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JP2002101498

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2002101498
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
voice input of communication devices and information processing devices, and more particularly
to a voice input device whose directivity can be changed.
[0002]
2. Description of the Related Art As an audio input technology for making spatial directivity
variable, there is a microphone array technology in which microphones are disposed on a plane.
Japanese Patent Application No. 11-510765 entitled "Voice Monitor System Using Laser Light" is
a system for changing the fluctuation of the reflected light of the laser beam into a voice signal.
Moreover, Japanese Patent Application No. 2000-78695 "directive optical microphone" is a thing
which arrange | positions multiple reflecting films and comprises a high directivity microphone.
[0003]
In the above-mentioned Japanese Patent Application No. 11-510765 (refer to WO 99/06804),
the window of the room is irradiated with a laser light transmitter, and the voice inside the room
is monitored by the receiver outside the room. The configuration is disclosed.
[0004]
05-05-2019
1
In Japanese Patent Application No. 2000-78695, in a directional optical microphone, a plurality
of transparent vibrating films transmitting light beams are arranged in an array in a direction in
which the light beams of the semiconductor laser travel straight. A configuration is described in
which a plurality of light beam position sensors for detecting reflected light from a vibrating film
are provided.
According to the invention of this publication, when a sound wave is applied to the transparent
vibrating film, the transparent vibrating film vibrates, and the irradiation position of the reflected
light beam reflected from the transparent vibrating film changes, so this position change is By
detecting with the beam position sensor, it is possible to detect a change in vibration of the
sound wave, and it is possible to selectively increase the S / N ratio of only radio waves in the
direction straight to the light beam and the direction perpendicular thereto.
[0005]
In the microphone array technology in which a plurality of microphones are arranged to make
directivity changeable, in order to improve the discrimination of the direction of the sound
source from the relationship of the speed of sound, the distance between the microphones is
required. There is a problem that the scale of the voice input system must be increased. There is
also the problem that it is difficult to change the size or position of the array.
[0006]
In the technique described in Japanese Patent Application No. 2000-78695, a plurality of
transparent vibrating films are arranged in series in a cylindrical body, and each transparent
reflective film and a light beam position sensor are paired. Since it is determined in 1, it is
necessary to make the distance between the transparent reflection films sufficiently wide. In
addition, since the light beam is sequentially input to the transparent reflection film of the next
stage, a circuit or the like is required to process the signal which has been folded, which results
in an increase in cost.
[0007]
05-05-2019
2
The present invention has been made to solve the above-mentioned problems, and realizes a
voice input device on a small scale and high directivity as compared with the conventional
microphone array technology, and achieves sharpness and sensitivity of directivity. An object of
the present invention is to provide a voice input device capable of easily changing a required
frequency band. Another object of the present invention is to provide a low-cost voice input
device in which one unit is constituted by a pair of laser beam oscillation elements and light
receiving elements.
[0008]
SUMMARY OF THE INVENTION In order to achieve the above object, in a voice input device
according to the present invention, a curved surface is divided into a plurality of sections in
correspondence with the amplitude and period of sound. A vibrating film is provided which
vibrates to reflect light, and a reflecting plate having a structure in which the vibrating film in
each section vibrates independently with respect to a sound source, and a laser beam is
irradiated to the vibrating film of the reflecting plate And a light receiving element for receiving
reflected light from a vibrating film vibrating with respect to the sound source of the reflecting
plate and digitizing a change in the reflected light and outputting the light, and the light source is
perpendicular to the sound source The directivity is changed in an arbitrary direction
perpendicular to the reflection surface of the vibrating film by specifying the vibrating film
having a relationship and processing only the received signal at the coordinate position of the
light receiving element corresponding to the vibrating film. It is characterized by
[0009]
According to the present invention, since the fluctuation of the vibration is maximum when the
diaphragm is perpendicular to the direction of the sound source, the diaphragm of the reflector
having a curved surface perpendicular to the intended direction of directivity is used. The
displacement of the reflected light is quantified by the light receiving element, and the numerical
value corresponding to the coordinate position of the light receiving surface of the light receiving
element is selected to change the sharpness and direction of directivity.
The beam output from the laser light oscillator is diffused by a lens so as to spread on a curved
reflector, and the reflected light is digitized as an audio signal by a light receiving element and
converted into an audio signal.
[0010]
05-05-2019
3
According to the present invention, directivity is easily determined by using one light receiving
element to specify the vibrating film of the reflecting plate perpendicular to the sound source
and determining the coordinate position of the light receiving element corresponding to the
vibrating film. The voice input device corresponding to can be obtained. In addition, an audio
input device capable of changing the sharpness and direction of directivity can be realized more
compactly than the conventional microphone array technology disposed on a plane.
[0011]
DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings. FIG. 1 shows a first embodiment of a
microphone which is a voice input device of the present invention, and is a configuration view
seen from a cross section. The hemispherical microphone 10 provided by the present invention is
composed of a laser light oscillator 11, a diffusing lens 12, a vibrating film 13, a reflecting plate
14, and a light receiving element 15. Then, after the signal received by the light receiving
element 15 of the microphone 10 is temporarily stored in the memory 17, the voice output
conversion processing unit 18 performs voice conversion processing and outputs the voice.
[0012]
The reflecting plate 14 has a hemispherical curved surface divided into a plurality of sections by
a frame 16. The portion surrounded by the frame 16 vibrates in response to the amplitude and
period of the external sound source to generate light. A vibrating membrane 13 that reflects is
stretched. Thus, the reflecting plate 14 has a structure in which each vibrating film 13 of each
section vibrates independently with respect to the sound source.
[0013]
The laser beam oscillator 11 irradiates the vibrating film 13 of the reflection plate 14 with a laser
beam. Then, the light receiving element 15 receives the change of the reflected light from the
vibrating film 13 of the reflection plate 14, and the light receiving element 15 digitizes the
change and outputs it to the memory 17.
05-05-2019
4
[0014]
In the present invention, by utilizing the characteristic that the vibrating membrane 13 has the
maximum sensitivity to the sound source in the vertical direction, the signal of the specific
position corresponding to each vibrating membrane of the light receiving element 15 is
selectively processed. It is characterized in that the directivity is changed in any direction
perpendicular to. For example, it is known in advance that the diaphragm 13a is in a vertical
relationship in the sound input direction from the sound source A to obtain an output of
maximum sensitivity. Therefore, by selectively processing only the signal at the specific position
15a of the light receiving element 15 corresponding to the diaphragm 13a, it is possible to
perform voice input in which the directivity is sufficiently exhibited for the sound source.
[0015]
Next, the operation of the first embodiment of the present invention will be described. The light
output from the laser light oscillator 11 is diffused by the diffusing lens 12 and irradiated to the
reflecting plate 14 having the vibrating film 13 in the hemispherical surface. Each vibrating film
13 of the reflection plate 14 vibrates independently by external sound, and the irradiated laser
light is reflected from each vibrating film 13, and the reflected light is received by the light
receiving element 15. Then, the light receiving element 15 digitizes and outputs the displacement
of the intensity of the reflected light.
[0016]
For example, in an information device having a voice input function (microphone), the direction
(sound source) of the voice input to the microphone is specified by the location and height at
which the device is installed. For example, the vibrating membrane 13a of the microphone 10
having a vertical relationship with the sound direction of the sound source A is identified, and the
coordinate position for detecting the reflected light of the light receiving element 15
corresponding to the identified vibrating membrane 13a. 15a is determined. As a result, only the
signal of the reflected light input to the determined coordinate position 15a is stored in the
memory 17 at a predetermined interval, and the signal of the memory 17 is converted by the
voice output conversion processing unit 18 into a voice waveform. Process and output voice.
05-05-2019
5
[0017]
As described above, since the vibrating film of the reflecting plate is specified by the sound input
direction of each sound source, the coordinate position of the light receiving element
corresponding to the vibrating film is further specified. By performing selection processing only,
a voice input device that can handle directivity can be achieved.
[0018]
When the directivity of the microphone 10 is made sharp, the area of the light receiving surface
(seat surface) for receiving the reflected light of the light receiving element 15 is made small, and
when the directivity is taken wide, the light receiving element 15 is made. The area of the light
receiving surface for receiving the reflected light of the above may be increased.
The direction of the directivity of the microphone 10 corresponds to the coordinate position of
the light receiving surface of the light receiving element 15 by selectively changing it.
[0019]
When the directivity is determined in the intended direction, weighting is performed according to
the distance from the center with the specified coordinate position of the light receiving element
corresponding to the vibrating film as the center, and the received signals are added. It may be
possible to change the sharpness of the directivity. Conversely, the detection of sound may be
performed by removing the reception signal weighted according to the distance from the center
as the noise component from the reception signal at the center. For example, when a person
speaks, the voice input direction to be generated is determined, and the reflected light input to
the coordinates of the light receiving element corresponding to the diaphragm having a vertical
relationship with the voice input direction is signal-processed. Correct sound processing can be
performed by processing the reflected light from sounds from the surroundings other than that
as noise.
[0020]
Further, in the case where the light receiving element 15 detects only an input signal lower than
a predetermined level (for example, when only voice corresponding to noise is input from the
periphery of the microphone), the input signal is processed with equal weighting. The directivity
may be set, and on the other hand, when a signal of a predetermined level is detected, the above-
05-05-2019
6
described weighting processing for improving the directivity may be executed.
[0021]
When a plurality of input signals having a predetermined level or more are detected, audio
components can be extracted independently by processing reflected light corresponding to a
plurality of audio input directions.
This can be realized by obtaining displacement amounts of a plurality of reflected lights input to
the light receiving surface of the light receiving element every time and converting the change
amounts of the respective coordinates into audio signals.
[0022]
Further, if an element with high resolution is used as the light receiving element 15, by
processing the reflecting plate 14 so as to reduce the light receiving area of the reflected light,
the portion of the light receiving element 15 can be miniaturized.
[0023]
Further, as to the diffusing lens 12, in addition to one which diffuses uniformly to the reflecting
plate 14, a multifocal lens corresponding to the vibrating film 13 and focusing near the light
receiving surface is used to obtain a high resolution light receiving element 15. It is possible to
miniaturize by adopting
[0024]
FIGS. 2 (a) and 2 (b) show an example of the construction of the reflecting plate 14. FIG.
The resolution of the target frequency region and the direction from the sound source can be
easily changed only by changing the reflection plate 14 having the diaphragms 13 of different
areas.
[0025]
05-05-2019
7
FIG. 3 shows a second embodiment of the present invention, and is an example in which a
plurality of microphones 10 shown in FIG. 1 are arranged.
Since the light receiving positions corresponding to a plurality of sound sources are different, it is
possible to process a plurality of sound sources simultaneously.
[0026]
That is, by arranging a plurality of microphones 10 and extracting signals having high
correlativity at each voice input at positions where directional axes of the voice inputs intersect,
the sound source at that point is selected as the input. To process. In addition, the high
correlation component of the signal pair corresponding to each voice input is extracted
independently for the sound sources at a plurality of positions, and an input signal for a plurality
of sound sources is simultaneously selected. Thus, by arranging a plurality of voice input devices,
for example, even if the directions of the sound source A and the sound source C overlap with
one voice input device and only the signal of the sound source C can be processed, the other
voice input device In this case, the signals of the sound sources A and C are obtained to enable
voice input.
[0027]
According to the present invention, by using one light receiving element, the vibrating membrane
of the reflection plate perpendicular to the sound source is specified, and the coordinate position
of the light receiving element corresponding to the vibrating membrane is determined. Thus, it is
possible to easily obtain a voice input device compatible with directivity. In addition, an audio
input device capable of changing the sharpness and direction of directivity can be realized more
compactly than the conventional microphone array technology disposed on a plane. Further, in
the present invention, the resolution regarding the direction of the sound source can be easily
changed only by replacing the reflecting plate. Furthermore, even in the case where a plurality of
directional variable voice input devices are arranged to improve sensitivity, it is not necessary to
provide a distance between microphones, and downsizing is possible.
[0028]
05-05-2019
8
Brief description of the drawings
[0029]
1 is a first embodiment of the present invention, a diagram showing a configuration of a
microphone according to a voice input device.
[0030]
2 shows an embodiment of a reflector applied to the microphone of the present invention.
[0031]
3 is a second embodiment of the present invention, showing a configuration in which a plurality
of voice input devices are provided.
[0032]
Explanation of sign
[0033]
DESCRIPTION OF SYMBOLS 10 Microphone 11 Laser light oscillator 12 Diffusion lens 13
Vibrating film 14 Reflecting plate 15 Light receiving element 16 Frame 17 Memory 18 Audio
output conversion processing unit
05-05-2019
9
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