issued, or download
of new ID information / filter characteristic information may be prompted.
[0118]
FIG. 19 is a flowchart showing the processing operation to be executed in response to such noncorrespondence notification.
The processing operation shown in this figure is executed by the system controller 25 shown in
FIG. 18 based on the program stored in, for example, the aforementioned ROM. Although only
the process on the system controller 25 side is shown in this figure, the process content on the
DSP 5 side is the same as that described in FIG. Also in this figure, the same step numbers are
assigned to processes having the same contents as the processes already described.
[0119]
First, the system controller 25 executes a process of waiting until the pad is connected in step
S101. In order to confirm, in this case, the presence or absence of connection of the ear pad 15 is
determined based on the signal from the pad connection presence / absence detection unit 9
provided on the headphone 30. If the pad is connected in step S101, the process of reading the
ID is performed in step S102, and then in step S601, a determination process is performed as to
whether or not there is an ID matching the correspondence information. That is, in the ID-filter
characteristic correspondence information 10a stored in the memory 10, it is determined
whether or not there is an ID that matches the ID read in step S102. In this step S601, when a
negative result is obtained because there is no ID that matches the correspondence information,
10-04-2019
39
the process proceeds to step S602 to execute non-correspondence notification processing. That
is, the display unit 24 performs information display indicating that the ear pad 15 connected to
the headphone 30 is not supported. Alternatively, the ID information / filter to be added to the
ID-filter characteristic correspondence information 10a by connecting to an external information
processing apparatus which can be connected to a network, such as a personal computer,
together with the information indicating that it is not supported in this way Display information
for instructing download of characteristic information. On the other hand, if an affirmative result
is obtained because there is an ID matching the correspondence information in step S601, the
process proceeds to step S603 to instruct the DSP 5 on the ID. When the process of step S602 or
step S603 is executed, the processing operation of the system controller 25 shown in this figure
is ended.
[0120]
FIG. 20 shows a system configuration of a modified example corresponding to the case of
adopting the method of the second embodiment. As understood from comparison with FIG. 18
described above, in this case, mechanical switches MSW are provided instead of the electrodes
Eha and Ehb provided on the headphone 30 side. Specifically, one terminal of the mechanical
switch MSW is connected to the relay terminal Th-Ma, and the other terminal is connected to the
relay terminal Th-Mb. Also in this case, a portion (mechanic switch MSW, relay terminals Th-Ma,
Th-Mb, relay terminals Ts-Ma, Ts-Mb, earth line, and relay terminal Th-Ma) is surrounded by the
dashed dotted line in the figure. A circuit unit that applies a voltage functions as a structural
pattern detection unit.
[0121]
In the case of the modification corresponding to the second embodiment, the change setting of
the filter characteristic according to the ID information may be performed by the same process
as that shown in FIG. Alternatively, non-correspondence notification can be made possible by the
processing operation shown in FIG.
[0122]
FIG. 21 shows a system configuration of a modified example corresponding to the case of
adopting the method of the third embodiment. In this case, the light emitting unit Oh-E is
10-04-2019
40
connected to the relay terminal Th-Ma in the headphone 30, and the light detection unit Oh-D is
connected to the relay terminal Th-Mb, as compared with the configuration of FIG. The point to
be Further, on the audio player 20 side, the bias voltage for the line of the relay terminal Ts-Ma is
omitted, and the relay terminal Ts-Mb is connected to the system controller 25. In this case, the
light emitting unit Oh-E and the light detection unit Oh-D function as a structural pattern
detection unit, as surrounded by a dashed dotted line in the drawing.
[0123]
In the case of the modification corresponding to the third embodiment, the change setting of the
filter characteristic according to the ID information may be performed by the same process as
that shown in FIG. Alternatively, non-correspondence notification can be enabled by
incorporating the processing of steps S601 and S602 shown in FIG. 19 into the processing
operation shown in FIG.
[0124]
FIG. 22 shows a system configuration of a modified example corresponding to the case of
adopting the method of the fourth embodiment. First, in this case, on the audio player 20 side, a
power supply unit 26 for supplying power to the non-volatile memory 16 provided in the ear pad
15 is provided. Further, in this case, the ID-filter characteristic correspondence information 10a
in the memory 10 is omitted.
[0125]
Furthermore, in the sound reproduction system in this case, the structural pattern detection unit
as shown in FIGS. 18, 20, and 21 is not provided, and the audio player 20 is connected to the
power supply unit 26 on the audio player 20 side. A power supply terminal Ts-E, a ground
terminal Ts-GND, and a data communication terminal Ts-D connected to the system controller 25
are provided. Further, on the headphone 30 side, the relay terminal ThM-E provided so as to be
in contact with the power supply terminal Ts-E when connected to the audio player 20 and the
ground terminal Ts-GND A relay terminal ThM-GND is provided, and a relay terminal ThM-D
provided in contact with the data communication terminal Ts-D is provided. Further, when the
ear pad 15 as the fourth embodiment is connected to the headphone 30, the electric power input
terminal Tp-E, the ground terminal Tp-GND, and the data communication terminal Tp-D formed
10-04-2019
41
in the ear pad 15 are in contact with each other. The power supply terminal Th-E, the ground
terminal Th-GND, and the data communication terminal Th-D similar to those described in FIG.
15A are provided.
[0126]
With such a configuration, when the ear pad 15 is connected to the headphone 30 connected to
the audio player 20, the system controller 25 reads out the filter characteristic information 16a
stored in the non-volatile memory 16 in the ear pad 15. Being able to do that.
[0127]
In the case of the configuration of the modification corresponding to the modification 4, the
system controller 25 and the DSP 5 may execute the same processing operation as that described
in FIG.
It should be noted for confirmation that, in this case, the filter characteristic information 16a is
stored on the side of the ear pad 15, so the processing for the non-correspondence notification is
not particularly necessary.
[0128]
In the above description, the operation when the ear pad 15 is removed is not particularly
mentioned, but when it is detected that the ear pad 15 is removed, the audio is being reproduced,
audio It is also possible to pause the reproduction on the player 20 side.
[0129]
Further, when the ear pad 15 is connected, the change setting of the filter characteristic is
performed, so that the reproduction can be paused during that time.
That is, in this case, the system controller 25 controls the storage unit 21 and the reproduction
processing unit 22 according to the pad connection to temporarily stop the reproduction, and
then executes the filter characteristic change setting process described in each embodiment. .
Then, in response to the notification of the filter characteristic setting completion from the DSP
10-04-2019
42
5, the reproduction is resumed.
[0130]
In addition, although the configuration for reading information has been exemplified in the Lch
housing unit 1L throughout the entire description so far, the configuration for reading
information may be provided on the Rch housing unit 1R side. . Alternatively, a configuration for
reading information can be provided on both the Lch side and the Rch side. When both are
provided, the amount of information that can be stored on the ear pad 15 side can be further
increased.
[0131]
Moreover, in Examples 1 to 3 (and their modifications), the case where the formation position P
is set to five places at the maximum is illustrated, but the number of setting the formation
positions P is not particularly limited.
[0132]
Here, if the set number of formation positions P is increased, it is possible to store information by
a larger number of bits.
When the formation position P is thus increased, not only information representing the type
(model) of the ear pad 15 but also information for identifying the characteristic variation of the
individual ear pad 15 is included as ID information. You can also As a specific example, for
example, the lower few bits store information indicating the type of the ear pad 15 and the upper
few bits store information indicating the individual characteristics of the ear pad 15 belonging to
the model. It is. Here, specific examples of the characteristics of the individual ear pads 15
include sound leakage characteristics, sound insulation characteristics from the outside, the
above-described frequency gain characteristics, and the like. For example, divisions of several
types are roughly defined for these characteristics. These characteristics of the ear pad 15 are
measured at a required timing before shipment from the factory, and the individual
characteristics of the ear pad 15 are classified into which division each characteristic belongs. In
each ear pad 15 in this case, information including information of each section of each
characteristic based on the measurement result is stored as ID information together with other
information of the model as a physical structure pattern. On the headphone 1 side or the audio
10-04-2019
43
player 20 side, ID information for identifying the ID-filter characteristic correspondence
information 10a including the classification for each characteristic as well as the classification as
described above and the ID information thereof Information associated with information of filter
characteristics to be set correspondingly is stored. Also in this case, the process of changing and
setting the filter characteristic of the NC filter 5a based on the acquired ID information may be
similar to that described in the first to third embodiments. By doing this, it is possible to change
and set the filter characteristics in consideration of variations among the individual ear pads 15
of the same model.
[0133]
Alternatively, the ID information may be information including another frequency characteristic
(frequency-amplitude characteristic) of each individual of the ear pad 15. At this time, gain
adjustment may be performed on the side of the headphone 1 or the audio player 20 according
to other information of the frequency characteristic. Such gain adjustment (correction) can be
realized by either digital gain adjustment in the DSP 5 or analog gain adjustment for an analog
signal.
[0134]
Also in the fourth embodiment, similarly, not only the filter characteristic information 16a, but
also information on another of these various characteristics can be stored. Alternatively, the
correction value itself to be set according to the characteristic can be directly stored.
[0135]
In the fourth embodiment, the filter characteristic information 16a is stored in the non-volatile
memory 16. However, as in the other embodiments, the ID information may be stored.
[0136]
Further, in the first to third embodiments, the case where the positioning portion X is provided
by the ear pad 15 and the headphone 1 (or 30) has been exemplified, but the positioning portion
X is not appropriately required by devising the arrangement of the formation positions P. It can
be done.
10-04-2019
44
For example, in each of the first to third embodiments, if the formation positions P are formed in
an independent ring shape, the positioning portion X can be made particularly unnecessary. Also
in the fourth embodiment, similarly, for example, if the power input terminal Tp-E, the ground
terminal Tp-GND, and the data communication terminal Tp-D are respectively formed in an
independent ring shape, the positioning portion X can be made unnecessary. it can.
[0137]
Moreover, although the case where the filter (NC filter) which gives the signal characteristic for
noise canceling was comprised with a digital filter was illustrated in the above description, NC
filter can also be comprised with an analog filter.
[0138]
In the above description, the filter characteristic for noise canceling is changed based on the
information stored in the ear pad side, but the equalizing characteristic (filter characteristic) in
the equalizer 5 b based on the ear pad side stored information Can be changed.
Alternatively, in addition to the equalizing characteristic, for example, the characteristic of the
filter that gives various acoustic effects such as a reverberation effect can be variably set. By
doing this, it is possible to realize a system capable of providing various kinds of acoustic effects
optimum for the ear pads to be used even in sound reproduction systems other than the noise
canceling system.
[0139]
Also, in the above description, the signal processing apparatus of the present invention is
exemplified as an audio player, but as the signal processing apparatus of the present invention,
for example, a portable telephone having a noise canceling function, etc. It can also be
implemented as an apparatus form.
[0140]
It is a figure showing an example model about a noise canceling system of a headphone device by
10-04-2019
45
a feedback method.
It is a Bode diagram showing the characteristic about the noise canceling system shown in FIG. It
is a figure showing an example model about a noise canceling system of a headphone device by a
feedforward method. It is the block diagram which showed the internal structure of the
headphone apparatus of Examples 1-3. It is a figure for demonstrating the kind of contact part
(ear pad) which the headphone apparatus of embodiment respond | corresponds. It is a figure for
demonstrating the arrangement | positioning relationship of the driver (speaker) and microphone
which the headphone apparatus of embodiment has. It is the figure shown about the data
structure of ID-filter characteristic corresponding information. FIG. 2 is a diagram for describing
a configuration as a first embodiment. FIG. 8 is a diagram for describing another example of the
first embodiment. It is the flowchart shown about the processing operation which should be
performed in order to realize operation as Example 1. FIG. 7 is a diagram for describing a
configuration of a second embodiment. FIG. 13 is a diagram for describing a configuration of a
third embodiment. FIG. 18 is a diagram for describing another example of the third embodiment.
FIG. 16 is a flowchart showing processing operations to be performed to realize the operation as
the third embodiment; FIG. FIG. 18 is a diagram for describing a configuration of a fourth
embodiment. FIG. 18 is a diagram showing an internal configuration of a headphone device in
the case of Example 4; FIG. 16 is a flowchart showing a processing operation to be performed to
realize the operation according to the fourth embodiment. FIG. 7 is a diagram showing a
configuration of a modification of the first embodiment. It is the flowchart shown about the
processing operation for realizing the non-correspondence notification. FIG. 10 is a diagram
showing a configuration of a modification of the second embodiment. FIG. 14 is a diagram
showing a configuration of a modification of the third embodiment. FIG. 18 is a diagram showing
a configuration of a modification of the fourth embodiment.
Explanation of sign
[0141]
1, 30 headphones, 1 L Lch housing part, 1 R Rch housing part, 2 microphone amplifiers, 3, 4 A /
D converters, 5 DSPs, 5a NC filters, 5b equalizers, 5c adders, 6 D / A converters, 7 Power
amplifier, 8 microcomputer, 9 pad connection detection unit, 10 memory, 10a ID-filter
characteristic correspondence information, 11 structure pattern detection unit, 12, 26 power
supply unit, 15 ear pad, Eh1a to Eh5a, Eh1b to Eh5b electrode, P1 -P5 1st-5th conductive part
formation position, Ep 1-5 Ep5-1st conductive part, MSW 1-MSW 5 mechanical switch, P 11-P
15 1st-5th convex part formation position, J 1-J 5 1st-5th Convex part, Oh-E1 to Oh-E5 first to
fifth light emitting parts, Oh-D1 to Oh-D5 first to fifth light detecting parts, P21 to P25 first to
fifth light guide forming positions Op1 to Op5 First to fifth light guiding units, Th-E power supply
10-04-2019
46
terminals, Th-GND, Tp-GND ground terminals, Th-D, Tp-D data communication terminals, Xh1 to
Xh3 positioning convex portions, Xp1 to Xp3 Positioning recess, 20 audio player, 21 storage
unit, 22 reproduction processing unit, 23 external communication interface, 24 display unit, 25
system controller
10-04-2019
47
Документ
Категория
Без категории
Просмотров
0
Размер файла
75 Кб
Теги
description, jp2009212772
1/--страниц
Пожаловаться на содержимое документа