close

Вход

Забыли?

вход по аккаунту

?

JP2010183451

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 JP2010183451
The present invention provides a signal processing device, a signal processing method, and a
program capable of providing surrounding sound while reducing discomfort and annoyance
caused by preventing listening to sound such as music. A signal processing device includes an
audio signal acquisition unit for acquiring audio signals SL and SR, an external signal acquisition
unit for acquiring external signals ML and MR, and an output signal OL from audio signals and
external signals. It has an output signal generation unit 100 capable of generating an OR, a mode
setting unit 25 capable of setting an external mode as an operation mode, and a fade control unit
26 controlling an output signal generation unit according to the operation mode The control unit
generates an output signal for at least one of the right ear and the left ear of the user U from at
least the external signal and outputs at least a voice for the other to the output signal generation
unit in the external mode. It is generated from the signal. [Selected figure] Figure 5
Signal processing apparatus, signal processing method and program
[0001]
The present invention relates to a signal processing device, a signal processing method, and a
program.
[0002]
BACKGROUND In recent years, various portable music players including mobile phones are
widely spread, and many people use headphones, earphones, etc. inside and outside of trains,
public and so on.
09-05-2019
1
Although the volume of the sound emitted from the headphones etc. is set to a volume suitable
for each listener, in many cases the purpose is to listen to music, and is subjectively sufficiently
large relative to ambient noise Often set to volume.
[0003]
For example, when trying to do some shopping while listening to music, it may be difficult to
hear the voice of a store clerk or the like while watching music. In addition, there are many cases
where it is necessary to listen to surrounding sounds while using music etc.
[0004]
In such a case, the user temporarily lowers the volume of music, stops the playback of music, etc.,
removes the headphones from the head, In many cases, the headphone is removed by removing
only one ear.
[0005]
JP 2007-281916 A
[0006]
As one of the situations where it is often necessary to take actions such as removing headphones
etc. in this way, there is a case where a call is made with a mobile phone.
On the other hand, Patent Document 1 is usually used for listening to music, etc., but the handset
of the mobile phone is used by using one of the speakers as a microphone and the other as the
other to listen to the other's voice. An earphone microphone is also described which works as
well.
[0007]
According to the earphone microphone described in Patent Document 1, although it is possible to
make a telephone call of the mobile phone without removing the earphone microphone, when it
09-05-2019
2
is desired to listen to surrounding sounds under other circumstances, , It is difficult to watch the
sound around it.
[0008]
For calls on mobile phones, users often tend to focus on the conversation.
Therefore, there are not a few users who are willing to remove headphones and the like.
[0009]
On the other hand, conversations in shopping etc. are often completed in a short time, and in
many cases it is sufficient if the user's importance is low or a certain level of awareness can be
secured and the conversation contents can be grasped.
And in such a case, "I do not want to interrupt listening", "It takes time to turn down the volume",
"I hate that I can not listen to vocals when only one ear is removed", "The player 鞄There are
users who think that it's bothersome to operate them, but they don't want to be able to listen to
them without headphones. Therefore, it is a fact that many users may feel sick by interrupting
the listening of music or the like due to the surrounding sound, or may feel uncomfortable with
an act of removing headphones or the like.
[0010]
Further, in the earphone microphone described in Patent Document 1, in any case, both
microphones are used for a call, and listening of music or the like has to be interrupted. On the
other hand, for example, not only in a call in a mobile phone but also in other situations, it is also
referred to as volume (volume or volume level. You can not but stop listening to music by
lowering the), stopping the playback, or removing the headphones. On the other hand, in the case
of performing the action of removing only one ear of the headphones, for example, if the music
etc. is a stereo sound, the difference between the left and right audio signals may be large and it
is not possible to listen to the removed audio. Even if listening to music etc. is not interrupted, it
will be halved.
09-05-2019
3
[0011]
Such ambient sounds are in fact more difficult to hear, especially when using a player or
headphones with noise canceling function, which has been spreading rapidly recently.
[0012]
Therefore, the present invention has been made in view of the above problems, and an object of
the present invention is to provide surrounding sounds while reducing discomfort and annoyance
caused by preventing listening to sounds such as music. It is an object of the present invention to
provide a new and improved signal processing device, signal processing method and program
that can be performed.
[0013]
In order to solve the above problems, according to one aspect of the present invention, an audio
signal acquisition unit for acquiring an audio signal representing stereo audio content, and an
external signal representing an external sound obtained by collecting surrounding sound An
output signal representing stereo audio provided to the user from the external signal acquisition
unit acquiring the audio signal, the audio signal acquired by the audio signal acquisition unit, and
the external signal acquired by the external signal acquisition unit An output signal generation
unit; a mode setting unit capable of setting an external mode corresponding to the output signal
to be generated at least as an operation mode of the output signal generation unit; and an
operation mode set by the mode setting unit. A fade control unit for controlling the generation
operation of the output signal by the output signal generation unit; and the fade control unit
controls the output signal generation unit with respect to the external signal generation unit.
When the output signal for one of the user's right and left ears is generated from at least the
external signal and the output signal for the other is generated from at least the audio signal, A
processing device is provided.
[0014]
Further, the mode setting unit can also set at least an audio mode corresponding to the output
signal as the operation mode instead of the external mode, and the fade control unit sends the
output signal generation unit to the output signal generation unit. When the audio mode is set,
the output signal of the stereo may be generated from the audio signal of the stereo.
[0015]
The output signal generation unit further includes a noise cancellation signal generation unit that
09-05-2019
4
generates a noise cancellation signal that reduces an external sound represented by the external
signal based on the external signal acquired by the external signal acquisition unit. In order to
reduce external sound, the noise cancellation signal may be superimposed on the output signal
generated from the audio signal.
[0016]
Also, the external signal acquisition unit acquires the external signal of stereo, and the signal
processing device, when the external mode is set, is based on the external signal of stereo
acquired by the external signal acquisition unit. And a direction specifying unit specifying a
direction of the transmission source of the external signal with respect to the user, wherein the
fade control unit detects the right ear of the user according to the direction of the transmission
source specified by the direction specifying unit. And the output signal for the other ear
generated from the external signal may be determined from the output signal of the left ear.
[0017]
The fade control unit causes the output signal generation unit to output the output signal for the
right ear when the direction identification unit identifies the direction of the transmission source
in a plane including the front-rear direction of the user. And the external signal for the right ear
is generated by superimposing the audio signal for the right ear and the external signal for the
right ear, and the output signal for the left ear is the audio signal for the left ear and the external
signal for the left ear May be generated by superimposing.
[0018]
Further, when the external mode is set, the fade control unit causes the output signal generation
unit to generate the one-use output signal from only the external signal, and the stereo audio
signal is monaural. It may be converted into an audio signal to generate the other output signal.
[0019]
Further, the mode setting unit may be capable of switching between the voice mode and the
external mode according to the user's operation.
[0020]
Further, unlike the voice signal and the external signal, the mode setting unit further includes an
information signal acquisition unit for acquiring, from an external information transmission
device, an information signal representing voice information to be provided to the user. When
the information signal acquisition unit acquires the information signal, the information mode
09-05-2019
5
corresponding to the output signal to be generated is set as the operation mode, and the fade
control unit sets the information mode when the information mode is set. The output signal
generation unit may generate the one output signal from at least the information signal and the
other output signal from at least the audio signal.
[0021]
The voice recognition unit further includes a voice recognition unit that obtains the external
signal in the voice mode and determines whether the external signal includes a predetermined
voice signal, and the mode setting unit is configured to receive the external signal. If it is
determined that the predetermined audio signal is included, the operation mode may be switched
to the external mode.
[0022]
Further, the output signal generation unit includes, for each of the output signals for the right ear
and for the left ear among the output signals for the stereo, the audio signals for the right ear
and for the left ear among the audio signals for the stereo. An audio signal adjusting unit having
a plurality of faders whose volume can be adjusted, and an external signal having a plurality of
faders capable of adjusting the volume including the external signals for the right and left ears
among the external signals of the stereo And an adjustment unit.
[0023]
In order to solve the above problems, according to another aspect of the present invention, there
is provided an audio signal acquisition step of acquiring an audio signal representing stereo
audio content, and an external sound obtained by collecting ambient sound. An external signal
acquiring step of acquiring an external signal representing the mode, a mode setting step of
setting at least an external mode corresponding to an output signal representing a stereo sound
provided to the user, and an operation mode set in the mode setting step. Accordingly, an output
signal generation step of generating an output signal representing a stereo sound provided to the
user from the audio signal acquired in the audio signal acquisition step and the external signal
acquired in the external signal acquisition step. In the output signal generation step, when the
external mode is set, the upper side of one of the user's right and left ears is used. And it
generates at least the external signal output signal, generated from at least the audio signal the
output signal for the other, the signal processing method is provided.
[0024]
In order to solve the above problems, according to another aspect of the present invention, a
computer may be obtained by collecting an audio signal acquisition function of acquiring an
09-05-2019
6
audio signal representing stereo audio content, and collecting surrounding sounds. Represents an
audio of a stereo provided to the user from an external signal acquisition function of acquiring an
external signal representing an external sound, an audio signal acquired by the audio signal
acquisition function, and an external signal acquired by the external signal acquisition function.
An output signal generation function capable of generating an output signal, a mode setting
function capable of setting an external mode corresponding to the output signal to be generated
at least as an operation mode of the output signal generation function, and the mode setting
function set And a fade control function of controlling the generation operation of the output
signal by the output signal generation unit according to the operation mode. When the external
mode is set for the output signal generation function, the drive control function generates the
output signal for at least one of the user's right and left ears from at least the external signal, and
A program is provided for realizing that the output signal for the other is at least generated from
the audio signal.
[0025]
As described above, according to the present invention, it is possible to provide surrounding
sound while reducing discomfort and annoyance caused by preventing listening to sound such as
music.
[0026]
It is an explanatory view for explaining an outline of a headphone concerning each embodiment
of the present invention.
It is an explanatory view for explaining an outline of a headphone concerning each embodiment
of the present invention.
It is an explanatory view for explaining an outline of a headphone concerning each embodiment
of the present invention.
It is an explanatory view for explaining composition of headphones concerning a 1st embodiment
of the present invention.
It is an explanatory view for explaining composition of a control part of headphones concerning
09-05-2019
7
the embodiment.
It is an explanatory view for explaining composition of an output signal generation part of
headphones concerning the embodiment.
It is an explanatory view for explaining operation of a headphone concerning the embodiment.
It is an explanatory view for explaining operation in a voice mode of headphones concerning the
embodiment.
It is an explanatory view for explaining operation in external mode of headphones concerning the
embodiment.
It is an explanatory view for explaining operation in external mode of headphones concerning the
embodiment.
It is an explanatory view for explaining operation at the time of operation mode change of
headphones concerning the embodiment.
It is an explanatory view for explaining composition of a headphone concerning a 2nd
embodiment of the present invention.
It is an explanatory view for explaining composition of a headphone concerning a 3rd
embodiment of the present invention.
FIG. 18 is an explanatory diagram for describing a configuration example of a computer that
realizes a series of processes by executing a program.
[0027]
09-05-2019
8
The present invention will now be described more fully with reference to the accompanying
drawings, in which exemplary embodiments of the invention are shown.
In the present specification and the drawings, components having substantially the same
functional configuration will be assigned the same reference numerals and redundant description
will be omitted.
[0028]
The signal processing device according to each embodiment of the present invention can be
implemented in various forms.
For example, the signal processing apparatus can be implemented as headphones such as, for
example, an outer-ear headphone, an ear-ear headphone, an earphone, and a headset. In addition,
as an example of another signal processing apparatus, for example, a mobile phone, a mobile
player, a computer, a PDA (Personal Data Assistance), etc. that provide an audio signal to the
above-mentioned headphone can be mentioned. Further, in the case of these terminals or the like,
the signal processing device can also be implemented as a DSP (Digital Signal Processor) of the
terminal. That is, each embodiment of the present invention can be realized as various devices,
terminals, and the like that can provide an audio signal and the like to the user. However, in
order to facilitate the understanding of the signal processing device according to each
embodiment of the present invention, the following description will be given taking the case
where this signal processing device is realized as a headphone 1 as an example.
[0029]
The headphones 1 according to each of the embodiments acquire "audio signals S, SL, SR"
representing stereo audio content from an external audio signal reproduction device or the like,
as with ordinary headphones, etc. It is possible to provide the user (wearer) as an actual sound.
The audio content represented by the audio signal includes various things such as music, radio
broadcast, television broadcast, teaching materials such as English conversation, entertainment
content such as rakugo, game sound, sound of moving pictures, operation sound of computer,
etc. There is no particular limitation. In addition to this, the headphone 1 according to each
embodiment can appropriately provide surrounding sounds to the user. Here, surrounding
sounds are referred to as “external sounds MS, MSL, MSR”, and signals obtained by collecting
09-05-2019
9
the external sounds are referred to as “external signals M, ML, MR”. Also, the sound generated
by the headphone 1 and actually provided to the user by driving the speaker or the like is
referred to as "output sound OS, OSL, OSR", and a signal representing this output sound is
referred to as "output signal O, OL". , OR.
[0030]
Since the audio signal is supplied as stereo, the audio signal for the left ear of the user is referred
to as an audio signal SL, and the audio signal for the right ear is referred to as an audio signal SR.
On the other hand, when the two are not distinguished from each other, it is referred to as an
audio signal S. Also, since the output signal and the output sound are also stereo in the same
manner, when simply referring to the output signal O and the output sound OS, it is treated as if
there is no distinction between left and right. Further, in the case of the output signal OL and the
output sound OSL, and the output signal OR and the output sound OSR, it is assumed that they
are signals and sounds representing for the left ear or for the right ear. Also, the external signal
and the external sound may be monaural or stereo depending on the conditions, conditions, and
the like. Therefore, in the case of stereo, those for the left ear are referred to as the external
signal ML and the external sound MSL, and those for the right ear are referred to as the external
signal MR and the external sound MSR. On the other hand, when the two are not distinguished or
are monaural, they are referred to as the external signal M and the external sound MS.
[0031]
In order to facilitate understanding of the headphones 1 according to the embodiments of the
present invention, the following description will be made in the following order. 1. Outline of
headphones according to each embodiment of the present invention First embodiment 2-1.
Configuration of headphones 2-2. Configuration of control unit 2-3. Configuration of Output
Signal Generation Unit 2-4. Operation of headphone 2-4-1. Operation in voice mode 2-4-2.
Operation in External Mode 2-4-3. Operation at the end of the external mode 2-4-4. Operation in
information mode 2-5. Example of effect 3. Second embodiment 4. Third embodiment
[0032]
<1. Overview of Headphones According to Embodiments of the Present Invention> FIG. 1 is
an explanatory diagram for describing an overview of headphones according to the embodiments
09-05-2019
10
of the present invention. As described above, the signal processing device according to each
embodiment of the present invention is implemented as the headphone 1 illustrated in FIG. In
FIG. 1, the wearer of the headphone 1 is a user U, and the source of the external sound MSR that
the user U wants to listen to is a transmitter MM here.
[0033]
Note that the external sound MSR does not have to be a voice uttered by a person, for example,
can be recognized as a sound such as a broadcast such as an announcement, a received sound of
a mobile phone, a siren of an emergency vehicle, a mere object sound Any sound may be used.
[0034]
Such external sound MSR is hard to be recognized by the user when the user is listening to the
output sounds OSL and OSR generated from the audio signal.
In addition, when the noise canceling function for further enjoying the audio content represented
by the audio signal is working, it is difficult for the user to further recognize the external sound
MSR.
[0035]
On the other hand, the outline | summary of the headphone which concerns on each embodiment
of this invention is shown to FIG. 2A and 2B. As shown in FIG. 2A, when the external sound MS is
monaural, the headphone 1 outputs the external signal M as an output signal OR in the right
direction where the sender MM is located. On the other hand, the headphones 1 convert the
stereo audio signals SL and SR into monaural signals and output them as an output signal OL in
the left direction different from the direction in which the sender MM is located.
[0036]
On the other hand, as shown in FIG. 2B, when the external sounds MSL and MSR are in stereo,
the headphone 1 converts the stereo external signals ML and MR into monaural while the output
signal in the right direction where the transmitter MM is also located Output as OR. As the output
09-05-2019
11
signal OL, the headphone 1 converts the stereo audio signals SL and SR into monaural and
outputs the same as described above.
[0037]
Therefore, the user U can listen to the external sound MS as an output sound OSR according to
the direction of the sender MM of the external sound MSR, while the other output sound OSL is
an audio signal S converted into monaural. You can listen to Therefore, the user U does not have
to perform a bothersome operation such as removing the headphone 1 and does not receive an
unpleasant feeling such as interruption of listening to the audio content or missed listening to
one of the left and right sounds. It is possible to listen. Furthermore, at that time, the direction of
the output sound OSR on the side provided with the external sound MS enables the user U to also
recognize the direction of the source of the external sound MS.
[0038]
When normal stereo audio signals SL and SR are used as stereo output signals OL and OR, the
operation mode of the headphone 1 is referred to as "audio mode" here. Further, when the
external signal M is provided as at least one of the output signals OL and OR as shown in FIGS.
2A and 2B, the operation mode of the headphone 1 is referred to as “external mode” here.
Furthermore, as described later, in place of the external signal M in the external mode, the
headphone 1 can also provide predetermined information obtained from the outside as at least
one output signal OL, OR. Therefore, the operation mode of the headphone 1 in this case is
referred to as "information mode" here.
[0039]
Hereinafter, the headphones 1 according to the embodiments of the present invention will be
described more specifically. However, the operation, effects, and the like of the headphone 1
described here are merely an example, and the headphones 1 according to the embodiments are
not limited to these, and it is possible to exhibit similar operations, effects, and the like. Needless
to say.
[0040]
09-05-2019
12
<2. First embodiment> (2-1. Configuration of Headphones] FIG. 3 is an explanatory diagram
for describing a configuration of the headphones according to the first embodiment of the
present invention. As shown in FIG. 3, the headphone 1 according to the present embodiment
includes an audio signal acquisition unit 11, a digital / analog conversion circuit 12, an
amplification circuit 13, an external signal acquisition unit 14, and an information signal
acquisition unit 15. A control unit 20, an output signal generation unit 100, and speakers SPL
and SPR are included.
[0041]
The audio signal acquisition unit 11 acquires audio signals SL and SR representing stereo audio
content. The audio signal acquisition unit 11 can be configured as an input terminal in the case
of the headphone 1. Further, when the signal processing apparatus according to each
embodiment of the present invention has a reproduction function or a broadcast wave reception
function, it is also possible to realize the audio signal acquisition unit 11 as a reproduction
function or a broadcast wave reception function. The audio signals SL and SR acquired by the
audio signal acquisition unit 11 are sent to the output signal generation unit 100.
[0042]
Here, it is assumed that the audio signals SL and SR, and the other signals external signals ML
and MR and information signals IL and IR are digital signals.
[0043]
In the case of the voice mode, the output signal generation unit 100 generates an output signal
OL from the voice signal SL, and generates an output signal OR from the voice signal SR.
The operation in the other operation mode of the output signal generation unit 100 will be
described later as needed. Further, the output signals OL and OR generated by the output signal
generation unit 100 are sent to the digital / analog conversion circuit 12.
[0044]
09-05-2019
13
The digital / analog conversion circuit 12 converts the digital output signals OL, OR generated by
the output signal generation unit 100 into analog output signals OL, OR. Then, the converted
output signals OL and OR are sent to the amplifier circuit 13.
[0045]
The amplification circuit 13 amplifies the analog output signals OL and OR converted by the
digital / analog conversion circuit 12 at a predetermined amplification factor or an amplification
factor set by the user U. The amplified output signals OL and OR are output to the left and right
speakers SPL and SPR, respectively, and provided from the speakers SPL and SPR to the user U
as the left and right output sounds OSL and OSR. The digital / analog conversion circuit 12 and
the amplifier circuit 13 may be integrally formed as, for example, a digital amplifier.
[0046]
On the other hand, the external signal acquisition unit 14 acquires external signals ML and MR
representing external sounds MSL and MSR obtained by collecting surrounding sounds. The
headphone 1 according to the present embodiment has a noise canceling function, and the
external signal acquiring unit 14 is configured as a sound collecting device (not shown) such as a
speaker provided for the noise canceling function. It is possible. The sound collecting apparatus
is provided in the left and right housings of the headphone 1 and the like, and can collect
external sounds MS on the left and right with respect to the headphone 1 in stereo. Then, the
external signal acquisition unit 14 converts the collected external sounds MSL and MSR into
digital external signals ML and MR. Note that the sound collection device as the external signal
acquisition unit 14 may be one for either a feedback type or a feedforward type noise canceling
function. Furthermore, unlike this example, the headphone 1 does not have a noise canceling
function, and the external signal acquisition unit 14 acquires external signals ML and MR from a
dedicated sound collector or an external sound collector. It can also be configured as a
connection terminal. The external signals ML and MR acquired by the external signal acquisition
unit 14 are sent to the output signal generation unit 100.
[0047]
09-05-2019
14
In the case of the voice mode, the output signal generation unit 100 generates left and right
noises (external sounds MS) which the user U will listen to along with the output sounds OSL and
OSR by the voice signals SL and SR. (NC) (noise cancellation) signals NL and NR are generated.
Then, the output signal generation unit 100 superimposes the NC signals NL and NR on the
output signals OL and OR generated from the audio signals SL and SR.
[0048]
On the other hand, in the case of the external mode, the output signal generation unit 100
extracts the external sounds MSL and MSR to be provided to the user from the external signals
ML and MR, and outputs for one of the right and left ears of the user U A signal O is generated at
least from the external signal M. Further, the output signal generation unit 100 generates an
output signal O for at least the other from the audio signal S.
[0049]
Unlike the audio signal S and the external signal M, the information signal acquisition unit 15
acquires information signals IL and IR representing audio information to be provided to the user
U from an external information transmission device (not shown). For that purpose, the
information signal acquisition unit 15 has a wired or wireless communication function with the
information transmission apparatus. At this time, the information signal acquisition unit 15 may
be communicable with the information transmission apparatus via a network or the like, or may
be directly communicable. Note that various pieces of information can be used as this audio
information. For example, disaster information and emergency information such as an
earthquake early warning that has been spreading in recent years, navigation information
representing a route to a current location or a destination, arrival information representing
arrival at a specific station by train, etc. are used as information signals. It is possible.
Furthermore, when the signal processing device according to the present embodiment is a mobile
phone, the information signal acquisition unit 15 can be configured as a call function, and a ring
tone and a call can be used as an information signal. Like the audio signal S and the external
signal M, the information signals IL and IR are preferably digital signals representing the
information in audio, but may be not only stereo but also monaural.
[0050]
The information signals IL and IR acquired by the information signal acquisition unit 15 are sent
to the control unit 20. In the case of the information mode, the control unit 20 outputs the
09-05-2019
15
information signals IL and IR to the output signal generation unit 100.
[0051]
At this time, the output signal generator 100 uses the information signals IL and IR instead of the
external signals ML and MR in the external mode.
That is, the output signal generation unit 100 generates an output signal O for at least one of the
right ear and the left ear of the user U from at least the information signals IL and IR. Further, the
output signal generation unit 100 generates an output signal O for the other from at least the
audio signal S.
[0052]
As described above, the output signal generation unit 100 switches and generates the output
signals OL and OR in accordance with the set operation mode. In other words, as the operation
mode of the output signal generation unit 100, each mode (voice mode, external mode,
information mode) corresponding to the output signals OL and OR to be generated is set. Such
control of mode switching and operation of the output signal generation unit 100 is performed
by the control unit 20. Therefore, next, the control unit 20 will be described, and then, a specific
configuration example of the output signal generation unit 100 will be described.
[0053]
(2−2. Configuration of Control Unit) FIG. 4 is an explanatory diagram for describing a
configuration of a control unit of a headphone according to the present embodiment. As shown
in FIG. 4, the control unit 20 of the headphone 1 according to the present embodiment includes a
direction specifying unit 21, a voice recognition unit 22, a storage unit 23, a timer 24, a mode
setting unit 25, and a fade control unit And 26.
[0054]
09-05-2019
16
When at least the external mode is set, the direction specifying unit 21 is the sender of the
external signal ML, MR to the user U, that is, the headphone 1, based on the stereo external
signals ML, MR acquired by the external signal acquisition unit 14. MM direction (also referred
to as "outgoing direction". Identify). That is, the direction identification unit 21 obtains the
external signals ML and MR, and compares the data of the two. Then, the external signal with the
larger volume is identified as the transmission direction. Note that, as described later, the output
signal generation unit 100 extracts an external sound MS to be provided to the user U, such as a
human voice, from the external signals ML and MR. The external signals ML and MR after this
extraction are also referred to as external signals ML and MR here. Therefore, it is desirable that
the direction specifying unit 21 acquire the extracted external signals ML and MR and use them
for specifying the transmission direction. The direction specifying unit 21 outputs the direction
signal Dir representing the specified transmission direction to the fade control unit 26.
[0055]
Whether the voice recognition unit 22 acquires the extracted external signals ML and MR from
the direction specifying unit 21 or the output signal generation unit 100 in the voice mode, and
does the external signals ML and MR include a predetermined voice signal? It is determined
whether or not. When the voice recognition unit 22 includes such a predetermined voice signal,
the voice recognition unit 22 outputs a mode switching signal CM instructing the mode setting
unit 25 to switch the operation mode to the external mode.
[0056]
The predetermined sound may be, for example, a siren of an emergency vehicle, a sound of a
content usually issued by a store salesperson, a voice or sound of a content notifying an
emergency, or a sound of a predetermined frequency or pattern preset by the user. Can be
mentioned. Note that such predetermined voice information is recorded in advance in the storage
unit 23. Then, for example, when the feature amount (frequency, waveform, character data after
voice recognition, etc.) of the external signals ML and MR is equal to the feature amount of the
recorded information, the voice recognition unit 22 determines a predetermined voice signal. It is
possible to detect
[0057]
The timer 24 is set by the user U or the like, and outputs a mode switching signal CM instructing
the mode setting unit 25 to switch the operation mode to the external mode, the voice mode or
09-05-2019
17
the external mode when a predetermined time elapses. .
[0058]
The mode setting unit 25 sets, as an operation mode of the output signal generation unit 100,
any one of an audio mode, an external mode, and an information mode corresponding to the
output signals OL and OR to be generated.
Then, the mode setting unit 25 outputs mode information Mod representing the set operation
mode to the fade control unit 26.
[0059]
The switching timing of the operation mode by the mode setting unit 25 will be described.
Although various operation mode switching timings can be set, at least four switching timings are
set in this embodiment as the switching timing from the voice mode to another mode.
[0060]
As the first switching timing, the mode setting unit 25 can switch the operation mode from the
voice mode to the external mode or the information mode according to the mode switching signal
CM input according to the operation of the user U. . In this case, the user U operates the
operation unit (not shown), and the mode setting unit 25 acquires the mode switching signal CM
which is an operation signal input from the operation unit. Then, the mode setting unit 25
switches the operation mode to the mode (external mode or information mode) represented by
the mode switching signal CM.
[0061]
As the second switching timing, there is a case where it is determined by the voice recognition
unit 22 that the external signals ML and MR include a predetermined voice signal. That is, when
the mode setting unit 25 acquires the mode switching signal CM from the voice recognition unit
09-05-2019
18
22, the mode setting unit 25 can switch the operation mode from the voice mode to the external
mode.
[0062]
A case where the mode switching signal CM from the timer 24 is input to the mode setting unit
25 is given as the third switching timing. By assigning a signal corresponding to the external
mode or the information mode as the mode switching signal CM output from the timer 24, the
mode setting unit 25 can switch the operation mode from the voice mode to the external mode
or the information mode. It is.
[0063]
As the fourth switching timing, the mode setting unit 25 can switch the operation mode to the
information mode when the information signal acquisition unit 15 acquires the information
signals IL and IR. FIG. 4 exemplifies the case where the operation mode is switched to the
information mode when the mode setting unit 25 acquires the information signals IL and IR.
However, also at this fourth switching timing, it is possible to use the mode switching signal CM
as in the other timings. In this case, when the information signal acquiring unit 15 acquires the
information signals IL and IR, the mode switching signal CM is output from the mode setting unit
25, but the information signals IL and IR are output from the information signal acquiring unit
15. It may be supplied directly to the output signal generator 100.
[0064]
It is needless to say that the switching timing from the voice mode to the other mode mentioned
here is just an example, and various applications can be considered. Further, switching from the
mode other than the voice mode to the mode other than the voice mode can be set in various
combinations by using the mode switching signal CM or the like as described above.
[0065]
Further, for switching from the state in which the external mode or the information mode is set
to the voice mode, a mode switching signal CM according to the user operation, a mode
switching signal CM output from the timer 24, an external signal or an information signal is
09-05-2019
19
input. It can be set variously, for example, when it is lost.
[0066]
The fade control unit 26 controls the generation operation of the output signals OL and OR by
the output signal generation unit 100 according to the operation mode set by the mode setting
unit 25.
As will be described later, the output signal generation unit 100 adjusts the volume levels of the
audio signals SL and SR, the external signals ML and MR, and the information signals IL and IR
included in the output signals OL and OR, respectively. It has a fader. Therefore, the fade control
unit 26 also includes the operation mode (in some cases, the transmission direction). The output
signal generation unit 100 is supplied with a fade signal Cont for changing the volume level
adjusted by each of these faders according to.
[0067]
As described above, in the case of the external mode, the output signal generation unit 100
extracts the external sounds MSL and MSR to be provided to the user from the external signals
ML and MR, and uses them for one of the right and left ears of the user U. Output signal O of at
least the external signal M. At this time, the fade control unit 26 generates an output from the
external signal M out of the output signals OL and OR of the left ear and the right ear of the user
U according to the direction of the sender MM specified by the direction specifying unit 21.
Determine the signal. Therefore, in this external mode, the fade control unit 26 adjusts the fade
signal Cont to adjust the external signal M to be included in the output signals OL and OR
corresponding to the transmission direction specified by the direction specifying unit 21. Ru.
[0068]
That is, for example, when the transmission direction is the left side of the user U, that is, the left
side of the headphone 1, the output signal generation unit 100 includes the external signal M in
at least the output signal OL of the left channel. On the other hand, when the transmission
direction is the right side of the user U, that is, the right side of the headphone 1, the output
signal generation unit 100 includes the external signal M in at least the output signal OR of the
09-05-2019
20
right channel. Furthermore, for example, when the transmission direction is not biased in any of
the left and right directions of the user U, that is, when the transmission direction is in a plane
including the front and back direction of the user, the output signal generation unit 100
generates both left and right channels. The external signal M is included in the output signals OL,
OR of.
[0069]
At this time, when the transmission direction is the left side or the right side of the user U, the
output signal generation unit 100 monaural the stereo audio signals SL and SR in the output
signals OR and OL of the channels not including the external signal M. And include that
monophonic audio signal S. On the other hand, when the transmission direction is not biased in
any of the left and right directions of the user U, the output signals OL and OR of both channels
include the external signal M. In this case, the output signal generation unit 100 includes
corresponding ones of the audio signals SL and SR on the channel side with respect to each of
the output signals OL and OR of the both channels. As a result, the output signal generation unit
100 superimposes the external signal ML on the audio signal SL to generate the output signal
OL, and superimposes the external signal MR on the audio signal SR to generate the output signal
OR.
[0070]
The configuration of the output signal generation unit 100 will be described as to how each fader
of the output signal generation unit 100 is controlled by the fade signal Cont output from the
fade control unit 26, and then the headphone 1. This will be described by illustrating the
operation of FIG.
[0071]
(2−3.
Configuration of Output Signal Generation Unit] FIG. 5 is an explanatory diagram for describing a
configuration of an output signal generation unit of a headphone according to the present
embodiment. The configuration of output signal generation unit 100 shown in FIG. 5 is merely an
example, and it goes without saying that various circuit configurations capable of performing the
same operation as described above are possible.
09-05-2019
21
[0072]
As shown in FIG. 5, the configuration example of the output signal generation unit 100 includes
the equalizers 101L and 101R, the noise cancellation signal generation units 102L and 102R, the
external sound extraction units 103L and 103R, the volume adjustment fader 111, and the noise
cancellation. The adjustment fader 112, the external signal adjustment fader 113, the
information signal adjustment fader 114, the monitor fader 120, the cross fader 130, and the
addition circuits 151 to 158 are provided.
[0073]
First, the lines of the audio signals SL and SR will be described.
The equalizers 101 </ b> L and 101 </ b> R are arranged one by one for the left and right
channels, respectively, and acquire the audio signals SL and SR corresponding to the respective
channels from the audio signal acquisition unit 11. Then, the equalizers 101L and 101R change
the frequency characteristics of the audio signals SL and SR. The equalizers 101L and 101R
change the frequency characteristics of the audio signals SL and SR to predetermined frequency
characteristics or frequency characteristics set by the user U. Depending on the setting, the
equalizers 101L and 101R can output the audio signals SL and SR without changing the
frequency characteristics.
[0074]
The volume adjustment fader 111 is an example of a volume adjustment unit, and also has 2
faders, one for each of the left and right channels, and each fader is an audio signal SL
corresponding to each channel from the equalizers 101L and 101R. , SR. Then, the volume
adjustment fader 111 adjusts the volume level of the audio signals SL and SR of each channel to
the value set by the user U.
[0075]
In the following, for convenience of description, the left channel is referred to as "L (left) channel"
and the right channel is also referred to as "R (right) channel".
09-05-2019
22
[0076]
The cross fader 130 is an example of an audio signal adjustment unit, and has a plurality of
faders capable of adjusting the volume level including each of the stereo audio signals SL and SR
for each of the output signals OL and OR.
The number of faders of the cross fader 130 will be four, and each fader will be described more
specifically as the faders LL, LR, RL, and RR.
[0077]
The fader LL of the cross fader 130 acquires the audio signal SL of the L channel from the
volume adjustment fader 111 and outputs the audio signal SL to the addition circuit 151 so as to
be included in the output signal OL of the L channel. The fader LR of the cross fader 130
acquires the audio signal SR of the R channel from the volume adjustment fader 111, and outputs
the audio signal SR to the addition circuit 152 so as to be included in the output signal OL of the
crossed L channel. The fader RL of the cross fader 130 acquires the audio signal SL of the L
channel from the volume adjustment fader 111, and outputs the audio signal SL to the addition
circuit 153 so as to be included in the output signal OR of the crossed R channel. The fader RR of
the cross fader 130 acquires the audio signal SR of the R channel from the volume adjustment
fader 111 and outputs the audio signal SR to the addition circuit 154 so as to be included in the
output signal OR of the R channel.
[0078]
At this time, each of the faders LL, LR, RL, RR of the cross fader 130 can adjust the volume level
of the audio signal to be included in the output signal OL, OR of each channel.
[0079]
Here, the lines of the external signals ML and MR will be described.
The noise cancellation signal generation units 102L and 102R are arranged one by one for the
09-05-2019
23
left and right channels, and acquire external signals ML and MR corresponding to the respective
channels from the external signal acquisition unit 14. Then, based on the external signals ML and
MR, the noise cancellation signal generation units 102L and 102R generate NC signals NL and
NR for reducing the external sound MS represented by the external signals ML and MR. The
external sound MS includes noise (noise) emitted from an external noise source or the like.
Therefore, the external signals ML and MR include noise signals. Therefore, the noise
cancellation signal generation units 102L and 102R generate, from the noise signal, NC signals
NL and NR for reducing noise for each channel. At this time, the noise cancellation signal
generation units 102L and 102R have filters for generating the NC signals NL and NR, and
process the noise signals with this filter to generate the NC signals NL and NR. The noise
reduction characteristic is determined by the type of the filter.
[0080]
Examples of the noise reduction characteristic include the distribution of the noise removal rate
for the frequency band, the time required for NC signal generation, and the NC signal generation
method. Then, as an example of processing in the filter, the phase of the noise signal may be
inverted. According to this processing example, when the NC signal is output as sound, this
output sound interferes with each other and destructively with noise. The noise reduction
characteristic and the process in the filter mentioned here are just an example, and the present
invention is not limited to these examples.
[0081]
In addition, as noise reduction characteristics in the noise cancellation signal generation units
102L and 102R, characteristics in which noise reduction with respect to the frequency band of
the external sound MS extracted by the external sound extraction units 103L and 103R
described later is suppressed compared to other frequency bands. Is desirable.
[0082]
The noise cancellation adjustment fader 112 has two faders arranged one by one in the left and
right channels, and the faders of each channel acquire the NC signals NL and NR corresponding
to that channel.
Then, the noise cancellation adjustment fader 112 is previously set to a value capable of
09-05-2019
24
reducing the noise to the maximum, and the NC signals NL and NR are amplified by the value.
The amplification factor of the noise cancellation adjustment fader 112 is preferably set to an
appropriate value in advance as described above, and may be fixed.
[0083]
The NC signals NL and NR adjusted by the noise cancellation adjusting fader 112 are
superimposed (mixed) on the output signals OL and OR of the corresponding channels by the
adding circuits 151 to 154, respectively. Therefore, regardless of the value of the cross fader
130, the output signals OL and OR are superimposed with the NC signals NL and NR to reduce
noise.
[0084]
Next, another line of the external signals ML and MR will be described. The external sound
extraction units 103L and 103R are arranged one by one for the left and right channels, and
acquire external signals ML and MR corresponding to the respective channels from the external
signal acquisition unit 14. Then, the external sound extraction units 103L and 103R extract
external signals ML and MR in a frequency band that the user desires to listen to, such as human
voice and a siren of an emergency vehicle, for example. More specifically, the external sound
extraction units 103L and 103R have band pass filters and the like, and output only the external
signals ML and MR in the above frequency band, and the external signals ML and MR in other
frequency bands. Cut The external signals ML and MR extracted by the external sound extraction
units 103L and 103R are sent to the control unit 20 and used for specifying the transmission
direction and the like.
[0085]
The external signal adjustment fader 113 is an example of the external signal adjustment unit,
and also has 2 faders arranged one by one for each of the left and right channels, and each fader
is extracted from the external sound extraction units 103L and 103R. The external signals ML
and MR corresponding to the channel are acquired. Then, the external signal adjustment fader
113 is set to a value at which the external sound MS extracted in advance is an optimal volume,
and the external signals ML and MR are amplified by that value. As a result, the external signal
adjustment fader 113 can emphasize the external sound MS extracted by the external sound
09-05-2019
25
extraction units 103L and 103R. The amplification factor of the external signal adjusting fader
113 is preferably set to an appropriate value in advance as described above, and may be fixed.
[0086]
However, it is desirable that the external signal adjusting fader 113 shuts off the external signals
ML and MR when the information mode is set.
[0087]
The monitor fader 120 is an example of the external signal adjustment unit, and a plurality of
output signal OL and OR, respectively, can adjust the volume level including each of the stereo
external signals ML and MR (or information signals IL and IR). Have a fader.
The number of faders of the monitor fader 120 will be four, and the respective faders will be
described more specifically as faders LL, LR, RL, and RR.
[0088]
The fader LL of the monitor fader 120 obtains the external signal ML of the L channel from the
external signal adjustment fader 113 and adds the external signal ML to the output signal OL of
the L channel via the adding circuit 157 so as to be included Output to 155. The fader LR of the
monitor fader 120 obtains the external signal MR of the R channel from the external signal
adjustment fader 113, and adds the external signal MR to the crossed output signal OL of the L
channel via the adder circuit 157. It outputs to the addition circuit 155. The fader RL of the
monitor fader 120 obtains the external signal ML of L channel from the external signal
adjustment fader 113, and adds the external signal ML to the output signal OR of the crossed R
channel via the adding circuit 158 It outputs to the addition circuit 156. The fader RR of the
monitor fader 120 obtains the external signal MR of the R channel from the external signal
adjustment fader 113 and adds the external signal MR to the output signal OR of the R channel
via the adder circuit 158 Output to 156.
[0089]
At this time, each of the faders LL, LR, RL, RR of the monitor fader 120 can adjust the volume
level of the external signal to be included in the output signal OL, OR of each channel.
09-05-2019
26
[0090]
On the other hand, in the case of the information mode, the information signals IL and IR are
output from the control unit 20.
The information signal adjustment fader 114 is an example of an information signal adjustment
unit, and has two faders arranged one by one in left and right channels, and each fader is
information corresponding to each channel output from the control unit 20. Acquire the signals
IL and IR. Then, the information signal adjusting fader 114 is set to a value at which the
information signals IL and IR output from the control unit 20 become an optimal volume, and the
information signals IL and IR are amplified by the values. The amplification factor of the
information signal adjusting fader 114 is desirably set to an appropriate value in advance as
described above, and may be fixed.
[0091]
The information signals IL and IR output from the information signal adjusting fader 114 are
superimposed on the channels of the external signals ML and MR output from the external signal
adjusting fader 113 by addition circuits 161 and 162, respectively. On the other hand, when the
information signals IL and IR are acquired, as described above, the information mode is set, and
in the information mode, the external signal adjusting fader 113 blocks the external signals ML
and MR. Therefore, in this case, the information signals IL and IR are distributed to the output
signals OL and OR while the volume level is adjusted by the monitor fader 120 instead of the
external signals ML and MR.
[0092]
In the configuration described above, the external signal adjustment fader 113, the monitor fader
120, and the cross fader 130 are controlled by the respective faders according to the fade signal
Cont output from the control unit 20 according to the operation mode. Will be adjusted.
However, the external signal adjustment fader 113 blocks the external signals ML and MR in the
information mode, but amplifies the external signals ML and MR with fixed values in the other
modes.
09-05-2019
27
[0093]
The configuration of the headphone 1 according to the first embodiment of the present invention
has been described above. Next, the operation of the headphone 1 according to the first
embodiment of the present invention will be described.
[0094]
(2−4. First, the outline of the operation of the headphone 1 according to the present
embodiment will be described with reference to FIG. FIG. 6 is an explanatory diagram for
describing the operation of the headphones according to the present embodiment.
[0095]
As shown in FIG. 6, when the headphone 1 starts operation, first, the headphone 1 processes step
S101 (an example of an audio signal acquisition step and an external signal acquisition step). In
step S101, the audio signal acquisition unit 11 acquires the audio signals SL and SR, and the
external signal acquisition unit 14 acquires the external signals ML and MR. Although not shown,
the external signals ML and MR are used to generate the NC signals NL and NR by the noise
cancellation signal generation units 102L and 102R, and a predetermined sound signal is
generated by the speech recognition unit 22. It is used to check if it is included. After the process
of step S101, the process proceeds to step S103.
[0096]
In step S103 (an example of a mode setting step), the mode setting unit 25 sets an operation
mode according to the presence or absence of acquisition of the mode switching signal CM and
the information signals IL and IR. Then, the process proceeds to step S105.
[0097]
09-05-2019
28
In step S105, the fade control unit 26 confirms the operation mode. If the operation mode is the
voice mode, the process proceeds to step S107. If the operation mode is the external mode, the
process proceeds to step S109. If the operation mode is the information mode, the process
proceeds to step S111.
[0098]
In steps S107, S109, and S111 (an example of the output signal generation step), the fade
control unit 26 outputs the fade signal Cont corresponding to each mode to the output signal
generation unit 100, and the output signal from the output signal generation unit 100. Control
the generation operation. The values of the faders and the like in the output signal generation
unit 100 controlled by the fade signal Cont will be described in detail for each mode. On the
other hand, after the processes of steps S107, S109, and S111, the process proceeds to step
S113.
[0099]
In step S113, it is determined whether the headphone 1 ends the operation according to the user
operation or the input state of the audio signal. Then, when the user operation or the input state
of the audio signal represents the end of the operation, the operation is ended. On the other
hand, when the operation is not ended, the processes after step S101 are repeated.
[0100]
Here, an operation example of the headphone 1 in each mode will be described in the order of
the voice mode, the external mode, and the information mode.
[0101]
(2−4−1.
Operation in Audio Mode FIG. 7 is an explanatory diagram for describing an operation in audio
mode of the headphones according to the present embodiment.
09-05-2019
29
[0102]
When the audio mode is set in step S103 and the process proceeds to step S107, in step S107,
the fade control unit 26 sets each fader of the output signal generation unit 100 via the fade
signal Cont, for example, as shown in Table 1 below. Set to
[0103]
[0104]
By controlling each fader to a value as shown in Table 1, the fader of the monitor fader 120 cuts
off all the external signals ML and MR from the output signals OL and OR. The circuit
configuration is simplified as shown in FIG.
That is, the cross fader 130 mixes the L channel audio signal SL with the L channel output signal
OL, and mixes the R channel audio signal SR with the R channel output signal OR.
Therefore, the output signal OL is mixed with the L channel audio signal SL and the L channel NC
signal NL by the output signal generation unit 100 to become an L channel audio signal with
reduced noise. On the other hand, the output signal OR is mixed with the R channel audio signal
SR and the R channel NC signal NR to form an R channel audio signal with reduced noise.
Therefore, in the case of the audio mode, the headphones 1 can set the stereo audio signals SL
and SR as stereo output signals OL and OR corresponding to the respective channels.
[0105]
(2−4−2. Operation in External Mode FIG. 8 and FIG. 9 are explanatory diagrams for
explaining the operation in the external mode of the headphone according to the present
embodiment.
[0106]
When the external mode is set by the mode setting unit 25 in step S103 and the process
09-05-2019
30
proceeds to step S109, the process of FIG. 8 is performed in step S107.
[0107]
As shown in FIG. 8, in the external mode, first, step S201 is processed.
In step S201, the direction identification unit 21 confirms whether or not the external signal
acquisition time set in advance is in progress. The external signal acquisition time is set to, for
example, about 0.1 to several seconds, and when the external mode is set, step S201 is repeated
after step S207, or step S109 is repeated in the loop of FIG. When it does, counting is started.
And if it is during external signal acquisition time, it will progress to step S203, and if it is other
than that, it will progress to step S205.
[0108]
In step S203, the direction identifying unit 21 samples the external signals ML and MR. Then, the
process proceeds to step S201.
[0109]
On the other hand, in step S205, the direction identification unit 21 compares the external
signals ML and MR sampled in step S203, and identifies the one with the larger volume level as
the transmission direction. More specifically, for example, the direction identification unit 21
squares each of the sampled external signals ML and MR, accumulates them, and compares the
values on the left and right. Then, the direction identification unit 21 identifies the larger one as
the transmission direction. That is, when the external signal ML of the L channel is larger and the
absolute value of the difference between the two exceeds the predetermined threshold, the left
direction is set as the transmission direction. On the other hand, when the external signal MR of
the R channel is larger and the absolute value of the difference between the two exceeds the
predetermined threshold, the right direction is set as the transmission direction. Furthermore,
when the magnitudes of the values of the external signals ML and MR of both channels are equal
or the difference between the two is equal to or less than a predetermined threshold, the forward
and backward direction is taken as the transmission direction. In this step S205, it goes without
saying that the stored values of the external signals ML and MR are not compared with each
09-05-2019
31
other, but it is also possible to change the stored values of the absolute values, for example.
Further, the external signals ML and MR compared by the direction specifying unit 21 are the
external signals ML and MR from which the frequency bands of the audio to be targets are
extracted by the external sound extraction units 103L and 103R. After the process of step S205,
the process proceeds to step S207.
[0110]
In step S207, the direction specifying unit 21 determines whether the specified result of the
transmission direction matches a predetermined number of times. If the two or more times do
not match, the process from step S201 is repeated. If the two or more times match, the direction
identification unit 21 sends the fade control unit 26 the direction signal Dir indicating the
transmission direction. Then, the process proceeds to step S209.
[0111]
In the process described later, output signals OL and OR corresponding to the transmission
direction represented by the direction signal Dir are output. Therefore, the output signal OL,
which is frequently generated every external signal acquisition time in step S201, by noting
progressing to the next step with the identification result of one transmission direction in this
way, and taking a coincidence of a plurality of identification results. It can prevent that OR
changes. However, as in the case where the mode is switched to the external mode by the mode
switching signal CM or the like based on the operation of the user U, it is possible to proceed
directly to step S209 without processing step S207 when starting the external mode is there. As
described above, by not performing the determination a plurality of times at the start of the
external mode, it is possible to quickly switch the mode according to the operation of the user U
or the like.
[0112]
In step S207, when the identification result of the transmission direction matches a plurality of
times and proceeds to step S209, in step S209, the fade control unit 26 determines which of the
left, front, back, and right the transmission direction is. If the transmission direction is left, the
process proceeds to step S211. If the transmission direction is forward or backward, the process
proceeds to step S213. If the transmission direction is right, the process proceeds to step S215.
09-05-2019
32
[0113]
In steps S211, S213, and S215 (an example of the output signal generation step), the faders of
the output signal generation unit 100 are adjusted by the fade signal Cont generated by the fade
control unit 26, and the output signals OL and OR corresponding to the transmission direction
are It is generated. However, it is preferable that the fade control unit 26 gradually change each
fader to a setting value according to the transmission direction, instead of suddenly changing
each fader to the setting value according to the transmission direction.
[0114]
In step S211, that is, when the transmission direction is the left direction, the fade control unit
26 sets each fader of the output signal generation unit 100, for example, as shown in Table 2
below via the fade signal Cont. In Table 2, the fade direction indicates the fade direction when the
audio mode described in Table 1 is set to the external mode. The description of the fade direction
is the same as in the other tables and in FIGS. 8 and 10, and in steps S211 to S215 and steps
S303 to S307 in FIGS. 8 and 10, the fade of each fader of the cross fader 130 is The direction is
illustrated.
[0115]
[0116]
On the other hand, in step S213, that is, when the transmission direction is the front-back
direction, the fade control unit 26 sets each fader of the output signal generation unit 100 as
shown in, for example, Table 3 below via the fade signal Cont.
[0117]
[0118]
In step S215, that is, when the transmission direction is the right direction, the fade control unit
26 sets each fader of the output signal generation unit 100, for example, as shown in Table 4
below via the fade signal Cont.
09-05-2019
33
[0119]
[0120]
The case where the voice mode is changed to the external mode and step S215 is processed, that
is, the case where the transmission direction is the right direction will be more specifically
described.
[0121]
In step S215, each fader is controlled to a value as shown in Table 4, so that the output signal
generation unit 100 has a circuit configuration as shown in FIG. 9 in a simplified manner.
[0122]
That is, the cross fader 130 is adjusted so that the audio signals SL and SR of both L and R
channels are included at the same level in the output signal OL of L channel opposite to the
transmitting direction.
On the other hand, the cross fader 130 is cut off so that the audio signals SL and SR are not
included in the output signal OR of the R channel which is the same as the transmission direction.
It is desirable that the faders LL and LR of the cross fader 130 be set to a value (for example, -6
dB) lower than 0 dB so that the volume level does not become too large when downmixing the
audio signals SL and SR. .
However, in Tables 2 to 4, although -6 dB is illustrated as a value lower than 0 dB, this value is
not particularly limited.
[0123]
09-05-2019
34
On the other hand, the monitor fader 120 is adjusted so that the external signals ML and MR of
both LR channels are included to the same extent in the same degree in the output signal OR of
the R channel in the transmission direction.
On the other hand, monitor fader 120 is cut off so that external signals ML and MR are not
included in output signal OL of the L channel different from the transmission direction.
It is desirable that the faders RL and RR of the monitor fader 120 be set to a value lower than 0
dB (for example, -6 dB) so that the volume level does not become too large when downmixing the
external signals ML and MR. .
[0124]
Therefore, the L channel output signal OL and the R channel audio signal SR are downmixed by
the output signal generation unit 100 with respect to the L channel output signal OL different
from the transmission direction, and the L channel NC signal NL is further mixed It becomes an
audio signal that has been
On the other hand, the output signal OR of the R channel, which is the same as the transmission
direction, is an audio signal in which the external signal ML of the L channel and the external
signal MR of the R channel are downmixed and the NC signal NR of the R channel is further
mixed.
Therefore, in the external mode, the headphone 1 can set the monaural audio signal S as the L
channel output signal OL different from the transmitting direction, and the monaural external
signal M as the R channel output signal same as the transmitting direction It can be OR.
[0125]
As a result, the user U can listen not only to the external sound MS represented by the external
signal M, but also to the audio signal S in which one of the left and right audio signals S is not
missing. Therefore, it is possible to listen to the external sound MS represented by the external
signal M while enjoying the audio content represented by the audio signal S. At this time, the
09-05-2019
35
user U can also recognize the direction of the sender MM by the channel on which the external
sound MS is emitted.
[0126]
As described above, the case where the transmission direction is the right direction has been
described as an example, but when the transmission direction is the left direction, the fade
control unit 26 adjusts the fade signal Cont for adjusting each fader as shown in Table 2. Output.
As a result, it is possible to output the output signals OL and OR in which the LR channel is
reversed with respect to the case where the transmission direction is the right direction. In this
case, except that the signals flowing through the LR channel are reversed, basically the same
operation as in the case where the transmission direction is the right direction is performed, so
the detailed description will be omitted here.
[0127]
On the other hand, when the transmission direction is the front-rear direction, the fade control
unit 26 outputs a fade signal Cont for adjusting each fader as shown in Table 3. As a result, the
cross fader 130 includes the L channel audio signal SL in the L channel output signal OL and
includes the R channel audio signal SR in the R channel output signal OR. The monitor fader 120
then includes the L channel external signal ML in the L channel output signal OL, and the R
channel external signal MR in the R channel output signal OR.
[0128]
Therefore, the L channel output signal OL is a sound signal in which the L channel audio signal
SL and the L channel external signal ML are mixed, and the L channel NC signal NL is further
mixed. On the other hand, the output signal OR of the R channel is an audio signal in which the R
channel audio signal SR and the R channel external signal MR are mixed, and the R channel NC
signal NR is further mixed. Therefore, in the audio mode, the headphone 1 can mix the stereo
audio signals SL and SR with the stereo external signals ML and MR for each channel to produce
stereo output signals OL and OR.
[0129]
09-05-2019
36
As a result, the user U can listen not only to the external sound MS represented by the external
signal M but also to the audio signal S from which the left or right audio signal S is not missing.
Therefore, it is possible to listen to the external sound MS represented by the external signal M
while enjoying the audio content represented by the audio signal S. At this time, the user U can
also recognize the direction of the sender MM as the front-rear direction by the external sound
MS being emitted from both channels.
[0130]
Here, the case where the voice mode is changed to the external mode including the fade direction
has been described. However, for example, when the information mode is changed to the external
mode, and when the transmission direction is changed in the external mode, other operations
may be performed similarly although some fade directions are different. .
[0131]
(2−4−3. 6 and 10 for the operation when switching from the external mode to the voice
mode described here, that is, the operation when ending the external mode and switching to the
normal mode While explaining. FIG. 10 is an explanatory diagram for explaining an operation at
the time of operation mode switching of the headphones according to the present embodiment.
[0132]
When the operation mode is switched from the external mode to the voice mode in step S103
shown in FIG. 6, the process proceeds from step S105 to step S107, and in this step S107, the
process shown in FIG. 10 is performed.
[0133]
First, at the end of this external mode, step S301 is processed.
In step S301, the fade control unit 26 confirms the emission direction set in the external mode. If
09-05-2019
37
the transmission direction is the left direction, the process proceeds to step S303. If the
transmission direction is the front-rear direction, the process proceeds to step S305. If the
transmission direction is the right direction, the process proceeds to step S307.
[0134]
In steps S305, S307, and S309 (an example of the output signal generation step), the faders of
the output signal generation unit 100 are adjusted to the values shown in Table 1 by the fade
signal Cont generated by the fade control unit 26, and the output signal OL, An OR is generated.
At this time, as exemplified by the fade direction of the cross fader 130 in steps S305 to S309,
the fade control unit 26 does not suddenly change each fader to the setting value of the sound
mode, but sets each fader in the sound mode. It is desirable to gradually change to the set value.
Then, this external mode end operation is ended, and as shown in FIG. 6, the processing of step
S101 and subsequent steps is repeated via step S113.
[0135]
(2−4−4. Operation in Information Mode In the information mode which is the remaining
operation mode set in this embodiment, basically the same operation as the operation in the
external mode is performed. However, at this time, the fade control unit 26 sets the external
signal adjustment fader 113 to −∞ dB and shuts it down, and the information signal adjustment
fader 114 for the line through which the external signals ML and MR flow. Supply IL, IR.
Therefore, in the operation of the external mode, the information signals IL and IR are supplied
instead of the external signals ML and MR. Therefore, in the operation of the external mode, the
information signals IL and IR can be replaced with the information signals IL and IR, and the
information mode can be made the operation only by making some other changes, so the detailed
description is omitted here. .
[0136]
(2−5. Examples of Effects The headphones 1 according to the first embodiment of the
present invention have been described above. According to the headphone 1, it is possible to
simultaneously provide the user U with the audio content represented by the audio signal S and
at the same time the external sound MS represented by the external signal M according to the
operation mode. At this time, the stereo audio signal S is provided to the user U as it is in stereo,
09-05-2019
38
or converted to monaural and provided to the user U. Therefore, it is possible to prevent the user
U from feeling uncomfortable when the user U can not listen to either of the stereo audio signals
S, and to enjoy the audio of both channels of the audio signal S to the user U. In addition, it is
possible to make the user U recognize the direction in which the sender MM is located, by the
direction of the channel on which the external signal M is provided.
[0137]
According to the first embodiment of the present invention, in the external mode, by changing
the setting value of each fader, any one channel of the stereo audio signal S from the channel in
the direction different from the transmission direction. It is also possible to output an audio
signal S of However, in such a case, when the user U is equivalent to a state in which one side of
the headphone 1 is removed, and the difference between both channels of the stereo audio signal
S is large, the user U missed the audio signal S of the other channel. May cause discomfort.
Therefore, as described in the present embodiment, when the audio signal S is output from one of
the channels, the audio signal S obtained by downmixing stereo to monaural is output as the
output audio signal S. desirable.
[0138]
Further, in the present embodiment, since the noise cancellation function is provided, it is
possible to reduce noise and to improve the sound quality of the output sound OS by the output
signals OL and OR. Although such a noise cancellation function has spread rapidly in recent
years, the noise cancellation function reduces ambient sound as noise, so that the user U can
hear surrounding sound as compared to the case without such a function. It was difficult to listen
to. However, as described here, according to the headphone 1 according to the present
embodiment, it is possible to include ambient sound as the external sound MS in the output
sound OS. Therefore, when used in combination with such a noise canceling function, the effect
of eliminating the discomfort and inconvenience of the user U is doubled. However, it goes
without saying that the noise canceling function does not have to be used in combination.
[0139]
<3. Second Embodiment> According to the headphone 1 of the first embodiment, the audio
signals SL and SR and the external signal ML in each operation mode are changed by changing
09-05-2019
39
the set value of each fader in each operation mode. It is also possible to freely change the
combination with the MR.
[0140]
For example, in the first embodiment, when the transmission direction is right or left in the
external mode, the external signal M downmixed to monaural is output from the channel in the
transmission direction, and the other channel is down to monaural The mixed audio signal S was
output.
[0141]
On the other hand, for example, when the transmission direction is right or left in the external
mode, while the stereo audio signal S is output from the two channels on the corresponding
channel, the stereo external signal M is also output to the output signal O. It is also possible to
mix and output.
In this case, by setting the attenuation factor non-uniformly, such as decreasing the attenuation
factor on the channel side corresponding to the transmission direction with the fader LL of the
monitor fader 120 and the fader RR, the direction of the sender MM to the user U It is also
possible to make it recognize. However, it is of course possible to set the attenuation rates of the
fader LL and the fader RR uniformly.
[0142]
Further, in this case, unlike the first embodiment, it is possible to provide the user U with stereo
as it is without downmixing the stereo external signals ML and MR. At this time, the other faders
LR and RL of the monitor fader 120 are always set to −− dB. Therefore, it is also possible to use
the output signal generation unit 200 as illustrated in the second embodiment in FIG. 11 instead
of the output signal generation unit 100. The output signal generation unit 200 included in the
headphone according to the second embodiment has a monitor fader 220 instead of the monitor
fader 120. The monitor fader 220 according to the second embodiment has a configuration
obtained by removing the faders LR and RL and the two adders 157 and 158 from the monitor
fader 120 according to the first embodiment. Therefore, in addition to achieving the same
operation and effect as the first embodiment, it is possible to further simplify the apparatus
configuration and reduce the manufacturing cost.
09-05-2019
40
[0143]
<4. Third Embodiment> Furthermore, contrary to the second embodiment, when it is
sufficient to provide the information of the external signals ML and MR in monaural without
providing the information in stereo, the external signals may be transmitted even if the
transmission direction is the front and back direction. It is also possible to downmix ML and MR
and include them in both output signals OL and OR. In this case, in the headphone 1 according to
the first embodiment, when the external mode and the transmission direction are in the front and
back direction, the faders LR and RL in the monitor fader 120 are set from − 所 定 dB to
predetermined values equal to the faders LL and RR. It will be changed. Although the
predetermined value is set to -6 dB in the first embodiment, the predetermined value is further
increased so that the volume level does not become too large due to the downmixing of both the
left and right external signals ML and MR. It is desirable to be set to the value of attenuation.
[0144]
In this case, it is also possible to use the output signal generation unit 300 as exemplified in the
third embodiment in FIG. 12 instead of the output signal generation unit 100. The output signal
generation unit 300 included in the headphone according to the third embodiment has a monitor
fader 320 instead of the monitor fader 120. The monitor fader 320 according to the third
embodiment has a configuration obtained by removing the faders LR and RL and the two adders
157 and 158 from the monitor fader 120 according to the first embodiment. In addition, the
output signal generation unit 300 according to the third embodiment includes an addition circuit
351 that downmixes the external signals ML and MR (or the information signals IL and IR) of LR
both channels to monaural. As a result, one signal line between the adder circuit 351 and the
monitor fader 320 can be partially reduced. Therefore, also in this case, it is possible to further
simplify the apparatus configuration and reduce the manufacturing cost, in addition to achieving
the same function and effect as the first embodiment.
[0145]
Although the preferred embodiments of the present invention have been described in detail with
reference to the accompanying drawings, it goes without saying that the present invention is not
limited to such examples. It is obvious that those skilled in the art to which the present invention
09-05-2019
41
belongs can conceive of various changes or modifications within the scope of the technical idea
described in the claims. Of course, it is understood that these also fall within the technical scope
of the present invention.
[0146]
For example, in the above embodiment, the case where the external signal M is stereo has been
described. However, even in the case where the external signal M is monaural, this embodiment
can exhibit the same effects and the like. In this case, since it becomes difficult for the direction
specifying unit 21 to specify the transmission direction, for example, the channel of the output
signal O to which the external signal M is output is set in advance, such as the channel in the
direction in which the external signal M is obtained. You may leave it. Further, the above as in the
case outgoing direction in the first embodiment and the like is the front-rear direction, the output
signal OL of both channels, it is also possible to include external signal M analog in OR. In
addition to this case in an analog external signal M, is set in advance the channel include external
signal M both or either one, it is also possible provide the external signal M that does not
accordance with the originator direction it is, needless to say. Note that the changes described
here, the information signals IL was stereo, that the same applies to the IR I said in the above
embodiment.
[0147]
In the above embodiment, although the case has been described where the sound signal S is
supplied, if the audio signal S is not supplied, i.e. even a silent state, according to the abovedescribed exemplary embodiments headphone 1, it is possible to perform the same operation.
[0148]
Furthermore, in the above embodiment, the audio signal S, the external signal M, the information
signal IL, IR has been described the case where each is supplied as a digital signal.
However, any or all of these information may be supplied as an analog signal. In this case, omit
the digital / analog converter circuit 12, etc., by the construction of such each of the faders to an
analog circuit, it is possible to configure the headphones 1 and the like.
09-05-2019
42
[0149]
Then, in the above embodiment, FIG. 5, FIG. 11, as shown in FIG. 12 or the like, a structure for
adjusting the mix state of each signal in the output signal generation unit 100, 200, 300 has
been described when using the fader . However, Figure 5, structure 11, 12, by using that the
capable switches and amplifier circuits for performing the same operation, without using faders,
the output signal generation unit 100, 200 and 300 it is also possible to.
[0150]
The series of processes described in the above embodiments may be executed by dedicated
hardware or may be executed by software. When the series of processes by software, by
executing a program in a general-purpose or dedicated computer 900 shown in FIG. 13, it is
possible to realize the series of processes described above.
[0151]
Figure 13 is an explanatory diagram for explaining a configuration example of a computer 900
that realizes the series of processes by executing a program. To describe the execution by the
computer 900 of the program for performing the series of processes, as follows.
[0152]
As shown in FIG. 13, the computer, for example, a bus 901 and a bus 902, a bridge 903, a CPU
(Central Processing Unit) 904, a recording device, the input and output interfaces 907, an input
device 908, output device 909 When, having a connection port 910, a drive 912, a
communication device 914 and the like. Each of these configurations, and bus 901 and bus 902
are connected by a bridge 903, and is connected to the information to each other so as to be
transmitted via the output interface 907 or the like.
[0153]
Program, for example, is an example of a recording apparatus to record an HDD (Hard Disk
Drive) and an SSD (Solid State Drive) storage device 911 · ROM (Read Only Memory), such as a
09-05-2019
43
905 · RAM (Random Access Memory) 906, etc. kill leave.
[0154]
The program is, for example, a magnetic disk such as a flexible disk, a variety of CD (Compact
Disc) · MO (Magneto Optical) disc · DVD (Digital Versatile Disc) or the like of the optical disk,
removable storage medium 913 such as a semiconductor memory, a temporary it is also possible
to keep or permanent record.
The removable storage medium 913 can be provided as so-called package software. These
programs recorded on the removable storage medium 913 is read by the drive 912 may be
recorded on the recording device via the input-output interface 907 and buses 901 and 902 and
the like.
[0155]
Furthermore, the program, for example, may be recorded to the download site other computer
other recording apparatus or the like (not shown). In this case, the program, LAN via (Local Area
Network) · such as the Internet network 915 is transferred, the communication device 914
receives the program. The program may be transferred from the USB (Universal Serial Bus)
another recording device or communication device that is connected to the connection port 923,
such as such. Then, the program communication device 914 or the connection port 923 receives,
via the input-output interface 907 and buses 901 and 902, etc. may be recorded on the
recording device.
[0156]
Then, CPU 904 is, by executing various processes in accordance with programs recorded in the
recording device described above, the series of processes described above is realized. At this
time, CPU 904 may, for example, the program from the recording device described above, may
be performed by reading directly, or may be running on that once loaded into the RAM 905.
Furthermore CPU904, for example, when receiving via the communication device 914 or the
drive 912 the program may be executed directly without recording the received program in the
recording apparatus.
09-05-2019
44
[0157]
Further, CPU 904, if necessary, for example, a mouse keyboard microphone (not shown) and an
input device 908, such as various based on signals and information input from another input
device that is connected to the connection port 910 processing may be performed.
[0158]
Then, CPU 904 may output a result of executing the series of processes described above, for
example, from the output device 909 of the audio output device such as such as a display device,
a speaker or headphones, such as a monitor.
Furthermore CPU904, the processing result may be transmitted from the communication device
914 or the connection port 910, may be recorded on the recording device or the removable
storage medium 913 as needed.
[0159]
Incidentally, the step of herein described in the flowchart include not only processing performed
in time series along the order described, without being processed in a time series, in parallel or
individually executed It is also including the processing. Also in the chronological steps
processed it is needless to say cases can be changed as appropriate order.
[0160]
1 headphone 11 audio signal acquisition unit 12 a digital / analog converter circuit 13 amplifier
circuit 14 external signal acquisition portion 15 the information signal acquisition portion 20
controller 21 direction identification unit 22 the speech recognition unit 23 storage unit 24
timer 25 mode setting unit 26 fade control unit 100, 200, 300 output signal generation unit
101L, 101R equalizer 102L, 102R noise cancellation signal generation unit 103L, 103R external
sound extraction unit 111 volume adjustment fader 112 noise canceling adjustment fader 113
external signal adjustment fader 114 information signals for adjustment fader 120, 220, 320
monitor fader 130 cross fader 151,152,153,154,155,156,157,158 adder circuit 161,162,351
adder circuit CM mode switching signal Cont fade signal Dir direction signal M, ML, MR external
signal MM originator MS, MSL, MSR external sound O, OL, OR output signal OS, OSL, OSR output
09-05-2019
45
sound S, SL, SR audio signal SPL, SPR speaker U user
09-05-2019
46
Документ
Категория
Без категории
Просмотров
0
Размер файла
66 Кб
Теги
jp2010183451
1/--страниц
Пожаловаться на содержимое документа