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DESCRIPTION JP2008244852

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DESCRIPTION JP2008244852
PROBLEM TO BE SOLVED: To provide an audio reproduction device and an audio reproduction
method capable of transmitting and receiving voice with less noise. SOLUTION: A communication
unit for transmitting and receiving signals; at least one sound output unit for outputting sound
based on a received signal received by the communication unit; and a noise control unit for noise
generation to generate voice data; communication When an echo signal is included in the
received signal received by the unit, an echo canceler unit that stores the echo signal and
generates a pseudo echo signal using the stored echo signal; A noise reduction unit that
generates a cancellation signal that cancels the noise using voice data when the noise generated
from the source is included, and combines and outputs the output signal of the echo canceller
unit and the cancellation signal; A sound reproducing apparatus is provided, characterized in that
it comprises: [Selected figure] Figure 1
Sound reproduction apparatus and sound reproduction method
[0001]
The present invention relates to an audio reproduction apparatus and an audio reproduction
method, and more particularly, an audio reproduction apparatus and audio reproduction method
capable of preventing noise from mixing in the voice reaching the other party and reducing
ambient noise to hear the voice. About.
[0002]
There is a sound reproduction device that exchanges voices wirelessly or by wire.
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Such a sound reproducing apparatus has a function of transmitting and receiving an audio signal,
and can exchange audio with the other party at a distant place.
[0003]
Such a sound reproducing apparatus transmits sound to the other party by providing a means for
reducing noise included in the voice that is stuttered after stuttering the voice in order to prevent
noise from being mixed into the voice reaching the other party. Was. For example, Patent
Document 1 discloses such a technique.
[0004]
JP-A-2-231899
[0005]
However, only the device for reducing noise is mounted on the input side of the voice input in
the sound reproduction device that exchanges the voice so far, and it becomes difficult to hear
the sound from the other party in an environment where noise is mixed There was a problem
that.
In addition, in a situation where noise is mixed and it is difficult to hear the sound from the other
party, the voice of the conversation becomes louder naturally, and there is also a problem that
the surroundings are disturbed.
[0006]
Therefore, the present invention has been made in view of the above problems, and an object of
the present invention is to provide means for reducing noise on the input side for inputting voice
and also for the output side for outputting sound. It is an object of the present invention to
provide a new and improved sound reproduction apparatus and method that can transmit and
receive noise-reduced sound by reducing noise.
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[0007]
To solve the above problems, according to one aspect of the present invention, there is provided
a communication unit that transmits and receives signals; at least one sound output unit that
outputs sound based on a received signal received by the communication unit; A hooking unit
that throbs to generate voice data; and an echo signal that is stored in the received signal
received by the communication unit when the echo signal is included and that generates a
pseudo echo signal using the stored echo signal If the noise generated by the noise source is
included in the noise generated by the noise reduction unit and the noise reduction unit, a
cancellation signal for canceling the noise is generated using the voice data, and the output
signal of the echo cancellation unit is canceled. A sound reproducing apparatus is provided,
comprising: a noise reduction unit that combines the signal with a signal and outputs the signal.
[0008]
According to this configuration, the communication unit transmits and receives signals, the
sound output unit outputs sound based on the received signal received by the communication
unit, and the echo canceller unit includes an echo signal in the received signal received by the
communication unit. The echo signal is stored, and the echo signal is used to generate a pseudo
echo signal, and the noise reduction unit includes the noise generated from the noise source in
the noise generated by the noise reduction unit. In this case, the voice data is used to generate a
cancellation signal for canceling noise, and the output signal of the echo canceller unit and the
cancellation signal are synthesized and output.
As a result, by providing means for reducing noise on the input side for inputting voice and
reducing noise on the output side for outputting sound, it is possible to transmit and receive the
noise reduced noise.
[0009]
The sound reproduction apparatus further includes a call detection unit that detects the start of a
call, the call detection unit outputs a predetermined signal to the noise reduction unit when the
start of the call is detected, and the noise reduction unit is a call detection unit. When a
predetermined signal from is input, the band may be limited and a cancellation signal may be
generated.
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According to this configuration, the call detection unit outputs a predetermined signal to the
noise reduction unit when it detects the start of a call, and the noise reduction unit limits the
band when the predetermined signal from the call detection unit is input. And generate a
cancellation signal. As a result, by detecting the start of the call and limiting the band and
generating the cancellation signal, the voice band is canceled, and not only the noise but also the
voice of the other party becomes smaller, making it difficult to make a call. You can prevent that.
[0010]
The sound reproducing apparatus may further include a first equalizer that receives an output
from the communication unit, performs equalizer processing on a predetermined frequency
band, and outputs the processed signal to the echo canceller unit. According to this
configuration, the first equalizer performs equalizer processing on a predetermined frequency
band and outputs the result to the echo canceller unit. As a result, even if noise is removed by the
noise reduction unit, it is possible to maintain the waveform of the sound that you want the
person using the sound reproduction device to hear.
[0011]
The sound reproducing apparatus may further include a second equalizer which receives an
output from the echo canceller unit, cuts a low frequency band, and outputs the cut signal to the
communication unit. According to this configuration, the second equalizer cuts the low frequency
band and outputs it to the communication unit. As a result, by cutting the low frequency part,
noise in the low frequency part can be prevented from being transmitted to the other party.
[0012]
The sound reproduction apparatus may further include a housing that covers the sound output
unit, and the noise generation unit may be provided inside the housing. According to such a
configuration, the housing covers the sound output unit, and the whistling portion is provided
inside the housing covering the sound output unit. As a result, the noise reduction unit generates
a cancellation signal that cancels the noise that reaches the inside of the housing by noisegenerating the noise output from the noise source and the sound output from the sound output
unit by the noise reduction unit. it can.
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[0013]
The sound reproduction apparatus may further include a housing that covers the sound output
unit, and the noise generation unit may be provided outside the housing. According to such a
configuration, the housing covers the sound output unit, and the mastication unit is provided
outside the housing covering the sound output unit. As a result, the noise reduction unit can
generate a cancellation signal that cancels the noise that reaches the inside of the housing by
noise-generating the noise output from the noise source by the noise reduction unit.
[0014]
The above-mentioned sound reproduction device may further include a bone conduction sound
and noise part which roars the bone conduction sound by bone conduction. According to such a
configuration, the bone conduction sound stuttering part roars the bone conduction sound due to
the bone conduction. As a result, the vibration of the vocal cords transmitted through the bone
can be converted into a speech signal.
[0015]
The number of sound output units may be one. As a result, one ear can hear the voice from the
other party.
[0016]
In order to solve the above problems, according to another aspect of the present invention, there
is provided a communication step of transmitting and receiving a signal; an acoustic output step
of outputting a sound based on a received signal received in the communication step; If an echo
signal is included in the received signal, the echo signal is stored, and the echo signal is
attenuated to generate a pseudo echo signal using the echo signal stored so as to prevent the
echo signal from returning to the transmission side. The pseudo echo signal generation step; the
stuttering step for stuttering the sound to generate voice data; and the sound stuttered in the
stuttering step includes noise generated from the noise source, using the voice data to generate
noise. A sound reproduction method is provided, comprising: a cancellation signal generation
step of generating a cancellation cancellation signal.
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[0017]
According to this configuration, the communication step transmits and receives signals, the
sound output step outputs sound based on the received signal received in the communication
step, and the pseudo echo signal generation step echoes the received signal received in the
communication step The echo signal is stored using an echo signal that stores an echo signal and
stores a pseudo echo signal that attenuates the echo signal to prevent the echo signal from
returning to the transmission side, and the mastication step generates a sound. The cancellation
signal generation step generates a cancellation signal that cancels the noise using the voice data
if the noise generated by the noise source is included in the noise generated by the noise
generation step. Do.
As a result, by reducing the noise contained in the input voice and reducing the noise from the
noise source reaching the ear when listening to the output sound, it is possible to transmit and
receive the noise reduced noise. .
[0018]
As described above, according to the present invention, it is possible to transmit and receive
sound with less noise by providing means for reducing noise on the input side for inputting voice
and reducing noise on the output side for outputting sound. It is possible to provide a new and
improved sound reproduction device and sound reproduction method.
[0019]
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.
[0020]
First Embodiment First, an audio reproduction apparatus and an audio reproduction method
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according to a first embodiment of the present invention will be described.
[0021]
FIG. 1 is an explanatory view for explaining an outline of a sound reproducing apparatus 10
according to a first embodiment of the present invention.
FIG. 1 shows a sound reproducing apparatus 10 used for the head of the speaker 1. Hereinafter,
an outline of the sound reproducing apparatus 10 according to the first embodiment of the
present invention will be described with reference to FIG.
[0022]
The sound reproducing apparatus 10 wirelessly transmits / receives audio data to / from a called
party by the antenna 102 and reproduces music. The voice data sent from the other party of
communication is received by the antenna 102, data processing is performed on the voice data
inside the sound reproduction device 10, and voices are output from a speaker disposed inside
the housing 116.
[0023]
On the other hand, the voice uttered by the speaker 1 is voiced by a microphone disposed inside
the housing 116, and data processing is performed on the voice uttered inside the sound
reproduction device 10 to become voice data, and a call is made from the antenna 102 through
space. It is wirelessly sent to the other party.
[0024]
Thus, conversation with the other party can be performed by the antenna 102 and the
microphone disposed inside the housing 116.
However, the sound reproducing apparatus 10 is often used in an environment where noise from
noise sources is mixed. The environment in which noises are mixed is, for example, a road with
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many streets, or a store with many visitors, for example. In an environment where such noise is
mixed, not only the voice from the other party is not only difficult to hear due to the noise, but
also the voice from the speaker 1 is mixed with the noise, and it becomes difficult for the other
party to hear the voice of the speaker 1 There was a problem.
[0025]
Therefore, in the first embodiment of the present invention, a sound reproducing apparatus
capable of smoothly performing conversation with the other party by reducing not only the voice
from the other party but also the noise mixed in with the user's speaking voice. And the sound
reproduction method will be described.
[0026]
Although the sound reproducing apparatus 10 shown in FIG. 1 is used by hanging on the head of
the speaker 1, it goes without saying that the structure of the sound reproducing apparatus 10 is
not limited to the example shown in FIG. There is also no.
[0027]
The outline of the sound reproducing apparatus 10 according to the first embodiment of the
present invention has been described above with reference to FIG.
Next, the configuration of the sound reproduction device 10 according to the first embodiment of
the present invention will be described.
[0028]
FIG. 2 is an explanatory view for explaining the configuration of the sound reproduction
apparatus 10 according to the first embodiment of the present invention.
Hereinafter, the configuration of the sound reproducing apparatus 10 according to the first
embodiment of the present invention will be described with reference to FIG.
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[0029]
As shown in FIG. 2, the sound reproducing apparatus 10 according to the first embodiment of the
present invention includes an antenna 102, a wireless communication unit 104, a call detection
unit 106, equalizers (EQ) 108a and 108b, and an echo. A canceller 110, a noise canceling system
112, a first amplifier 114, a housing 116, and a second amplifier 122 are included. The housing
116 is configured to include the speaker 118 and the microphone 120.
[0030]
The antenna 102 transmits and receives radio waves. Radio waves are transmitted or received by
emitting radio waves into the air through the antenna 102 or by receiving the emitted radio
waves, and by exchanging radio waves, voice can be exchanged with the other party. The radio
wave received by the antenna 102 is input to the wireless communication unit 104.
[0031]
The wireless communication unit 104 demodulates the radio wave received by the antenna 102
to generate voice data of the other party, or modulates the voice data of the speaker 1 using the
sound reproducing apparatus 10 and transmits the radio wave to be transmitted by the antenna
102. It is something to generate. Although voice data is transmitted and received wirelessly in
the present embodiment, the present invention is not limited to this, and voice data may be
transmitted and received by wire.
[0032]
Note that the radio wave decoding process performed by the wireless communication unit 104
depends on the communication protocol between the sound reproducing devices 10, and is not
limited to a specific decoding process, and is a design item that can be determined arbitrarily. .
[0033]
The call detection unit 106 detects the start of a call by the sound reproduction device 10.
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When a radio wave from the other party is received by the antenna 102 and the radio
communication unit 104 demodulates the radio wave in a state where a call is not being made,
the call detection unit 106 detects the start of the call and a predetermined signal is detected.
Output. In the present embodiment, when the call detection unit 106 detects the start of a call, a
signal is sent to the noise canceling system 112 to operate the start of the call to the noise
canceling system 112. The call detection unit 106 may be any device that outputs a signal
according to the input if a predetermined signal is input. For example, when a signal of a
predetermined level is input, the signal may be input according to the input of the signal. The
circuit can be configured to output a predetermined signal. The operation of the call detection
unit 106 will be described in detail later.
[0034]
The equalizer 108 a is an example of a first equalizer according to the present invention, and the
voice data received by the antenna 102 and modulated by the wireless communication unit 104
is changed in frequency characteristics of a specific frequency range and changed. Data is input
to the echo canceller 110. By changing the frequency characteristic of the specific frequency
range by the equalizer 108a, even if the noise canceling system 112 removes the noise, it is
possible to maintain the waveform of the sound desired to be heard by the speaker 1 to a certain
extent.
[0035]
Similarly, the equalizer 108 b is an example of the second equalizer according to the present
invention, and the voice data of the speaker 1 voice data output from the echo canceller 110 is
changed by changing the frequency characteristic of a specific frequency range. Are input to the
wireless communication unit 104. The frequency characteristics to be changed by the equalizers
108a and 108b will be described in detail later.
[0036]
When the voice data received by the wireless communication unit 104 includes an echo signal,
the echo canceller 110 stores the echo signal and subtracts the stored echo signal to attenuate
the echo signal and transmit it to the transmission side. It generates pseudo echo signals that
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prevent the return. The operation principle of the echo canceller 110 will be briefly described.
Although not shown here, the echo canceller 110 is provided with, for example, an adaptive filter,
and a convolution operation is performed on the received signal from the other party using the
adaptive filter. Do. By performing the convolution operation, the echo canceller 110 can generate
a pseudo echo signal and can prevent transmission of the echo signal to the other side.
[0037]
In the present embodiment, when an echo signal is included in the audio signal input from the
equalizer 108a, the echo signal is temporarily stored, and the echo signal stored from the audio
signal input from the second amplifier 122 is stored. Subtract. Thus, by removing the echo signal
by the echo canceller 110, it is possible to remove the echo signal component in which a part of
the reception voice signal gets around in the transmission voice signal, and to prevent the voice
quality from being deteriorated.
[0038]
The noise canceling system 112 is an example of the noise reduction unit of the present
invention. The noise canceling system 112 generates a cancellation signal that cancels out the
noise generated by the noise source when the noise generated by the noise source is included in
the noise generated by the microphone 120 and generates an output signal from the microphone
120 The cancellation signal is synthesized to reduce the noise from the sound output from the
speaker 118. An output signal from the noise canceling system 112 is input to a first amplifier
114. The cancellation signal generated by the noise canceling system 112 will be described in
detail later.
[0039]
The first amplifier 114 receives an output signal from the noise canceling system 112, amplifies
it by an arbitrary amplification amount, and outputs it. The amplification amount to be amplified
by the first amplifier 114 is a design item that can be arbitrarily set according to the
characteristics of the speaker 118, and is not limited to a specific amplification amount in the
present invention. The signal amplified by the first amplifier 114 is input to the speaker 118.
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[0040]
The speaker 118 vibrates the built-in diaphragm (not shown) based on the input signal when the
signal from the first amplifier 114 is input, and outputs sound by vibrating the diaphragm. It is.
The microphone 120 is an example of the mastication part of the present invention. The
microphone 120 stutters the voice output from the speaker 118 and the voice emitted from the
mouth of the speaker 1, converts the stuttered voice into voice data, and inputs the converted
voice data to the second amplifier 122 It is.
[0041]
The second amplifier 122 is for inputting the audio data beaten by the microphone 120,
amplifying it by an arbitrary amplification amount and outputting it. The amount of amplification
amplified by the second amplifier 122 is a design matter, and is not limited to a specific amount
of amplification. The signal amplified by the second amplifier 122 is input to the echo canceller
110 and the noise canceling system 112.
[0042]
The configuration of the sound reproduction device 10 according to the first embodiment of the
present invention has been described above with reference to FIG. Next, the configuration of the
noise canceling system 112 according to the first embodiment of the present invention will be
described.
[0043]
FIG. 3 is an explanatory view illustrating the configuration of the noise canceling system 112
according to the first embodiment of the present invention. The configuration of the noise
canceling system 112 according to the first embodiment of the present invention will be
described below using FIG.
[0044]
As shown in FIG. 3, the noise canceling system 112 according to the first embodiment of the
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present invention is configured to include a first filter 124, a second filter 126, and a switch 128.
[0045]
The first filter 124 and the second filter 126 cancel noise having a phase opposite to that of the
voice data in order to cancel noise with respect to the voice data which is noised by the
microphone 120 and amplified by the second amplifier 122. Signal generation and output.
Here, the difference between the first filter 124 and the second filter 126 is that the first filter
124 generates a cancellation signal for all frequency bands, whereas the second filter 126 is a
human being. It is where the cancellation signal is generated for the frequency band other than
the emitting voice.
[0046]
FIG. 4 is an explanatory view for explaining an outline of a noise canceling system for reducing
noise. FIG. 4A schematically shows frequency characteristics of noise emitted from the noise
source. When such noise is emitted from a noise source, a signal having a phase opposite to the
noise as shown in FIG. 4B is generated to cancel the noise. Then, by combining the waveform
shown in (a) of FIG. 4 and the waveform shown in (b) in space, it becomes possible to obtain a
flat waveform as shown in (c) of FIG. Noise can be canceled out.
[0047]
Switching between the first filter 124 and the second filter 126 is performed by the switch 128.
The switch 128 is switched by the output signal from the call detection unit 106 shown in FIG.
Normally, the switch 128 is connected to the first filter 124 side to cancel the noise, and when
the microphone 120 beats the noise, the voice data including the noise is input to the first filter
124, and The filter 124 generates and outputs an antiphase signal for canceling noise.
[0048]
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Here, when the call detection unit 106 detects the start of a call, the call detection unit 106 sends
a signal to the switch 128. The switch 128 that has received the signal from the call detection
unit 106 switches the connection from the first filter 124 to the second filter 126. In this state,
when the microphone 120 utters noise, voice data including noise is input to the second filter
126, and the second filter 126 is a cancellation for canceling noise with respect to frequency
bands other than voice. Generate and output a stop signal.
[0049]
As described above, when a call is started between the sound reproduction devices 10, the voice
band is canceled by switching the filter that outputs the cancellation signal, and not only the
noise but also the voice of the other party is reduced. It is possible to prevent the phenomenon
that makes it difficult to make a call.
[0050]
The configuration of the noise canceling system 112 according to the first embodiment of the
present invention has been described above with reference to FIG.
Next, a sound reproducing method using the sound reproducing apparatus 10 according to the
first embodiment of the present invention will be described.
[0051]
FIGS. 5 and 6 are flowcharts for explaining a sound reproduction method using the sound
reproduction apparatus 10 according to the first embodiment of the present invention.
Hereinafter, a sound reproducing method using the sound reproducing apparatus 10 according
to the first embodiment of the present invention will be described using FIGS. 5 and 6.
[0052]
FIG. 5 is a flow chart for explaining the flow in the case where a call is started between the sound
reproduction apparatuses 10 and voice data arrives from the other party first. When a call starts
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between the sound reproducing apparatuses 10, the antenna 102 gets on the radio wave and the
audio data reaches (step S102). When the radio wave is received by the antenna 102, decoding
processing of the radio wave received by the wireless communication unit 104 is performed to
extract voice data (step S104). As described above, the radio wave decoding process performed
by the wireless communication unit 104 depends on the communication protocol between the
sound reproduction devices 10, and is not limited to a specific decoding process, and can be
arbitrarily determined. It is a matter.
[0053]
When the voice data is taken out, the call detection unit 106 detects the start of the call (step
S106). The call detection unit 106 that has detected the start of the call notifies the noise
canceling system 112 of the start of the call (step S108). As described above, when receiving the
call start notification from the call detection unit 106, the noise canceling system 112 switches
the filter to the second filter and generates a cancellation signal for frequency bands other than
human-generated speech. . Then, in parallel with the call start notification from the call detection
unit 106, the equalizer processing of the audio data received by the equalizer 108a is performed
(step S110).
[0054]
FIG. 7 is an explanatory diagram for explaining an outline of the equalizer processing according
to the first embodiment of the present invention. (A) of FIG. 7 schematically represents a
waveform before performing the equalizer processing, and (b) of FIG. 7 schematically represents
a waveform after performing the equalizer processing.
[0055]
Reference numeral 132 indicates a waveform of audio data transmitted from another sound
reproducing apparatus 10. In the present embodiment, the noise canceling system 112 removes
noise. Accordingly, noise is removed from the waveform indicated by reference numeral 132 and
can be heard by the speaker 1. However, since the noise is eliminated, in the frequency band up
to about 1 kHz which the speaker 1 wants to hear normally, the sound becomes small like the
waveform indicated by the reference numeral 134 and the speaker 1's ear is There is a risk that
it will arrive.
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[0056]
Therefore, as shown in (b) of FIG. 7, before voice data is input to the noise canceling system 112,
equalizer processing is performed in the equalizer 108a so as to obtain a waveform as indicated
by reference numeral 136 in advance. By performing the equalizer processing in this way, even if
noise is removed by the noise canceling system 112, it is possible to maintain the waveform of
the sound that the speaker 1 wants to hear to some extent.
[0057]
When the equalizer processing of the received audio data is performed, the equalizer 108 a
inputs the audio data subjected to the equalizer processing to the echo canceller 110. The echo
canceller 110 determines whether or not the input voice data contains an echo signal, and if the
echo signal is contained, stores the echo signal, and from the stored echo signal, determines the
echo signal. A pseudo echo signal is generated which attenuates and prevents the echo signal
from returning to the transmission side (step S112).
[0058]
On the other hand, when noise from a noise source is input to the microphone 120 (step S114),
amplification processing of noise input to the microphone is performed by the second amplifier
122 (step S116), and the amplified noise is noise It is input to the cancellation system 112.
[0059]
When a pseudo echo signal is generated by the echo canceller 110, voice data is input from the
echo canceller 110 to the noise canceling system 112.
In the noise canceling system 112, noise canceling processing is performed to cancel the noise
from the noise source input by the microphone 120 (step S118). The noise canceling process in
the noise canceling system 112 generates the cancellation signal having the phase opposite to
the noise as described above, adds the input audio data and the cancellation signal, and outputs
the result.
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[0060]
Then, the noise canceling process performed by the noise canceling system 112 may be
narrowed down not to the entire band of the voice data but to the frequency band other than the
voice by the call start notification from the call detection unit 106. By performing noise canceling
processing by narrowing the frequency band other than voice in this way, it is possible to
prevent not only the noise from the noise source but also the voice of the speaker 1 itself and the
voice of the other party from being canceled. As a result, it is possible to make a smooth call
while preventing the phenomenon that one's voice feels far.
[0061]
When noise canceling processing is performed by the noise canceling system 112, an output
signal from the noise canceling system 112 is input to the first amplifier 114, and amplification
processing is performed by the first amplifier 114 (step S120). The amount of amplification in
the first amplifier 114 is a design item that can be changed according to the characteristics of
the speaker 118 as described above, and is not limited to a specific amount of amplification.
[0062]
When the signal is amplified by the first amplifier 114, the signal is input to the speaker 118,
and audio is output from the speaker 118 (step S122). Here, the signal output from the speaker
118 is obtained by adding a cancellation signal that cancels out the noise to the voice data from
the other party. Therefore, since the noise from the noise source is canceled by the sound output
from the speaker 118 and the noise reduced noise reaches the speaker 1's ear, a smooth call can
be made with the other party. .
[0063]
FIG. 6 is a flow chart for explaining the case where the speaker 1 who has heard the voice from
the other party inputs the voice from the mouth of the speaker 1 to answer the other party and
sends the voice to the other party. The speaker 1 who has heard the voice from the other party
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inputs the voice to the microphone 120 (step S132). Here, the sound input to the microphone
120 is a propagation sound propagating inside the body of the speaker 1 and a direct sound
directly arriving from the mouth of the speaker 1.
[0064]
When voice is input to the microphone 120, the microphone 120 generates a signal from the
input voice and inputs the signal to the second amplifier 122. The second amplifier 122
performs amplification processing to amplify a signal input from the microphone 120 by a
predetermined amount (step S134). As described above, the amount of amplification amplified by
the second amplifier 122 is a design matter, and is not limited to a specific amount of
amplification.
[0065]
The audio data signal amplified by the second amplifier 122 is input to the noise canceling
system 112 and the echo canceller 110. Echo cancellation processing for combining the input
audio data signal and the pseudo echo signal generated in step S112 when the audio data signal
from the second amplifier 122 is input to the echo canceller 110 and attenuating the echo signal
Is performed (step S136).
[0066]
When the echo cancellation processing is performed by the echo canceller 110, the audio data
signal after the echo cancellation processing is performed is input to the equalizer 108b. The
equalizer 108 b performs equalizer processing on the input audio data signal (step S 138). The
equalizer process performed by the equalizer 108 b is a process of compensating for
characteristics and converting the voice into a voice that the other party can easily hear. When
the equalizer processing is performed by the equalizer 108b, processing for cutting low
frequency components may be performed at the same time. By cutting the low frequency part
lower than the human voice by the equalizer 108 b, it is possible to prevent the noise of the low
frequency part of the noise from the noise source from being transmitted to the other party.
[0067]
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When the equalizer processing in the equalizer 108 b ends, the audio data signal subjected to the
equalizer processing is input to the wireless communication unit 104. In the wireless
communication unit 104, encoding processing of the audio data signal is performed (step S140),
and the audio data signal subjected to the encoding processing is released into the air through
the antenna 102 (step S142).
[0068]
On the other hand, when the audio data signal from the second amplifier 122 is input to the
noise canceling system 112, a cancellation signal is generated to cancel noise from the noise
source included in the input signal as described above. A noise canceling process is performed
(step S144). The audio data subjected to the noise canceling process is amplified by the first
amplifier 114 (step S146), the amplified signal is input to the speaker 118, and the audio is
output from the speaker 118 (step S148). ).
[0069]
The sound reproducing method using the sound reproducing apparatus 10 according to the first
embodiment of the present invention has been described above.
[0070]
As described above, according to the first embodiment of the present invention, the microphone
120 is provided inside the housing 116 so that the noise in the housing 116 is reduced by the
noise canceling system 112.
In this way, it is possible to smoothly talk with the other party by reducing not only the voice
from the other party but also the noise mixed in with his own speaking voice.
[0071]
Second Embodiment In the first embodiment of the present invention, the acoustic reproduction
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device 10 and the acoustic reproduction method for reducing noise by providing the microphone
120 inside the housing 116 have been described. In a second embodiment of the present
invention, an acoustic reproduction apparatus and a method for acoustic reproduction will be
described in which noise is reduced by providing a microphone outside the housing.
[0072]
FIG. 8 is an explanatory diagram for explaining the configuration of the sound reproducing
apparatus 20 according to the second embodiment of the present invention. The configuration of
the sound reproducing apparatus 20 according to the second embodiment of the present
invention will be described below using FIG.
[0073]
As shown in FIG. 8, the sound reproduction device 20 according to the second embodiment of
the present invention includes the antenna 102, the wireless communication unit 104, the call
detection unit 106, the equalizer 108 b, the echo canceller 110, and noise. A cancellation system
112, a first amplifier 114, a housing 216, and a second amplifier 122 are included.
[0074]
The housing 216 is configured to include the speaker 118 and the microphone 220.
[0075]
The sound reproducing apparatus 20 shown in FIG. 8 is different from the sound reproducing
apparatus 10 shown in FIG. 2 in that the equalizer 108 a is not present and the microphone 220
is provided outside the housing 216. .
Therefore, in the following, these differences will be mainly described.
[0076]
Compared to the sound reproduction apparatus 10 shown in FIG. 2, the sound reproduction
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apparatus 20 shown in FIG. 8 does not have an equalizer 108 a that performs equalizer
processing of audio data from a calling party.
This is related to the point that the microphone 220 is provided outside the housing 216. That is,
unlike the first embodiment, in this embodiment, what the microphone 220 records is the noise
from the noise source and the voice from the mouth of the speaker 1, and the voice from the
other party to be output from the speaker 118 is Not collected. Therefore, the sound reproducing
apparatus 20 according to the present embodiment has an effect that when the noise canceling
process is performed by the noise canceling system 112, a cancellation signal that cancels the
voice from the other party is not generated.
[0077]
Further, in the sound reproduction device 20, the microphone 220 is provided outside the
housing 216, as compared with the sound reproduction device 10 shown in FIG. In the first
embodiment, both the noise from the noise source and the voice from the other party are
recorded by the microphone 120, and the recorded sound is input to the noise canceling system
112 to generate a cancellation signal for canceling the noise. The On the other hand, in the
present embodiment, the noise from the noise source is recorded by the microphone 220, and
the sound from the other party is not recorded by the microphone 220. That is, the noise from
the noise source is recorded in advance by the microphone 220, a cancellation signal is
generated from the noise recorded by the noise canceling system 112, and the cancellation
signal is generated and synthesized with the voice data sent from the other party. The person 1 is
characterized in that he can hear the sound with reduced noise.
[0078]
The configuration of the sound reproducing apparatus 20 according to the second embodiment
of the present invention has been described above with reference to FIG.
[0079]
As described above, according to the second embodiment of the present invention, the
microphone 220 is provided outside the housing 216 so that the noise in the housing 116 is
reduced by the noise canceling system 112.
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21
In this way, it is possible to smoothly talk with the other party by reducing not only the voice
from the other party but also the noise mixed in with his own speaking voice. And in this case, it
is not necessary to perform the equalizer process of the voice from the other party by the
equalizer, and the natural voice of the other party can be heard.
[0080]
Although the preferred embodiments of the present invention have been described above with
reference to the accompanying drawings, it goes without saying that the present invention is not
limited to such examples. It will be apparent to those skilled in the art that various changes or
modifications can be conceived within the scope of the appended claims, and of course these also
fall within the technical scope of the present invention. It is understood.
[0081]
For example, in the above embodiment, the microphone is provided either inside or outside the
housing, but the present invention is not limited to this example. For example, a bone conduction
microphone may be further provided separately from the microphone provided either inside or
outside the housing. By providing a microphone for bone conduction, it is possible to convert the
vibration of the vocal cord transmitted through the bone into an audio signal.
[0082]
Also, for example, although only one speaker is illustrated and described in the above
embodiment, the present invention may have two speakers. When there is only one speaker, one
ear can hear the voice from the other party, and when there are two speakers, both ears can hear
the other party's voice.
[0083]
In addition, although the sound reproducing apparatus 10 according to the above embodiment
directly exchanges audio data with the other party by wireless, the sound reproducing apparatus
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of the present invention is not limited to such an example. For example, it is needless to say that
the present invention can be applied to an audio reproduction apparatus that exchanges audio
data with a called party wirelessly via a base station.
[0084]
It is an explanatory view explaining an outline of a sound reproduction device 10 concerning a
1st embodiment of the present invention. It is an explanatory view explaining composition of
sound reproduction device 10 concerning a 1st embodiment of the present invention. It is an
explanatory view explaining composition of noise canceling system 112 concerning a 1st
embodiment of the present invention. It is an explanatory view explaining an outline of a noise
canceling system which reduces noise. It is a flowchart explaining the sound reproduction
method using the sound reproduction apparatus 10 concerning the 1st Embodiment of this
invention. It is a flowchart explaining the sound reproduction method using the sound
reproduction apparatus 10 concerning the 1st Embodiment of this invention. It is an explanatory
view explaining an outline of equalizer processing concerning a 1st embodiment of the present
invention. It is an explanatory view explaining composition of sound reproduction device 20
concerning a 2nd embodiment of the present invention.
Explanation of sign
[0085]
10, 20 sound reproduction apparatus 102 antenna 104 radio communication unit 106 call
detection unit 108a, 108b equalizer 110 echo canceler 112 noise canceling system 114 first
amplifier 116, 216 housing 118 speaker 120, 220 microphone 122 second amplifier 124
second amplifier 124 Filter of 1 126 Second filter 128 switches
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