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JP2006186835

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DESCRIPTION JP2006186835
PROBLEM TO BE SOLVED: To make sensitivity adjustment easy in a microphone using light.
SOLUTION: A sensitivity switch 12 supplies a signal representing the position of a slider to a
microcomputer 100. The microcomputer 100 controls the motor of the laser emitting unit 30
according to the signal supplied from the sensitivity switch 12 to tilt the light source to a
predetermined angle. When the angle of the light source is changed, the number of times the
laser light is reflected on the inner circumferential surface of the reflection ring 20 changes, and
the optical path length of the laser light until it enters the laser light receiving unit 40 changes.
When the optical path length of the laser light changes, the amount of refraction of the laser light
changes, and even if the sound wave is the same, the amount of displacement of light entering
the laser light receiving unit 40 changes and the detection sensitivity of the sound wave changes.
[Selected figure] Figure 1
マイクロホン
[0001]
The present invention relates to a technology for detecting sound using light.
[0002]
As a microphone replacing the conventional dynamic type or condenser type, there is a
microphone disclosed in Patent Document 1.
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1
The microphone emits a laser beam into the air, and converts a change in the amount of
refraction of the laser beam caused by the laser beam contacting the acoustic wave into an
electrical signal. According to this microphone, it is possible to prevent the deterioration of the
vibrating part due to long-term use and the breakage of the vibrating part due to the excessive
input since the mechanical vibrating part is not required as in the dynamic type or the capacitor
type. There is. Unexamined-Japanese-Patent No. 5-227597
[0003]
In the microphone disclosed in Patent Document 1, the amount of refraction of the laser light
increases as the amount of the laser light touching the acoustic wave increases. Therefore, to
increase the sensitivity, the optical path length of the laser light is increased to lower the
sensitivity. For this purpose, the optical path length of the laser light is shortened. In the
microphone disclosed in Patent Document 1, although the optical path length is adjusted so that
the laser light is reflected between the plurality of reflecting mirrors, the reflecting mirror is
adjusted to change the sensitivity, and the optical path of the laser light There is a problem that
adjusting the length is inconvenient for the user and poor in practicality.
[0004]
The present invention has been made under the above-described background, and it is an object
of the present invention to provide a technique for facilitating sensitivity adjustment in a lightbased microphone.
[0005]
In order to solve the problems described above, according to the present invention, an annular
member having a reflective surface for reflecting light on its inner circumferential surface, and a
light source for outputting coherent light of a predetermined beam diameter toward the inner
circumferential surface of the annular member And control means for controlling an angle of
coherent light output from the light source toward the inner peripheral surface of the annular
member according to an instruction signal, and output from the light source and reflected by the
inner peripheral surface of the annular member The present invention provides a microphone
comprising: detection means for receiving the coherent light and detecting a beam position of the
received coherent light; and signal output means for outputting a signal corresponding to the
beam position detected by the detection means.
[0006]
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In a preferred embodiment, a plurality of the detection means may be provided, or a plurality of
light sources may be provided.
Further, the control means may control an angle of light so that light output from the light source
passes through a substantially central portion of a space formed by the inner peripheral surface
of the annular member.
Further, the detection means is disposed in the vicinity of the light source, and on the inner
circumferential surface of the annular member, a position facing the light source and a position
near the light source and the position detection means are made flat. It is also good.
[0007]
According to the present invention, sensitivity adjustment can be easily performed in a
microphone using light.
[0008]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
FIG. 1 is an external view of a microphone 1 according to an embodiment of the present
invention, and FIG. 2 is a block diagram showing a hardware configuration of the microphone 1.
As shown in FIG. 1, the microphone 1 includes a housing 10, a stand 50 for supporting the
housing 10, and a reflection ring 20 attached to the housing 10.
[0009]
The reflection ring 20 is an annular member, and the inner peripheral surface thereof is a mirror
surface by, for example, an aluminum deposition process. A part of the inner peripheral surface
of the reflection ring 20 is provided with a discharge port 31 for emitting a laser beam. Inside
the discharge port 31, a laser beam of a predetermined wavelength and a predetermined beam
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diameter ( A laser emitting unit 30 including a light source (not shown) for outputting coherent
light) and a tilt device (not shown) for varying the tilt angle of the light source by a motor and a
gear device is embedded. In addition, the wavelength of the laser beam which a light source
outputs can be arbitrarily selected from a visible region and an infrared region. In addition, an
entrance 41 is provided in a part of the inner peripheral surface of the reflection ring 20
adjacent to the outlet 31. The entrance 41 receives the laser beam output from the laser emitting
unit 30 and reflected by the inner peripheral surface. As shown in FIG. 3, a laser light receiving
unit 40 in which photoelectric conversion elements are arranged in an array is embedded in the
entrance 41. When laser light enters the laser light receiving unit 40, among the photoelectric
conversion elements arranged in an array, the photoelectric conversion element that detects the
light converts the light into an electric signal, and the generated electric signal is output as an
audio signal. Output to unit 110.
[0010]
In the region inside the reflection ring 20, when no sound wave is generated in the air, the laser
light output from the light source travels straight in the air, and is reflected by the inner
peripheral surface of the reflection ring 20 and Light in the center. On the other hand, when a
human emits a voice, a compressional wave is generated in the air, and the dense portion and the
coarse portion of the air propagate in the air and pass inside the reflection ring 20. And the laser
beam reflected by the inner peripheral surface of the reflective ring 20 will pass through the
inside of this air density. FIG. 4 is a diagram schematically showing the distribution of
compression and compression waves and the state of laser light refracted by the compression
and compression waves. As light travels through the medium and is refracted to the higher
density of the medium, in FIG. 4, the laser light is refracted toward the dense portion of the air.
Here, the amount of refraction of the laser light increases when the laser light passes through a
portion where the amount of change in air density is large (that is, the dense or rough portion of
the compressional wave), and the air density when no sound is generated It becomes smaller
when passing at the same density as. When the laser light is refracted, in the laser light receiving
unit 40, the incident position of the laser light is displaced from the center, and the amount of
displacement periodically changes according to the period of the compressional wave (that is, the
frequency of the sound). The amount of displacement increases in accordance with the amplitude
of (i.e., the sound pressure level of sound). That is, the displacement of the incident position of
the laser light represents a sound.
[0011]
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The audio signal output unit 110 analyzes the electric signal output from each photoelectric
conversion element, and specifies the photoelectric conversion element that has received the
light. Then, the distance from the position of the photoelectric conversion element that received
the light to the center point of the laser light receiving unit 40 is obtained. For example, the
voltage value is 0 at the center point, and corresponds to the distance when the distance from the
center point is long. Output a signal that becomes a voltage value. As described above, since the
displacement of the position of the laser light in the laser light receiving unit 40 represents
sound, the signal output corresponding to the detected position of the laser light represents
sound.
[0012]
On the surface of the housing 10, a power switch 11 for supplying power from a power supply
(not shown) to each part of the microphone 1 and a sensitivity switch 12 which is a slide switch
are disposed. Further, a microcomputer 100 is embedded in the housing 10. The sensitivity
switch 12 is a switch for adjusting the sensitivity of the microphone 1 and is connected to the
microcomputer 100. In the present embodiment, the sensitivity can be switched in four steps,
and the sensitivity switch 12 supplies a signal representing the position of the slider to the
microcomputer 100. The microcomputer 100 controls the motor of the laser emitting unit 30
according to the signal (instruction signal) supplied from the sensitivity switch 12 and tilts the
light source to a predetermined angle.
[0013]
The output angle and the trajectory of the laser beam for each position of the slider in the
sensitivity switch 12 are shown in FIG. When the slider of the sensitivity switch 12 is at the
position "4" at the left end, the laser beam is output from the laser emitting unit 30 at the angle
shown in FIG. The light is reflected on the locus shown in FIG. When the slider of the sensitivity
switch 12 is at the position of “3”, the laser beam is output from the laser emitting unit 30 at
the angle shown in FIG. 5B, and in FIG. The laser beam is reflected by the locus shown in FIG.
When the slider of the sensitivity switch 12 is at the position “2”, the laser beam is output
from the laser emitting unit 30 at the angle shown in FIG. The light is reflected by the locus
shown in (c) and enters the laser light receiving unit 40. When the slider of the sensitivity switch
12 is at the right end “1” position, the laser beam is output from the laser emitting unit 30 at
the angle shown in FIG. The light is reflected on the locus shown in FIG.
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[0014]
As described above, when the position of the slider is “4”, the laser light is reflected on the
inner circumferential surface of the reflection ring 20 a plurality of times, and the optical path
length of the laser light until it enters the laser light receiving unit 40 becomes long. . Then, by
refracting a plurality of times, the amount of displacement of light entering the laser light
receiving unit 40 from the center point becomes large, and sound can be detected with high
sensitivity. On the other hand, when the position of the slider is moved to 3, 2 or 1, the number
of times of reflection on the inner circumferential surface decreases according to the position of
the slider, and the optical path length of the laser light before entering the laser light receiving
unit 40 is short. Become. Then, the number of times the laser light touches the sound wave
decreases, so the amount of refraction of the laser light decreases, and the light incident on the
laser light receiving unit 40 has a small amount of displacement from the central point even if
the sound wave is the same. The detection sensitivity of As described above, according to the
present embodiment, the optical path length of the laser beam can be changed by a simple
operation, and the sound detection sensitivity can be easily changed. Further, according to the
present embodiment, since the laser light passes only the closed region in the reflection ring 20,
the laser light does not enter the human eye, and the voice can be detected safely.
[0015]
[Modifications] Although the embodiment of the present invention has been described above, the
present invention is not limited to the above-described embodiment, and can be practiced in
various other forms. For example, the above-described embodiment may be modified as follows
to implement the present invention.
[0016]
In the reflection ring 20, the portion between the outlet 31 and the inlet 41 and the portion
facing the outlet 31 and the inlet 41 are made flat as shown in FIG. 6A, and the laser light
emitted from the light source is Only the plane portion may be reciprocated to be incident on the
laser light receiving unit 40. Further, in this aspect, as shown in FIG. 6B, the sensitivity may be
lowered by setting the number of times of reflection of the laser light to one. Further, the
member on which the reflecting surface is formed may be polygonal instead of ring-shaped. In
addition, the position of the laser light receiving unit 40 is not limited to the vicinity of the laser
emitting unit 30, and may be disposed at an arbitrary position on the inner circumferential
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surface of the reflection ring 20.
[0017]
In the embodiment described above, the laser emitting unit 30 and the laser receiving unit 40 are
one by one, but as shown in FIG. 6C, the laser emitting unit 30 and the laser receiving unit 40 are
not The sound may be analyzed from the detection results of the two laser light receiving units
40 provided as one set. Alternatively, only a plurality of laser light receiving units 40 may be
provided on the inner peripheral surface of the reflection ring 20 so that laser light can be
received at various positions. As described above, when laser light can be received at a plurality
of positions, not only paths of laser light shown in the drawing but various paths can be adopted,
and the number of reflections is changed to adjust the sensitivity more finely. It is possible to
Further, as shown in FIG. 7A and FIG. 7B, the sensitivity may be adjusted such that the laser
beam passes only a portion close to the inner circumferential surface of the reflection ring 20.
[0018]
A distance sensor using ultrasonic waves may be provided in the housing 10, and the distance
sensor may measure the distance between the user and the microphone 1, and the emission
angle of the laser may be varied according to the measured distance. .
[0019]
The inner peripheral surface may be constituted by a plurality of mirrors, and the optical path
length of the laser light may be varied by varying the angle of each mirror according to the
setting of the sensitivity switch 12.
[0020]
FIG. 1 is an external view of a microphone 1 according to an embodiment of the present
invention.
FIG. 2 is a block diagram showing a hardware configuration of a microphone 1;
It is an external view of a laser receiving part. It is a figure which represented the coarse and
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dense of the sound wave typically. It is a figure showing the locus of a laser beam. It is the figure
which showed the microphone concerning the modification of the embodiment. It is the figure
which showed the locus | trajectory of the laser beam which concerns on the modification of the
embodiment.
Explanation of sign
[0021]
DESCRIPTION OF SYMBOLS 1 ... Microphone, 10 ... Housing | casing 11, 11 ... Power switch, 12 ...
Sensitivity switch, 20 ... Reflection ring, 30 ... Laser emission part, 31 ... Emission port, 40 ... laser
light receiving part, 41 ... entrance, 50 ... stand, 100 ... microcomputer, 110 ... audio signal output
part.
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