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JP2018014588

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DESCRIPTION JP2018014588
Abstract: The present invention provides a hands-free talking device for an emergency
notification system with a built-in speaker and microphone, in which the speaker and the
microphone are housed in the same housing while reducing the influence of the speaker on the
microphone. A communication device 20 has microphones M1 and M2 arranged at positions
symmetrical with respect to a microphone M with respect to a center line CL in a width direction
of a housing 30, and microphones M1 and M2 with respect to a speaker SP. The microphone M3
disposed at a position on the center line CL closer than M2 and connected to the microphones
M1 and M3 has strong directivity in two directions perpendicular to the center line CL and is
along the center line CL An audio signal output from the microphone M3 from an audio signal
output from the beam former 102 connected to the beam former 102 forming the bidirectionality 102c with weak directivity in two directions, the beam former 102 and the
microphone M3 And a voice processing unit 100 provided with an echo cancellation unit 103 for
removing the [Selected figure] Figure 16
Hands-free calling device for emergency call system
[0001]
The present invention relates to a hands-free communication device for an emergency
notification system, and more particularly to a hands-free communication device for an
emergency notification system in which a speaker and a microphone are housed in the same
housing.
[0002]
03-05-2019
1
There is known an emergency notification system that connects an emergency call center and a
telephone line when an emergency occurs in a vehicle or a passenger (see, for example, Patent
Document 1).
In such an emergency call system, the vehicle occupant can talk with the operator of the
emergency call center hands-free using the speaker and the microphone installed in the vehicle
room, but when the call sound from the speaker gets into the microphone, An echo canceller
using an adaptive filter is used because the echo returns to the other party with time delay and it
becomes difficult to make a call.
[0003]
In such an emergency call system, the speaker and the microphone are separately installed in the
vehicle compartment, and the distance between the speaker and the microphone differs
depending on the vehicle type, so it is necessary to adjust the voice processing such as echo
canceller according to the vehicle type there were.
[0004]
Therefore, in such an emergency notification system, the speaker and microphone are integrated
with the speaker and the microphone in the same housing, and the distance between the speaker
and the microphone is fixed at a fixed level regardless of the vehicle type, and the voice
processing is performed by the vehicle type There is a need for a hands-free device for an
emergency call system that does not need to be adjusted to suit.
[0005]
JP, 2009-290789, A
[0006]
However, in a speaker-microphone integrated hands-free device for an emergency call system in
which such a speaker and a microphone are housed in the same housing, the distance between
the speaker and the microphone is short, so echoes from the speaker to the microphone increase
Control of the echo canceller becomes difficult.
03-05-2019
2
In addition, the vibration from the speaker is easily transmitted to the microphone through the
housing.
As described above, in the speaker-microphone integrated type hands-free communication device
for an emergency notification system in which the speaker and the microphone are housed in the
same housing, there is a problem that the microphone is strongly affected by the speaker and the
sound quality is easily deteriorated.
[0007]
The present invention has been made in view of such a problem, and its object is to reduce the
influence of the speaker on the microphone and store the speaker and the microphone in the
same housing. It is to provide a hands-free calling device for mobile phones.
[0008]
1.
A housing installed in a passenger compartment, a speaker housed in the housing and a speaker
for outputting a reception voice of a calling party from one surface of the housing, and a speaker
housed in the housing and audio from the one surface of the housing Microphones for collecting
sound, the microphones being first and second non-directionally disposed at axially symmetrical
positions with one line segment extending in the radial direction from the center of the
diaphragm of the speaker as the axis of symmetry A first omnidirectional microphone and a third
nondirectional microphone arranged at the position on the symmetry axis closer to the speaker
than the first and second nondirectional microphones, A beam former unit connected to the two
omnidirectional microphones, the directivity in two directions perpendicular to the symmetry
axis being strong, the directivity in two directions along the symmetry axis forming a weak bidirectivity; A beam former connected to the third omnidirectional microphone; A hand for an
emergency notification system, further comprising: a voice processing unit provided with an echo
cancellation unit that removes the voice signal output from the third nondirectional microphone
from the voice signal output from the microphone unit. Free talker.
According to the hands-free device for an emergency call system, the voice processing unit has
strong directivity in two directions perpendicular to the symmetry axis by the beam former
connected to the first and second nondirectional microphones, Since the directivity in two
03-05-2019
3
directions along the symmetry axis forms weak bi-directionality, that is, weakens the directivity
in the direction of the speaker of the microphone, it is possible to reduce the echo from the
speaker to the microphone. Furthermore, the audio processing unit further generates an audio
signal output from the third nondirectional microphone from an audio signal output from the
beam former unit by the echo cancellation unit connected to the beamformer unit and the third
nondirectional microphone. Since the removal is performed, only the voice uttered by the
occupant can be extracted with high quality. 2. In the central portion of the ceiling between
the left and right sun visors in the vehicle compartment, the housing faces downward, the
microphone is positioned behind the speaker, and the symmetry axis is in the longitudinal
direction of the vehicle. The hands-free communication device for an emergency call system
according to 1, which is arranged in an extended state. According to this hands-free device for
emergency call system, the directivity in the front and rear direction is weakened and the
directivity in the left and right direction is enhanced as viewed from the center of the ceiling
between the left and right sun visors in the vehicle compartment. The voice of the crew can be
collected. 3. A sound emission hole provided at a position facing the diaphragm of the speaker,
a microphone housing recess for housing the microphone, a microphone cover for covering the
microphone housing recess, and the microphone on the one surface of the housing The handsfree communication device for emergency call system according to 1, wherein a sound collection
hole provided in the cover is provided. According to the hands-free communication device for an
emergency notification system, the microphone can be stored in the microphone storage recess
from one side of the housing, so that the assembly is simplified. 4. The hands-free
communication device for an emergency notification system according to 3, wherein the
microphone housing recess is provided with first, second and third microphone housings for
separately housing the microphones. According to this hands-free calling device for an
emergency notification system, the microphone can be easily positioned. 5. The microphone is
housed in the first, second and third microphone housings together with the microphone in a
state of being fitted to the outer periphery of the microphone, and the outer peripheral surface of
the microphone and the first, second and third microphone housings 4. The hands-free
communication device for an emergency notification system according to 4, wherein a
microphone holder made of an elastic material is interposed between the inner peripheral
surface and the microphone holder.
According to the hands-free communication device for an emergency notification system, the
vibration from the speaker transmitted to the microphone through the housing can be reduced
by the microphone holder. 6. The microphone cover is provided with first, second and third
microphone storage portions for separately storing the microphones in a state of projecting from
the inner surface of the microphone cover, and for fixing the microphone cover to the
microphone storage recess The hands-free communication device for an emergency notification
system according to 3, wherein a cushion material having adhesiveness on both sides is provided,
and a gap is provided between the microphone storage recess and the microphone cover.
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4
According to the hands-free communication device for an emergency notification system, the
cushioning material can reduce the vibration from the speaker transmitted to the microphone
through the housing. 7. A cushioning material having air permeability that can be fitted in the
microphone housing recess is provided, and the cushioning material is provided with first,
second, and third microphone housings for separately housing the microphones. Hands-free
calling device for emergency call system as described in. According to the hands-free
communication device for an emergency notification system, the cushioning material can reduce
the vibration from the speaker transmitted to the microphone through the housing. 8. The
microphone according to claim 1, wherein the microphone is installed in a state where the
diaphragm of the microphone vibrates in two directions perpendicular to the vibration direction
of the diaphragm of the speaker. . According to the hands-free communication device for an
emergency notification system, the influence on the microphone by the vibration from the
speaker transmitted to the microphone through the housing can be reduced.
[0009]
According to the present invention, it is possible to provide a speaker-microphone integrated
type hands-free talking device for an emergency notification system in which the speaker and the
microphone are housed in the same housing while reducing the influence of the speaker on the
microphone.
[0010]
It is a schematic block diagram of an emergency call system.
It is a block diagram of an emergency call device. FIG. 2 is a diagram showing an installation
state of the communication device of the first embodiment. (A) is an exploded perspective view
from above with the front of the communication device facing up, (B) is an exploded perspective
view from below with the front of the communication device facing up. It is a front view of a
speech apparatus. It is a side view of a speech apparatus. It is AA sectional drawing of FIG. It is a
BB sectional view of FIG. It is CC sectional drawing of FIG. It is sectional drawing which shows the
structure of a 1st, 2nd, 3rd nondirectional microphone. It is an exploded perspective view
showing the storage structure of a microphone in the state where the front of a talk device
turned up. FIG. 12 is a perspective view of the microphone cover, the microphone holder and the
microphone in the disassembled state of FIG. 11 as viewed from below. It is an exploded front
view showing the storage structure of the microphone, (A) is a front view of the microphone
storage recess (a front view of the microphone cover), and (B) is a microphone storage recess in a
state of making the microphone cover of (A) transparent. A front view, (C) is a front view of the
03-05-2019
5
mike storage concave part in the state where the mike holder and mike of (B) are made
transparent. It is a figure which shows the inner surface of a housing | casing, (A) is a rear view
of front case, (B) is a front view of a rear case. It is DD sectional drawing of FIG. It is a circuit
block diagram of an audio processing part. It is a front view which shows the directional
characteristic of a microphone. FIG. 7 is a front view of the communication device of Example 2;
It is an exploded perspective view showing the storage structure of a microphone in the state
where the front of a talk device turned up. FIG. 20 is a perspective view of the microphone cover,
the microphone holder, the microphone, the plate, and the cushion material in a disassembled
state of FIG. 19 as viewed from below. It is an exploded front view showing the storage structure
of the microphone, (A) is a front view of the microphone storage recess (a front view of the
microphone cover), and (B) is a microphone storage recess in a state of making the microphone
cover of (A) transparent. Front view, (C) is a front view of the microphone storage recess in a
state in which the microphone holder and microphone in (B) are transparent, (D) is a microphone
storage recess in a state in which the mounting plate and cushion material of (C) are transparent
It is a front view of. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC
sectional drawing of FIG. FIG. 16 is a cross-sectional view corresponding to FIG. 15 of the first
embodiment. FIG. 14 is a front view of the communication device of Example 3; It is an exploded
perspective view showing the storage structure of a microphone in the state where the front of a
talk device turned up. It is an exploded front view showing the storage structure of the
microphone, (A) is a front view of the microphone storage recess (a front view of the microphone
cover), and (B) is a microphone storage recess in a state of making the microphone cover of (A)
transparent. A front view, (C) is a front view of the microphone storage recess in a state in which
the sponge for pressing the microphone front face is made transparent, (D) is a sponge for fixing
the microphone, a microphone and a sponge for pressing the microphone back face in (C). It is a
front view of the microphone accommodation recessed part of the state made transparent.
It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. FIG. 16 is a cross-sectional
view corresponding to FIG. 15 of the first embodiment. FIG. 16 is a front view of the
communication device of Example 4; It is an exploded perspective view showing the storage
structure of a microphone in the state where the front of a talk device turned up. It is an
exploded front view showing the storage structure of the microphone, (A) is a front view of the
microphone storage recess (a front view of the microphone cover), and (B) is a microphone
storage recess in a state of making the microphone cover of (A) transparent. A front view, (C) is a
front view of the mike storing concave part in the state where the mike and the mike holder of
(B) are made transparent. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is
CC sectional drawing of FIG. FIG. 16 is a cross-sectional view corresponding to FIG. 15 of the first
embodiment.
[0011]
03-05-2019
6
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0012]
FIG. 1 shows a schematic configuration diagram of the emergency notification system 1.
The vehicle 2 is equipped with an emergency notification device 10 capable of wireless
communication with the emergency notification center 5 and is connected to the emergency
notification center 5 via the mobile telephone network or the base station 3 of the public
telephone network and the network 4 in an emergency. And the operator of the emergency call
center 5 can talk. Then, if necessary, the operator of the emergency notification center 5 requests
the fire service 6, the police 7 or the JAF 8 to rush the vehicle 2.
[0013]
FIG. 2 shows a block diagram of the emergency notification device 10. The emergency
notification device 10 is controlled by the emergency notification ECU 11. In the emergency
notification ECU 11, a GPS receiver 12 for detecting the position of the vehicle 2 by radio waves
from GPS satellites, an air bag switch 13 for detecting the operation of an air bag, and a call with
the emergency notification center 5 by the operation of the occupant A hands-free call device for
an emergency notification system (hereinafter referred to as “the communication start switch
14, the communication device 15 connected to the emergency call center 5 and the speaker SP
and the microphone M integrated with the speaker SP and the microphone M according to this
embodiment. It is called "talking device". ) 20 is connected.
[0014]
The emergency notification ECU 11 is configured as a computer including a CPU, a ROM, a RAM,
and an input / output interface.
[0015]
The communication device 15 is, for example, a data communication unit with a voice call
03-05-2019
7
function or a smartphone of an occupant.
When the communication device 15 performs data communication, the communication device
15 can establish a data link according to, for example, the PPP protocol, and can transmit and
receive data via the network 4 by the TCP / IP protocol or the like which is the upper layer. As a
result, in the event of an emergency, a data set including information such as the vehicle type
and fuel type registered in advance in the emergency notification ECU 11 and the position
information of the vehicle 2 acquired by the GPS receiver 12 is automatically transmitted to the
emergency notification center 5.
[0016]
When the communication device 15 is a smart phone, the emergency notification ECU 11 and
the communication device 15 are detachably connected by wire or wirelessly. In the case of
wired connection, the connection is made by, for example, a USB cable, and in the case of
wireless connection, the connection is made by, for example, Bluetooth (registered trademark)
communication standard.
[0017]
The emergency notification ECU 11 includes an input device such as a switch, relays an on-hook
/ off-hook instruction to the communication device 15 according to a user operation of the input
device, and performs a process of causing the communication device 15 to perform an on-hook /
off-hook operation.
[0018]
In an emergency, when the air bag switch 13 detects the air bag operation, or when the
communication start switch 13 is operated, the emergency notification ECU 11 sets the
telephone number registered in advance as the connection destination and performs an
emergency Connect to the report center 5
[0019]
The communication device 15 outputs a reception voice signal received from the emergency
notification center 5 via the network 4 to the emergency notification ECU 11, and transmits a
transmission voice signal input from the emergency notification ECU 11 to the emergency
notification center 5 via the network 4. Do.
03-05-2019
8
[0020]
The emergency notification ECU 11 outputs a reception voice signal input from the
communication device 15 to the communication device 20, and outputs a transmission voice
signal input from the communication device 20 to the communication device 15.
[0021]
FIG. 3 shows the installation state of the communication device 20. As shown in FIG.
The communication device 20 is disposed in the ceiling central portion 2c between the left and
right sun visors 2a and 2b in the vehicle compartment.
The figure shows an example incorporated in the overhead console 2d disposed in the ceiling
central portion 2c.
The overhead console 2d emits sound for receiving sound output from the speaker SP of the
built-in communication device 20 into the vehicle compartment and collects sound with a
microphone M of the communication device 20 containing voices uttered by the passenger (
Ventilation 2) is provided.
A more specific installation state of the communication device 20 will be described later.
[0022]
4 is an exploded perspective view of the communication device 20, FIG. 5 is a front view of the
communication device 20, FIG. 6 is a side view of the communication device 20, and FIG. 7 is an
A-A sectional view of FIG. FIG. 8 shows a B-B sectional view of FIG. 5, and FIG. 9 shows a C-C
sectional view of FIG. 5, respectively.
[0023]
The communication device 20 mainly includes a housing 30 forming a shell of the
communication device 20 (in the present embodiment, a box shape of 60 mm wide × 65 mm
03-05-2019
9
high × 30 mm deep), a speaker SP housed in the housing 30, and a microphone M , And an
audio processing unit 100.
[0024]
The housing 30 is composed of a front case 40 and a rear case 50.
The front case 40 is formed by molding an insulating synthetic resin material, and has a
rectangular front plate (front plate) 41 and a rectangular frame-shaped side wall raised rearward
from the peripheral edge of the front plate 41 (rear side). And 42.
The rear case 50 is formed by molding an insulating synthetic resin material, and has a
rectangular rear face plate (rear face plate) 51 and a rectangular frame-like side wall which is
raised from the periphery of the rear face plate 51 to the front (front side) And a part 52. Then, a
speaker SP, a microphone M, and a voice processing unit 100 are attached to the front case 40,
and a cable provided on the side wall 42 of the front case 40 with a connecting cable (not shown)
drawn from a printed circuit board 104 mounted with the voice processing unit 100 With the
rear case 50 joined and fixed to the front case 40 in the state of being pulled out from the pullout hole 43, that is, at the end of the assembly process of the communication device 20, the
housing 30 is assembled and the communication device 20 is assembled. It is assembled. The
front case 40 and the rear case 50 are fixed by fastening their four corners with four tapping
screws (not shown).
[0025]
Next, the speaker SP outputs the reception voice of the other party (operator of the emergency
notification center 5) from the front of the housing 30, and as shown in FIGS. 5 and 7, the front
of the housing 30, ie, It is attached to the inner side facing the circular sound emission hole 44
provided in the front plate 41 of the front case 40.
[0026]
As shown in FIG. 7, the speaker SP is a cylindrical frame 60 in which a cylindrical magnetic
circuit holding portion 60b having a diameter smaller than that of the vibration system holding
portion 60a is integrally formed at the rear end of the cylindrical vibration system holding
portion 60a. The dome-shaped diaphragm 61 with a diameter of 40 mm, whose outer peripheral
edge is fixed to the front end opening of the vibration system holder 60a, the cylindrical bobbin
03-05-2019
10
62 fixed to the rear surface of the diaphragm 61, and The voice coil 63 provided at the rear end
constitutes a vibration system that can vibrate in the front-rear direction, and this vibration
system and a magnetic circuit fitted and fixed to the magnetic circuit holding portion 60b.
[0027]
The magnetic circuit is mounted and fixed to a disk-shaped yoke 64, a cylindrical inner
permanent magnet 65 mounted and fixed to the central part of the yoke 64, and an outer part of
the yoke 64. An annular outer permanent magnet 66 disposed with a gap, a disk-shaped inner
pole piece 67 mounted on and fixed to the inner permanent magnet 65, and the outer permanent
magnet 66 are mounted and fixed, and the periphery of the inner pole piece 67 And an annular
outer pole piece 68 disposed with a predetermined gap in between, and it has an inner and outer
magnetic type in which a magnetic gap 69 is formed by the gap between the inner and outer
permanent magnets 65 and 66. 63 are inserted and arranged.
[0028]
Then, the front end of the vibration system holding portion 60a of the frame 60 is fitted inside
the plurality of arc-shaped ribs 45 for attaching the speaker SP provided so as to project from
the inner surface of the front plate 41 of the front case 40 around the sound output hole 44. The
speaker SP is attached to the front case 40 via the frame 60 with the front surface of the
diaphragm 61 facing the sound output hole 44 via the frame 60.
[0029]
Further, a pair of lead wires (not shown) derived from the voice coil 63 is connected to the
printed circuit board 104 on which the voice processing unit 100 described later is mounted, and
the voice processing unit 100 receives the reception voice signal to the voice coil 63 via the lead
wire. When input, an electromagnetic force is produced in the voice coil 63 by the current of the
received voice signal and the magnetic field of the inner and outer permanent magnets 65 and
66, so that the bobbin 62 is vibrated in the front-rear direction with the diaphragm 61.
At this time, the reception voice corresponding to the reception voice signal from the diaphragm
61 is radiated to the front of the housing 30 through the sound emission hole 44.
That is, a dynamic speaker SP is configured.
03-05-2019
11
[0030]
As described above, the electrodynamic speaker SP includes an inner and outer magnetic type
magnetic circuit as a magnetic circuit, and can easily obtain a high sound pressure level as
compared with the inner magnetic type or outer magnetic type magnetic circuit. It is suitable as a
speaker SP that outputs the reception voice of the other party (operator of the emergency call
center 5).
The magnetic circuit may be of an internal magnet type or an external magnet type.
[0031]
By the way, as shown in FIG. 5, when the speech apparatus 20 is viewed from the front, the
center SP of the diaphragm 61 which is the center of the speaker SP is positioned on the center
line CL in the width direction of the housing 30. Placed in position.
In addition, the sound output hole 44 is disposed concentrically with the diaphragm 61.
Furthermore, the line AA in FIG. 5 coincides with the center line CL.
[0032]
Next, the microphone M collects sound from the front of the housing 30, and as shown in FIGS. 5
and 7 to 9, the first, second, and third three non-directional microphones M1, M2. It consists of
M2 and M3. These first, second and third nondirectional microphones M1, M2 and M3
(hereinafter simply referred to as "microphone M1", "microphone M2" and "microphone M3"). )
Have the same configuration.
[0033]
FIG. 10 shows the configuration of the microphones M1, M2, and M3. The microphones M1, M2
and M3 are configured by back electret type microphones of diameter 4 mm and thickness 1.5
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12
mm. A ring 71 disposed on the printed circuit board 70 supports an electrode 72 made of brass,
and a brass ring 73 is provided between the electrode 72 and the printed circuit board 70.
Further, a vibrating membrane 74 made of Teflon (registered trademark) is disposed opposite to
the electrode 72, and the vibrating membrane 74 is supported by the brass ring 75. A spacer 76
is disposed in an air gap formed between the electrode 72 and the vibrating membrane 74. Then,
the case 77 on the printed circuit board 70 covers the above-described portions to form the
outer shell of the electret condenser microphone, and the amplified audio signal is output
through the junction FET 78 disposed on the printed circuit board 70.
[0034]
In such microphones M1, M2 and M3, the diaphragm 74 is disposed close to and in parallel with
the electrode 72, and the electrode 72 is configured of an electret film in which charges are
confined (that is, in a charged state) . Then, the acoustic signal from the outside vibrates the
diaphragm 74 in two directions (vertical directions in FIG. 10) orthogonal to the printed circuit
board 70, so that the distance between the diaphragm 74 and the electrode 72 fluctuates,
causing vibration. The capacitance between plate 74 and electrode 72 varies in response to the
acoustic signal. Therefore, when a DC voltage is applied between the diaphragm 74 and the
electrode 72 via a high resistance, an acoustic signal can be extracted as a fluctuation of the
voltage. The electrode 72 is formed of a plastic film to which a metal is attached by vapor
deposition or the like, or a metal thin film such as brass, and is injected by corona discharge or
the like to have a characteristic of semipermanently storing electric charge.
[0035]
As shown in FIG. 5 and FIG. 7 to FIG. 9 on the front surface of the housing 30 (the outer surface
of the front plate 41 of the front case 40), along with the sound output hole 44 of the speaker SP,
in the upper part of the sound output hole 44 A microphone housing recess 46 for housing the
microphones M1, M2 and M3, a microphone cover 80 covering the microphone housing recess
46, and first, second and third sound collecting holes 81a and 81b provided in the microphone
cover 80 , 81c (hereinafter simply referred to as “sound collecting hole 81 a”, “sound
collecting hole 81 b”, “sound collecting hole 81 c”. ) Are provided. The microphone cover 80
is formed by molding an insulating synthetic resin material.
[0036]
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13
The microphones M1, M2 and M3 are disposed at axially symmetrical positions with the center
line CL in the width direction of the housing 30 as an axis of symmetry in the microphone
housing recess 46, and the microphone M3 is It is disposed at a position on the symmetry axis
closer to the speaker SP than the microphones M1 and M2. Here, the center line CL in the width
direction of the housing 30 corresponds to one line segment extending in the radial direction
from the center O of the diaphragm 61 of the speaker SP.
[0037]
FIG. 11 is an exploded perspective view showing the storage structure of the microphones M1,
M2 and M3 with the front of the communication device 20 facing upward. FIG. 12 shows the
microphone cover 80 and the microphone holders 90a, 90b and 90c in a disassembled state. The
perspective view which looked at microphone M1, M2, M3 from the downward direction is
shown, respectively. FIG. 13 is a front view showing the storage structure of the microphones
M1, M2 and M3. (A) is a front view of the microphone storage recess 46 (front view of the
microphone cover 80) and (B) is a view of (A) (C) is a front view of the microphone storage recess
46 in a state in which the microphone cover 80 is transparent, and (C) is a view of the
microphone storage recess 46 in a state in which the microphone holders 90a, 90b and 90c and
the microphones M1, M2, and M3 are transparent. Front views are shown respectively.
[0038]
The microphone housing recess 46 is formed in a rectangular recess in which the microphone
cover 80 formed in a rectangular plate shape is inserted just above the sound output hole 44 in
the front of the housing 30, and the bottom surface of the rectangular recess The first, second,
and third three microphone housings 47a, 47b, and 47c (hereinafter simply referred to as
"microphone housing 47a", "microphones") which are circular concave portions for housing
individual microphones M1, M2, and M3. The storage unit 47b is referred to as the "microphone
storage unit 47c." , And a plurality of recesses 48 for inserting a plurality of screwing bosses 82
protruding from the inner surface of the microphone cover 80, and the microphones M1, M2,
and so on the bottoms of the microphone housings 47a, 47b and 47c. First, second, and third
three lead holes 49a and 49b for drawing lead wires (not shown) drawn from the printed circuit
board 70 of M3 into the inner surface of the housing 30 (inner surface of the front plate 41 of
the front case 40). 49c (hereinafter simply referred to as "lead holes 49a", "lead holes 49b", and
"lead holes 49c". Also, screw insertion holes 48a are provided in the bottom of the recess 48,
respectively.
03-05-2019
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[0039]
Here, in the microphones M1, M2 and M3, the diaphragm 74 of the microphones M1, M2 and
M3 vibrates in the same direction (back and forth direction) as the vibration direction of the
diaphragm 61 of the speaker SP, and the microphones M1, M2 and M3 are collected. The
microphones are stored in the microphone housings 47a, 47b, and 47c in a posture in which the
sound surface is provided in the same direction (forward) as the sound output direction from the
speaker SP.
[0040]
The microphones M1, M2 and M3 are stored in the microphone housings 47a, 47b and 47c of
the microphone housing recess 46 from the front side of the housing 30 (the front of the front
plate 41 of the front case 40). By inserting the microphone cover 80 into the microphone
housing recess 46 from the front side and fixing the microphone cover 80 to the housing 30, the
microphones M1, M2, M3 are held by the inner surface of the microphone cover 80 while the
microphones M1, M2, M3 are held. With the sound collecting holes 81a, 81b and 81c facing the
sound collecting surface, the microphone holding recess 46 holds the sound collecting holes 81a,
81b and 81c, and is arranged at the above position in the above posture.
The microphone cover 80 is fixed by screwing tapping screws (not shown) into the bosses 82 of
the microphone cover 80 from the rear of the front plate 41 of the front case 40 through the
screw insertion holes 48a.
[0041]
Further, the microphones M1, M2, M3 are housed in the microphone housings 47a, 47b, 47c
together with the microphones M1, M2, M3 in a state of being fitted to the outer circumferences
of the microphones M1, M2, M3. , 47b and 47c, and cylindrical first, second and third three
microphone holders 90a, 90b and 90c made of a rubber elastic material (elastomer) sandwiched
between The vibrations from the speaker SP transmitted to the microphones M1, M2, M3 can be
absorbed and reduced by the microphone holders 90a, 90b, 90c.
[0042]
03-05-2019
15
FIG. 14 is a view showing the inner surface of the housing 30, (A) shows a rear view of the front
case 40, and (B) shows a front view of the rear case 50. As shown in FIG.
Moreover, FIG. 15 shows DD sectional drawing of FIG.
[0043]
As shown in FIG. 14A and FIG. 15, reinforcing ribs 40 a of a honeycomb structure are provided
around the arc-shaped ribs 45 for speaker attachment on the inner surface of the front plate 41
of the front case 40, and the rear The reinforcing ribs 50a of a honeycomb structure are also
provided on the inner surface of the rear surface plate 51 of the case 50, and the rigidity of the
housing 30 is enhanced by the reinforcing ribs 40a and 50a, whereby the microphones M1, M2,
M3 via the housing 30 are provided. The vibration from the speaker SP transmitted to can be
reduced.
[0044]
FIG. 16 shows a circuit configuration diagram of the audio processing unit 100.
The voice processing unit 100 is configured by an IC including an amplification unit 101, a beam
former unit 102, and an echo cancellation unit 103, and the reception voice signal received by
the communication device 15 and input via the emergency notification ECU 11 is amplified by
the amplification unit 101. After being amplified, the signal is output from the speaker SP.
Further, each audio signal input from the microphones M1, M2 and M3 is subjected to signal
processing to be described later by the beam former unit 102 and the echo cancellation unit 103,
and then output to the communication device 15 via the emergency notification ECU 11 It is sent
to the reporting center 5.
[0045]
The beam former unit 102 is connected to the microphones M1 and M2, and delays the output of
one of the microphones M2 by a time corresponding to the distance X (43 mm in this
embodiment) between the centers of the sound collecting surfaces of the microphones M1 and
M2. A delay unit 102a, and an addition unit 102b for adding the output of the delay unit 102a to
the output of the other microphone M1, and as shown in FIG. 17, two directions perpendicular to
03-05-2019
16
the center line CL in the width direction of the housing 30. The directivity of (the left and right
direction of the arrangement direction of the microphones M1 and M2 in the width direction of
the housing 30) is strong, and the speakers in two directions (the height direction of the housing
30) along the center line CL of the width direction of the housing 30 The directivity in the
vertical direction of the arrangement direction between the SP and the microphone M forms a
weak bi-directionality 102c. The distance from the center O of the diaphragm 61 of the speaker
SP to the intersection point of the straight line connecting the centers of the sound collecting
surfaces of the microphones M1 and M2 with the center line CL in the width direction of the
housing 30 is 31.5 mm. is there.
[0046]
The echo cancellation unit 103 is connected to the microphone M3 and the addition unit 102b,
and outputs the outputs of the microphone M3 to the distances Y1 and Y2 between the center of
the sound collecting surface of the microphones M1 and M2 and the center O of the diaphragm
61 of the speaker SP. = Y2 = Y) Delay by a time according to the difference (Y-Y3) of the distance
Y3 (24 mm in this embodiment) between the center of the sound collecting surface of the
microphone M3 and the center O of the diaphragm 61 of the speaker SP An audio signal output
from the microphone M3 from an audio signal output from the beamformer unit 102. The delay
unit 103a includes an adder unit 103b that adds the output of the delay unit 103a to the output
of the adder unit 102b of the beamformer unit 102. Remove That is, the audio signal (residual
echo) from the speaker SP included in the output of the beam former 102 is removed.
[0047]
The voice processing unit 100 is mounted on the printed circuit board 104 and housed in the
housing 30. The printed circuit board 104 is attached to the front case 40, as shown in FIGS. 7-9,
and is housed in the gap between the rear end of the speaker SP and the rear face plate 51 of the
rear case 51 in the housing 30.
[0048]
Then, as shown in FIG. 3, in the overhead console 2 d disposed in the ceiling central portion 2 c
between the left and right sun visors 2 a and 2 b in the vehicle compartment, the communication
device 20 faces the front of the housing 30 (the front of the front case 40 The outer surface of
the face plate 41 faces downward and faces the sound collecting portion 2e directly below it, the
front and rear sides of the housing 30 face the front and rear direction of the vehicle 2, and the
03-05-2019
17
microphone M is positioned behind the speaker SP. A center line CL in the width direction of 30
extends in the front-rear direction of the vehicle 2.
[0049]
As described above, in the communication device 20 of the present embodiment, the housing 30
installed in the vehicle compartment, and the speaker SP housed in the housing 30 and
outputting the reception voice of the other party from the front of the housing 30; The
microphone M is housed in the housing 30 and includes a microphone M for collecting sound
from the front of the housing 30, and the microphone M is disposed at an axial symmetric
position with the center line CL in the width direction of the housing 30 as a symmetry axis. The
microphone M1, M2 and the microphone M3 disposed at a position on the center line CL closer
to the speaker SP than the microphones M1, M2 are connected to the microphones M1, M3 and
perpendicular to the center line CL It is connected to the beam former 102 forming the bidirectionality 102 c in which the directivity in two directions is strong and the directivity in two
directions along the center line CL is weak, and is connected to the beam former 102 and the
microphone M 3. Output from Further comprising an audio processing unit 100 provided with
an echo cancellation unit 103 to remove the audio signal outputted from the microphone M3
from the voice signal.
[0050]
The audio processing unit 100 is controlled by the beamformer unit 102 connected to the
microphones M1 and M2 so that the directivity in two directions perpendicular to the center line
CL is strong and the directivity in two directions along the center line CL is weak. Since the
directivity 102c is formed, ie, the directivity of the microphones M1 and M2 in the direction of
the speaker SP is weakened, it is possible to reduce the echo from the speaker SP to the
microphones M1 and M2.
Furthermore, since the audio processing unit 100 removes the audio signal output from the
microphone M3 from the audio signal output from the beam former unit 102 by the echo
cancellation unit 103 connected to the beam former unit 102 and the microphone M3, the
occupant can Only voiced speech can be extracted with high quality.
[0051]
Therefore, while reducing the influence of the speaker SP on the microphone M, it is possible to
realize the hands-free communication device for the emergency notification system of the
03-05-2019
18
speaker · microphone integrated type in which the speaker SP and the microphone M are housed
in the same housing 30.
[0052]
Further, in the case 30, the front of the case 30 faces downward, the microphone M is positioned
behind the speaker SP, and the center line CL is a vehicle in the central part 2 c between the left
and right sun visors 2 a and 2 b in the vehicle compartment. It is arrange | positioned in the state
extended in the front-back direction of two.
As a result, the directivity in the front and rear direction is weakened and the directivity in the
left and right direction is enhanced as viewed from the central part 2c between the left and right
sun visors 2a and 2b in the vehicle compartment. It can sound.
[0053]
Further, in the front of the housing 30, a sound output hole 44 provided at a position facing the
diaphragm 61 of the speaker SP, a microphone storage recess 46 for storing the microphone M,
and a microphone cover 80 covering the microphone storage recess 46. And sound collecting
holes 81a, 81b and 81c provided in the microphone cover 80.
As a result, the microphone M can be stored in the microphone storage recess 46 from the front
side of the housing 30, so the assembly is simplified.
[0054]
In the microphone housing recess 46, microphone housings 47a, 47b, 47c for separately housing
the microphones M1, M2, M3 are provided. Thus, the microphones M1, M2, and M3 can be
easily positioned.
[0055]
03-05-2019
19
The microphones M1, M2 and M3 are housed in the microphone housings 47a, 47b and 47c
together with the microphones M1, M2 and M3 in a state of being fitted on the outer
circumferences of the microphones M1, M2 and M3. There are provided microphone holders
90a, 90b, 90c made of a rubber elastic material sandwiched between the inner peripheral
surfaces of 47b, 47c. Thereby, the vibrations from the speaker SP transmitted to the
microphones M1, M2, M3 via the housing 30 can be reduced by the microphone holders 90a,
90b, 90c.
[0056]
Furthermore, other structures for reducing the vibration from the speaker SP transmitted to the
microphones M1, M2, and M3 through the housing 30 will be described below with reference to
the second to fourth embodiments.
[0057]
FIG. 18 is a front view of the communication device 200 according to the second embodiment,
and FIG. 19 is an exploded perspective view showing the storage structure of the microphones
M1, M2 and M3 with the front of the communication device 200 facing upward. 21 is a
perspective view of the microphone cover 280, the microphone holders 90a, 90b and 90c, the
microphones M1, M2 and M3, the mounting plate 203 and the cushion material 202 in a
disassembled state of FIG. It is an exploded front view showing the storage structure of M2 and
M3, (A) is a front view (front view of the microphone cover 280) of the microphone storage
recess 246, (B) makes the microphone cover 280 of (A) transparent. The front view of the
microphone storage recess 246 in the state, (C) is the front view of the microphone storage
recess 246 in the state in which the microphone holders 90a, 90b, 90c and the microphones M1,
M2 and M3 in (B) are made transparent. D) is a front view of the microphone housing recess 246
in a state in which the plate 203 and the cushion material 202 in (C) are made transparent, FIG.
22 is a cross-sectional view taken along the line A-A in FIG. -B sectional drawing, FIG. 24: CC
sectional drawing of FIG. 18 is shown, respectively.
The side view of the communication device 200 is the same as the side view shown in FIG. 6 of
the first embodiment. 25 is a cross-sectional view corresponding to FIG. 15 of the first
embodiment (a cross-sectional view taken along a line DD in FIG. 6).
[0058]
03-05-2019
20
A speaker-microphone-integrated hands-free communication device for an emergency
notification system (hereinafter referred to as a "communication device") in which the speaker SP
and the microphone M of the present embodiment are housed in the same housing 30. In 200),
the microphone cover 280 is formed in a rectangular shape slightly smaller than the opening
shape of the microphone storage recess 246 so as not to contact the housing 30 when fitted into
the microphone storage recess 246, and a gap 201 is provided around the periphery. . Then, the
microphones M1, M2 and M3 are attached to the microphone cover 280, and the microphone
cover 280 is fixed to the microphone housing recess 246 by the cushioning material 202 having
adhesiveness on both sides. Thereby, the cushion material 202 reduces the vibration from the
speaker SP transmitted to the microphones M1, M2, and M3 through the housing 30.
[0059]
Also, for attachment of the microphones M1, M2 and M3 to the microphone cover 280, a
mounting plate 203 is provided on the back side of the microphone cover 280 with a
predetermined interval and fixed in parallel, and between the microphone cover 280 and the
mounting plate 203 This is done by sandwiching the microphones M1, M2 and M3. The
mounting plate 203 is formed by molding an insulating synthetic resin material.
[0060]
On the inner surface of the microphone cover 280, the three first, second and third three sound
collecting holes 281a, 281b and 281c provided in the microphone cover 280 (hereinafter simply
referred to as "sound collecting hole 281a", "sound collecting hole 281b "," sound collecting hole
281c ". First, second and third cylindrical bosses 282a, 282b and 282c (hereinafter simply
referred to as "boss 282a", "boss 282b" and "boss"). Part 282c. The first, second, and third three
microphone housings 247a, 247b, and 247c, each of which has a circular recess, are provided on
the rear end surfaces of the bosses 282a, 282b, and 282c in the axial direction. (Hereinafter,
they are simply referred to as "the microphone storage portion 247a," "the microphone storage
portion 247b," and "the microphone storage portion 247c." ) Is provided. Also, on the inner
surface of the microphone cover 280, a plurality of positioning pins 204 and a plurality of bosses
205 for screwing are provided in a protruding manner.
[0061]
03-05-2019
21
On the other hand, on the front surface of the mounting plate 203 facing the inner surface of the
microphone cover 280, first, second and third three circular convex portions are provided at
three positions facing the microphone storage portions 247a, 247b and 247c. Microphone
holding portions 206a, 206b and 206c (hereinafter simply referred to as "microphone holding
portion 206a", "microphone holding portion 206b", and "microphone holding portion 206c"). ) Is
projected. Further, the mounting plate 203 is provided with a plurality of positioning holes 207
corresponding to the positioning pins 204 and a plurality of screw insertion holes 208
corresponding to the bosses 205 for screwing.
[0062]
Then, after the microphones M1, M2 and M3 are stored in the microphone housings 247a, 247b
and 247c of the microphone cover 280, the mounting plate 203 is fixed in parallel with a
predetermined interval on the back side of the microphone cover 280. The microphones M1, M2
and M3 are held by the end faces of the microphone holding portions 206a, 206b and 206c of
the mounting plate 203, and the sound collecting surfaces of the microphones M1, M2 and M3
are made to the sound collecting holes 281a, 281b and 281c of the microphone cover 280.
While facing each other, they are held by the microphone housings 247 a, 247 b and 247 c of
the microphone cover 280. Here, the microphones M1, M2 and M3 are accommodated in the
microphone accommodating portions 247a, 247b and 247c of the microphone cover 280 in a
state where the microphone holders 90a, 90b and 90c are fitted on the outer circumferences
thereof. Further, the fixing of the mounting plate 203 to the microphone cover 280 is carried out
from the rear side of the mounting plate 203 in the positioning state in which the positioning
pins 204 of the microphone cover 280 are fitted in the positioning holes 207 of the mounting
plate 203. A tapping screw (not shown) is screwed into each boss portion 205 of the microphone
cover 280 through 208.
[0063]
Also, after the microphones M1, M2 and M3 are attached to the microphone cover 280 as
described above, the microphone cover 280 is fitted into the microphone housing recess 246
from the front side of the housing 30 (the front of the front plate 41 of the front case 40). By
fixing the microphone cover 80 to the body 30, the microphones M1, M2 and M3 are stored and
arranged in the same position as in the first embodiment in the microphone storage recess 46 of
the housing 30.
03-05-2019
22
[0064]
When the microphone cover 280 is fitted into the microphone housing recess 246, the outer
edge of the inner surface of the microphone cover 280 is brought into contact with the three
positions of the upper center portion and the lower end portions of the peripheral wall portion of
the microphone housing recess 246, In a state where the outer surface of the microphone cover
280 is flush with the front of the housing 30, a constant-width cover abutment 209 for
supporting the microphone cover 280 at the opening of the microphone housing recess 246 is
provided, On the front end face of the cover contact portion 211, a cushioning material 202
which is in the form of a tape having a constant width and which is provided with adhesiveness
on both sides is attached.
The cushion material 202 is formed, for example, by sticking a double-sided pressure-sensitive
adhesive tape on both sides of a tape-like sponge substrate having a constant width or applying a
pressure-sensitive adhesive to form a pressure-sensitive adhesive layer.
[0065]
Then, after the microphones M1, M2 and M3 are attached to the microphone cover 280, when
the microphone cover 280 is fitted into the microphone housing recess 246 from the front side
of the housing 30, the outer edge of the inner surface of the microphone cover 280 is the
cushioning material 202 Because the microphone cover 280 is fixed to the microphone housing
recess 246 by the cushion material 202 and the microphone cover 280 is not in direct contact
with the housing 30, the microphone M1 through the housing 30 is fixed. , M2, and M3 reduce
the vibration from the speaker SP.
[0066]
Further, the mounting plate 203 is formed in the same rectangular shape as the microphone
cover 280 so as not to contact the housing 30 when fitted integrally with the microphone cover
280 in the microphone housing recess 246.
Furthermore, the outer edge of the microphone cover 280 is provided with a notch 210 for
preventing interference (contact) with the cover contact 209.
03-05-2019
23
[0067]
The first, second and second lead wires of the microphones M1, M2 and M3 are drawn to the
bottom of the housing recess 246 on the back side of the mounting plate 203 on the microphone
pressing portions 206a, 206b and 206c of the mounting plate 203. The three lead holes 211a,
211b and 211c (hereinafter simply referred to as "lead hole 211a", "lead hole 211b" and "lead
hole 210c"). And the lead wires of the microphones M1, M2 and M3 on the inner surface of the
housing 30 (opposite the lead holes 211a, 211b and 211c) on the bottom surface of the
microphone housing recess 246 facing the back surface of the mounting plate 203. First, second
and third three lead holes 249a, 249b and 249c for drawing in the inner surface of the front
plate 41 of the front case 40 are provided.
[0068]
As described above, in the communication device 200 of the present embodiment, the
microphone housings 247 a, 247 b and 247 c for storing the microphones M 1, M 2 and M 3
individually in the microphone cover 280 are projected from the inner surface of the microphone
cover 280. In order to fix the microphone cover 280 to the microphone housing recess 246, a
cushion material 202 having adhesiveness on both sides is provided, and a gap 201 is provided
between the microphone housing recess 246 and the microphone cover 280. Thereby, the
cushion material 202 can reduce the vibration from the speaker SP transmitted to the
microphones M1, M2, and M3 through the housing 30.
[0069]
FIG. 26 is a front view of the communication device 300 according to the third embodiment, and
FIG. 27 is an exploded perspective view showing the storage structure of the microphones M1,
M2 and M3 with the front of the communication device 300 facing upward. Is an exploded front
view showing the storage structure of the microphones M1, M2 and M3; (A) is a front view of the
microphone storage recess 346 (front view of the microphone cover 380); (B) is a microphone
cover of (A) (C) shows a front view of the microphone storage recess 346 in a state of making the
microphone front pressing sponge 303 transparent in (B), and (D) shows a front view of the
microphone storage recess 346 in a state of making the 380 transparent. C) is a front view of the
microphone housing recess 346 in a state where the microphone fixing sponge 301, the
microphones M1, M2 and M3 and the microphone back pressing sponge 302 are made
transparent, and FIG. , FIG. 30, B of FIG. The B sectional view, respectively, showing. The side
03-05-2019
24
view of the communication device 300 is the same as the side view shown in FIG. 6 of the first
embodiment. 31 is a cross-sectional view corresponding to FIG. 15 of the first embodiment (a
cross-sectional view taken along a line DD in FIG. 6).
[0070]
A speaker-microphone-integrated hands-free communication device for an emergency
notification system (hereinafter referred to as a "communication device") in which the speaker SP
and the microphone M of the present embodiment are housed in the same housing 30. In 300), a
block-like microphone fixing (positioning) sponge 301 which is a cushioning material that is
breathable and has substantially the same external shape as the microphone housing recess 346
and can be freely fitted to the microphone housing recess 346 The first, second, and third
circular through-holes are provided in the microphone fixing sponge 301, which have
substantially the same diameter as the microphones M1, M2, and M3 and can freely store the
microphones M1, M2, and M3 in a free state. The third three microphone storage units 347a,
347b and 347c (hereinafter simply referred to as "microphone storage unit 347a", "microphone
storage unit 347b", and "microphone storage unit 347c"). )). Thereby, the vibration from the
speaker SP transmitted to the microphones M1, M2, M3 through the housing 30 is reduced by
the microphone fixing sponge 301.
[0071]
The microphones M1, M2 and M3 have substantially the same diameter, and are stored before
the microphones M1, M2 and M3 in the microphone housings 347a, 347b and 347c in a free
state, and hold the back of the microphones M1, M2 and M3. Cylindrical microphone back
surface holding sponge 302 and microphone housing concave portion 346 are formed in
substantially the same external shape and are superimposed on the front surface of microphone
fixing sponge 301 to hold the sound collecting surface (front surface) of microphones M1, M2
and M3. A plate-like microphone front pressing sponge 303 is provided.
[0072]
Then, in order to store the microphones M1, M2 and M3 in the microphone housing recess 346,
the microphone fixing sponge 301 is inserted into the microphone housing recess 346 from the
front side of the housing 30 (the front of the front plate 41 of the front case 40) After the
microphone back pressing sponge 302 is inserted into the microphone housings 347a, 347b,
347c of the microphone fixing sponge 301, the microphones M1, M2, M3 are stored in the
03-05-2019
25
microphone housings 347a, 347b, 347c.
Then, after superposing the microphone front pressing sponge 303 on the front surface of the
microphone fixing sponge 301, the microphone cover 380 is inserted into the microphone
housing recess 346 from the front side of the housing 30, and the microphone cover 380 is fixed
to the housing 30. As a result, the microphones M1, M2, and M3 are stored and arranged in the
same position as in the first embodiment in the microphone storage recess 346 of the housing
30.
[0073]
When the microphone cover 380 is fitted to the microphone storage recess 346 from the front
side of the housing 30 on the peripheral wall portion of the microphone storage recess 346, the
outer edge of the inner surface of the microphone cover 380 is abutted. The cover contact
portion 304 for supporting the microphone cover 380 at the opening of the microphone housing
recess 346 is provided so that the outer surface of the microphone 30 is flush with the front of
the housing 30, and the microphone cover 380 is fixed It is performed by a double-sided
adhesive tape (not shown) attached to the front end face of the cover contact portion 301.
[0074]
Further, the microphone cover 380 is provided with a sound collecting hole 381 composed of a
large number of small holes in the portion excluding the outer edge.
[0075]
Further, on the bottom surface of the microphone housing recess 346, the lead wires of the
microphones M1, M2 and M3 are provided on the inner surface of the housing 30 (the inner
surface of the front plate 41 of the front case 40). First, second and third lead holes 349a, 349b
and 349c are provided.
[0076]
As described above, in the communication device 300 of the present embodiment, the
microphone fixing sponge 301 having air permeability capable of being fitted to the microphone
housing recess 346 is provided, and the microphones M1, M2, and M3 are separately provided
in the microphone fixing sponge 301. The microphone housings 347a, 347b, and 347c are
provided.
03-05-2019
26
Thereby, the vibration from the speaker SP transmitted to the microphones M1, M2, and M3
through the housing 30 can be reduced by the microphone fixing sponge 301.
[0077]
32 is a front view of the communication device 400 according to the fourth embodiment, and
FIG. 33 is an exploded perspective view showing the storage structure of the microphones M1,
M2 and M3 with the front of the communication device 400 facing upward. Is an exploded front
view showing the storage structure of the microphones M1, M2 and M3; (A) is a front view of the
microphone storage recess 446 (front view of the microphone cover 480); (B) is a microphone
cover of (A) (C) is a front view of the microphone storage recess 446 in a state in which the
microphones M1, M2 and M3 and the microphone holders 90a, 90b and 90c in (B) are
transparent. FIG. 35 shows an A-A sectional view of FIG. 32, FIG. 36 shows a B-B sectional view of
FIG. 32, and FIG. 37 shows a C-C sectional view of FIG.
The side view of the communication device 400 is substantially the same as the side view shown
in FIG. 6 of the first embodiment.
And FIG. 38 is a cross-sectional view corresponding to FIG. 15 (the D-D cross-sectional view of
FIG. 6) of the first embodiment.
[0078]
In the communication devices 20, 200, and 300 of the first to third embodiments, the
microphones M1, M2, and M3 are installed in such a state that the diaphragm 74 vibrates in the
same direction as the vibration direction (front and rear direction) of the diaphragm 61 of the
speaker SP. That is, the microphone housings 47a, 47b, 47c, 247a, 247b, 247c of the
microphone housing recesses 46, 246, 346 with the sound collecting surfaces (front side) of the
microphones M1, M2, M3 facing the front of the housing 30. , 347a, 347b, 347c, but the speaker
SP and the microphone M of this embodiment are housed in the same case 30. Device. ), The
microphones M1, M2 and M3 are installed in a state in which the diaphragm 74 vibrates in the
direction (horizontal direction and vertical direction) perpendicular to the vibration direction of
the diaphragm 61 of the speaker SP, ie, microphones M1 and M2 , And M3 with the side surface
03-05-2019
27
facing the front of the housing 30, stored and installed in the microphone storage recess 446.
Thereby, the influence on the microphones M1, M2, M3 due to the vibration from the speaker SP
transmitted to the microphones M1, M2, M3 through the housing 30 is reduced.
[0079]
The microphone housing recess 446 is formed in a rectangular recess in which a microphone
cover 480 formed in the shape of a rectangular plate is inserted just above the sound output hole
44 in the front of the housing 30, and the bottom of the rectangular recess is formed The first
and second concave portions (shape when the case 30 is viewed from the front), which
accommodates the individual microphones M1, M2 and M3 together with the microphone
holders 90a, 90b and 90c externally fitted thereto The third three microphone housings 447a,
447b, and 447c (hereinafter simply referred to as "microphone housing 447a", "microphone
housing 447b", and "microphone housing 447c". ), And first, second, and third three sound paths
including concave portions (shape when the case 30 is viewed from the front) formed on one
side surface of the microphone storage portions 447a, 447b, and 447c. 301a, 301b and 301c
are provided, and lead wires (not shown) derived from the printed circuit board 70 of the
microphones M1, M2 and M3 are provided on the bottom of the microphone housings 447a,
447b and 447c on the inner surface of the housing 30 First, second and third three lead holes
449a, 449b and 449c for drawing in the inner surface of the front plate 41 are provided. The
sound collecting holes 481a, 481b, 481c of the microphone cover 480 are provided at three
positions facing the sound paths 301a, 301b, 301c.
[0080]
Further, the microphone housings 447a and 447b for housing the microphones M1 and M2 for
beam forming are formed such that one side surfaces forming the sound paths 301a and 301b
face each other in the width direction (left and right direction) of the housing 30. The
microphones M1 and M2 are accommodated such that the sound collecting surfaces thereof face
each other in the width direction of the housing 30. On the other hand, the microphone storage
portion 447c for storing the microphone M3 for echo cancellation is formed such that one side
surface forming the sound path 301c faces the opposite side (upward) to the speaker SP, and the
microphone M3 is on the back side It is stored so as to face the speaker SP side (downward).
[0081]
03-05-2019
28
Then, the microphones M1, M2 and M3 together with the microphone holders 90a, 90b and 90c
fitted thereto are the microphone housing portion of the microphone housing recess 446 from
the front side of the housing 30 (the front of the front plate 41 of the front case 40). After
housing in 447a, 447b, 447c, the microphone cover 480 is inserted into the microphone housing
recess 446 from the front side of the housing 30, and the microphone cover 480 is fixed to the
housing 30, so that the microphones M1, M1 are formed With the sound collecting holes 81a,
81b and 81c facing the sound paths 301a, 301b and 301c while holding M2 and M3, they are
held by the microphone housing recess 446 and arranged at the same position as the first
embodiment. Fixing of the microphone cover 480 to the microphone housing recess 446 is
performed with a double-sided adhesive tape (not shown) on the inner surface of the microphone
cover 480.
[0082]
As described above, in the communication device 400 of this embodiment, the microphones M1,
M2 and M3 vibrate the diaphragm 74 in the direction (horizontal direction or vertical direction)
perpendicular to the vibration direction of the diaphragm 61 of the speaker SP. Install in state.
Thereby, the influence on the microphones M1, M2, M3 by the vibration from the speaker SP
transmitted to the microphones M1, M2, M3 through the housing 30 can be reduced.
[0083]
SP speakers M1, M2 and M3 microphones CL housing centerline O diaphragm center 1
emergency call system 2 vehicle 2a, 2b left and right sun visor 2c central ceiling 20 talker 30
housing 44 sound hole 46 microphone storage Recesses 47a, 47b, 47c Microphone storage unit
61 Diaphragm 80 Microphone cover 81a, 81b, 81c Sound collection holes 90a, 90b, 90c
Microphone holder 100 Voice processing unit 102 Beam former unit 103 Echo cancellation unit
03-05-2019
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