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DESCRIPTION JP2008207622

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DESCRIPTION JP2008207622
[PROBLEMS] To provide a voice information transmission device using an outer wall of a car as a
sound generator. An audio information transmission device according to the present invention
comprises an outer wall acoustically isolating an in-vehicle space from a space outside the
vehicle and including a locally vibratable portion, a structure inside the outer wall, and a stator.
An acoustic vibration assembly 1 comprising an actuator (ACT 1 to 3) including a vibrator, the
structure supporting the stator, and an outer wall in contact with the vibrator to form a locally
vibratable portion 1 , 2, 3 are included. Further, it includes an acoustic drive circuit 5 which
converts acoustic information in the vehicle interior space into an electrical signal, amplifies it,
and connects it to the actuator. [Selected figure] Figure 1
Voice information transmission device
[0001]
The present invention relates to a voice information transmission device that vibrates an outer
wall of a vehicle body from the inside of a vehicle or the like that is acoustically separated from
the outside space, for example, and transmits acoustic information to the outside space.
[0002]
As a voice information transmission device for transmitting acoustic information to the outside of
a vehicle, there has been known a conventional external transmission method for vehicles such
as special purpose vehicles.
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There are 140 types of "special purpose vehicles" defined in the law, such as emergency vehicles
such as police cars and fire engines, street cars, and camping cars. The sound transmission in
these cases has been made by using a large weatherproof speaker mounted outside the vehicle
body, or a small horn speaker having a sharp directivity so as to be suitable for tracking a
violating car of a police car or the like. On the other hand, there are also examples in which
speakers are installed in the engine room and under the bumper so as not to affect the
appearance of the car.
[0003]
In such an external transmission system, sound transmission is limited to one direction from
inside to outside and a specific direction. In addition, there are many things that affect the car
body structure, car body appearance and design, such as openings and screws, for mounting and
sound transmission, and mounting on general vehicles is not often performed. On the other hand,
in the example installed in the engine room or under the bumper, since it is difficult for the direct
sound to reach, the clearness of the voice is disturbed and there is a dislike that it is susceptible
to engine noise and heat. Furthermore, since outdoor weatherability is required, many are made
up of trumpet-shaped speakers, and although the sound volume is sufficient (rather than an
excessive sound volume and noise problems occur in the surroundings), the directivity is also
good. It was a very limited direction of speech, and there was little to be said for the purpose of
wide coverage near the vehicle body. From the above background, the direct sound area (near
sound field) with the window closed, which is effective for securing security, improving the
efficiency of the air conditioning in the car, or preventing falling when it rains, without giving
noise obstacles to the surroundings. It is desirable to have a hands-free system that can transmit
in-vehicle voice to the outside of the vehicle smoothly with high clarity and to communicate with
the outside of the vehicle.
[0004]
There is also a proposal to use another vibrator that does not use a trumpet-shaped speaker as
described above in the conventional device. The invention of the acoustic device described in
Patent Document 1 is a piezoelectric vibrator that vibrates the wall surface itself, and performs
acoustic output to the inside of a vehicle. However, no disclosure of conversational use is made.
The invention of the vehicle voice transmission device described in Patent Document 2 discloses
a proposal that enables conversation between the inside and the outside of the vehicle using a
speaker and a microphone provided on the side mirror. The invention of the automobile exterior
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component described in Patent Document 3 discloses a technology for generating a notification
sound from the right side molding when turning right and the left side molding when turning left
by the piezoelectric element provided on the back side of the side molding. ing. The present
invention does not use the outer plate of the vehicle as a diaphragm. The invention of the linear
vibration actuator described in Patent Document 4 shows a prior example of the actuator used in
the present invention. JP-A 2000-224680 JP-A 04-358936 JP-A 63-110047 JP-A 2003-199311
[0005]
The problems to be solved by the present invention are as follows. ア. In the case of fixedly
arranging a speaker (such as a trumpet shape) outside, the direction of sound transmission is
limited to one direction (inside car → outside side car), and the sound generation direction of the
speaker is limited to a specific angle range or excessive. The noise is scattered to the
surroundings by the volume. In addition, there is an adverse effect that the appearance is
impaired due to the attachment of the speaker, the safety as a projection to the outside of the
vehicle is reduced, and the structural strength is reduced due to the opening in the vehicle body.
Furthermore, when a speaker is used, it may be easily damaged or damaged during rainy
weather, and the use conditions may be limited. On the other hand, in the example where the
speaker is installed in the engine room etc., it is difficult for the direct sound to reach and there is
also the hating that the clarity is disturbed due to the influence of the engine noise, and the
application is limited in terms of audio information transmission outside the vehicle . Heat also
affects durability. イ. The inventions described in Patent Documents 1 to 3 described above can
not be used in applications where two-way conversation is performed while the window is closed,
in terms of natural communication with the surroundings of the car (the latest car outside).
[0006]
An object of the present invention is to provide a voice information transmission device in which
a vibratable portion is locally formed on the outer wall of a vehicle to transmit the acoustic
information of the space inside the vehicle to the outside of the vehicle. In addition, another
object of the present invention is to form a vibratable portion locally in the indoor partition wall
and to make acoustic information in one space close to the front surface of the excitation site in
another space (near field). The present invention is mainly directed to providing an audio
communication apparatus that directly transmits sound. Another object of the present invention
is to provide a voice information transmission device including an actuator which has been
improved as required for the voice information transmission device. Another object of the
present invention is to provide a novel voice information transmission apparatus using a plurality
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of sets of acoustic vibration assembly and acoustic drive circuit including the actuator. Another
object of the present invention is to provide means for acquiring an image of the periphery of the
vehicle in order to selectively operate the acoustic vibration assembly in relation to the external
environment when using a plurality of sets of acoustic vibration assemblies. Another object of the
present invention is to provide an audio communication device.
[0007]
In order to achieve the above object, the voice information transmitting apparatus according to
claim 1 according to the present invention comprises: an outer wall acoustically isolating an invehicle space from a space outside the vehicle and including a locally vibratable portion; And an
actuator including a stator and a vibrator, the structure supporting the stator, and an outer wall
which is in contact with the vibrator to form a local vibratable portion to transmit the sound out
of the vehicle. It is characterized in that it includes an acoustic vibration assembly, and acoustic
information in the in-vehicle space converted into an electric signal and amplified, and an
acoustic drive circuit connected to the actuator to transmit the acoustic information in the invehicle space to the outside of the vehicle. .
[0008]
According to a second aspect of the present invention, in the voice information transmission
apparatus according to the first aspect, at least one other acoustic vibration assembly is provided
at a position different from that of the acoustic vibration assembly, and each corresponds. An
acoustic drive circuit is provided, a set of two or more acoustic vibration assemblies and an
acoustic drive circuit is provided, and an arbitrary set is selected and operated from the set by
the selection means.
[0009]
An audio information transmission apparatus according to a third aspect of the present invention
is the audio information transmission apparatus according to the first or second aspect, wherein
a microphone is provided in the in-vehicle space, and the acoustic drive circuit amplifies the
microphone output. The present invention is characterized in that an outside-of-vehicle sound
introduction circuit is provided which reproduces the sound of the above-mentioned sound by
means of sound reproduction means in the vehicle.
According to a fourth aspect of the present invention, in the voice information transmission
device according to the third aspect, a howling prevention circuit is added to the acoustic drive
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circuit.
According to a fifth aspect of the present invention, there is provided the voice information
transmission device according to the second aspect, further comprising: imaging means for
imaging the outer periphery of the vehicle; Is provided with selection means for selecting.
[0010]
According to a sixth aspect of the present invention, there is provided the voice information
transmission device according to the first or second aspect, wherein the local vibratable portion
is formed on a front window. According to a seventh aspect of the present invention, in the voice
information transmission device according to the first or the second aspect, the local vibratable
portion is formed on the outer wall of the door, the outer wall in front of or behind the vehicle. It
is characterized by
[0011]
According to an eighth aspect of the present invention, there is provided an audio information
transmitting apparatus according to the eighth aspect of the present invention, comprising: an
outer wall acoustically isolating a first space and a second space, and an outer wall including a
locally vibratable portion; An acoustic transmission system comprising a body, an actuator
including a stator and a vibrator, the structure supporting the stator, and an outer wall that is in
contact with the vibrator to form a local vibratable portion, and transmits sound to a second
space. Acoustic vibration assembly, an acoustic signal in a first space is converted into an
electrical signal and amplified, and an acoustic drive circuit connected to the actuator, wherein
the acoustic information in the first space is transmitted to a second space It is characterized by
[0012]
An audio information transmission apparatus according to a ninth aspect of the present invention
is the audio information transmission apparatus according to the eighth aspect, wherein a
microphone is provided in the first space, and the microphone drive is amplified by the acoustic
drive circuit. A sound introducing circuit of the second space is provided for reproducing the
sound of the second space by the sound reproducing means in the first space.
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An audio information transmission apparatus according to a tenth aspect of the present invention
is the audio information transmission apparatus according to the ninth aspect, wherein a howling
prevention circuit is added to the acoustic drive circuit.
[0013]
The voice information transmission device according to claim 11 of the present invention is the
voice information transmission device according to claim 1, 2 or 8, wherein the actuator linearly
vibrates with respect to the stator having an electromagnetic solenoid. And a vibrator, wherein
the stator is fixed to the structure, and the vibrator is connected to an outer wall.
[0014]
The voice information transmitting apparatus according to claim 12 according to the present
invention is the voice information transmitting apparatus according to claim 11, wherein the
actuator further includes adjusting means for adjusting a fixed position of the stator with respect
to the structure, the vibration. The child is characterized in that it is adhesively fixed to the outer
wall without load when not driven.
The voice information transmission apparatus according to claim 13 of the present invention is
the voice information transmission apparatus according to claim 11, characterized in that an
increase weight is provided on a stator of the actuator.
[0015]
According to the above configuration, it is possible to realize the following voice transmission
from the inside of the vehicle to the outside of the vehicle, or the two-way voice transmission
between the inside and the outside of the vehicle on the premise of this with the window closed.
1. Since voice transmission to the outside of the vehicle or conversation with the outside of the
vehicle becomes possible while the window is closed, safety against crime during driving,
maintenance of the air conditioning effect in the vehicle, prevention of falling down when it rains,
etc. Ru. If a microphone is installed on the ceiling in the car, not only the driver but also the
passenger can participate in the conversation. 2. The combination of microphones and
actuators and the volume (system operating conditions) can be set automatically and optimally
according to the situation where the vehicle is placed. Therefore, voice transmission /
conversation can be performed completely hands-free without being aware of the operation and
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operation of the system. 3. Since the speaker attachment to the outside of the vehicle body is
not involved, the appearance is not impaired or the safety does not deteriorate due to the
projection, and the opening to the vehicle body is unnecessary, so the structural strength is not
reduced. 4. By combining with a separately prepared video and audio recording device, it can
be used as part of content production at the time of touring, and in a company car etc., troubles
and mistakes in transactions can be avoided without unreasonableness . 5. Since the actuator
body is made of metal and waterproof, there is no concern that the actuator body will be easily
damaged when it gets wet, or its operation will fail, and stable operation can always be achieved.
6. The aforementioned benefits can also be realized in applications other than vehicles. 7.
Since sound is generated by vibrating a limited flat portion of the vehicle body or a portion
according to this, efficient voice transmission limited to a target person in a very limited area
(near sound field) in front of that portion It is possible to service high clarity direct sound
without noise disturbance to the surroundings.
[0016]
Hereinafter, the best mode for carrying out the invention will be described with reference to the
drawings and the like. FIG. 1 is a plan view showing an embodiment of a voice information
transmission apparatus according to the present invention. The exterior wall of the vehicle
acoustically isolates the interior space from the space outside the vehicle, usually when the doors
and windows are closed. Elements that make up the outer wall include all exteriors, door skins,
body skins, front windows, door windows, floors, etc. In the embodiment shown in FIG. 1,
acoustic vibration assemblies including actuators ACT1 to ACT3 are arranged in relation to the
front door on the right side, the rear surface of the body, and the front window, respectively. The
acoustic vibration assembly is formed of an outer wall portion that is locally vibrated, an
actuator, and a structure that supports the stator of the actuator. The site vibrated locally has a
large sounding area compared to a speaker etc., so it exhibits sharp directivity effectively, and in
the vicinity of that site (near field), it is uniform over a relatively wide area parallel to the plane
While the sound pressure distribution can be obtained, it is characterized in that sound can be
transmitted without giving a noise disturbance to the surroundings in an extremely narrow angle
range for distant areas.
[0017]
FIG. 2 is an explanatory view showing an arrangement example of the in-vehicle microphone and
the acoustic vibration assembly of the voice information transmission device according to the
present invention. The in-car microphone is provided at the center of the steering wheel and at
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the inner wall of the door. These arrangements are intended for use in a hands-free manner. FIG.
2 shows an arrangement example of the ACT 1 of FIG.
[0018]
FIG. 3 is a perspective view showing a portion of a stator and a vibrator of an actuator of the
voice information transmitting apparatus according to the present invention, and FIG. 4 shows a
state where the actuator is attached to a door inner plate which is a structure using adjusting
means. Each of the actuators ACT1 to ACT3 is composed of a stator having an electromagnetic
solenoid that generates electromagnetic vibration and a vibrator that efficiently transmits the
vibration to a vehicle body outer plate or the like (locally vibratable part). The vibrator is linearly
reciprocated by supplying current (audio signal / AC) from an acoustic drive circuit to a coil
inside the stator. The current is obtained by converting audio information in the vehicle interior
space into an electric signal by a microphone or the like and amplifying it. The actuator includes
a stator having an electromagnetic solenoid, and a vibrator that linearly vibrates with respect to
the stator, the stator is fixed to a structure (in this example, the inner plate of the door), and the
vibrator is an outer wall It is connected to (the outside plate of the door). It is also possible to use
a small actuator using a giant magnetostrictive element, and it is conceivable to use a different
type of actuator depending on the driven object.
[0019]
As shown in FIG. 4, the actuator is further provided with adjusting means for adjusting the fixed
position of the stator and an increase weight. The adjustment position of the stator is adjusted by
this adjustment means, and the vibrator is fixed so as to contact the outer wall without load when
not driven. The adjusting means comprises a nut fixed to the inner plate of the vehicle body and
a bolt connected to the nut fixed to the stator. Furthermore, a weight is wound around the stator
in order to increase the inertia mass of the stator of the actuator and to increase the transmission
efficiency of the high frequency component vibration.
[0020]
The adjusting means and the stator are integrated in advance with an adhesive or the like. The
adjusting means consists of a nut and a bolt, and can adjust the overall length. After adjusting to
a size that fits freely in the space (no gap and no extra pressure) by this adjustment means, both
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ends are adhesively fixed to the outer plate and inner plate of the door, and further, bolts and
nuts are also adhesively fixed. Thus, the actuator can be fixed without any gap between the outer
wall (the outer plate of the door) and the structure (the inner plate of the door) by using the
adjusting means or the like, and without applying an extra force. If there is no inner plate or the
like which is a structure having an appropriate weight and strength for fixing the stator of the
actuator, an increase weight is attached to increase the mass of the stator. In addition, when the
rigidity and surface density of the inner plate are insufficient, it is reinforced with a lead plate to
increase the surface density. If the internal structure is fixed to the internal structure or the mass
of the internal structure is insufficient, the stator moves with the vibrator, the vibration is not
efficiently transmitted to the outer plate, etc., and the volume and the sound quality may be
degraded.
[0021]
When mounted on the driver's seat side door as shown in FIG. 2, the actuator needs to be
mounted near the lower end of the door to escape the descent of the window glass. The
attachment site of the transducer to the outer wall does not have to be at its center. If there are
reinforcements, etc., there is no big difference in the sound-production effect as long as it is
installed avoiding the vicinity of the vibration node. By the way, the sound producing effect itself
is enhanced when the outer plate as the sound producing body constitutes a convex with respect
to the sound producing direction (outside of the vehicle) like a door or a front window described
later. This can be realized by attaching the oscillator of the actuator to the protruding center of
the curved surface of the outer wall of the car.
[0022]
Moreover, in the example shown in FIG. 2, in order to avoid and remove resonance of the outer
wall (outer plate) and the inner plate, resonance and flicker of the inner plate, and sound
stagnation in the inner space surrounded by both, glass wool etc. Compress and fill, to control
the damping of both members and to absorb the sound in the internal space. For in-car
microphones, a directional or non-directional microphone should be installed on the steering
wheel or door (such as the lower end inside the window) to effectively pick up the in-car voice of
the driver etc. Is preferred. Also, a microphone provided for voice operation such as car
navigation may be used. It is thought that the sound emitted into the car from the outer and
inner plates is considerably reduced by the interior material of the door, and the possibility of
howling back to the microphone can be considerably reduced or avoided, but if necessary the
inner plate or In addition to increasing the surface density of door interior materials and
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reinforcing, the installation plate etc. are provided on the microphone side, and this is supported
by rubber etc. for anti-vibration. In this case, the microphone operates as a sound pressure type
microphone and picks up the sound of the entire 2π space equally. In addition to these, one or
more microphones may be installed on the ceiling of the vehicle.
[0023]
Acoustic vibration when an acoustic vibration assembly (actuator, structure supporting the stator
of the actuator, outer wall in contact with the vibrator of the actuator and locally forming the
vibratable portion) is disposed at the door as shown in FIG. The frequency characteristics of the
assembly are shown in FIG. A pure tone sweep signal is applied to the actuator via a power
amplifier (power amplifier) of the acoustic drive circuit, and measurement is performed using a
1/2 inch condenser microphone outside the vehicle at 30 cm from the door surface. It was
confirmed that sufficient sound quality and sound volume can be obtained by the abovedescribed sound absorption and damping, optimal adjustment of the adjustment means of the
actuator, and the like.
[0024]
In the embodiment shown in FIG. 1, the sound and vibration assembly (actuator, structure
supporting the stator of the actuator, outer wall in contact with the vibrator of the actuator to
form locally the vibratable portion), in addition to the door described above Although it is
disposed at the front window and the rear of the vehicle body, it can be installed on the outer
wall of the vehicle body such as a rear gate, a rear corner, a bonnet, etc. according to other
purposes.
[0025]
FIG. 6 shows an example of using a part of a front window which is an outer wall.
The dashboard and the angle fixed to it are used as a structure in the outer wall. Also in this
example, the mass of the stator of the actuator can be increased by an increase weight or the like,
and the adjustment means described above can be used to adjust the position of the stator.
[0026]
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With reference to FIG. 1, the general configuration and operation of an embodiment of a vehicle
application of the device according to the invention will be described. The outer wall acoustically
isolates the in-vehicle space from the space outside the vehicle and includes a locally vibratable
portion. In addition, FIG. 1 has shown the state which open | released the door which forms a
part of outer wall. Acoustic and vibration assemblies 1 to 3 (see FIGS. 2 and 4 and 6) are
provided, each including an outer wall, a structure, and actuators ACT1 to ACT3. The acoustic
drive circuit 5 (including the acoustic drive circuit 5 provided for each of the acoustic vibration
assemblies 1 to 3) includes the in-vehicle microphone 4 and converts the acoustic information in
the in-vehicle space into an electrical signal and amplifies it to connect to the actuators ACT1 to
ACT3. Good) is provided. In the example of FIG. 1, the actuator switching unit 6 switches and
connects the actuators ACT1 to ACT3. The actuator switching device 6 is connected with a
control signal corresponding to the driving condition from the vehicle speed / gear detector 9,
based on which the actuator to be driven is automatically selected or selected by the driver's
judgment. Ru. On the roof of the vehicle body, there are provided four external microphones 10
for collecting audio outside the vehicle, the outputs of which are amplified by the external
acoustic introduction circuit 7 and transmitted to the interior by the internal speaker 8. If four
microphones outside the vehicle are provided, it is possible to recognize the direction of arrival
of voice, but if there is no problem with the direction, one may be provided. In addition, existing
car stereo speakers can be used as in-car speakers.
[0027]
In the embodiment of the vehicle application shown in FIG. 7, the vehicle speed / gear detector 9
of the form shown in FIG. 1 is further subjected to other information outside the vehicle, such as
an input from a human sensor 11 (or video signal input terminal) described later. Also be
considered. Furthermore, an in-vehicle microphone echo canceller 5A is added to the abovedescribed acoustic drive circuit 5 in order to prevent howling more effectively.
[0028]
Hereinafter, operation modes corresponding to various situations will be described. The selection
of the operation mode (the selection of the acoustic vibration assembly corresponding to various
situations) can be automatically selected based on the judgment of the driver or based on the
acquired external information. 1. Refueling Mode First, when the car stops or reaches slow
speed at a gas station or the like, the human sensor (infrared active sensor) 11 operates to
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determine the presence or absence of a surrounding person (especially near the driver's seat). In
the automatic mode selection, when a person is detected in the vicinity, the system determines
that it is a "person in charge" or the like, a plurality of conditions (the vehicle position is at the
gas station according to the map information of the car navigation system) "Refueling mode" is
entered when the person near the driver's seat door is detected. At this time, the actuator (ACT 1)
is selected by the actuator switching device 6. The driver's voice is collected by the in-car
microphone 4 installed at the steering wheel of the driver's seat or at the lower end of the
window, etc., and is applied to the actuator (ACT1) through the microphone amplifier and
equalizer (EQ) of the acoustic drive circuit 5, etc. The sound is emitted from the outer plate of the
car outside the vehicle. When the clerk responds to this and emits a voice, the voice is collected
by the four outside microphones 10 installed on the roof of the vehicle body, emitted from the invehicle speaker 8 into the vehicle, and conversation in both directions is established. . At this
time, if there is another microphone in the vehicle such as a ceiling microphone, crew members
other than the driver can also participate in the conversation.
[0029]
2. In the case of receiving guidance for reverse movement by the induction person, the
actuator ACT2 of the acoustic vibration assembly 2 disposed at the rear of the vehicle body is
operated. As a result, the in-vehicle intention is transmitted to the inducer, and the voice of the
inducer can be acquired via the microphone 10 outside the vehicle. In the automatic mode
selection, the gear may be configured to enter the "induction mode" from the condition that the
person is detected at the "backward" position and at the rear of the vehicle body. 3. Forward
warning mode In the situation where a person is intruding in the forward direction, it is
necessary to transmit a message that it is dangerous. In such a case, an acoustic vibration
assembly disposed in front of the vehicle body (front window) The actuator ACT3 of 3 is
operated. Thus, the intention of the driver or the like in the vehicle is transmitted to the intruder,
and if there is an indication of the intention of the intruder, the intention is transmitted to the
inside of the vehicle via the outside microphone 10. In automatic mode selection, the gear detects
a moving object (person / animal) of a specific size on the forward path with a position of
"forward", and the vehicle and moving object contact based on the moving direction and speed of
the vehicle and moving object. It is also possible to enter the "alarm mode" on the condition that
it is determined that there is a possibility or that the vehicle's horn is operated. 4. Rear
Warning Mode When the vehicle is parked, a situation in which a person is approaching behind,
leaving the vehicle in reverse as it is, it is regarded as a problem that the person is pulled. As
described above, when the vehicle is stopped, the gear is switched to the "backward" position,
and a person is detected at the rear of the vehicle body, an alarm is issued to the driver and the
acoustic vibration assembly 2 disposed at the rear of the vehicle The actuator ACT2 is operated.
As a result, the intention of the driver in the vehicle and the like is transmitted to the intruder,
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and if there is an indication of the intention of the intruder, it can be acquired via the microphone
10 outside the vehicle. At this time, it is also possible to simultaneously acquire video from a
camera attached to the rear so that communication by video and audio can be performed.
[0030]
Next, prevention of howling expected by bidirectional transmission will be described. As
described above, when bi-directional transmission is planned, depending on the volume (sound
level), the sound is returned to the in-vehicle microphone from the outer plate / inner plate
excited by the actuator or from the in-vehicle speaker or the like to generate howling There is a
risk of An echo canceller 5A is provided in the acoustic drive circuit 5 of FIG. 7 to collectively
cancel the feedback sound from all the paths. The identification is performed by disconnecting
between the equalizer (EQ) of the acoustic drive circuit 5 and the feedback node of the echo
canceller 5A in the operating state, flowing pink noise from here and circulating around the
circuit, and the output signal appearing at the other end is zero. Alternatively, the parameters of
the echo canceller 5A are adjusted to be minimized. If the volume may be small, or if simple
instructions or requests in one direction are acceptable, the possibility of howling occurring is
small, so it is not necessary to use an echo canceller in combination.
[0031]
The voice information transmission device according to the present invention can be introduced
by using existing equipment such as a car stereo, or by slightly modifying the existing equipment,
even if it is not originally equipped in a vehicle. Therefore, it can be used widely in related
industries as well as in the automobile manufacturing industry. Since it is possible to interact
with the outside without opening the door of the vehicle, it can contribute to ensuring the safety
of the passenger. It can also be used to solve similar problems in two spaces in a house.
[0032]
FIG. 1 is a plan view showing an embodiment of a voice information transmission device
according to the present invention. It is explanatory drawing which shows the example of
arrangement | positioning of the in-vehicle microphone and acoustic vibration assembly of the
audio | voice information transmission apparatus by this invention. It is a perspective view which
shows the stator and vibrator part of the actuator of the audio | voice information transmission
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apparatus by this invention. It is explanatory drawing which shows the state which attached the
actuator of the audio | voice information transmission apparatus by this invention to the door
inner plate which is a structure using an adjustment means. It is a graph which shows the
frequency characteristic of acoustic vibration assembly at the time of arranging acoustic
vibration assembly of a voice information transmission device by the present invention to a door.
It is an explanatory view showing an example which arranged acoustic vibration assembly of a
voice information transmission device by the present invention in a front window. FIG. 6 is a
schematic view for explaining an embodiment in which external information can be taken in and
howling is prevented in the voice communication device according to the present invention.
Explanation of sign
[0033]
1, 2, 3 Acoustic vibration assembly ACT 1, 2, 3 Actuator 4 In-car microphone 5 Acoustic drive
circuit 5A Echo canceler 6 Actuator switching device 7 In-car acoustic introduction circuit 8 Incar speaker 9 Speed / gear detector 9A Speed / gear / human detector 10 Microphone outside
the car 11 Human sensor (or video signal input terminal)
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