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JP2007158958

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DESCRIPTION JP2007158958
The present invention provides a voice input / output device capable of freehand conversation
with a partner without using a plurality of speaker units and without leakage of sound emitted
from the speaker unit to the surroundings. A voice input / output device (101) includes movable
mechanisms (109A to 109D) for changing the curvature of a sound emitting surface (102A) of a
capacitor speaker (102). The direction of the sound emitting surface 102A of the condenser
speaker 102 and the curvature of the sound emitting surface 102A are changed so that the focus
is on the position of the speaker W. When the condenser speaker 102 is set to a concave curved
surface, since the sound can be concentrated to one point (focus), the sound can reach only a
narrow range and the sound is diffused and attenuated behind the focus. You can talk in
freehand without sound leakage. [Selected figure] Figure 12
Voice input / output device
[0001]
The present invention relates to a voice input / output device capable of freehand conversation
by connecting to a communication device such as a telephone.
[0002]
By connecting a headset in which a speaker and a microphone are integrated to a communication
device such as a telephone and wearing the headset, the user can talk with the other party
without having a receiver (see Patent Document 1). ).
[0003]
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1
Also, by connecting the handsfree device to a communication device such as a telephone and
using the handsfree device, the user can talk with the other party without wearing the device (see
Patent Document 2).
[0004]
Furthermore, conventionally, the invention relates to a directivity controllable speaker system
that measures the position of the listener with a plurality of microphones and adjusts the
directivity of the speakers of two channels configured by a plurality of speaker arrays ( See, for
example, Patent Document 3).
JP, 2005-167360, A JP, 2002-118, 878, JP, 2005-192212, A
[0005]
However, since the headset described in Patent Document 1 is heavy to some extent, and the ear
rest portion is always used against the ear, the user wears the headset and feels a sense of weight
and pressure, so it can be used for a long time There was a problem that I could not do it.
[0006]
In addition, the handsfree device described in Patent Document 2 usually uses one nondirectional
microphone and one nondirectional speaker.
Therefore, since voices (noises) emitted from persons other than the speaker are also picked up,
there is a problem that the quality of the picked-up voice is low and it is difficult for the other
party to hear the voice.
[0007]
Furthermore, since the directivity controllable speaker system described in Patent Document 3
controls directivity by a speaker array composed of a plurality of speakers, it is necessary to
adjust the output timing of gain and sound for each speaker.
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Therefore, when used as a voice input / output device for telephones, the scale of the device
becomes quite large, and there is a problem that it is difficult to handle.
In addition, the speaker array requires many speaker units to control directivity, and also
requires a circuit for adjusting the output timing of gain and sound for each speaker unit,
resulting in a complicated configuration and high cost. There was a problem that.
[0008]
Therefore, the present invention has a simple configuration without using a plurality of speaker
units, and an audio input / output device capable of freehanded conversation with the other
person without leaking the sound emitted from the speaker units to the surroundings. Intended
to provide.
[0009]
The present invention has the following configuration as means for solving the above-mentioned
problems.
[0010]
(1) A flat speaker unit having a convex curved surface, a concave curved surface, or a flat sound
emitting surface and emitting a voice according to an input voice signal; and a plurality of
microphones installed at different positions. A direction changing unit configured to change a
direction of a sound emitting surface of the flat panel speaker unit; estimating a position of a
sound source based on a sound collected by each of the plurality of microphones; Sound source
position estimation means for controlling the direction changing means so as to change the
direction of the surface to the direction of the sound source.
[0011]
In this configuration, the voice input / output device picks up the voice emitted from the sound
source with a plurality of microphones, estimates the position of the voice source based on the
picked up voice, and flat-plates the speaker unit in the direction of the voice source Change the
direction of the flat panel speaker unit so that the sound emitting surface of the panel faces.
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In addition, the sound emitting surface of the flat panel speaker unit is a convex curved surface, a
concave curved surface, or a flat surface, and when the flat panel speaker unit is a convex curved
surface, the sound is diffused to propagate the sound in a wide range. Can speak to multiple
people.
Also, when the flat speaker unit has a concave surface, the sound can be concentrated on the
focal point, and the sound can reach only a narrow range, and the sound is diffused and
attenuated behind the focus, so the sound to the surroundings It can be made less likely to leak.
In addition, when the flat panel speaker unit is flat, it is possible to generate a sound field in
which the sound can travel far to a long distance with strong straightness and little attenuation.
Therefore, when making the sound emission surface of the flat panel speaker unit into a flat
surface, the focus position is not set, and when the sound emission surface of the flat panel
speaker unit is with a concave surface, the flat panel speaker unit By setting in advance the focal
point of the sound emitted from the speaker at the position of the speaker, when the speaker
who is the sound source emits a voice, the direction of the speaker is automatically estimated,
and the flat panel speaker unit Since the sound emission surface of the speaker is changed to the
direction of the speaker, the speaker unit can emit the voice to the speaker without any sound
leakage around, and the speaker is freehand using the voice input / output device. You can talk
with the other person. In addition, in the case where the sound emission surface of the flat panel
speaker unit is a convex curved surface, when the speaker who is the sound source makes a
voice, the direction of the speaker is automatically estimated and the sound emission of the flat
panel speaker unit is generated. Since the face is changed to the direction of the speaker, voice
can be emitted from the speaker unit to a plurality of persons around the speaker, and the
plurality of speakers can use the voice input / output device to freehand the other party. I can
talk with you. Furthermore, the voice input / output device that can be used freehand can be
configured simply without using a plurality of speaker units.
[0012]
(2) A flat panel type speaker unit having a flexible panel-like sound emitting surface and emitting
sound according to the input audio signal; and Changing the curvature of the sound emitting
surface of the flat panel speaker unit Curvature changing means, a plurality of microphones
respectively installed at different positions, a direction changing means for changing the
direction of the sound emitting surface of the speaker device, and a position of a sound source
from the sound collected by each of the plurality of microphones And changing the direction of
the sound emitting surface of the flat speaker unit to the direction of the sound source, and
changing the curvature of the flat speaker unit to emit the estimated position of the sound source
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from the flat speaker unit Sound source position estimating means for controlling the direction
changing means so as to set the focal point position of the voice.
[0013]
In this configuration, the voice input / output device picks up the voice with a plurality of
microphones, estimates the position of the sound source based on the picked-up voice, and
focuses on the position of the sound source. Change the direction and curvature of the sound
emission surface.
Therefore, since the voice input / output device automatically detects the direction of the speaker
and changes the direction and curvature of the flat panel speaker unit, the speaker can be
freehanded from the speaker to the periphery without wearing the device. You can talk with the
other person without causing sound leakage. In addition, since the curvature of the condenser
speaker is changed to change the focal position, the configuration can be simplified without
using a plurality of speaker units.
[0014]
(3) The sound source position estimation means controls the deformation mechanism to control
the deformation mechanism according to the setting received by the operation means. The
curvature of the speaker unit is changed.
[0015]
In this configuration, when the shape of the flat speaker unit is set to any of concave, flat, or
convex curved by the operation unit, the control unit controls the deformation mechanism to set
the flat speaker unit. Transform it into the shape you
Therefore, the range in which the sound is emitted can be switched according to the usage
condition of the speaker device and the surrounding condition.
[0016]
(4) The flat-plate speaker unit is a flat-plate capacitor speaker including a flexible electrode and a
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diaphragm.
[0017]
In this configuration, the speaker unit is set because it is a flat capacitor speaker having a
configuration in which a flexible electrode and a diaphragm are opposed to each other unlike a
structure including a voice coil like a dynamic speaker. It becomes possible to freely deform the
speaker unit according to the shape.
[0018]
According to the present invention, the voice input / output device picks up the sound emitted
from the sound source by the plurality of microphones, estimates the position of the sound
source, and the sound emission surface of the flat speaker unit faces in the direction of the sound
source. As described above, the orientation of the flat panel speaker unit is changed.
In addition, the sound emitting surface of the flat panel speaker unit is a convex curved surface, a
concave curved surface, or a flat surface, and when the flat flat speaker unit is a convex curved
surface, the sound is diffused to propagate the sound in a wide range. You can let the people hear
the voice to multiple people.
In addition, when the flat panel speaker unit is flat, it is possible to generate a sound field in
which the sound can travel far to a long distance with strong straightness and little attenuation.
In addition, when the flat panel speaker unit has a concave curved surface, the sound can be
concentrated at one point (focus), so the sound can reach only a narrow range, and the sound is
diffused behind the focus and the sound pressure Because it also attenuates, sound leakage can
be made less likely to occur. Therefore, when the speaker who is the sound source makes a voice,
the direction of the speaker is automatically estimated, and the direction of the sound emission
surface of the flat panel speaker unit is changed to the direction of the speaker. The speaker unit
can emit the voice to the speaker without occurrence.
[0019]
Further, since the voice input / output device can change the curvature of the sound emission
surface of the flat panel speaker unit, it can change the focal position of the sound emitted from
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the speaker to focus the position of the sound source. . Furthermore, since the sound input /
output device can deform the sound emitting surface of the flat panel speaker unit into a convex
curved shape according to the input from the operation means, the sound is diffused to the
surroundings, and the contents spoken by the other party are It can be told to several people at
the same time.
[0020]
Further, according to the audio input / output device of the present invention, since the range in
which sound is emitted can be controlled using one speaker unit, the configuration of the audio
input / output device is not complicated, and the cost can be suppressed. In addition, it is difficult
to cause a phase shift, and accurate control of the sound emission direction becomes possible.
[0021]
First Embodiment First, the overall configuration of a voice input / output device will be
described.
FIG. 1 is a perspective view showing a schematic configuration of a voice input / output device.
[0022]
As shown in FIG. 1, the audio input / output device 1 is a flat panel speaker unit including a
capacitor speaker 2, a support 3, a rotary table 4, a rotation mechanism 5, and five fixed arms
6A, 6B, 6C, 6D, 6E, And eight microphones 7A, 7B, 7C, 7D, 7E, 7F, 7G, 7H.
[0023]
The condenser speaker 2 emits an audio according to an audio signal input from the outside.
Moreover, the capacitor | condenser speaker 2 is flat rectangular shape, and the shape of the
sound emission surface is formed in concave curve shape or planar shape. The detailed structure
of the capacitor speaker 2 will be described later.
04-05-2019
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[0024]
The support 3 is supported such that the sound emitting surface 2A of the condenser speaker 2
is substantially perpendicular to the rotating table 4. Fixed arms 6A to 6D are fixed to the
respective end portions of the wall surface 3A of the support 3. In addition, a fixed arm 6E is
fixed to a central portion of the support 3. Further, on the upper surface 3B of the support 3, the
microphones 7A to 7H are arranged in a T-shape.
[0025]
The rotating table 4 makes the column 3 to which the condenser speaker 2 is connected stand
upright.
[0026]
The rotation mechanism 5 rotates the shaft 3E (not shown) of the column 3 by the built-in
rotation table motor 5A and the gear 5B (both not shown) to change the direction of the sound
emitting surface 2A of the condenser speaker 2.
[0027]
The fixed arms 6A to 6E are for fixing the capacitor speaker 2 to the wall surface 3A of the
column 3, one end of which is fixed to the central portion or each end of the capacitor speaker 2,
and the other end is the wall surface 3A of the column 3 Fixed at the center or at each end of the
[0028]
The microphones 7A to 7H are non-directional microphones mounted at different positions on
the upper surface of the support 3 and collecting surrounding sound.
The microphones 7A to 7H are arranged in a T shape on the upper surface 3B of the support 3
as described above.
[0029]
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8
Next, the system configuration of the voice input / output device will be described.
FIG. 2 is a block diagram of the voice input / output device.
The voice input / output device 1 includes a condenser speaker 2, microphones 7 A to 7 H, an
arithmetic unit 41, a turntable motor 5 A, an output terminal 48, and an input terminal 49. In
addition, the arithmetic unit 41 includes an A / D conversion circuit 42, an adder 43, a sound
source position estimation circuit 44, a motor control circuit 45, an input speech enhancement
circuit 46, and a wraparound sound estimation circuit 47.
[0030]
The microphones 7A to 7H pick up the speaker (sound source) W and surrounding voices, and
output analog voice signals to the A / D conversion circuit 42 of the arithmetic unit 41.
[0031]
The A / D conversion circuit 42 converts analog voice signals sent from the microphones 7A to
7H into digital voice signals.
Then, the A / D conversion circuit 42 outputs the audio signal collected by each of the
microphones 7A to 7H to the adder 43.
[0032]
The adder 43 matches and adds the phases of the audio signals collected by the microphones 7A
to 7H. Further, the adder 43 subtracts the audio signal output from the looped sound estimation
circuit 47 from the signal obtained by adding the phases in phase. Then, the adder 43 outputs
this audio signal to the input audio emphasizing circuit 46.
[0033]
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The sound source position estimation circuit 44 estimates the position of the sound source based
on the audio signals output from the microphones 7A to 7H. Then, the sound source position
estimation circuit 44 outputs the sound source position information to the motor control circuit
45 and the input voice emphasizing circuit 46.
[0034]
The motor control circuit 45 outputs a signal for rotating the turntable motor 5A based on the
sound source position information sent from the sound source position estimation circuit 44, and
the direction of the sound emitting surface 2A of the condenser speaker 2 is the direction of the
sound source. Change to
[0035]
The turntable motor 5A rotates the support 3 in accordance with the signal sent from the motor
control circuit 45, and changes the direction of the sound emitting surface 2A of the condenser
speaker 2.
[0036]
The input speech emphasizing circuit 46 extracts only the speech of the speaker (sound source)
W from the speech signal output from the adder 43 based on the signal sent from the sound
source position estimating circuit 44, and outputs the output terminal 48. Output to
[0037]
The wrap around sound estimation circuit 47 estimates the signal amount of the sound emitted
from the capacitor speaker 2 and coming around the microphones 7A to 7H based on the audio
signal input through the input terminal 49, and estimates the estimated audio signal. It outputs
to the adder 43.
[0038]
The output terminal 48 and the input terminal 49 are terminals for inputting and outputting
audio signals, and are connected to, for example, an audio input / output terminal of a telephone
which is a communication device.
[0039]
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The capacitor speaker 2 converts an audio signal input from the input terminal 49 into audio and
emits the audio.
The capacitor speaker 2 is configured to include an amplifier 21 and a bias power supply 22
described later.
[0040]
With the above configuration, the voice input / output device 1 estimates the position of the
speaker (sound source) W by the plurality of microphones 7A to 7H, rotates the support 3 by the
rotation mechanism 5, and emits the sound of the condenser speaker 2. The direction of face 2A
is changed to the direction of speaker W.
[0041]
Next, the detailed configuration of the condenser speaker 2 will be described.
FIG. 3 is a schematic block diagram of a condenser speaker.
As shown in FIG. 3A, the capacitor speaker 2 is air-permeable between the flat plate-shaped
rectangular fixed electrodes (positive electrode, negative electrode) 12 and 13 processed by
meshing via the insulators 15 and 16. The flat movable diaphragm 14 made of a conductive thin
film is disposed opposite to the fixed electrodes 12 and 13.
[0042]
The fixed electrodes 12 and 13 of the capacitor speaker 2 are made of a flexible material such as
polyethylene terephthalate (PET).
Further, the thickness of the capacitor speaker 2 is, for example, about 5 mm.
The capacitor speaker 2 is normally flat, but can be deformed into a concave surface or a convex
04-05-2019
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surface when an external force is applied.
Further, between the fixed electrodes 12 and 13 and the movable diaphragm 14, as will be
described later, even when the condenser speaker 2 is deformed by the fixed arms 6A to 6E, the
movable diaphragm 14 vibrates without any problem. It is set.
[0043]
As shown in FIG. 3B, in order to operate the capacitor speaker 2 as a speaker, an amplifier
(power amplifier) 21 and a bias power supply 22 are connected to the capacitor speaker 2. That
is, the audio signal input from the input terminal 20 is amplified by the voltage amplifier 21P, a
voltage corresponding to this signal is applied to the fixed electrode 13 on the front side of the
capacitor speaker 2, and the phase is inverted by the inversion voltage amplifier 21N. Is inverted
and amplified, and a voltage corresponding to this signal is applied to the fixed electrode 12 on
the rear surface side of the capacitor speaker 2. The movable diaphragm 14 is applied with a bias
voltage from the bias power supply 22 and vibrates due to the attractive force / repulsive force
generated according to the potential difference between the fixed electrodes 12 and 13 to
generate air vibration that becomes a voice wave. .
[0044]
FIG. 4 is a top view of the audio input / output device and a sound emission area when the sound
emission surface 2A of the capacitor speaker is set to a concave surface shape and a planar
shape.
[0045]
As shown in FIG. 4A, when the length of each of the fixed arms 6A to 6E is adjusted to set the
capacitor speaker 2 in a concave curve shape (cylindrical shape), the sound waves emitted from
the capacitor speaker 2 are cylindrical One line that is the center of (referred to as the focal
point.
Concentrate on Therefore, as shown in FIG. 4B, the area near the focal point of the condenser
speaker 2 is the area with the highest sound pressure. Further, when the length of each of the
fixed arms 6A to 6E is adjusted to set the condenser speaker 2 in a spherical shape, the sound
04-05-2019
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emitted from the condenser speaker 2 is concentrated at one point (focus). Therefore, it is
possible to propagate the sound only in a narrow range and to attenuate the sound in the rear or
in the distance because the sound is diffused, thereby forming a sound field in which sound
leakage is less likely to occur.
[0046]
Further, as shown in FIG. 4C, when the length of each of the fixed arms 6A to 6E is adjusted to
set the capacitor speaker 2 in a planar shape, as shown in FIG. 4D, from the capacitor speaker 2
The emitted sound waves become more straightforward. Therefore, it is possible to form a sound
field in which sound propagates to a distant place with little attenuation.
[0047]
Furthermore, as shown in FIG. 4E, when the length of each of the fixed arms 6A to 6E is adjusted
to set the capacitor speaker 2 in a convex curved shape, as shown in FIG. The sound waves
emitted from are diffused. Therefore, sound can be propagated to a wide range, and voice can be
heard by a plurality of people.
[0048]
Next, a sound source estimation operation by a plurality of microphones will be described. FIG. 5
is a diagram showing the arrangement of microphones and a sound collection area. As described
above, the voice input / output device 1 of the present invention picks up voices by a plurality of
microphones, specifies the position of the sound source using the voices picked up by the
microphones, Change the direction of the sound emission surface 2A. Further, only the voice of
the speaker (sound source) W is extracted from the collected voice.
[0049]
The voice input / output device 1 performs sound source position estimation by the sound
source position estimation circuit 44 in the following procedure.
[0050]
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13
1.
First, the mixed signal of the input sound collected by the microphone and the non-target sound
is separated, and the obtained signal is y (t). As a sound source separation method, when a
plurality of microphones are used, a method such as blind sound source separation by
independent component analysis can be applied.
[0051]
2. As shown in FIG. 5, a plurality of points in the sound source search space 51 are prepared
as sound collection focal points, and the sounds of the respective sound collection focal points pn
are prepared.
[0052]
[0053]
(Lkn is the distance from the microphone k to the sound collection focal point pn, V is the speed
of sound), and the same phase and level are obtained, and a signal obtained by adding is yn (t).
[0054]
3.
And the correlation between y (t) and yn (t)
[0055]
[0056]
Is calculated to estimate the sound collection focal point pn at which the correlation value is
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highest as the sound source position (the position of the speaker W), the sound source position
information is transmitted to the motor control circuit, and the motor of the rotation mechanism
5 is driven. Then, the direction of the sound emitting surface 2A of the condenser speaker 2 is
aligned with the direction of the position of the speaker W.
[0057]
Further, the input speech emphasizing circuit 46 outputs the separated signal y (t) obtained by
the above sound source separation method.
[0058]
According to the above procedure, the voice input / output device 1 can pick up only the voice of
the speaker W and emit the voice in the direction of the speaker W.
[0059]
Next, an operation in which the voice input / output device estimates the position of the sound
source and changes the direction of the capacitor speaker will be described based on a flowchart.
FIG. 6 is a flowchart for explaining the operation of the voice input / output device.
[0060]
The voice input / output device 1 picks up surrounding voices by the microphones 7A to 7H.
When the arithmetic unit 41 detects the voice of the speaker W (s1), the sound source position
estimation circuit 44 estimates the position of the speaker W (s2).
Then, it is confirmed whether the current direction of the sound emission surface 2A of the
condenser speaker 2 is the direction of the speaker W (s3).
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When the current direction of the sound emission surface 2A of the condenser speaker 2 is the
direction of the speaker W, the sound source position estimation circuit 44 does not output the
sound source position information to the motor control circuit 45 and performs the process of
step s1. I do.
On the other hand, when the current direction of the sound emission surface 2A of the condenser
speaker 2 is different from the direction of the speaker W, the sound source position estimation
circuit 44 outputs the sound source position information to the motor control circuit 45. Then,
the motor control circuit 45 rotates the turntable motor 5A by a predetermined amount based on
the sound source position information to change the direction of the sound emitting surface 2A
of the condenser speaker 2 to the direction of the speaker W (s4).
[0061]
In this manner, the direction of the sound emission surface 2A of the capacitor speaker 2 is
changed, and the voice signal is input from the input terminal 49, whereby the voice is emitted in
the direction of the speaker W from the capacitor speaker 2 of the voice input / output device 1.
You can make it sound.
[0062]
As described above, according to the audio input / output device of the present invention, the
sound emission direction of the sound such as sound collection, diffusion, etc. with a simple
configuration without using a plurality of speaker units and without increasing the cost Can be
controlled.
[0063]
The voice input / output device 1 can be set so that the voices emitted from the condenser
speaker 2 can be concentrated at one point as described above, or can be set so that the voice
has straightness, so The curvature of the sound emitting surface 2A of the condenser speaker 2
may be set in advance in accordance with.
For example, when the voice input / output device 1 is placed at the border of two desks and
shared by two people, the distance from the desk border to the sitting position of the two users is
almost the same. The sound surface 2A may be formed into a concave curved surface, and this
distance may be set as the focal length.
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When the voice input / output device 1 is used by a plurality of users, when the distances to the
respective users are different from each other, it is preferable to make the sound emitting surface
2A of the condenser speaker 2 flat. As a result, when each user uses the voice input / output
device 1, the sound emitted from the condenser speaker 2 can be easily heard and sound leakage
can be prevented from occurring around the user.
[0064]
In the above description, the capacitor speaker 2 is used as the flat panel speaker unit of the
audio input / output device 1. However, the present invention is not limited to this, and the shape
of the diaphragm is flat or For example, a panel-type dynamic speaker may be used as long as it
is a flat panel speaker unit that can be set in a concave curved shape.
[0065]
Second Embodiment Next, a second embodiment of the voice input / output device of the present
invention will be described.
The voice input / output device according to the second embodiment includes a movable
mechanism that changes the curvature of the sound emission surface of the condenser speaker,
estimates the position of the speaker (sound source), and the voice emitted from the condenser
speaker is the speaker The configuration is such that the direction of the sound emission surface
of the condenser speaker and the position of the focal point are changed so as to focus on the
position of. Details will be described below.
[0066]
First, the entire configuration of the voice input / output device will be described. FIG. 7 is a
perspective view showing a schematic configuration of the voice input / output device. Here, the
same components as those of the voice input / output device 1 according to the first embodiment
described based on FIG. 1 are given the same reference numerals.
[0067]
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As shown in FIG. 7, the audio input / output device 101 is a flat panel speaker unit including a
capacitor speaker 102, a support 103, a rotary table 4, a rotation mechanism 5, fixed arms 6E,
microphones 7A to 7H, movable arms 108A, 108B. 108C, 108D, and movable mechanisms 109A,
109B, 109C, 109D.
[0068]
The capacitor speaker 102 emits a voice according to the voice signal input from the outside.
In addition, the capacitor speaker 102 has flexibility in a flat rectangular shape, and its shape can
be changed by the movable arms 108A to 108D and the movable mechanisms 109A to 109D,
and the sound emission range of sound is controlled. Is possible. The detailed configuration of
the capacitor speaker 102 is the same as that of the capacitor speaker 2 described with reference
to FIG.
[0069]
The support 103 is supported such that the sound emitting surface 102A of the condenser
speaker 102 is substantially perpendicular to the rotation table 4. In the column 103, holes
103C, 103D, 103E, and 103F are formed at the respective ends of which the movable arms 108A
to 108D penetrate. In addition, a fixed arm 6E is attached to a central portion of the support 103.
Furthermore, the support 103 is formed in a shape that does not contact the capacitor speaker
102 when the sound emitting surface 102A of the capacitor speaker 102 is deformed in a convex
curved shape or a concave curved shape (the wall surface of the support 103 in FIG. The example
which formed 103 A in convex curve shape is shown.).
[0070]
The rotating table 4 makes the column 103 to which the capacitor speaker 102 is connected
stand upright.
[0071]
As shown in FIG. 7B, the rotation mechanism 5 rotates the shaft 103G of the support column 103
by the rotation table motor 5A and the gear 5B which are built in so that the direction of the
sound emitting surface 102A of the condenser speaker 102 to the rotation table 4 is set. change.
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[0072]
The fixed arm 6E is for fixing the capacitor speaker 102 to the support column 103, and one end
thereof is fixed to the central portion of the capacitor speaker 102, and the other end is fixed to
the central portion of the support column 103.
[0073]
The microphones 7A to 7H are non-directional microphones attached to different positions on
the top surface 103B of the support column 103 and collecting surrounding sound.
[0074]
The movable arms 108A to 108D are for changing the curvature of the capacitor speaker 102 to
change its shape, one end of which is fixed to each end of the capacitor speaker 102, and the
other end is a hole 103C of the support column 103. It penetrates any of 103 F and extends to
the back surface 103 BB side of the wall surface 103 A of the support 103.
[0075]
The movable mechanisms 109A to 109D change the lengths of the movable arms 108A to 108D
attached to the ends of the capacitor speaker 102 extending from the holes 103C to 103F of the
support column 103, thereby the ends of the capacitor speaker 102 The distance between the
portion and the support 103 is changed to deform the capacitor speaker 102 into any of a planar
shape, a concave surface shape, or a convex surface shape.
[0076]
Next, the system configuration of the voice input / output device will be described.
FIG. 8 is a block diagram of the voice input / output device.
The same components as those of the voice input / output device 1 of the first embodiment
described with reference to FIG. 2 are denoted by the same reference numerals, and the detailed
description thereof is omitted.
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[0077]
The voice input / output device 101 includes a condenser speaker 102, microphones 7A to 7H,
an arithmetic unit 41, a rotary table motor 5A, and stepping motors 133A, 133B, 133C, and
133D, an operation unit 161, a storage unit 162, an output terminal 48, and an input. A terminal
49 is provided.
In addition, the arithmetic unit 41 includes an A / D conversion circuit 42, an adder 43, a sound
source position estimation circuit 44, a motor control circuit 145, an input speech emphasizing
circuit 46, and a wraparound sound estimation circuit 47.
[0078]
The microphones 7A to 7H, each part of the arithmetic unit 41 excluding the motor control
circuit 145, and the turntable motor 5A have the same configuration as the voice input / output
device 1, and perform the same operations.
[0079]
The motor control circuit 145 outputs a signal for rotating the turntable motor 5A and a signal
for rotating the stepping motors 133A to 133D based on the sound source position information
sent from the sound source position estimation circuit 44, The direction of the sound emitting
surface 102A and the focal position of the sound emitted from the condenser speaker 102 are
changed to the position of the sound source.
[0080]
The stepping motors 133A to 133D rotate in accordance with the signal output from the motor
control circuit 145, and change the extension lengths of the movable arms 108A to 108D from
the back surface 103BB of the wall surface 103A of the support column 103.
[0081]
The operation unit 161 is for the user to set the shape of the condenser speaker 102.
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The operation unit 161 is provided with a shape setting button for setting the shape of the
condenser speaker 102, a ten key for inputting a distance to the focal position, and a diffusion
angle.
When the user selects the shape (planar shape, convex curved surface, concave curved surface)
of the condenser speaker 102 from the operation unit 161, and selects the convex curved
surface, a range in which sound is emitted (sound emission angle), When the concave surface
shape is selected, it is possible to set the position of the focus (the focal distance from the sound
input / output device) for collecting the sound.
[0082]
The storage unit 162 stores the extension length of each of the movable arms 108A to 108D
according to the focal length and the sound release angle input from the operation unit 161, data
of the extension length set previously, and the like.
[0083]
The capacitor speaker 102 converts an audio signal input from the input terminal 49 into audio
and emits the audio.
The capacitor speaker 102 is configured to include the amplifier 21 and the bias power supply
22 described above.
[0084]
With the above configuration, the voice input / output device 101 estimates the position of the
speaker (sound source) W by the plurality of microphones 7A to 7H, rotates the support 3 by the
rotation mechanism 5, and emits the sound of the capacitor speaker 102. The direction of the
face 2A is changed to the direction of the speaker W, and the focus position of the sound emitted
from the capacitor speaker 102 is changed to the position of the speaker W.
[0085]
In addition, when the speaker W operates the operation unit 161 of the voice input / output
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device 101 to select the shape (planar shape, convex surface shape, concave surface shape) of
the capacitor speaker 102, the motor control circuit 145 operates the operation portion The
control information of the stepping motors 133A to 133D is read from the storage unit 162
according to the operation performed at 161.
Then, the motor control circuit 145 drives the stepping motors 133A to 133D to deform the
capacitor speaker 102 into the set shape.
In addition, the speaker W operates the operation unit 161 of the voice input / output device
101 to emit a voice from the condenser speaker 102 in a range (a voice emission angle) or a
position of a focal point where the voice is collected (voice input / output When the focal
distance from the device is set, the motor control circuit 145 similarly sets the curvature of the
condenser speaker 102 so as to be the set sound emission angle or the focal distance from the
audio input / output device 101.
[0086]
Next, the configuration for deforming the shape of the capacitor speaker 102 will be described in
detail.
FIG. 9 is a diagram for explaining a configuration for deforming the shape of the capacitor
speaker, and FIG. 9A is a top perspective view showing an example of a configuration for
deforming the capacitor speaker.
FIG. 9B is a specific configuration diagram of the movable mechanism 109A.
FIG. 9C is a top perspective view showing an example of a configuration different from FIG. 9A in
which the capacitor speaker is deformed.
[0087]
As shown in FIG. 9A, the movable arms 108A to 108D are each curved at a predetermined
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curvature, and screw grooves 108AM to 108DM are provided entirely from one end to the other
end. Further, as shown in FIG. 9B, movable mechanisms 109A to 109D are provided on the back
surface 103BB of the wall surface 103A facing the condenser speaker 102 of the support column
103. Here, since the movable mechanisms 109A to 109D have the same configuration, the
configuration will be described by taking the movable mechanism 109A shown in FIG. 9B as an
example.
[0088]
The movable mechanism 109A includes a gear 131A, a gear 132A, and a stepping motor 133A.
The gear 131A is for adjusting the extension length of the movable arm 108A from the support
column 103. A hole 131A1 is formed at the center, and a screw groove 131AM to be screwed
with the screw groove 108AM of the movable arm 108A is formed on the wall surface. Is formed.
The movable arm 108A is inserted (penetrated) into the hole 131A1, and the extension length of
the movable arm 108A is changed by the rotation of the gear 131A. The gear 131A is rotatably
attached to the back surface 103BB of the support 103. The gear 132A is for rotating the gear
131A, and the shaft of the stepping motor 133A is connected at the center. The stepping motor
133A is for rotating the gear 131A, transmits power to the gear 131A via the gear 132A, and
changes the extension length of the movable arm 108A from the support 103.
[0089]
In order to deform the shape of the capacitor speaker 102, it is also possible to configure as
shown in FIG. 9 (C). That is, movable arms 108A-108D of straight shape are used, and ball joints
or universal joints 108AJ-108DJ are provided at one end of each movable arm 108A-108D.
Then, these joints are connected to each end of the rectangular capacitor speaker 102. Further,
in the movable arms 108A to 108D, as in FIG. 9A, screw grooves 108AM to 108DM are provided
entirely from one end to the other end, and the other ends are holes 103C to 103F of the support
column 103 and gears 131A to 131D, respectively. It is made to penetrate to 131D. Then, by
operating the movable mechanisms 109A to 109D, the lengths of the other ends of the movable
arms 108A to 108D extending from the support column 103 are adjusted.
[0090]
FIG. 10 is a top view of the audio input / output device and a sound emission area in the case
where the sound emission surface of the capacitor speaker is concave, flat, and convexly curved.
04-05-2019
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[0091]
In the voice input / output device 101, as shown in FIG. 10A, the shape of the capacitor speaker
102 is concaved by adjusting the length of extending the movable arms 108A to 108D from the
back surface of the support column 103. By making it cylindrical, as shown in FIG. 10B, the
sound wave emitted from the condenser speaker 102 can be concentrated on one line.
Therefore, the sound propagates only in a narrow range, and it is attenuated because the sound
diffuses in the rear and in the far, and a sound field in which sound leakage hardly occurs can be
formed.
[0092]
Further, in the audio input / output device 101, changing the curvature of the concave surface of
the capacitor speaker 102 changes the range (area) in which the sound is emitted and changes
the propagation distance of the sound emitted from the capacitor speaker 102. it can.
[0093]
For example, when the curvature of a concave surface is reduced, sound can be propagated to a
distance.
On the other hand, when the curvature of the concave surface is increased, sound can be
propagated only in the vicinity of the speaker.
[0094]
Further, when the sound input / output device 101 has a sound source at a position separated
from the sound emitting surface 102A of the capacitor speaker 102 by a predetermined distance
or more, as shown in FIG. 10C, the sound emitting surface 102A of the capacitor speaker 102 is
Set flat. In this case, as shown in FIG. 10D, the sound wave emitted from the condenser speaker
102 has a high degree of straightness, so that it is possible to generate a sound field in which the
sound propagates to a small distance with little attenuation.
04-05-2019
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[0095]
As described above, the voice input / output device 101 estimates the position of the sound
source by a plurality of microphones as described later, and the curvature of the capacitor
speaker 102 is focused so that the sound emitted from the capacitor speaker 102 is focused at
the position of the sound source. Change
[0096]
Further, the voice input / output device 101 can make the condenser speaker 102 concave,
curved, or convex curved by operating the operation unit 161 to switch the setting.
For example, as shown in FIG. 10 (E), by adjusting the extension length of the movable arms
108A to 108D from the support column 103, the shape of the capacitor speaker 102 is not only
concave or flat, but also convex. Can be transformed into In this case, as shown in FIG. 10F, since
the sound wave emitted from the capacitor speaker 102 can be diffused, the sound can be
propagated over a wide range, and voices can be transmitted to a plurality of people. Can be
[0097]
Further, when the voice input / output device 101 is deformed in the concave curve shape of the
capacitor speaker 102 by the operation of the operation unit 161, the focal position of the sound
emitted from the capacitor speaker 102, the convex shape of the capacitor speaker 2 In the case
of changing to the above, the angle (range) at which sound is emitted from the capacitor speaker
102 can be set by the operation of the operation unit 161.
[0098]
Next, the sound source estimation operation of the voice input / output device 101 is as
described based on FIG. 5, and when the sound source position estimation circuit 44 estimates
the position of the speaker W, the motor control circuit 145 outputs the sound source position
information. The transmission is performed, and the rotary base motor 5A of the rotation
mechanism 5 and the stepping motors 133A to 133D of the movable mechanisms 109A to 109D
are driven to focus the sound emitted from the capacitor speaker 102 on pn.
[0099]
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Next, an operation in which the voice input / output device estimates the position of the sound
source and changes the direction of the capacitor speaker will be described based on a flowchart.
FIG. 11 is a flowchart for explaining the operation of the voice input / output device.
FIG. 12 shows the operation of the voice input / output device.
[0100]
The voice input / output device 1 picks up surrounding voices by the microphones 7A to 7H.
When the operation unit 41 detects the voice of the speaker W (s11), the sound source position
estimation circuit 44 estimates the position of the speaker W (s12). Then, it is checked whether
the current focal position of the sound emitting surface 2A of the condenser speaker 2 is the
estimated position of the speaker W (s13). The sound source position estimating circuit 44 does
not output the sound source position information to the motor control circuit 145 when the
current focal position of the sound emitting surface 2A of the condenser speaker 2 is the
estimated position of the speaker W, step s11. Perform the processing of On the other hand, as
shown in FIG. 12A, when the focal position of the sound emission surface 2A of the current
condenser speaker 2 is different from the estimated position of the speaker W, the sound source
position estimation circuit 44 It outputs to the motor control circuit 145. Then, based on the
sound source position information, the motor control circuit 145 rotates the turntable motor 5A
and the stepping motors 133A to 133D by a predetermined amount to emit the sound emission
surface 102A of the capacitor speaker 102 as shown in FIG. And the focus position of the sound
emitted from the condenser speaker 102 to the position of the speaker W (s14).
[0101]
As described above, by changing the focal position of the sound emitted from the sound emission
surface 102A of the capacitor speaker 102 and inputting the sound signal from the input
terminal 49, the speaker W from the capacitor speaker 102 of the sound input / output device
101 It is possible to emit a voice focused at an estimated position of.
[0102]
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As described above, according to the audio input / output device of the present invention, the
sound emission direction of the sound such as sound collection, diffusion, etc. with a simple
configuration without using a plurality of speaker units and without increasing the cost Can be
controlled.
[0103]
In the above description, the case of using the capacitor speaker 102 as the flat panel speaker
unit of the audio input / output device 101 has been described, but the present invention is not
limited to this, and the diaphragm has flexibility. The speaker may be, for example, a panel-type
dynamic speaker as long as it is a speaker whose shape can be made into a convex curved
surface, a flat surface, and a concave curved surface by changing the curvature of the diaphragm.
[0104]
It is a perspective view showing a schematic structure of a voice input / output device.
It is a block diagram of a voice input / output device.
It is a schematic block diagram of a capacitor | condenser speaker.
It is a figure which shows the sound emission area | region at the time of setting the top face
figure of a voice input / output device, and the sound emission surface 2A of a capacitor |
condenser speaker to concave curve shape and planar shape. It is a figure which shows
arrangement | positioning and the sound collection area | region of a microphone. It is a
flowchart for demonstrating the operation | movement of a voice input / output device. It is a
perspective view showing a schematic structure of a voice input / output device. It is a block
diagram of a voice input / output device. It is a figure for demonstrating the structure which
deform | transforms the shape of a capacitor | condenser speaker. It is a top view of a voice input
/ output device, and a figure showing the sound emission field at the time of making the sound
emission side of a condenser speaker into concave shape, plane shape, and convex curve shape.
It is a flowchart for demonstrating the operation | movement of a voice input / output device. It
is a figure showing operation of a voice input / output device.
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Explanation of sign
[0105]
1, 101-voice input / output device 2, 102-capacitor speaker 3, 103-post 4-rotary 5-rotation
mechanism 6A-6E-fixed arm 7A-7H-microphone 8A-8D, 109A-109D-movable mechanism 41Arithmetic unit 42-A / D conversion circuit 43-Adder 44-Sound source position estimation circuit
45-Motor control circuit 46-Input speech enhancement circuit 47-Loopback sound estimation
circuit 48-Output terminal 49-Input terminal 133A-Stepping motor 145- Motor control circuit
161-operation unit 162-storage unit
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