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JP2008124789

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DESCRIPTION JP2008124789
A wireless headphone system for digitally modulating a stereo audio signal reproduced in an
audio reproducing device, transmitting the digital signal to a headphone device by wireless
communication (particularly, infrared communication), and outputting the audio, the left and
right wearing states of the headphone device The present invention provides a wireless
headphone system that can recognize and automatically switch L / R channels for audio output,
and can realize high-quality audio output. In a wireless headphone system, a headphone device
determines a mounting direction of the headphone device based on an error rate of a wireless
signal detected by an error detection unit, and digital demodulation is performed according to
the determined mounting direction. Stereo audio obtained by demodulating the radio signal with
the lower error rate based on the error rate while setting the output destination (first or second
audio output unit) of each of the left and right voice signals The signal is output to the first or
second audio output unit. [Selected figure] Figure 5
ワイヤレスヘッドホンシステム
[0001]
The present invention digitally modulates a stereo audio signal including left and right audio, and
transmits an audio signal transmitter that transmits the modulated signal by wireless
communication, and receives a signal wirelessly transmitted from the audio signal transmitter.
And a headphone device for outputting a digitally demodulated stereo audio signal to an audio
output unit.
[0002]
10-05-2019
1
Conventionally, wireless headphones capable of receiving stereo audio signals from an audio
reproduction device such as a CD player by wireless communication are known (for example,
Patent Documents 2 and 3).
According to this wireless headphone, there is an advantage that the listener is not restricted in
movement, since it does not need a troublesome code to connect with the audio reproduction
device.
[0003]
In general, stereo headphones corresponding to the L / R 2-channel stereo audio output have to
have the right and left mounting directions determined, so it is necessary to properly align the
left and right directions at the time of mounting. However, in the headphones whose left and
right are symmetrical or nearly symmetrical, the distinction between the left and right is difficult
to recognize at first glance, and there is an inconvenience that the left and right marks must be
confirmed before wearing.
[0004]
Therefore, in Patent Document 1, a reception unit capable of receiving a detection signal
transmitted from an audio transmission device (rear display unit) is provided before and after
one speaker (audio output unit) of the wireless headphone, and the received detection signal A
wireless headphone system has been proposed in which the left and right wearing states of the
headphones are recognized by comparing the strengths of the two, and the L / R channel to be
output is automatically switched. Further, as a detection signal, it is disclosed that infrared rays
or light may be used in addition to radio waves.
[0005]
JP 2005-333428 JP JP 7-327300 JP JP 2005-286919
[0006]
10-05-2019
2
However, in the wireless headphone system described in Patent Document 1, the receiving unit
of the detection signal for determining the wearing state of the headphones is provided
separately from the audio signal receiving unit, so that the configuration becomes complicated.
There is.
In addition, since there is only one audio signal receiving unit, there is a problem that the sound
quality output from the speaker of the headphone is deteriorated when the reception state is
deteriorated due to the state of the transmission path.
[0007]
In addition, in a wireless headphone system using infrared communication, in order to widen the
range in which infrared signals can be received, generally, a headphone device is provided with a
plurality of infrared light receiving units. However, since the infrared signals received by the
plurality of infrared light receiving units are combined and then demodulated and output as
voice, if an infrared light receiving unit receives noise or an error-uncorrectable signal, the signal
is demodulated. As a result, there is a risk that the quality of the voice output will be degraded. In
addition, in order to simplify a circuit structure conventionally, after synthesize | combining the
received infrared signal, it is thought that it is demodulating.
[0008]
The present invention digitally modulates a stereo audio signal reproduced in an audio
reproduction device, transmits this to a headphone device by wireless communication (in
particular, infrared communication), and outputs the sound in a wireless headphone system. It is
an object of the present invention to provide a wireless headphone system that can automatically
switch L / R channels for voice output and can realize high-quality voice output.
[0009]
The present invention has been made to achieve the above object, and an audio signal
transmitting apparatus for digitally modulating a stereo audio signal including left and right
audio and transmitting the modulated signal by wireless communication, and the audio signal A
headphone device for receiving a signal wirelessly transmitted from a transmission device and
outputting a digitally demodulated stereo audio signal from a first audio output unit or a second
audio output unit, the headphone system comprising: The apparatus is provided at at least two
locations (for example, one of the left and right side speakers) and is provided with a wireless
signal receiving unit capable of receiving a wireless signal from the audio signal transmitting
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3
apparatus, and the plurality of wireless signal receiving units. Error detection means for detecting
an error rate when the received radio signal is digitally demodulated, and detection by the error
detection means Mounting direction determination means for determining the mounting
direction of the headphone device based on the selected error rate, and outputs of the left and
right audio signals digitally demodulated according to the mounting direction determined by the
mounting direction determination means Among the wireless signals received by the plurality of
wireless signal receiving units, based on the output destination setting unit for setting a
destination (first or second audio output unit) and the error rate detected by the error detection
unit And output signal selection means for outputting the left and right audio signals obtained by
demodulating the radio signal with the lowest error rate to the set output destination.
[0010]
For example, when the shapes of the left and right audio output units (speakers) of the
headphone device are the same, the distinction between the left and right is difficult to recognize
at first glance, but the present invention eliminates the need to distinguish and attach the left and
right audio output units.
[0011]
Further, the wireless signal receiving unit is a first wireless signal receiving unit provided at a
position where the wireless signal from the front of the listener is mainly received when the
listener wears the headphones, and a wireless signal from the rear of the listener And a second
wireless signal receiver provided at a position where the signal is mainly received.
Thereby, when the listener wears the headphone device, it can be determined with certainty
which radio signal receiving unit is facing the audio signal transmitting device side, so that the
wearing direction can be accurately determined.
[0012]
For example, when wireless signal receiving units are provided before and after the first audio
output unit, if it is determined that the first wireless signal receiving unit is ahead (on the audio
signal transmitting device side) (for example, the first wireless If the error rate of the wireless
signal from the signal receiving unit is low, the left audio is output from the first audio output
unit, and the right audio is output from the second audio output unit, Conversely, when the
second wireless signal receiving unit is determined to be forward (for example, when the error
rate of the infrared signal from the second wireless signal receiving unit is low), the voice on the
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4
left side from the second voice output unit is conversely It is sufficient to set so that the signal is
output and the first audio output unit outputs the right audio signal.
[0013]
Further, the wireless signal is an infrared signal.
Thereby, in the wireless signal receiving unit (infrared light receiving unit), it becomes difficult to
receive the infrared signal from other than the light receiving direction, so the difference in error
rate of the received infrared signal becomes remarkable, and the wearing direction of the
headphone device It can be determined accurately.
[0014]
Furthermore, the attachment direction determination means determines the attachment direction
of the headphone device based on an error rate of the wireless signal received within a
predetermined time, and the output destination setting means is determined by the attachment
direction determination means. The first and second audio output units to which the digital
demodulated left and right audio signals are respectively output are set in accordance with the
mounting direction, and the predetermined operation is performed (for example, in the
headphone device) This setting is maintained until the power is turned off.
For example, a wearing detection unit is provided for detecting that the listener wears the
headphone device, and the headphone device is powered on based on the wearing of the
headphone device, and the wearing direction is set after a predetermined time after wearing. It is
desirable to judge automatically.
[0015]
As a result, after the output destination (first or second audio output unit) is set based on the
mounting direction of the headphone device, the listener moves the place and the like, and the
respective wireless signal reception units receive the signal. Even if the error rate of the received
signal changes, the set mounting direction will not be changed.
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5
On the other hand, since the audio signal output to the audio output unit is always an audio
signal obtained by demodulating a signal with a low error rate, high sound quality can be
maintained.
[0016]
The apparatus further comprises signal level detection means for detecting the signal levels
(reception strengths) of the wireless signals received by the plurality of wireless signal reception
units, wherein the mounting direction determination means includes the error rate detected by
the error detection means and The mounting direction of the headphone device is determined
based on the signal level detected by the signal level detection means. Thereby, since the
superiority or inferiority of the received wireless signal becomes remarkable, the determination
accuracy of the mounting direction of the headphone device can be improved.
[0017]
According to the present invention, in the wireless headphone system, the headphone device
determines and determines the mounting direction (left and right) of the headphone device based
on the error rate of the wireless signal (infrared signal) detected by the error detecting means.
While setting the output destinations (first or second audio output unit) of the digitally
demodulated left and right audio signals according to the mounting orientation, the wireless
signal having the lowest error rate based on the error rate The stereo audio signal (right and left
audio signals) obtained by demodulating the signal is output to the set output destination, so that
it is possible to attach without distinguishing the left and right of the headphone device, and
high-quality sound from the audio output unit Can be output.
[0018]
For example, even if the wireless signal received by one wireless signal receiving unit is not
error-correctable, a stereo audio signal obtained by demodulating the wireless signal received by
another wireless signal receiving unit is output. As a result (the plurality of received wireless
signals are not synthesized), the sound quality output from the audio output unit does not
deteriorate.
[0019]
10-05-2019
6
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
FIG. 1 is a schematic block diagram of a wireless headphone system according to the present
invention, and FIG. 2 is a perspective view of a headphone device 20 constituting the wireless
headphone system according to the present invention.
The wireless headphone system according to the present embodiment includes an audio signal
transmission device 10 connected to an audio reproduction device 30 such as a CD player, and a
headphone device 20.
[0020]
The audio signal transmission device 10 digitally modulates a stereo audio signal (audio signals
on the left and right) output from the audio reproduction device 30, and transmits the modulated
signal to the headphone device 20 by infrared communication.
[0021]
On the other hand, the headphone device 20 receives an infrared signal transmitted from the
audio signal transmission device 10, and outputs a stereo audio signal obtained by digital
demodulation of the infrared signal to the first audio output unit or the second audio output unit.
In the following description, the left speaker 26L in FIGS. 1 and 2 is a first audio output unit, and
the right speaker 26R is a second audio output unit.
[0022]
The first sound output unit 26L and the second sound output unit 26R have a shape that can be
attached to either the left ear or the right ear.
[0023]
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7
The headphone device 20 further includes an infrared light receiving unit 21 as a wireless signal
receiving unit that receives an infrared signal from the audio signal transmission device 10.
The infrared light receiving unit 21 includes, for example, a first infrared light receiving element
(first wireless signal receiving unit) 21 a and a second infrared light receiving element (second
wireless signal receiving unit) 21 b on the top and bottom surfaces of a cylindrical body. It is
horizontally disposed above the second sound output unit 26R so that it can mainly receive
infrared signals from the front and back of the listener when the listener wears the headphone
device 20. The infrared light receiving unit 21 may be disposed above the first sound output unit
26L.
[0024]
Next, specific configurations of the audio signal transmission device 10 and the headphone
device 20 constituting the wireless headphone system of the present embodiment will be
described. FIG. 3 is a block diagram of the audio signal transmitting apparatus 10. As shown in
FIG. 3, the audio signal transmission device 10 includes audio signal input terminals 15 L and 15
R capable of inputting a stereo audio signal from the audio reproduction device 30, an A / D
converter 14, and a digital modulator 13. A driver amplifier 12 and an infrared light emitting
element 11 are provided.
[0025]
The L / R stereo audio signal from the audio reproduction device 30 is input to the audio signal
transmission device 10 through the audio signal input terminals 15L and 15R, and is digitally
converted in the A / D conversion unit 14. The digital audio signal subjected to digital conversion
is subjected to predetermined digital modulation processing in the digital modulation unit 13,
and the modulated signal is amplified by the driver amplifier 12 and transmitted from the
infrared light emitting element 11 to the headphone device 20.
[0026]
FIG. 4 is a block diagram of the headphone device 20. As shown in FIG. As shown in FIG. 4, the
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8
headphone device 20 includes the first and second infrared light receiving elements 21a and
21b, the I / V conversion amplifiers 22a and 22b, the digital demodulation unit 23, the
microcomputer 24, and the D / A conversion. And a first audio output unit 26L and a second
audio output unit 26R.
[0027]
The infrared signals received by the infrared light receiving elements 21a and 21b are amplified
by the I / V conversion amplifiers 22a and 22b, and subjected to predetermined digital
demodulation processing by the digital demodulation unit 23. The demodulated L / R stereo
audio signal is separated into left and right audio signals L and R in the D / A converter 25 and
analog converted, and then the first audio output 26L and the second audio output 26R Output
from
[0028]
The microcomputer 24 detects an error rate when the digital demodulation unit 23 digitally
demodulates the two infrared signals received by the first and second infrared light receiving
elements 21a and 21b (error detection means). And based on the detected error rate, the
mounting direction of the said headphone apparatus 20 is determined (mounting direction
determination means). Furthermore, signal levels of the two infrared signals received by the first
and second infrared light receiving elements 21a and 21b are detected (signal level detecting
means), and based on the detected error rate and the signal level, The determination accuracy
can be improved by determining the mounting direction of the headphone device 20.
[0029]
Further, the microcomputer 24 determines which of the audio output units 26L and 26R the
digital demodulated left and right audio signals L and R are to be output in accordance with the
mounting direction of the headphone device 20, and sets the output destination ( Output
destination setting means).
[0030]
Furthermore, the microcomputer 24 selects, based on the error rate of the infrared signal, the
stereo audio signal based on the infrared signal of the lower error rate among the two infrared
signals received by the infrared light receiving elements 21a and 21b. Output to the audio output
10-05-2019
9
unit 2 (output signal selection means).
[0031]
FIG. 5 is a flowchart showing an audio output process performed by the headphone device 20.
The determination of the wearing state (wearing direction) of the headphone device 20 is
performed in a state where the listener wears the headphone device 20 and faces the audio
signal transmitting device 10.
That is, the error rate is lower for the infrared signal received by the infrared light receiving unit
facing the audio signal transmitting device.
[0032]
First, in step S101, it is determined whether the headphone device 20 is powered on. When it is
determined that the headphone device 20 is powered on, the process proceeds to step S102, and
when it is determined that the headphone device 20 is not powered on, the process ends. When
the listener wears the headphone device, the power may be automatically turned on.
[0033]
Next, it is determined whether the infrared signals transmitted from the audio signal transmitting
device 10 have been received by the first and second infrared light receiving elements 21a and
21b (step S102). Then, when it is determined that the infrared signal is received, the process
proceeds to step S103, and when it is determined that the infrared signal is not received (for
example, the power of the audio signal transmitting apparatus is not turned on), the process is
ended as it is. .
[0034]
Next, in step S103, the error rates of the respective infrared signals received by the first and
second infrared light receiving elements 21a and 21b are acquired, and it is determined which
10-05-2019
10
error rate of the infrared signals is low (step S104).
[0035]
When it is determined in step S104 that the error rate of the infrared signal received by the first
infrared light receiving element 21a is low, the left audio signal L is output to the first audio
output unit (left speaker) 26L. Then, the right audio signal R is set to be output to the second
audio output unit (right speaker) 26R (step S105).
That is, the fact that the error rate of the infrared signal received by the first infrared light
receiving element 21a is low means that the first infrared light receiving element 21a faces the
audio signal transmitting device 10 side. The second audio output unit 26R is attached to the left
ear and the second audio output unit 26R is attached to the right ear.
[0036]
Then, stereo audio signals L and R obtained by demodulating an infrared signal with a low error
rate received by the first infrared light receiving element 21a are output to the set audio output
units 26L and 26R.
[0037]
On the other hand, when it is determined in step S104 that the error rate of the infrared signal
received by the second infrared light receiving element 21b is low, the right audio signal R is
output to the first audio output unit (left speaker) 26L. And the left audio signal L is output to the
second audio output unit (right speaker) 26R (step S107).
That is, the fact that the error rate of the infrared signal received by the second infrared light
receiving element 21 b is low means that the second infrared light receiving element 21 b faces
the audio signal transmitting device 10 side, so the second The audio output unit 26R is attached
to the left ear, and the first audio output unit 26L is attached to the right ear.
[0038]
Then, stereo audio signals L and R based on the infrared signal with a low error rate received by
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11
the second infrared light receiving element 21b are output to the set audio output units 26L and
26R.
[0039]
As described above, in the present embodiment, the mounting direction (left and right) of the
headphone device 20 is determined based on the error rate of the infrared signal received when
the headphone device 20 is powered on, and the mounting direction of the headphone device 20
is determined. Thus, it is determined which of the first and second audio output units 26L and
26R the output destination of the left and right audio signals is to be used.
In addition, it is desirable that this setting be held until a predetermined operation is performed
(for example, until the power of the headphone device is turned off).
[0040]
As a result, after the output destination (first or second audio output unit) is set based on the
mounting direction of the headphone device 20, the listener moves the place, and the reception
state by the infrared light receiving elements 21a and 21b. Even if the (error rate) is reversed, the
output destinations (first or second audio output units 26L and 26R) of the left and right audio
signals are not changed.
[0041]
On the other hand, since the audio signals output from the audio output units 26L and 26R
always have a low error rate, high sound quality can be maintained.
The audio output (steps S106 and S108) in the flow chart of FIG. 5 shows the case where the
headphone device is powered on, and thereafter, an infrared signal with a low error rate is
selected, and this is demodulated The resulting voice is output.
[0042]
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12
As described above, in the wireless headphone system of the present embodiment, the
headphone device 20 determines the mounting direction (left and right) of the headphone device
20 based on the error rate of the infrared signal received by the infrared light receiving units 21a
and 21b. Output destinations (first or second audio output units) of the digitally demodulated left
and right audio signals are set in accordance with the determined mounting orientation. Also,
based on the error rate of the infrared signal received by the infrared light receiving units 21a
and 21b, the stereo audio signal (audio signal on the left and right) obtained by demodulating the
infrared signal with the lower error rate is set as the output destination Output. As a result, the
audio output units 26L and 26R of the headphone device 20 can be mounted without distinction
between the left and right, and high-quality audio can be output from the audio output units 26L
and 26R.
[0043]
As mentioned above, although the invention made by the present inventor was concretely
explained based on an embodiment, the present invention is not limited to the above-mentioned
embodiment, and can be changed in the range which does not deviate from the gist.
[0044]
For example, in the above embodiment, the mounting direction of the headphone device 20 is
determined based on the error rate of the infrared signal received by the infrared light receiving
unit 21. However, not only the error rate of the infrared signal but also the signal level ( The
mounting direction of the headphone device may be determined with reference to the received
signal strength).
Generally, the lower the error rate of the infrared signal, the higher the signal level should be.
Thereby, since the superiority or inferiority of the received wireless signal becomes remarkable,
the determination accuracy of the mounting direction of the headphone device can be improved.
[0045]
Further, in the above embodiment, the headphone device 20 is configured to be provided with
two infrared light receiving elements 21a and 21b capable of receiving infrared signals from the
front and the rear, but an infrared light receiving element is further provided It is also good. For
example, it can be provided on the side surface of the audio output units 26L, 26R. As a result,
10-05-2019
13
even when the listener moves and, for example, becomes perpendicular to the audio signal
transmitting apparatus 10, the infrared signal can be received with high sensitivity, so high
sound quality can be maintained. Even in this case, the mounting direction of the headphone
device 20 may be determined based on the infrared signals from the first and second infrared
light receiving elements.
[0046]
Furthermore, in the above embodiment, the stereo sound signal is transmitted to the headphone
device 20 using infrared communication, but general wireless communication such as radio
waves can also be used. However, if infrared communication is used, it is difficult to receive an
infrared signal from other than the light receiving direction, and the difference in error rate of
the received infrared signal becomes remarkable. Therefore, in order to accurately determine the
mounting direction of the headphone device Is considered to be more suitable for infrared
communication.
[0047]
In addition to the analog signal, an audio digital signal may be input to the audio signal input
from the audio reproduction device 30 to the audio signal transmission device 10.
[0048]
It is a schematic block diagram of the wireless headphone system concerning the present
invention.
FIG. 2 is a perspective view of the headphone device 20. FIG. 2 is a block diagram of an audio
signal transmission device 10; FIG. 2 is a block diagram of a headphone device 20. FIG. 6 is a
flowchart showing an audio output process performed by the headphone device 20. FIG.
Explanation of sign
[0049]
20 headphone device 21 infrared light receiving unit (wireless signal receiving unit) 21a first
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14
infrared light receiving device (first wireless signal receiving unit) 21b second infrared light
receiving device (second wireless signal receiving unit) 22a, 22b I / V conversion amplifier 23
digital demodulation unit 24 microcomputer (error detection unit, mounting direction
determination unit, output destination setting unit, output signal selection unit) 25 D / A
conversion unit 26L first voice output unit 26R second voice output unit
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