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JP2010045574

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2010045574
An arrangement relationship in which howling can be prevented even if a speaker and a
microphone for performing hands-free communication are arranged in a close position. A
speaker unit is held in the vicinity of a user's 3 ear by a holding means without being attached to
a baffle plate so that the speaker unit can add the sounds coming from the front and back of the
diaphragm. The microphone 2 for collecting the user's 3 speech sound is provided in the area
where the sounds from the front and back of the diaphragm of the speaker 1 are added and
offset. The speech sound signal of the user 3 from the microphone 2 is output for transmission to
the other party of the call. A call voice signal from the other party of the call is received and
supplied to the speaker 1. [Selected figure] Figure 1
Hands-free calling device, sound reproduction device with hands-free calling function, hands-free
calling method
[0001]
The present invention relates to a hands-free calling device that enables hands-free calling, a
sound reproducing device with a hands-free calling function, and a hands-free calling method.
[0002]
There has been proposed a hands-free communication device which allows a person to make a
call without holding the handset of the telephone by hand.
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In particular, there has also been proposed an on-vehicle hands-free device that enables the
driver to make hands-free calls for safe driving.
[0003]
As this in-vehicle hands-free device, for example, as shown in FIG. 20, a microphone 102 for
transmission of a talker (in this case, a driver) 101 is attached to a sun visor 103 provided inside
a windshield of a car. Things have been proposed. In this case, when the on-vehicle audio
reproduction device is mounted, the speaker used for the acoustic reproduction of the
reproduction sound of the on-vehicle audio reproduction device can be used for the acoustic
reproduction of the reception voice.
[0004]
The speaker 104 used for sound reproduction of the reproduction sound of the in-vehicle audio
reproduction device is provided, for example, embedded in and attached to each door of a
driver's seat, a passenger's seat, and a rear seat of a car as shown in FIG. . Therefore, in the case
of FIG. 20, for example, when the driver makes a hands-free call, the microphone 102 of the sun
visor 103 and the speaker 104 attached to the door on the right side of the driver's seat are
used. There is.
[0005]
However, in the case of FIG. 20, there is a problem of howling because the microphone 102 picks
up the sound emitted from the speaker 104. In addition, since the installation positions of the
microphone 102 and the speaker 104 are separated like the sun visor 103 and the door, there is
a problem that there is a problem in the wiring.
[0006]
In order to improve this point, Patent Document 1 (Japanese Patent Application Laid-Open No.
2001-146136) proposes a hands-free talking device for a car as shown in FIG. According to this
patent document 1, a speaker 112 for receiving is provided on one of the two shoulders above
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the backrest 111 of the seat of the automobile, which sandwich the headrest 114, and the
microphone 113 for transmitting on the other. Is provided.
[0007]
According to the configuration of this patent document 1, the presence of the headrest 114 and
the user (driver) provides sound insulation, and howling is reduced, and the wiring for the
speaker 112 and the microphone 113 is indicated by the wiring portion 115 of FIG. So that they
can be made common.
[0008]
The above-mentioned patent documents are as follows.
JP 2001-146136 A
[0009]
However, in the hands-free car communication system of Patent Document 1 described above,
there is a problem that the howling prevention effect is reduced when the sound emitted from
the speaker 112 is large.
[0010]
Moreover, it is also possible to use the speaker 112 of the hands-free talking device for a car of
this patent document 1 for music reproduction of car audio.
However, in order to prevent howling, the speaker 112 needs to be provided only in the one
where the microphones 113 are not provided on both shoulder portions sandwiching the
headrest 114 above the backrest 111.
[0011]
For this reason, when the speaker of the hands-free talking device for a car of Patent Document 1
is used for music reproduction of car audio, a hands-free call can not be made while listening to
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left and right two-channel stereo reproduction sound.
[0012]
That is, in order to perform left and right two-channel stereo reproduction, it is necessary to
arrange a speaker on both shoulders above the backrest portion 111 of the seat.
However, when such a speaker arrangement is performed, the speaker is arranged in the vicinity
of the microphone 113 also on the side where the microphone 113 is provided. However, in
patent document 1, the structure which arrange | positions the speaker 112 in the vicinity of the
microphone 113 is not assumed, if howling is considered. Therefore, in Patent Document 1, the
speaker for music reproduction needs to be provided separately from the speaker for hands-free
communication.
[0013]
The present invention solves the above-mentioned problems by providing an arrangement
relationship that can prevent howling even when a speaker and a microphone for performing
hands-free communication are arranged close to each other. Intended to provide.
[0014]
In order to solve the above-mentioned problems, the invention according to claim 1 is
characterized in that the speaker unit is not attached to the baffle plate so that sounds emitted
from the front and back of the diaphragm can be added, and the user's ear is A speaker held in
the vicinity of the microphone, a microphone provided in a region where sounds emitted from
the front and back of the diaphragm of the speaker are added and canceled out, Output means
for transmitting the call voice signal of the user from the user to the other party of the call, and
input means for receiving the call voice signal from the other party of the call and supplying it to
the speaker And providing a hands-free communication device comprising:
[0015]
According to the hands-free device according to the invention of claim 1 of the above
configuration, the speaker is held without being attached to the baffle plate so that the sound
coming from the front and back of the diaphragm can be added. It is held near the user's ear by
means.
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[0016]
Then, the microphones are arranged in an area where sounds emitted from the front and back of
the diaphragm of the speaker are added and canceled out.
Therefore, since the microphone does not pick up the sound emitted from the speaker, the
howling due to the microphone picking up the sound emitted from the speaker does not occur.
[0017]
Moreover, since the microphone can be disposed in the vicinity of the speaker, the wiring can be
simplified.
[0018]
Further, according to the invention of claim 7, the speaker unit is not attached to the baffle plate
so that the sounds coming from the front and back of the diaphragm can be added respectively,
and the vicinity of the user's left and right ears by the holding means. Audio signal generating
means for generating an audio signal to be supplied to the first and second speakers to be
acoustically reproduced; and A microphone for picking up the user's speech, provided in an area
where sounds emitted from the front and back of the diaphragm of at least one of the speakers
are added and canceled, and the use from the microphone Output means for outputting a call
voice signal of the person to the other party of the call, provided between the output means and
the microphone A first switch circuit for forming a path of the user's call voice signal from the
microphone to the output means; and receiving the call voice signal from the other party of the
call and supplying it to the at least one speaker Input means for setting the input means, and the
input means and the at least one speaker to form a path of a call voice signal from the other
party from the input means to the at least one speaker during a call A second switch circuit for
the second channel, first and second attenuation means for attenuating the two-channel audio
signal from the audio signal generating means during a call, the second switch circuit, and the at
least one speaker Between the voice signal of one channel from the first and second attenuation
means and the speech signal, To provide an acoustic reproducing apparatus with hands-free call
function comprising a stage, a.
[0019]
According to the sound reproducing apparatus with hands-free calling function of the seventh
aspect of the present invention, the first and second speakers for left and right two channels have
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their speaker units coming out from the front and back of the diaphragm. The holding means is
held near the user's left and right ears without being attached to the baffle plate so that sound
can be added.
[0020]
Then, the microphones are arranged in an area where sounds emitted from the front and back of
the diaphragm of at least one of the first and second speakers are added and canceled out.
Therefore, since the microphone does not pick up the sound emitted from the one speaker, even
if the microphone is disposed at a position close to the one speaker, the emitted sound from the
one speaker is Howling due to the microphone picking up does not occur.
[0021]
For this reason, for example, it becomes possible to arrange the speaker of a right-and-left
channel in the right and left shoulders of the upper part of the backrest part of a chair, and to
arrange a microphone in the vicinity of the one speaker.
Therefore, even if a speaker for hands-free communication is used for music reproduction of car
stereo, for example, howling can hardly occur.
[0022]
And, since the microphone can be arranged in the vicinity of the speaker, the wiring can be
simplified.
[0023]
According to the hands-free communication device according to the present invention, even if the
microphone is disposed in the vicinity of the speaker, the microphone does not pick up the sound
emitted from the speaker, and thus the howling due to the sound emitted from the speaker does
not occur. .
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Moreover, since the microphone can be disposed in the vicinity of the speaker, the wiring can be
simplified.
[0024]
In addition, since the microphone can be disposed in the vicinity of the speaker to prevent
howling, by separating the microphone from the other speakers, the howling can be performed
by collecting the sound from the other speakers. It can be prevented.
Therefore, it is possible to easily use the hands-free speaker also as a speaker for music
reproduction.
[0025]
Hereinafter, an embodiment of a hands-free speech apparatus according to the present invention
and an embodiment of a sound reproduction apparatus with hands-free speech function will be
described with reference to the drawings.
[0026]
[Embodiment of Hands-free Communication Device (First Embodiment)] FIG. 1 is a diagram for
explaining a configuration example of an embodiment of a hands-free communication device
according to the present invention.
[0027]
In the hands-free communication device 10 of the embodiment shown in FIG. 1, the speaker 1 is
disposed in the vicinity of the left ear of the user 3.
The speaker 1 has a so-called naked speaker configuration.
That is, the speaker unit is not housed in the speaker box so that the sound radiated to the front
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of the diaphragm of the speaker unit and the sound radiated from the back can be mixed, and the
speaker 1 is not , Not attached to the baffle plate.
[0028]
In this naked speaker 1, as shown in FIG. 2, the sound wave Sf emitted from the front of the
diaphragm of the speaker unit and the sound wave Sb emitted from the rear are mixed.
Here, the phase of the sound wave Sf emitted from the front of the diaphragm of the speaker unit
(see FIG. 3A) and the phase of the sound wave Sb emitted from the rear of the diaphragm (see
FIG. 3C) It becomes.
For this reason, in the area parallel to the plane including the outer peripheral end of the
diaphragm of the speaker 1 and in the area outside the outer peripheral end of the diaphragm,
the sounds coming from the front and back of the diaphragm are added and canceled out. There
is a region (hereinafter, referred to as a sound pressure zero region) Zo where the sound
pressure is substantially zero (see FIG. 3B).
[0029]
The sound pressure zero area Zo can be confirmed by collecting the radiation sound wave from
the speaker 1 by the microphone when the sound is reproduced by the speaker 1. In FIG. 2, the
broken line 5 indicates this area.
[0030]
In this embodiment, the microphone 2 for collecting the transmission voice of the transmitter
(user 3) is disposed at an arbitrary position in the zero sound pressure area Zo. In practice, for
example, since the vicinity of the outer peripheral frame portion of the diaphragm of the speaker
1 is in the zero sound pressure zone Zo, the microphone 2 is fixed to the outer peripheral frame
portion of the diaphragm of the speaker 1 The microphone 2 is disposed in the zero region Zo.
That is, in this example, the holding means of the microphone 2 is the speaker 1.
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[0031]
In this embodiment, as shown in FIG. 4, in the speaker 1 of the headrest 7 of the chair 6 on
which the user 3 sits, the vibration surface of the diaphragm 1C faces the user on the left ear side
of the user 3. As fixed. In this example, the vibration surface of the diaphragm 1C is inclined at,
for example, about 45 degrees with respect to the long-piece direction of the headrest portion 7
so that the vibration surface of the diaphragm 1C of the speaker 1 faces the user. In the state, the
speaker 1 is attached to the headrest portion 7.
[0032]
Then, as shown in FIG. 4, the microphone 2 is fixed at a position corresponding to the mouth of
the user 3 in the outer peripheral frame portion 1A of the diaphragm 1C of the speaker 1. In the
example of FIG. 4, the speaker 1 is attached to the headrest portion 7 in a state where the
attachment position of the microphone 2 in the outer peripheral frame portion 1A of the speaker
1 is at the lowermost position.
[0033]
Then, the microphone 2 picks up the call voice uttered by the user 3. A call voice signal obtained
through acoustic-electrical conversion by the microphone 2 is supplied to the low pass filter 12
through the microphone amplifier 11. Then, the output voice signal of the low pass filter 12 is
supplied to the transmission voice input terminal of the portable telephone terminal 4 through
the voice signal output terminal 13 in this embodiment.
[0034]
Also, a received voice signal from the other party of the call from the received voice output
terminal of the mobile phone terminal 4 is input to the hands-free communication device 10 of
this embodiment through the voice signal input terminal 14. The received voice signal input
through the voice signal input terminal 14 is supplied to the speaker 1 through the power
amplifier 15. In this case, since the speaker 1 is disposed near the user's ear, the volume of the
call sound emitted from the speaker 1 may be small. This is also more effective in preventing
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howling.
[0035]
The low pass filter 12 is provided for the following reason in this embodiment. That is, of the
sounds coming from the front and back of the diaphragm 1C of the bare speaker 1, particularly
for low frequencies, the effect of canceling out the sounds coming from the front and back of the
diaphragm 1C is large. The middle and high frequency components of the sound coming from
the front and rear of the diaphragm 1C of the naked speaker 1 are greatly attenuated in the zero
sound pressure zone Zo, but not completely zero.
[0036]
Therefore, in this embodiment, the sound pressure is almost completely canceled by the low-pass
filter 12 when arranged in the above-mentioned zero sound pressure zone Zo in order to enable
stable communication without more feedback. It limits to only the speech voice band component
which becomes zero. In this example, the cutoff frequency in the low pass filter 12 is, for
example, about 2 kHz. The cutoff frequency of the low pass filter 12 differs depending on the use
environment of the hands-free communication device, and may be considered, for example, when
the cutoff frequency is 1 kHz or less.
[0037]
According to the above configuration, according to the hands-free device 10 of this embodiment,
it is possible to make a stable call without worrying howling. Then, the microphone 2 can be
fixed to the speaker 1, and the speaker 1 and the microphone 2 can be closely approached and
handled as one body, so that the installation and wiring, etc. become very easy. There is also.
[0038]
Further, for example, as shown by a dotted line in FIG. 4, the right channel speaker SPR is
disposed on the right ear side, and the speaker 1 of the above-described embodiment is a left
channel speaker. Is also easy to realize.
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[0039]
In the above-described embodiment, the speaker 1 and the microphone 2 are disposed only on
the left side of the user. However, it goes without saying that the speaker 1 and the microphone
2 may be disposed on the right side of the user.
[0040]
Further, speakers and microphones may be provided on both the left side and the right side of
the user in the same arrangement relationship as the speaker 1 and the microphone 2 described
above, and both may be used for hands-free communication.
In that case, the transmission voice signals picked up by the left and right microphones and
passed through the low pass filter are synthesized and sent out from the voice signal output
terminal 13.
Also, the received voice signal from the other party is distributed to the left and right speakers
for sound reproduction.
[0041]
[Embodiment of Sound Reproducing Device with Hands-Free Call Function] Second Embodiment
FIG. 5 is a block diagram showing a configuration example of an embodiment (second
embodiment) of the sound reproducing device with hands-free call function. is there. In FIG. 5,
the same components as those of the above-described hands-free communication device 10 are
assigned the same reference numerals.
[0042]
The second embodiment is a case where a speaker of one of the left and right channels of the
stereo sound reproducing apparatus is also used for the hands-free call function.
[0043]
The sound reproduction apparatus with hands-free calling function of this embodiment includes
an audio signal processing unit 20, a music source unit 30 as an example of an audio signal
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generating unit, a control unit 40, an operation button group 41, a mobile phone terminal 4. And
consists of
[0044]
And as shown in FIG. 6, in this embodiment, the left channel speaker 1L and the right channel
speaker 1R are attached to the left and right sides of the headrest portion 52 of the chair 51 on
which the user 3 sits.
These left and right channel speakers 1L and 1R are configured as naked speakers.
[0045]
Then, in this embodiment, the microphone 2 for collecting the transmission voice of the
transmitter (user 3) is disposed at an arbitrary position in the zero sound pressure area Zo for
the sound wave radiated from the speaker 1L of the left channel. Be done.
As described above, since the vicinity of the outer peripheral frame portion of the diaphragm of
the speaker 1L is the zero sound pressure zone Zo, also in this embodiment, the microphone 2 is
fixed to the outer peripheral frame portion of the diaphragm of the speaker 1L. Thus, the
microphone 2 is disposed in the sound pressure zero area Zo.
[0046]
In this embodiment, since the left channel speaker 1L is used for the handsfree call function, the
microphone 2 is provided only for the left channel speaker 1L, and the right channel speaker is
used for the handsfree call. I can not.
[0047]
In this embodiment, the music source unit 30 includes a CD (Compact Disc) player, a hard disk
drive (hereinafter abbreviated as HDD) 31H, and a broadcast receiving unit 31B.
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When a CD is loaded into the CD player 31C, the CD player 31C decodes and outputs audio
signals of two channels. Music data of a large number of music contents are stored in the HDD
31 H. When this is selected, the music data is decoded to output audio signals of two channels.
The broadcast receiving unit 31B can receive, for example, AM radio broadcast, FM radio
broadcast, and television broadcast, and outputs the received broadcast audio as a two-channel
audio signal.
[0048]
In this embodiment, the audio signals of the left and right channels from the CD player 31C, the
HDD 31H, and the broadcast receiving unit 31B are supplied to the audio signal processing unit
20.
[0049]
In the audio signal processing unit 20, audio signals of two channels from the CD player 31C, the
HDD 31H and the broadcast receiving unit 31B are input to the source selection circuit 32.
[0050]
As shown in FIG. 7, the operation button group 41 includes selection buttons such as a telephone
button 61, a CD button 62, an HDD button 63, a broadcast button 64, and a volume control knob
65.
An operation signal corresponding to the button operation by the user at the operation button
group 41 is supplied to the control unit 40.
[0051]
The operation button group 41 includes so-called repeat reproduction, shuffle reproduction for
the CD player 31C and the HDD 31H, and operation buttons for broadcasting channel selection
in the broadcast receiving unit 31B, in addition to the selection buttons as described above. .
However, in order to simplify the description, illustration and description of these buttons are
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omitted.
[0052]
The control unit 40 includes, for example, a microcomputer, generates a control signal according
to the button operation of the user in the operation button group 41, and each unit necessary for
the music source unit 30 and the audio signal processing unit 20. Supply to
[0053]
In the sound reproduction apparatus with hands-free calling function of this embodiment, the
control unit 40 is set to be in the music source reproduction mode when the telephone button 61
is not pressed and in the hands-free calling mode when the telephone button 61 is pressed. It is
controlled.
In the hands-free call mode in this embodiment, the reproduction of the music source is not
stopped, and as described later, control is performed so that the volume of the music source is
reduced to such an extent that the hands-free call is not affected. Be done.
[0054]
Then, in the music source reproduction mode, when a selection button for a music source such as
the CD button 62, the HDD button 63, and the broadcast button 64 is pressed, the control unit
40 supplies a source selection signal to the source selection circuit 32.
[0055]
The source selection circuit 32 is selectively controlled by the source selection signal, and
performs selection control to select a music source corresponding to the pressed selection
button.
For example, when the CD button 62 is pressed, the source selection circuit 32 selectively
outputs the left and right two-channel audio signals from the CD player 31C. Similarly, when the
HDD button 63 is pressed, the left and right two-channel audio signals from the HDD 31H are
selected, and when the broadcast button 64 is pressed, the left and right two-channel audio
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signals from the broadcast receiving unit 31B are selected. The circuits 32 selectively output.
[0056]
Of the two channels of audio signals from the source selection circuit 32, in this embodiment, the
audio signal of the left channel is supplied to the mixing circuit 36 with the received audio signal
at the time of a call through the attenuator 33L. The output audio signal of the mixing circuit 36
is supplied to the speaker 1L for the left channel through the volume control volume 34L and the
power amplifier 35L, and the sound is reproduced.
[0057]
In addition, the audio signal of the right channel among the audio signals of the two channels
from the source selection circuit 32 is supplied to the speaker 1R for the right channel through
the volume adjustment volume 34R and the power amplifier 35R through the attenuation unit
33R. Sound is reproduced.
[0058]
In this case, since the speakers 1L and 1R are disposed in the vicinity of the user's ear, the sound
emitted from the speakers 1L and 1R may be a small output volume.
[0059]
The attenuation units 33L and 33R are for reducing the volume of the music source from the
music source unit 30 when performing a hands-free call in the sound reproduction apparatus
with a hands-free call function of this embodiment.
In the music source reproduction mode, the attenuation amounts of the attenuation units 33L
and 33R are zero.
That is, the attenuation units 33L and 33R input and output the input audio signal without
attenuation in the music source reproduction mode.
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[0060]
Then, when the telephone button 61 of the operation button group 41 is pressed by the user, the
control unit 40 detects it, switches to the hands-free call mode, and supplies an attenuation
control signal to the attenuation units 33L and 33R, The speech signal from the source selection
circuit 32 is attenuated.
[0061]
In this case, the attenuation amounts of the attenuation units 33L and 33R are selected so as to
attenuate the audio signal of the music source to such an extent that it does not disturb the call.
The attenuation amounts of the attenuation portions 33L and 33R may be the same. However, in
this embodiment, only the left channel is used for communication, so the attenuation of the left
channel attenuator 33L is larger than the attenuation of the right channel attenuator 33R. For
example, in this embodiment, the attenuation amount of the attenuation unit 33L of the left
channel is -20 dB and the attenuation amount of the attenuation unit 33R of the right channel is 10 dB at the time of hands-free communication.
[0062]
The volume adjustment volumes 34L and 34R are for controlling the volume of the audio signal
supplied to the speakers 1L and 1R according to the operation of the volume adjustment knob 65
by the user.
[0063]
That is, when the user rotates the volume adjustment knob 65, for example, to the right, the
control unit 40 detects it, and the volume of the audio signal supplied to the speakers 1L and 1R
corresponds to the amount corresponding to the amount of rotation. The volume control volumes
34L and 34R are controlled to increase the volume.
In addition, when the user rotates the volume adjustment knob 65, for example, to the left, the
control unit 40 detects it, and the volume of the audio signal supplied to the speakers 1L and 1R
corresponds to the amount corresponding to the amount of rotation. The volume control volumes
34L and 34R are controlled to be reduced.
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[0064]
Next, the processing system of the voice signal of the handsfree call will be described.
[0065]
In this embodiment, as shown in FIG. 5, the microphone 2 picks up the call voice uttered by the
user 3, performs acoustic-electric conversion into a call voice signal, and is input to the voice
signal processing unit 20. .
In the audio signal processing unit 20, the speech signal from the microphone 2 is supplied
through the microphone amplifier 21 to the low pass filter 22 similar to the low pass filter 12
described above. Then, the output sound signal of the low pass filter 22 is supplied to the call
side terminal (input terminal) T of the switch circuit 23 switched between the time of the call and
the time of the music source reproduction.
[0066]
The music reproduction side terminal (input terminal) M of the switch circuit 23 is grounded in
this embodiment.
[0067]
The switching terminal (output terminal) of the switch circuit 23 is connected to the transmission
voice input terminal of the portable telephone terminal 4 through the voice signal output
terminal 24 in this embodiment.
That is, the transmission voice signal of the user 3 collected by the microphone 2 is supplied to
the transmission voice input terminal of the portable telephone terminal 4.
[0068]
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Further, a received voice signal from the other party of the call from the received voice output
terminal of the mobile phone terminal 4 is input to the voice signal processing unit 20 of this
embodiment through the voice signal input terminal 25. Then, the received voice signal inputted
through the voice signal input terminal 25 is supplied to the call side terminal (input terminal) T
of the switch circuit 26 which is switched between the time of the call and the time of the music
source reproduction.
[0069]
The music reproduction side terminal (input terminal) M of the switch circuit 26 is grounded in
this embodiment. The switching terminal (output terminal) of the switch circuit 26 is connected
to the mixing circuit 36, and a reception voice signal from the other party is supplied to the
mixing circuit 36 through the call side terminal T during a call. Then, the output sound signal of
the mixing circuit 36 is supplied to the speaker 1L for the left channel through the volume
adjustment volume 34L and the power amplifier 35L, and the sound is reproduced.
[0070]
[Description of Operation of Second Embodiment] In the music source reproduction mode, the
switch circuit 23 and the switch circuit 26 are respectively switched to the music reproduction
side terminal M, and the collected voice signal from the microphone 2 is a switch circuit. It is
supplied to the ground terminal through 23A. Further, the audio signal from the mobile phone
terminal 4 is blocked by the switch circuit 26.
[0071]
Then, the music source from the music source unit 30 is supplied to the speakers 1L and 1R of
the left and right channels and reproduced as sound. The amount of attenuation at the
attenuation portions 33L and 33R at this time is zero. Then, the output volume is changed by the
operation of the volume adjustment knob 65 of the operation button group 41. Further, by
operating the CD button 62, the HDD button 63, the broadcast button 64 and the like of the
operation button group 41, the source source of the two-channel audio signal transmitted from
the music source unit 30 is changed.
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[0072]
Next, when the mobile phone terminal 4 receives an incoming call in the music source
reproduction mode, in this embodiment, the user performs an incoming call response operation
(for example, an off-hook operation) on the mobile phone terminal 4 and an operation button
The telephone button 61 of the group 41 is depressed.
[0073]
In addition, when the user 3 makes a hands-free call by making a call from the mobile phone 4 to
the other party, in this embodiment, the user 3 performs a call operation to the other party with
the mobile phone 4. The telephone button 61 is pressed.
[0074]
When the user presses the telephone button 61 of the operation button group 41, the control
unit 40 detects it and switches the voice signal processing unit 20 to the hands-free call mode.
Then, the control unit 40 supplies switching control signals for switching these to the call side
terminal T to the switch circuits 23 and 26, and outputs the above-described attenuation control
signals to the attenuation units 33L and 33R. .
As a result, the attenuator 33L attenuates the input audio signal by -20 dB and outputs it, and the
attenuator 33R attenuates the input audio signal by -10 dB and outputs it.
[0075]
Then, the transmission voice signal of the voice of the user 3 collected by the microphone 2 is
supplied to the mobile phone terminal 4 through the microphone amplifier 21, the low pass filter
22, the switch circuit 23 and the voice signal output terminal 24. Sent over the mobile phone
network. Further, the received voice signal from the other party received by the mobile phone
terminal 4 is input to the voice signal processing unit 20 through the voice signal input terminal
25.
[0076]
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The received voice signal from the other party that has been input is mixed with the voice signal
of the left channel from the attenuation unit 33L in the mixing circuit 36, and is supplied to the
speaker 1L through the volume control volume 34L and the power amplifier 35L. Therefore, the
received speech signal is mixed with the attenuated left channel speech signal and reproduced as
sound by the speaker 1L.
[0077]
Further, the sound signal of the right channel is in a state of being reproduced by the right
channel speaker 1R after being attenuated by -10 dB.
[0078]
As described above, in this hands-free call mode, the two-channel sound signal from the music
source unit 30 is attenuated by -20 dB and -10 dB in the attenuation units 33L and 33R,
respectively, so that it becomes difficult to hear the call sound. Is prevented.
[0079]
Therefore, in the handsfree call mode, while continuing to listen to the music source that the user
has listened to in the music source reproduction mode, handsfree communication with the other
party through the mobile phone 4 is possible.
[0080]
Then, since the speakers 1L and 1R are disposed in the vicinity of the user's ear, the original
sound emission output volume (sound pressure) may be small.
This and the fact that the microphone 2 is disposed in the sound pressure zero area Zo of the
speaker 1 L also prevents howling and enables hands-free communication while listening to a
music source in this embodiment. It becomes.
[0081]
When the user 3 presses the telephone button 61 and makes a call to the other party from the
mobile phone terminal 4 to make a hands-free call, if the other party responds, the music source
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is set as described above. Enables hands-free calling while listening.
[0082]
In this embodiment, a response to an incoming call to the mobile telephone terminal 4 and a call
origination operation are dealt with by performing an incoming call response operation or a call
origination operation in the mobile telephone terminal 4.
[0083]
However, when the mobile phone terminal 4 is provided with a connection terminal with a
computer, a hands-free kit is also realized that realizes an automatic call / end call and a onetouch transmission function to a registered destination using the connection terminal. Exists.
Therefore, by providing the control unit 40 with the function of the hands-free kit, it is of course
possible to perform the function such as automatic call reception / end call.
[0084]
Third Embodiment (Embodiment of Sound Reproducing Device with Hands-Free Call Function) In
the second embodiment described above, the user is required to use the CD player 31C, the HDD
31H, the broadcast receiver 31B, etc. of the music source unit 30. It has been described that
control of each source is performed by the operation buttons of the operation button group 41.
[0085]
On the other hand, in the third embodiment, the microphone for the hands-free calling function
is also used for collecting the voice control word when the selection control of each source
source and the volume control are performed by voice recognition. In the case of
In this embodiment, although control by the operation button of the operation button group 41 is
also possible, control by voice recognition is further possible.
[0086]
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21
FIG. 8 is a block diagram showing a configuration example of a third embodiment of the sound
reproducing device with hands-free calling function.
In FIG. 8, the same parts as those of the configuration example of the second embodiment of FIG.
5 are assigned the same reference numerals, and the description thereof will be omitted.
[0087]
Also in the third embodiment, as shown in FIG. 6, the left channel speaker 1L and the right
channel speaker 1R are attached to the left and right sides of the headrest portion 52 of the chair
51 on which the user 3 sits.
These left and right channel speakers 1L and 1R are configured as naked speakers.
Then, for the sound wave radiated from the speaker 1L of the left channel, the microphone 2 for
collecting the transmission voice of the transmitter (user 3) is disposed at an arbitrary position in
the zero sound pressure zone Zo.
[0088]
Also in this embodiment, the microphone 2 is fixed to the outer peripheral frame portion of the
diaphragm of the speaker 1L, and the microphone 2 is disposed in the zero sound pressure area
Zo.
[0089]
In the third embodiment, as shown in FIG. 8, the audio signal from the microphone 2 through the
low pass filter 22 is supplied to the switching terminal (input terminal) of the switch circuit 23M.
And, in this embodiment, the voice signal from the microphone 2 through the low pass filter 22
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is transmitted from the call side terminal (output terminal) T of the switch circuit 23 M through
the voice signal output terminal 24 to transmit voice of the mobile telephone terminal 4. It is
supplied to the input terminal.
[0090]
Further, in this embodiment, the audio signal from the microphone 2 which has passed through
the low pass filter 22 is supplied to the audio recognition circuit 42 through the music
reproduction side terminal (output terminal) M of the switch circuit 23M. In this voice
recognition circuit 42, for control of utterances of source selection such as “CD”, “HDD”,
“broadcast”, etc., “repeat”, “change”, “volume up”, “volume down”, etc. It is
configured to perform speech recognition of a spoken word. Then, the speech recognition result
in the speech recognition circuit 42 is supplied to the control unit 40.
[0091]
The control unit 40 performs control in accordance with the speech recognition result from the
speech recognition circuit 42. For example, when the control unit 40 determines that the speech
recognition result of the source selection speech such as "CD", "HDD", or "broadcast" has been
received from the speech recognition circuit 42, the source designated by the speech Switch
source selection circuit 32 to select. For example, when it is determined that "CD" is uttered, the
control unit 40 switches the source selection circuit 32 to select the CD player 31C.
[0092]
In addition, when the control unit 40 determines that the user has uttered “repeat” when
“CD” and “HDD” are selected as the source, the control unit 40 repeatedly reproduces the
music content being reproduced again. Do. In addition, when the control unit 40 determines that
“change” is uttered when “CD” and “HDD” are selected as the source, the music content
to be reproduced is from the one currently being reproduced, The CD player 31C or the HDD
31H is controlled to change to another music content. Also, when it is determined that "change"
is uttered when "broadcast receiver" is selected as the source, the controller 40 changes the
broadcast channel to be received from the current channel to another channel. In addition, the
broadcast reception unit 31B is controlled.
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[0093]
When the control unit 40 determines that "volume up" or "volume down" has been uttered, the
control unit 40 controls the volume adjustment volumes 34L and 34R in accordance with the
recognized utterance.
[0094]
Other configurations and operations are similar to those of the second embodiment described
above.
That is, the configuration is the same as that of the second embodiment except that the audio
signal from the microphone 2 obtained at the music reproduction side terminal (output terminal)
M of the switch 23M is supplied to the speech recognition circuit 42.
[0095]
According to the above-described third embodiment, in addition to the effects of the abovedescribed second embodiment, the following effects can be obtained.
[0096]
That is, the microphone for transmitting and collecting voice in hands-free communication can be
used also as a microphone for collecting speech for voice recognition used for selection of music
source and control for volume control and the like.
Since voice recognition enables control of music source selection and volume control, if this third
embodiment is applied to, for example, an on-vehicle audio apparatus, hands can be used not
only in hands-free calling but also in music playback. It becomes free and improves safety.
[0097]
It goes without saying that this third embodiment can be applied not only to an on-vehicle audio
device but also to a device configured by attaching a speaker and a microphone to, for example,
the headrest portion of a living chair described above.
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24
[0098]
[Fourth Embodiment (In-Vehicle Audio System)] In this fourth embodiment, each user needs to
enjoy music source playback between two hands-free audio playback devices with a call function.
It is configured to be able to talk with each other at certain times.
The embodiment to be described below is a case where, as an on-vehicle audio system, for
example, an acoustic reproduction device with a hands-free calling function is provided for a
driver's seat and a passenger's seat.
[0099]
FIG. 9 is a block diagram showing the overall configuration of the car audio system of the fourth
embodiment. The same parts as those of the above-described embodiment are denoted by the
same reference numerals. As shown in FIG. 9, in the fourth embodiment, for example, the user 3B
is seated at the driver's seat and the user 3A is seated at the assistant's seat.
[0100]
In the fourth embodiment, the left channel speakers 1LA and 1LB are at the left end of the
headrest portion (not shown) of the chair on which the user 3A and the user 3B sit, and the right
channel speaker 1RA and the right channel end of the headrest portion. One RB is attached.
These left and right channel speakers 1LA, 1LB and 1RA, 1RB are configured as naked speakers.
[0101]
Then, in the fourth embodiment, for the user 3A of the front passenger seat, with regard to the
sound wave radiated from the speaker 1LA of the left channel, at the arbitrary position of the
zero sound pressure zone Zo, A microphone 2A for collecting transmission voice is disposed. In
addition, for the user 3B at the driver's seat, for the sound emission sound of the transmitter
(user 3B) at an arbitrary position in the zero sound pressure zone Zo, for the sound wave
10-05-2019
25
radiated from the speaker 1RB in the right channel. The microphone 2B is disposed.
[0102]
Also in this embodiment, the microphones 2A and 2B are fixed to the outer peripheral frame
portions of the diaphragms of the speaker 1LA and the speaker 1RB in the zero sound pressure
area Zo, and the microphones 2A and 2B are disposed in the sound pressure zero area Zo. Be
done.
[0103]
As described above, in this embodiment, the microphone 2A is provided on the speaker 1LA side
for the left channel for the user 3A at the front passenger seat, and the speaker 1RB for the right
channel for the user 3B at the driver seat Is provided with a microphone 2B.
[0104]
In this manner, the microphones 2A and 2B are disposed on the left and right to be separated
from each other as much as possible to prevent the microphone 2A from collecting the voice of
the user 3B and the microphone 2B This is to prevent the voice of the user 3A from being picked
up as much as possible.
[0105]
In this embodiment, the operation button group 41A is provided for the user 3A, and the
operation button group 41B is provided for the user 3B.
Operation signals according to the operations of the users 3A and 3B with respect to the
operation button groups 41A and 41B are supplied to the control unit 40.
The control unit 40 determines which of the operation button groups 41A and 41B has been
operated and which operation button has been pressed, and performs control according to the
result of the judgment.
[0106]
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26
The audio signal processing unit 20A is provided for the user 3A, and the audio signal processing
unit 20B is provided for the user 3B.
The portable telephone terminal 4A can be connected to the audio signal processing unit 20A,
and the portable telephone terminal 4B can be connected to the audio signal processing unit
20B. Further, audio signals of the left and right channels from the CD player 31C, the HDD 31H,
and the broadcast receiving unit 31B of the music source unit 30 are supplied to the audio signal
processing units 20A and 20B, respectively.
[0107]
The audio signal processing units 20A and 20B have basically the same configuration as the
audio signal processing unit 20 in the second embodiment described above. That is, the music
source unit 30 selects and reproduces the music source, and telephone communication (handsfree call) with an external partner through the mobile telephone network is possible through the
mobile telephone terminals 4A and 4B. .
[0108]
In the fourth embodiment, the audio signal processing units 20A and 20B further use the
speaker 1LA, the microphone 2A, the speaker 1RB, and the microphone 2B between the user 3A
and the user 3B. It is configured to be able to communicate between devices. In this inter-device
call, when a call using a mobile phone terminal is an external call, it becomes an extension call (a
conversation between users).
[0109]
Furthermore, in the fourth embodiment, seating sensors 43A and 43B are provided on the chairs
(seats) on which the users 3A and 3B sit, for detecting the seating of the users 3A and 3B when
the users 3A and 3B sit on the chairs. It is done. The seating detection outputs of the seating
sensors 43A and 43B are supplied to the control unit 40.
10-05-2019
27
[0110]
The control unit 40 enables only the audio signal processing units 20A and / or 20B for the
users 3A and / or 3B whose seating detection outputs from the seating sensors 43A and 43B
indicate seating. For example, the control unit 40 supplies the power supply voltage only to the
audio signal processing unit 20A and / or 20B for the user 3A and / or 3B in the state indicating
seating, and enables the operation thereof, thereby saving power. In order to
[0111]
The audio signal processing units 20A and 20B have exactly the same configuration. FIG. 10
shows the configuration of the audio signal processing unit 20A as a representative of both
processing units 20A and 20B. In FIG. 10, the same parts as those in FIG.
[0112]
Further, FIG. 11 shows only the components for the hands-free call in the audio signal processing
units 20A and 20B. In FIG. 11, the same parts in the audio signal processing units 20A and 20B
are indicated by appending suffixes A and B to the same numbers.
[0113]
As shown in FIG. 10, the call voice uttered by the user 3A is picked up by the microphone 2A,
subjected to acoustic-electric conversion into a call voice signal, and input to the voice signal
processing unit 20A.
[0114]
In the voice signal processing unit 20A, the call voice signal from the microphone 2A is supplied
to the low pass filter 22A through the microphone amplifier 21A.
Then, the output sound signal of the low pass filter 22A is supplied to the call side terminal
(input terminal) T of the switch circuit 23A which is switched between the time of the call and
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28
the time of the music source reproduction.
[0115]
The music reproduction side terminal (input terminal) M of the switch circuit 23A is grounded in
this embodiment. The switch terminal (output terminal) of the switch circuit 23A is a switch
terminal (switch terminal) of the switch circuit 27A that can be switched between an outside call
via the mobile phone terminal 4A and a conversation (extension call) with another user 3B.
Connected to the input terminal).
[0116]
The outside telephone call side terminal (output terminal) ET of the switch circuit 27A is
connected to the transmission voice input terminal of the portable telephone terminal 4A in this
embodiment through the voice signal output terminal 24A.
[0117]
Also, a received voice signal from the other party of the call from the received voice output
terminal of the mobile phone terminal 4A is input to the voice signal processing unit 20A of this
embodiment through the voice signal input terminal 25A.
Then, the reception voice signal input through the voice signal input terminal 25A is switched
between the external circuit of the switch circuit 28A which is switched at the time of an external
call via the mobile phone terminal 4A and at the time of conversation (internal call) with another
user 3B. It is supplied to the call side terminal (input terminal) ET.
[0118]
In the fourth embodiment, as shown in FIG. 11, the extension call side terminal (output terminal)
IT of the switch circuit 27A is an extension of the switch circuit 28B of the voice signal
processing unit 20B of another user 3B. It is connected to the call terminal (input terminal) IT.
Further, the extension call side terminal (output terminal) IT of the switch circuit 27B of the voice
signal processing unit 20B of another user 3B is the extension call side terminal (input terminal)
10-05-2019
29
of the switch circuit 28A of the voice signal processing unit 20A of the user 3A. ) Connected to
IT.
[0119]
Then, an audio signal obtained at the switching terminal (output terminal) of the switch circuit
28A is supplied to the call side terminal (input terminal) T of the switch circuit 26A. The music
reproduction side terminal (input terminal) M of the switch 26A is grounded in this embodiment.
[0120]
The audio signal obtained at the switching terminal (output terminal) of the switch circuit 26A is
supplied to the mixing circuit 36A and added to the audio signal of the left channel supplied to
the mixing circuit 36A through the attenuator 33LA.
[0121]
In the case of the audio signal processing unit 20B for the user 3B, the audio signal obtained at
the output terminal of the switch circuit 28B is sent to the mixing circuit 36B with the audio
signal of the right channel through the call side terminal T of the switch circuit 26B. Supplied.
Then, the audio signal obtained at the output terminal of the switch circuit 28B is added to the
audio signal of the right channel passed through the attenuator 33RB in the mixing circuit 36B.
[0122]
In the fourth embodiment, as shown in FIG. 12, a conversation button 66 is added to the
configuration of the operation button group 41 shown in FIG. 7 in the operation button groups
41A and 41B. When the conversation button 66 is pressed, the control unit 40 determines that
an extension call request in the hands-free call mode has occurred, and performs a control
operation to enable the extension call.
[0123]
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30
[Operation of Fourth Embodiment] In the system of the fourth embodiment configured as
described above, when any of the operation buttons of the operation button group 41A or 41B is
operated by the user 3A or 3B. The operation of will be described below.
[0124]
The control unit 40 monitors the seating detection output from the seating sensors 43A and 43B
to detect seating on the seat of the users 3A and 3B.
Then, when the seat of the user 3A is detected, the control unit 40 powers on the sound signal
processing unit 20A to enable the operation. Similarly, when the seat of the user 3B is detected,
the control unit 40 powers on the audio signal processing unit 20A to enable the operation. Since
this embodiment is an on-vehicle system, it goes without saying that the system is powered on
when the accessory switch is turned on by the key.
[0125]
The seating of the user 3A and the user 3B is detected, and in the audio signal processing units
20A and 20B which are enabled by the control unit 40, the above-described third embodiment is
performed except when the conversation button 66 is pressed. The same operation as in the first
embodiment is performed.
[0126]
That is, in the music source reproduction mode in which the telephone button 61 is not pressed,
for example, in the audio signal processing unit 20A, the control unit 40 connects the switch
circuits 23A and 26A to the music reproduction terminal M in this embodiment. .
Then, in the music source reproduction mode, as described above, the source is selected
according to the depression of the CD button 62, the HDD button 63, the broadcast button 64,
etc. under the control of the control unit 40, and two speakers are used. , 2 channel stereo audio
playback.
[0127]
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31
In this embodiment, the user 3A and the user 3B can select and enjoy different music sources.
[0128]
Then, when the telephone button 61 is pressed in the music source reproduction mode, the
control unit 40 switches to the hands-free call mode.
In this embodiment, for example, in the audio signal processing unit 20A, the control unit 40
switches the switch circuits 23A and 26A to the call side terminal T, and switches the switch
circuits 27A and 28A to the outside line call side terminal ET. Further, the control unit 40
controls the attenuator 33LA to attenuate the input signal by -20 dB, and the attenuator 33RA
controls to attenuate the input signal by -10 dB.
[0129]
In the hands-free communication mode, as described above, the transmission voice from the
microphone 2A is sent to the other party, and the reception voice from the other party is heard
on one of the channels. As a result, music playback continues and hands-free calling becomes
possible.
[0130]
Next, an operation when the conversation button 66 is operated will be described. In this
embodiment, the operation of the conversation button 66 in the operation button group 41A is
an extension call request from the user 3A to the user 3B, and the operation of the conversation
button 66 in the operation button group 41B is from the user 3B It becomes an extension call
request to the user 3A.
[0131]
When an extension call request occurs, the control unit 40 determines whether the requested
party is seated and the voice signal processing unit is in the operable state, and if the voice signal
10-05-2019
32
processing unit is not in the operable state, Notify the user who made the extension call request
to that effect. This notification is made by, for example, the control unit 40 by mixing a buzzer
sound with the audio signal of the music source.
[0132]
Next, when the voice signal processing unit of the other party who has made the extension call
request is in the operable state, the control unit 40 controls so that a hands-free extension call
(conversation) can be made.
[0133]
This control will be described, for example, in the case where the user 3A presses the
conversation button 66.
First, in the audio signal processing unit 20A, the control unit 40 switches the switch circuits
23A and 26A to the call side terminal T, and switches the switch circuits 27A and 28A to the
extension call side terminal IT. Then, in the voice signal processing unit 20B, the control unit 40
switches the switch circuits 23B and 26B to the call side terminal T, and switches the switch
circuits 27B and 28B to the domestic call side terminal IT. FIG. 11 shows the switching state of
the switch circuits 23A, 26A, 27A, 28A, 23B, 26B, 27B, 28B at this time.
[0134]
Further, the control unit 40 controls the attenuation amount of the attenuation unit 33LA of the
audio signal processing unit 20A and the attenuation unit 33RB of the audio signal processing
unit 20B to -20 dB. Further, the control unit 40 controls the attenuation amount of the
attenuation unit 33RA of the audio signal processing unit 20A and the attenuation unit 33LB of
the audio signal processing unit 20B to -10 dB.
[0135]
The transmission voice signal of the user 3A picked up by the microphone 2A by the switching of
the switch circuit described above is transmitted through the microphone amplifier 21A → low
pass filter 22A → switch circuit 23A → switch circuit 27A. Supplied to
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33
[0136]
Then, the audio signal processing unit 20B supplies the audio signal from the audio signal
processing unit 20A to the speaker 1RB in the path of switch circuit 28B → switch circuit 26B →
mixing circuit 36B → volume control volume 34RB → power amplifier 35RB, Play sound.
[0137]
Thereby, the transmission voice from the user 3A is reproduced together with the sound signal of
the attenuated music source by the speaker 1RB in the vicinity of the user 3B's ear.
[0138]
Also, the transmission voice signal of the user 3B collected by the microphone 2B is supplied to
the voice signal processing unit 20A of the other party through the path of the microphone
amplifier 21B → low pass filter 22B → switch circuit 23B → switch circuit 27B.
[0139]
Then, the audio signal processing unit 20A supplies the audio signal from the audio signal
processing unit 20B to the speaker 1LA through the path of switch circuit 28A → switch circuit
26A → mixing circuit 36A → volume control volume 34LA → power amplifier 35LA, Play sound.
[0140]
As a result, the transmission voice from the user 3B is reproduced together with the attenuated
audio signal of the music source by the speaker 1LA near the user 3A's ear.
[0141]
Thus, the same conversation as the extension call can be performed between the users 3A and 3B
in a hands-free manner.
In this case, in this embodiment, the microphones 2A and 2B are disposed on the left ear side of
the user 3A and on the right ear side of the user 3B and arranged so as to be farther from each
other. The prevention effect is high.
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34
[0142]
Fifth Embodiment (On-vehicle Audio System) The fifth embodiment is a development of the
fourth embodiment.
The fourth embodiment is a case where the sound reproduction apparatus with hands-free
function of the present invention is applied to the driver's seat and the passenger's seat.
In the fifth embodiment, assuming a sedan-type four-seater car, the acoustic reproduction with
hands-free function of the present invention is applied not only to the driver's seat and the front
passenger seat but also to the two rear seats. Make the device apply.
[0143]
FIG. 13 is a block diagram showing an example of the configuration of the car audio system of
the fifth embodiment.
In FIG. 13, the same parts as those of the fourth embodiment described above are denoted by the
same reference numerals.
[0144]
In FIG. 13, the user 3A sits in the front passenger seat, the user 3B sits in the driver seat, the user
3C sits in the rear of the passenger seat, and the user 3D sits in the rear of the driver seat. .
Then, left channel speakers 1LA, 1LB, 1LC, 1LD are attached to the left side of a headrest portion
(not shown) of a chair on which each user 3A, 3B, 3C, 3D sits.
Also, right channel speakers 1RA, 1RB, 1RC, 1RD are attached to the right side of the headrest
portion of the chair in which each user 3A, 3B, 3C, 3D sits.
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35
[0145]
These left and right channel speakers 1LA, 1LB, 1LC, 1LD and 1RA, 1RB, 1RC, 1RD are naked
speakers.
[0146]
Then, in this embodiment, for the user 3A of the front passenger seat, the transmitter (user 3A)
transmits the sound wave radiated from the speaker 1LA of the left channel at an arbitrary
position in the zero sound pressure zone Zo. A microphone 2A for collecting speech sound is
arranged.
Similarly, for the user 3C at the rear seat of the front passenger seat, the speaker (user 3C)
transmits the sound wave emitted from the speaker 1LC of the left channel at an arbitrary
position in the zero sound pressure zone Zo. A microphone 2C for sound collection is arranged.
[0147]
In addition, for the user 3B at the driver's seat, with regard to the sound wave radiated from the
speaker 1RB in the right channel, the transmission voice of the talker (user 3B) is collected at an
arbitrary position in the zero sound pressure zone Zo. Microphone 2B is arranged. Similarly, also
for the user 3D at the back seat of the driver's seat, with respect to the sound wave radiated from
the speaker 1RD of the right channel, the transmitter of the talker (user 3D) at an arbitrary
position in the zero sound pressure zone Zo. A microphone 2D for sound collection is arranged.
[0148]
Also in this embodiment, the microphones 2A, 2B, 2C, 2D are fixed to the outer peripheral frame
portions of the diaphragms of the speakers 1LA, 1LC, 1RB, 1RD to be the sound pressure zero
area Zo, and the sound pressure is zero. The microphones 2A to 2D are arranged in the area Zo.
[0149]
As described above, the reason why the microphones 2A and 2B and the microphones 2C and 2D
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36
are divided into right and left channels is that, as described above, the voices of the adjacent
users arranged side by side are collected. To prevent as much as possible.
Thus, the howling prevention effect can be enhanced in combination with the installation
positions of the microphones 2A to 2D.
[0150]
In this embodiment, each of the four-seat users individually enjoys the music source, talks with
the other party via the mobile phone network, and then talks (extension call) with one or more of
the four seats. It is configured to be able to.
[0151]
The multi-switching box 70 is provided for that purpose and, as shown in FIG. 14, includes the
control unit 40 described above, and performs audio signal processing for each of the users 3A,
3B, 3C, 3D of each seat. The units 20A, 20B, 20C, and 20D are provided.
Further, the multi-switching box 70 includes an extension switching circuit 81.
[0152]
As shown in FIG. 14, for each of the voice signal processing units 20A, 20B, 20C, 20D, mobile
phone terminals 4A, 4B, 4, C, 4D for communicating with an external party through a mobile
phone network are available. It is possible to connect.
[0153]
Further, voice input / output signals for extension calls from the voice signal processing units
20A, 20B, 20C, 20D (for example, signals obtained at the extension call side terminal IT of the
switch circuit 27A and the switch circuit 28A of FIG. 9) are All are supplied to the extension
switching circuit 71.
[0154]
The extension switching circuit 71 switches the extension communication path in accordance
with the control signal from the control unit 40.
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37
[0155]
And as shown in FIG. 13, operation button group 41A, 41B, 41C, 41D is provided with respect to
each user 3A, 3B, 3C, 3D of each seat.
Operation signals from these operation button groups 41A, 41B, 41C, 41D are supplied to the
control unit 40 provided in the multi-switching box 70.
[0156]
The control unit 40 determines which of the operation button groups 41A, 41B, 41C, and 41D
has been operated, and further determines which operation button of the determined operation
button group is operated.
Then, the control unit 40 performs control according to the determination result.
[0157]
In this embodiment, each of the operation button groups 41A, 41B, 41C, 41D includes operation
buttons as shown in FIG.
That is, as in the fourth embodiment described above, the operation button groups 41A, 41B,
41C, 41D are respectively the telephone button 61, the CD button 62, the HDD button 63, the
broadcast button 64, the volume control knob 65, A conversation button 66 is provided. In the
fifth embodiment, four partner designation buttons 671, 672, 673, which are further associated
with the conversation button 66 and are used to designate any one or more of the other three
seats as conversation targets. 674 are provided.
[0158]
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38
Note that among the four other party specification buttons, the three other party specification
buttons 671, 672, and 673 are preset so as to specify another seat that is different for each seat.
The remaining one partner designation button 674 among the four partner designation buttons
is an operation button for designating all the other three seats as a partner.
[0159]
Seat sensors 43A, 43B, 43C and 43D are provided for the seats of the users 3A, 3B, 3C and 3D,
respectively. The seating detection outputs of the seating sensors 43A, 43B, 43C, 43D are
supplied to the control unit 40 of the multi-switching box 70. The control unit 40 processes the
audio signal corresponding to the seat at which the user is seated among the audio signal
processing units 20A, 20B, 20C, 20D based on the seating detection output of the seating
sensors 43A, 43B, 43C, 43D. Power is supplied only to the unit to control its operation.
[0160]
Each of the audio signal processing units 20A, 20B, 20C, and 20D includes music source
selection units 32A, 32B, 32C, and 32D (not shown). Therefore, each of the users 3A, 3B, 3C, 3D
can reproduce and enjoy the music source selected by each of the operation button groups 41A,
41B, 41C, 41D.
[0161]
That is, for example, when the user 3A presses the CD button 62 of the operation button group
41A, the control unit 40 detects it, and the music source selection unit 32A of the audio signal
processing unit 20A is switched from the CD player 31C. Control to select the audio signal of the
channel. Also, for example, when the user 3B presses the HDD button 63 of the operation button
group 41B, the control unit 40 detects it and sets the music source selection unit 32B of the
audio signal processing unit 20B to two channels from the HDD 31H. Control to select audio
signal. The same applies to other user's selection button operations.
[0162]
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39
In addition, each user 3A, 3B, 3C, 3D presses the telephone button 61, whereby the user's mobile
phone terminal 4A, 4B, 4C is connected to each of the voice signal processing units 20A, 20B,
20C, 20D. , 4D, it is possible to make a call with the other party through the mobile phone
network. The operation at this time has been described in the fourth embodiment and is thus
omitted.
[0163]
Then, in the fifth embodiment, when the conversation button 66 is depressed and one of the
other party designation buttons 671, 672, 673 is depressed, the other party of the seat
designated by the depressed other party designation button Can talk (internal calls).
[0164]
For example, it is assumed that the user 3A depresses the conversation button 66 in the
operation button group 41A and then depresses the partner designation button 671 set to
designate the user 3B.
In this case, the control unit 40 detects a button pressing operation on the operation button
group 41A by the user 3A, and the extension switching circuit 71 (see FIG. 14) is an extension of
the audio signal processing unit 20A and the audio signal processing unit 20B. Control to
connect the call path. Thus, conversation can be made between the user 3A and the user 3B.
[0165]
Also, for example, after the user 3A presses the conversation button 66 in the operation button
group 41A, the user 3A is set to specify the other party specifying button 671 set to specify the
user 3B and the user 3C. It is assumed that the other party designation button 672 that has been
pressed is pressed. In this case, the control unit 40 detects a button pressing operation on the
operation button group 41A by the user 3A, and the extension switching circuit 71 is used as an
extension call path by three parties in the audio signal processing units 20A, 20B and 20C.
Control to connect. Thus, conversation can be made between the user 3A, the user 3B and the
user 3C.
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40
[0166]
Further, for example, after the user 3A presses the conversation button 66 in the operation
button group 41A, it is assumed that the other party designation button 674 set so as to
designate all the other users is pressed. In this case, the control unit 40 detects a button pressing
operation on the operation button group 41A by the user 3A, and the extension switching circuit
71 is set to the extension call path by all of the voice signal processing units 20A, 20B, 20C and
20D. Control to connect. Thereby, conversation can be performed among all of the user 3A, the
user 3B, the user 3C, and the user 3D.
[0167]
Also in this example, as described above, the conversation request (extension call request) to the
non-seated user is invalidated based on the seating detection output of the seating sensors 43A,
43B, 43C, 43D. Then, as described above, the user is notified of the conversation request by an
alarm buzzer sound or the like. However, when a request for conversation with more than one
person is made and the user of that part of the seat is not seated, it is possible to have a
conversation with the seated user and the presence of a non-seated user The buzzer sound to
notify may be omitted.
[0168]
Also in the above-described fifth embodiment, while playing back music, the effect of being able
to prevent an external user from making a telephone call or an extension call (conversation) with
an external partner through a mobile telephone terminal is described in the above-described
embodiment. It goes without saying that it can be obtained just like the form.
[0169]
Sixth Embodiment The sixth embodiment is an example in which a microphone for hands-free
communication is also used as a microphone for picking up noise in order to reduce ambient
external noise.
That is, in the hands-free call mode, the microphone 2 used for transmitting and collecting
speech is also used as a microphone for picking up ambient external noise in the music source
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41
reproduction mode.
[0170]
FIG. 16 is a block diagram of a configuration example of the sound reproduction device with
hands-free calling function of the sixth embodiment. The example of FIG. 16 is the case where
the fifth embodiment is applied to the configuration of the third embodiment shown in FIG. 8,
and the same reference numerals as in the respective parts in FIG. It shall be attached.
[0171]
As shown in FIG. 16, in this embodiment, the speaker 1L for the left channel is used as a speaker
for reproducing a reception voice signal in the hands-free call mode. Then, a microphone 2L is
provided in the zero sound pressure region for the sound emitted from the left channel speaker
1L, and this microphone 2L is used as a microphone for collecting a transmission voice signal in
the hands-free call mode.
[0172]
The transmission voice signal collected by the microphone 2L is supplied to the switching
terminal (input terminal) of the switch circuit 23M through the microphone amplifier 21L and
the low pass filter 22. Then, in this embodiment, the voice signal from the microphone 2L
through the low pass filter 22 is transmitted from the call side terminal (output terminal) T of the
switch circuit 23M through the voice signal output terminal 24 and transmitted voice of the
mobile phone terminal 4 It is supplied to the input terminal.
[0173]
Further, in this embodiment, the audio signal from the microphone 2L which has passed through
the low pass filter 22 is supplied to the audio recognition circuit 42 through the music
reproduction side terminal (output terminal) M of the switch circuit 23M.
[0174]
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42
Further, in this embodiment, the microphone 2L is used as a microphone for picking up ambient
noise with respect to the audio signal of the left channel in the music source reproduction mode.
Then, in this embodiment, the microphone 2R is provided in the zero sound pressure region for
the emitted sound also for the right channel speaker 1R. Then, this microphone 2R is used as a
microphone for collecting ambient noise with respect to the sound signal of the right channel in
the music source reproduction mode.
[0175]
Then, external noises coming from noise sources around the user 3, such as tire noise and engine
noise, are picked up by the microphones 2L and 2R. Audio signals of external noise obtained
through the acoustic-electrical conversion by the microphones 2L and 2R are supplied to the low
pass filters 81L and 81R through the microphone amplifiers 21L and 21R, respectively.
[0176]
Then, the output voice signals of the low pass filters 81L and 81R are respectively supplied to
the noise reduction filter circuits 82L and 82R to generate noise reduced voice signals. The noise
reduction audio signal from the filter circuit 82L is supplied to the mixing circuit 36L, and is
supplied to the speaker 1L through the volume control volume 34L and the power amplifier 35L.
[0177]
Further, for the right channel, in this embodiment, a mixing circuit 36R is provided between the
attenuation unit 33R and the volume adjustment volume 34R. Then, the noise reduction audio
signal from the filter circuit 82R is supplied to the mixing circuit 36R, and is supplied to the
speaker 1R through the volume adjustment volume 34R and the power amplifier 35R.
[0178]
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43
The low pass filters 81L and 81R are provided for the following reasons. That is, as described
above, among the sounds emitted from the front and back of the diaphragm of the bare speaker
1, particularly for low frequencies, the effect of canceling out the sound from the front and rear
of the diaphragm is large. The middle and high frequency components of the sound coming from
the front and back of the diaphragm of the bare speaker 1 are greatly attenuated in the zero
sound pressure zone Zo, but not completely zero.
[0179]
Therefore, in this embodiment, in order to reduce the noise more reliably, the noise reduction
target is almost completely canceled when the low-pass filters 81L and 81R are arranged in the
above-described zero sound pressure zone Zo. And the sound pressure is limited to only the low
frequency component which becomes zero. This makes it possible to stably reduce noise without
howling. The cutoff frequency in the low pass filters 81L and 81R is, for example, a frequency of
300 Hz or less, in this example, 300 Hz.
[0180]
The filter circuits 82L and 82R are basically for inverting the phase of an audio signal of external
noise to generate a noise reduced audio signal. Also, the filter circuits 82L and 82R are corrected
in consideration of the space transfer function between the external noise source position and
the listening position (noise cancel point) of the user 3 who should cancel the noise, and in the
microphone amplifier and the power amplifier. It is intended to correct the characteristics. The
filter circuits 82L and 82R are configured using digital filters in this example.
[0181]
That is, although not shown, the filter circuits 82L and 82R each include an A / D conversion
circuit for converting analog audio signals from the low pass filters 81L and 81R into digital
audio signals. The filter circuits 82L and 82R each include a digital filter including, for example,
an FIR (Finite Impulse Response) filter that receives the digital audio signal from the A / D
conversion circuit. Furthermore, the filter circuits 82L and 82R each include a D / A conversion
circuit that converts the digital audio signal processed by the digital filter into an analog audio
signal.
10-05-2019
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[0182]
Then, as the filter coefficients of the digital filters of the filter circuits 82L and 82R, the phase of
the input voice signal is inverted, and the above-described space transfer function, the
characteristics of the microphone amplifiers 21L and 21R, and the power amplifiers 35L and
35R are corrected. The value of is supplied.
[0183]
In this embodiment, as described above, although the noise reduction target is limited to the low
frequency component, the low frequency sound region is a region where there is no sense of
human direction, so the filter described above is used. The correction by the space transfer
function by the circuits 82L and 82R may be omitted.
Therefore, only the phase inverting circuit may be provided, and the filter circuits 82L and 82R
in FIG. 16 may not be provided. However, in consideration of performing correction for the
characteristics of the microphone amplifiers 21L and 21R and the power amplifiers 35L and 35R
described above, the filter circuits 82L and 82R should be provided within the correction range.
Good.
[0184]
With the above configuration, noise reduced noise is emitted from the speakers 1L and 1R. Here,
since the noise reduction speech signal is a phase inversion of the speech signal of the external
noise, the noise reduction sound has a phase opposite to that of the external noise Nz. Therefore,
in the ear of the user 3, as a result of combining the external noise and the noise reduced sound
in the reverse phase of the external noise, the external noise is reduced or canceled.
[0185]
The noise reduction device having the configuration of FIG. 16 is a so-called feed forward noise
reduction device. The noise reduction operation of this feedback type noise reduction device will
be described using a transfer function with reference to FIG. FIG. 17 is a block diagram showing
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45
each part using its transfer function, corresponding to the block of the noise reduction
processing system shown in FIG.
[0186]
In FIG. 17, A is a transfer function of power amplifiers 35L and 35R, D is a transfer function of
speakers 1L and 1R as a driver, and M is a transfer function corresponding to microphones 2L
and 2R and microphone amplifiers 21L and 21R. . Also, -.alpha. Is a transfer function of a filter
designed for noise reduction in the feedforward scheme, and includes phase inversion. F is a
space transfer function from the position of the external noise source to the position of the
cancellation point at the listener's ear.
[0187]
When expressed as shown in FIG. 17, the sound pressure P at the cancellation point of the ear of
the user 3 in the noise reduction device having the block configuration of FIG. 16 is P = -ADMαN
+ FN + ADS. (Equation 1)
[0188]
Here, if it is assumed that the space transfer function F is F ≒ ADMα (2), that is, if the transfer
function −α of the filter circuit 13 is designed to satisfy (2), The above (formula 1) becomes P
PADS (formula 3).
[0189]
Therefore, the sound pressure P at the cancellation point is such that noise is canceled and only
the music source S is present.
In equation (3), if music source S = 0, that is, if there is no music source, then P ≒ 0, and sound
pressure P at the cancellation point means that noise is canceled and does not exist. It will be.
[0190]
The operations other than the noise cancellation operation are completely the same as those of
the above-described third embodiment, and the above-described effects can be obtained.
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46
[0191]
[Other Embodiments] In the above-described embodiment, the left and right two-channel audio
signals from the music source are supplied as they are to the left and right speakers.
Therefore, the sound image may be localized near the head.
However, by applying virtual sound image localization processing using head related transfer
functions to audio signals of left and right two channels from a music source, stereo sound
images of left and right two channels can be virtual sound image in front of the user (listener) It
can also be localized.
[0192]
That is, for example, in FIG. 5, a virtual sound image localization processing unit is provided on
the output side of the source selection circuit 32 and on the front stage of the attenuation units
33L and 33R. Then, while installing the left and right speakers in front of the user and collecting
the sound wave from the installed speaker by the user or microphones installed near both ears of
the dummy head, the head transfer function is measured. Keep it. Then, in the virtual sound
image localization processing unit, the measured head related transfer function is convoluted
with the audio signals of two channels. As a result, the virtual sound image is localized in front of
the user 3 by the emitted sound from the speakers 1L and 1R placed near the user's binaural
ears and at the rear, and the user 3 places two-channel audio in front. You can listen as if it were
emitted from the left and right speakers.
[0193]
Note that according to this virtual sound image localization processing, it is also possible to use
the two speakers 1L and 1R to perform virtual sound image localization of multi-surround of 5.1
channels, for example. In that case, the 5.1 channel surround sound signal is subjected to virtual
sound image localization processing to be sound of two channels, and the sound signals of the
two channels are respectively supplied to the speakers 1L and 1R.
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[0194]
Therefore, the two speakers 1L and 1R are not limited to only the left and right channels of twochannel stereo sound.
[0195]
Next, in the above-described embodiment, as shown in FIG. 18A, the left and right speakers 1L
and 1R of the user face the vibration surface of the diaphragm with the right and left ears of the
user 3, respectively. In the above-mentioned example, it fixed in the state where it is slanted to
the long side direction of headrest part 7 of the chair in which user 3 sits.
[0196]
However, when the speakers 1L and 1R are installed in an oblique direction, the distance
between the speakers 1L and 1R is expanded, which may deteriorate the visibility of the rear for
the driver.
[0197]
Therefore, in the case of the driver's seat, as shown in FIG. 18B, the headrest 7 is arranged so
that the vibration plane of the diaphragms of the speakers 1L and 1R is in a direction parallel to
the long side direction of the headrest. Attach.
FIG. 18B shows a state in which the speakers 1L and 1R are embedded in the headrest portion 7
in the state of a naked speaker.
[0198]
Further, as shown in FIG. 18C, even if the speaker configuration is a so-called 3D system
configured of a woofer 1W and two left and right small high-range speakers 1Ls and 1Rs. good.
In this case, the woofer 1W is supplied with, for example, an addition signal of low-frequency
components of audio signals of the left and right channels.
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Further, an audio signal obtained by high-pass filtering audio signals of left and right channels,
for example, is supplied to each of the two small-sized high-range speakers 1Ls and 1Rs.
[0199]
In the case of the example of FIG. 18C, the vibration plane of the diaphragm of the left and right
small high-range speakers 1Ls and 1Rs is in an oblique direction so as to face the user's left and
right ears. Will be placed. However, since the speakers 1Ls and 1Rs are for small high-frequency
use and the aperture of the diaphragm is small, the rear visibility is better than in the case of FIG.
18A.
[0200]
Moreover, in the above-mentioned embodiment, the microphone for hands-free speech was
provided only in one of two speakers on either side. However, as shown in FIGS. 18A, 18B, and
18C, the microphones 2L and 2R may be provided for both the left and right speakers, and one
of them may be selected and used. .
[0201]
In the case of FIG. 18C, the woofer 1W is not provided with a microphone, and the microphones
2L and 2R are provided for the left and right small-sized high-frequency speakers 1Ls and 1Rs.
[0202]
Also, both of the two microphones 2L and 2R provided for the left and right speakers 1L and 1R
can be used as a microphone for hands-free communication.
In FIG. 19, the left and right speakers 1L and 1R are provided in the headrest portion 7 of the
business chair 6, and the microphones 2L and 2R are provided in the frame (sound pressure zero
area) of the speakers 1L and 1R. Is shown.
10-05-2019
49
[0203]
In this case, the left speaker 1L and the microphone 2L are configured for hands-free
communication on the first telephone line, and the right speaker 1R and the microphone 2R are
configured for hands-free communication on the second telephone line. Do. That is, two
telephone lines are provided, the left speaker 1L and the microphone 2L are connected for
hands-free communication with one of the lines, and the right speaker 1R and microphone 2R
are connected for the hands-free communication with the other line. Make it
[0204]
The operator sitting on the chair 6 can make hands-free calls to both the first line and the second
line by changing the face. In this case, simultaneous hands-free calling is also possible for both
the first line and the second line. Therefore, the apparatus of the configuration of FIG. 19 is
suitable for hands-free calls of a call center telephone answering operator. In this case, since the
example of FIG. 19 is for telephone response, it is not necessary to provide a signal processing
system for reproducing the music source.
[0205]
[Effects of the Embodiment] According to the hands-free calling device and the sound
reproducing device with the hands-free calling function of the embodiments described above,
hands-free calling can be performed while preventing howling with a simple hardware
configuration. Conventionally, in an in-vehicle apparatus or the like, it has been troublesome to
attach a microphone for hands-free communication to a sun visor or a steering wheel.
[0206]
On the other hand, according to the above-described embodiment, the microphone is attached to
the frame portion which is the sound pressure zero area of the speaker, and the speaker is
attached to the headrest portion, so such inconvenience is improved. .
[0207]
In addition, in the headphone-type hands-free communication device, since the headphones had
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50
to be attached, there were problems such as discomfort or unsanitary due to the headphones
coming into contact with the body.
[0208]
On the other hand, in this embodiment, since the speaker and the microphone are fixed to a
headrest or the like in the vicinity of the user, such a problem is eliminated.
[0209]
And, since the speaker is arranged near the user's ear, the acoustic energy may be small, and
even in a narrow space such as a car, the hands-free call with howling prevented is performed
with less influence on the other be able to.
[0210]
Further, in the above-described embodiment of the hands-free voice communication functionequipped sound reproduction apparatus, the music source can be individually selected by each
user, and the volume can also be individually adjusted.
Then, in the case of hands-free calling, the music source is attenuated so that hands-free calling
while listening to the music source is possible.
[0211]
Further, as in the third embodiment, there is also an effect that the microphone for hands-free
communication can be used for voice recognition in the music reproduction mode.
[0212]
There is also an effect that the microphone for hands-free communication can also be used for
collecting external noise for performing noise cancellation in the music reproduction mode.
[0213]
[Other Modifications] In the above-described embodiment, in the hands-free call mode, the
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51
hands-free call is performed while listening to the music source.
However, in the hands-free call mode, audio signals of two channels from the music source unit
may be controlled not to be supplied to the speakers 1L and 1R.
That is, in the hands-free call mode, the output level of the audio signal from the music source
unit 30 may be attenuated to zero (the amount of attenuation is −)), or the generation may be
stopped. The audio signal from the unit 30 may be muted.
[0214]
Further, in the above-described embodiment, the transmission voice of the hands-free call is
transmitted through the microphone amplifier and the low pass filter, and the reception voice is
made to pass through the power amplifier.
However, depending on the type of mobile phone terminal and the connection method with the
mobile phone terminal, the microphone amplifier and the low pass filter, or the power amplifier
can be omitted.
[0215]
In the above-described embodiment, although the outside party makes a call through the mobile
telephone network, the telephone network is not limited to the mobile telephone network, and
the telephone network may be a call through a subscriber telephone network or another
telephone network. Of course it is possible.
[0216]
In addition, the sound reproduction device with the hands-free call function can be configured
not only in the above-described on-vehicle audio system but also as a device for home use, for
example.
[0217]
In the above-mentioned embodiment, although the operation button group showed the state
connected by a wire connection, it is needless to say that the operation button group may be
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52
provided in a remote control transmitter.
[0218]
FIG. 1 is a block diagram of a configuration example of an embodiment (first embodiment) of a
hands-free communication device according to the present invention.
FIG. 7 is a view for explaining the arrangement positions of a speaker and a microphone for
hands-free communication in the embodiment of the hands-free communication device according
to the present invention.
FIG. 7 is a diagram used to explain the arrangement positions of a speaker and a microphone for
hands-free communication in the embodiment of the hands-free communication device according
to the present invention.
FIG. 7 is a diagram showing an example of arrangement positions of a speaker and a microphone
for hands-free communication in the embodiment of the hands-free communication device
according to the present invention.
It is a block diagram which shows the structural example of embodiment (2nd Embodiment) of
the sound reproduction apparatus with the hands-free telephone call function by this invention.
It is a figure which shows the example of the arrangement position of the speaker in the 2nd
Embodiment of this invention, and a microphone. It is a figure which shows the example of the
operation button group in 2nd Embodiment of this invention. It is a block diagram which shows
the structural example of embodiment (3rd Embodiment) of the sound reproduction apparatus
with the hands-free telephone call function by this invention. It is a block diagram which shows
the structural example of embodiment (4th Embodiment) of the sound reproduction apparatus
with the hands-free telephone call function by this invention. It is a block diagram which shows
the structural example of embodiment (5th Embodiment) of the sound reproduction apparatus
with the hands-free telephone call function by this invention. It is a figure for demonstrating the
communication between apparatuses (extension call) in the 5th Embodiment of this invention. It
is a figure which shows the example of the operation button group in the 5th Embodiment of this
invention. It is a block diagram which shows the structural example of embodiment (sixth
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53
embodiment) of the sound reproduction apparatus with a hands-free telephone call function by
this invention. It is a figure for demonstrating the communication between apparatuses
(extension call) in 6th Embodiment of this invention. It is a figure which shows the example of
the operation button group in 6th Embodiment of this invention. It is a block diagram which
shows the example of a structure of other embodiment of the sound reproduction apparatus with
hands-free telephone call function by this invention. It is a figure used in order to demonstrate
the principal part of the sound reproduction apparatus with the hands-free telephone call
function of embodiment of FIG. FIG. 14 is a diagram for explaining another example of
arrangement positions of a speaker and a microphone for hands-free communication in the
embodiment of the present invention. It is a figure which shows the arrangement | positioning
position example of the speaker for microphones and hands-free communication in other
embodiment of the hands-free communication apparatus by this invention. It is a figure for
demonstrating an example of the conventional hands-free in-vehicle communication apparatus. It
is a figure for demonstrating the other example of the conventional in-vehicle hands-free
communication apparatus.
Explanation of sign
[0219]
1 ... naked speaker, 2 ... microphone, 3 ... user, 4 ... mobile phone terminal
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