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JP2015012562

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2015012562
An object of the present invention is to miniaturize a holding housing of a microphone and to
suppress deterioration of acoustic characteristics of a sound collected in a sound collection
space. SOLUTION: A microphone array device 11 is disposed in a sound collecting space 19, and
a plurality of microphone units 13 in which microphone elements are accommodated in a
microphone holder, and acoustically transparent in which one end portion is fixed to each
microphone unit A plurality of pipes 15 and a tube holding member 17 which is disposed outside
the sound collection space 29 behind the microphone reception sound surface 27 of the
microphone unit, and the other end of each tube is fixed to support the microphone unit
,including. [Selected figure] Figure 1
Microphone array device
[0001]
The present invention relates to a microphone array device that picks up sound in a
predetermined sound collection space using a plurality of microphones.
[0002]
In a surveillance system conventionally installed at a predetermined position (for example, a
ceiling or a stand) at a factory, a company, a store (for example, a retail store or bank) or a public
place (for example a library), a plurality of camera devices (for example pan tilt) via a network By
connecting a camera device or an omnidirectional camera device, video data (still images and
moving images) of the monitoring target range is included.
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The same applies hereinafter).
[0003]
In addition, there is a limit to the amount of information that can be obtained by monitoring only
video, so by placing not only the camera device but also the microphone array device, there is a
need for a monitoring system that obtains audio data in the direction of imaging by the camera
device. high. Although a camera device provided with a microphone in advance is also
commercialized, such a camera device often has a sound collection accuracy that is not as good
as that of the microphone array device.
[0004]
Here, a video conference system including an omnidirectional camera and a microphone array
that can be used for recording electronic conferences and meetings is known (see, for example,
Patent Document 1). In the teleconferencing system shown in Patent Document 1, the
omnidirectional camera and microphone array are integrated as a device for recording
teleconferencing and meetings, and conference rooms are used to minimize acoustic reflections
from the table. Placed on a flat surface (eg, a table) installed on the
[0005]
The omnidirectional camera and the microphone base holding the microphone array are
connected via an acoustically transparent cylinder. A signal at an audio frequency of about 50 to
4000 Hz, which corresponds to the frequency of the participant's voice, is picked up at all the
microphones in the microphone base via the cylinder. Thus, the system shown in Patent
Document 1 can easily improve the sound quality of the speaker by filtering the sound source
localization, that is, the position of the speaker, and beam forming, that is, only the sound from a
specific direction.
[0006]
Patent No. 4252377
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[0007]
However, in Patent Document 1, when a plurality of microphones are collectively installed in a
large case (for example, a microphone base shown in Patent Document 1), the acoustic
characteristics of the collected sound are affected by the shape of the case. May deteriorate.
[0008]
For example, the baffle effect causes rise in sound pressure level, generation of peaks or valleys
of amplitude due to the frequency used, or occurrence of phase lead or phase lag, and
measurement of the sound waveform collected by the microphone array device. The problem
arises that the value and the theoretical value diverge.
[0009]
In order to solve the above-described conventional problems, the present invention provides a
microphone array device that reduces the size of the holding housing of the microphone and
suppresses the deterioration of the acoustic characteristics of the sound collected in the sound
collection space. To aim.
[0010]
According to the present invention, a plurality of microphone units are disposed in a
predetermined sound collection space and a sound collection element is accommodated in a
predetermined microphone holding portion, and acoustically transparent in which one end is
fixed to each of the microphone units A plurality of tubes, and a holding unit disposed outside
the sound collection space behind the microphone receiving sound surface of the microphone
unit, the other end of each of the tubes being fixed and supporting the microphone unit , And a
microphone array device.
[0011]
According to the present invention, it is possible to miniaturize the holding housing of the
microphone and to suppress the deterioration of the acoustic characteristics of the sound
collected in the sound collection space.
[0012]
Side view of the microphone array device of the present embodiment (A) A cross-sectional view
of the microphone unit in which the microphone element is provided in the microphone holder,
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(B) a cross section of the microphone unit in which the microphone element and the relay
substrate are provided in the microphone holder (C) A cross-sectional view of a microphone unit
in which a microphone element, a relay substrate and an LED are provided in a microphone
holder (A) A microphone array device in which microphone units suspended from a tube holding
member with a ceiling are arranged in a plane 3B is a bottom view of the microphone array
device shown in FIG. 3A from below (A) the side surface of the microphone array device in which
the microphone units suspended from the tube holding member with a ceiling are spherically
arranged (B) Bottom view from below of the mask array device shown in FIG. 4 (A) (A) A tube
holding member with a ceiling to which the cable is directly fixed in FIG. 1 supports the
microphone unit (B) A microphone array designed as a chandelier type in which microphone
units are arrayed in a plane, with (B) a sectional view showing how a tube holding member with a
ceiling to which a pipe is fixed supports the microphone unit. (B) Side view of the microphone
array device shown in FIG. 6 (A) from the bottom (A) Side view of the microphone array device
designed as a chandelier type in which the microphone units are arranged spherically (B) 7A is a
bottom view of the microphone array device as viewed from below FIG. 7A is a side view of the
microphone array device in which the network transmission unit is accommodated in the tube
holding member. A block diagram showing a circuit configuration of a microphone array device
provided with the same number of microphone amplifiers and A / D converters, and one control
unit and interface, (B) Microphone A block diagram showing a circuit configuration of a
microphone array device in which the same number of microphone amplifiers as the number of
microphone elements are provided in a knit, (C) A tube holding member is provided with the
same number of microphone amplifiers as the number of microphone elements. Block diagram
showing the circuit configuration of the microphone array device A side view of the microphone
array device designed in a candlestick type
[0013]
Hereinafter, an embodiment of the microphone array device according to the present invention
(hereinafter, referred to as "the present embodiment") will be described with reference to the
drawings.
[0014]
FIG. 1 is a side view of the microphone array device 11 of the present embodiment.
A microphone array device 11 shown in FIG. 1 is configured to include a plurality of microphone
units 13, pipes 15 as a plurality of tubes, and a tube holding member 17 as a holding portion.
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The pipes 15 are provided in one-to-one correspondence with the number of the microphone
units 13.
[0015]
The microphone unit 13 is disposed in a predetermined sound collecting space 19.
A sound collecting space 19 (see a dot pattern portion shown in FIG. 1) is, for example, a beam
known to the control unit (see FIG. 9A, FIG. 9B or 9C) of the microphone array device 11
described later. It is a space formed based on the directivity formed for each microphone unit 13
using a forming technology.
Therefore, the microphone array device 11 can pick up the voice in the sound collection space
19 with high accuracy, and the volume level of the collected voice in the sound collection space
19 is higher than the volume level of the collected voice outside the sound collection space 29. It
can increase relatively.
[0016]
The microphone unit 13 is covered by a microphone holder 21 (see FIG. 2A).
Inside the microphone holder 21, a microphone element 23 as a sound collection element is
accommodated.
As the microphone element 23, for example, a high-quality small electret condenser microphone
(ECM: Electret Condenser Microphone) is used, and so on.
[0017]
One end of the pipe 15 is fixed to each microphone unit 13, and the other end is fixed to the tube
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holding member 17.
The pipe 15 has a function as an acoustically transparent support.
The pipe 15 has a space for inserting the electric wire 25 inside, and a pipe made of synthetic
resin (for example, plastic or elastomer) or a pipe made of metal is used, for example. In addition,
it is unpreferable to use for the pipe 15 a solid rod body filled with contents. This is because, for
example, when the electric wire 25 (see FIG. 2A) is provided on the outer periphery of the pipe
15, the pipe 15 can not be acoustically transparent.
[0018]
The tube holding member 17 is disposed outside the sound collection space 29 rearward
(upward as shown in FIG. 1) of the microphone reception sound surface 27 of the microphone
unit 13. The sound collection space exterior 29 is a space excluding the sound collection space
19 formed by the control unit (see, for example, FIG. 9A, FIG. 9B, or FIG. 9C) of the microphone
array device 11 described above. The other end of each pipe 15 is fixed to the pipe holding
member 17. Thus, the tube holding member 17 can support all the microphone units 13 via the
pipes 15. The tube holding member 17 is suspended from a ceiling attachment member 35
described later by, for example, a cable 31. The cable 31 is supported by a ceiling mounting
member 35 fixed to the ceiling 33.
[0019]
In the microphone array device 11, the electric wire 25 connected to the microphone unit 13 is
routed through the pipe 15, the tube holding member 17, the cable 31 and the ceiling
attachment member 35 on the back side of the ceiling 33 or wall (not shown) Be done. The
microphone array apparatus 11 is connected to a network (not shown), for example, to a host
computer installed in a central control room (not shown). The control unit (see, for example, FIG.
9A, FIG. 9B, or FIG. 9C) of the microphone array device 11 performs predetermined voice
processing (for example, synthesis) on the voice signal collected by each of the microphone units
13. Process) and transmit an audio file of audio data after audio processing to the host computer.
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[0020]
In the microphone array device 11, a plurality of microphone units 13 disposed in the sound
collection space 19 are supported by the pipe 15 by the tube holding member 17 disposed
outside the sound collection space 29. The pipe 15 is disposed from the sound collecting space
19 to the outside of the sound collecting space 29. As mentioned above, the pipe 15 is
acoustically transparent.
[0021]
Here, acoustically transparent means that the acoustic impedance does not change and the
reflection or refraction of the sound wave occurs in a state where the outer diameter of the pipe
15 is 1⁄4 or less of the wavelength λ of the upper limit frequency of the sound to be collected.
Since this does not occur, it means that the attenuation of the amplitude of the audio signal does
not occur. For example, in the case where the microphone array device 11 picks up sound having
an upper limit frequency of 8 kHz, assuming that the sound velocity is 340 m / s, λ = 42.5 mm.
Therefore, if the outer diameter of the pipe 15 is 10.6 mm or less corresponding to 1⁄4 of the
wavelength λ, the pipe 15 can be regarded as acoustically transparent, and the amplitude of the
collected voice waveform in the pipe 15 is It will not decay. In the present embodiment, the outer
diameter of the pipe 15 is set to 10.6 mm or less.
[0022]
As described above, in the microphone array device 11 of the present embodiment, the
microphone unit 13 is supported in the sound collecting space 19 by the acoustically transparent
pipe 15, the amplitude of the audio signal is not attenuated in the pipe 15, and the acoustic
reflection is also performed. It does not occur. That is, the microphone array device 11 of this
embodiment has the same configuration as that in the case where only a plurality of microphone
units 13 are disposed in the sound collection space 19.
[0023]
Thereby, the microphone array device 11 of this embodiment is, for example, the deterioration of
the acoustic characteristics of the collected voice due to the influence of the case shape when a
plurality of microphones are collectively installed in a large case, for example, the sound pressure
due to the baffle effect It is possible to suppress the rise of the level, the generation of peaks or
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valleys of the amplitude due to the used frequency, the generation of the phase lead or the phase
delay, and the reduction of the deviation between the measured value and the theoretical value of
the collected speech waveform. .
[0024]
In addition, since the microphone array device 11 according to the present embodiment supports
the plurality of microphone units 13 using the small diameter pipe 15, for example, the aesthetic
decoration effect on the shape of the interior furniture such as a chandelier or a candlestick can
be easily performed. can get.
[0025]
Further, in the microphone array device 11 of the present embodiment, the microphone holder
21 may be acoustically transparent.
In this case, in addition to the pipe 15, the size of the microphone holder 21 of the microphone
array device 11 is also acoustically transparent (the outer diameter is 10.6 mm or less).
As a result, the microphone array device 11 can be configured as acoustically transparent to the
pipe 15 and the microphone holder 21 and arranged only in the sound collecting space 19 with
the microphone element 23, and the sound is attenuated in the sound collecting process. It is
possible to further suppress the occurrence of the voice and to pick up the voice with high
accuracy.
[0026]
Next, a modification of the microphone array device 11 will be described.
[0027]
FIG. 2A is a cross-sectional view of the microphone unit 13 in which the microphone element 23
is provided in the microphone holder 21.
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FIG. 2B is a cross-sectional view of the microphone unit 41 in which the microphone element 23
and the relay substrate 39 are provided in the microphone holder 37. FIG. 2C is a cross-sectional
view of the microphone unit 47 in which the microphone element 23, the relay substrate 71, and
the LED 45 are provided in the microphone holder 43.
[0028]
The cross-sectional view shown in FIG. 2A is, for example, a cross-sectional view of the
microphone unit 13 of the present embodiment described above. As shown in FIG. 2A, the
microphone unit 13 has a configuration in which a microphone element 23 is provided in a
cylindrical microphone holder 21 with a bottom. The lower side of the microphone holder 21 is
open. In the opening, a holder cap 49 for exposing the microphone element 23 is attached. The
microphone element 23 is held by the holder cap 49 via the anti-vibration rubber 51. The antivibration rubber 51 is sandwiched between the microphone holder 21 and the holder cap 49.
Further, the microphone element 23 exposed from the holder cap 49 is covered by a windshield
53 (for example, a wire mesh). The electric wire 25 inserted into the pipe 15 is connected to the
microphone element 23 held by the microphone holder 21 and the holder cap 49.
[0029]
As shown in FIG. 2B, the microphone unit 41 has a configuration in which the microphone
element 23 and the relay substrate 39 are provided in the microphone holder 37. On the relay
board 39, a microphone amplifier 55 for amplifying an audio signal is mounted. The relay board
39 is connected to the microphone element 23. The relay substrate 39 is sandwiched from above
and below by the collar 57 and the spacer 59. The collar 57 and the spacer 59 are sandwiched
by the microphone holder 37 and the holder cap 61. Also, in this example, the upper end edge of
the windshield 53 is sandwiched by the spacer 59 and the holder cap 61. The holder cap 61 is
inserted and fixed to the lower opening of the microphone holder 37 by a locking structure or a
screw.
[0030]
Also, in this example, a microphone cable 63 is used as the pipe 15. In the microphone cable 63,
the coated electric wire 25 is reinforced by the tensile strength material. The electric wire 25 is
connected to the relay board 39. That is, the electric wire 25 is connected to the microphone
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element 23 through the relay substrate 39. As a tensile strength material, a steel wire or an
aramid fiber etc. are used, for example. A through hole 65 is formed in the bottom of the
microphone holder 37 (the upper side through which the microphone cable 63 is inserted). A
cable fixing member 69 having a flange 67 is fixed to the through hole 65 by being prevented
from being pulled upward. The tensile strength material of the microphone cable 63 is fixed to
the cable fixing member 69. Thus, the microphone holder 37 is directly supported by the
microphone cable 63.
[0031]
As shown in FIG. 2C, the microphone unit 47 has a configuration in which the microphone
element 23, the relay substrate 71, and the LED 45 are provided in the microphone holder 43.
The relay substrate 71 is accommodated in the microphone holder 43. On the relay substrate 71,
a microphone amplifier 55 for amplifying an audio signal is mounted on the upper surface, and
an LED 45 as an LED light emitting element is mounted on the lower surface. A cylindrical light
guide 73 is inserted into and fixed to the lower opening of the microphone holder 43. The light
guide 73 holds the microphone element 23 in the inner space. The microphone element 23 is
held in the inward space of the light guide 73 via the anti-vibration rubber 51 and the windshield
53. The light guide 73 propagates the light of the LED 45 irradiated to the upper cylindrical end
surface 75 and emits the light from the lower cylindrical outer surface 77. Thereby, the
microphone unit 47 can obtain an illumination effect (for example, a high aesthetic decoration
effect as interior furniture) by lighting of the LED 45. Also in the microphone unit 47, the
microphone holder 43 is directly supported by the microphone cable 63 via the cable fixing
member 69.
[0032]
As described above, in the microphone array device 11, the LEDs 45 in the microphone holder
43 are provided to light up the LEDs 45 in the microphone unit 47 in a predetermined order or
selectively, whereby illumination or decoration using each microphone unit 47 is performed.
(Illumination) can be realized, and a high aesthetic decoration effect as an interior can be
obtained.
[0033]
FIG. 3A is a side view of the microphone array device 81 in which the microphone units 13
suspended from the ceilinged tube holding member 79 are arranged in a plane.
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FIG. 3B is a bottom view of the microphone array device 81 shown in FIG. 3A as viewed from
below.
[0034]
In the microphone array device 81 shown in FIG. 3A, a plurality of microphone units 13 are
supported from the ceiling tube holding member 79 via the pipe 15 or the microphone cable 63,
dispersed in a concentric circle, and uniformly. It is arranged with a certain distance. The
ceilinged tube holding member 79 is formed, for example, in a flat disk shape, and is directly
fixed to the ceiling 33 by the ceiling fixing fitting 83. In the ceilinged tube holding member 79,
the relay board 39 and the microphone amplifier 55 described in FIG. 2B are accommodated. The
microphone unit 13 is suspended from the ceiling-mounted tube holding member 79 by the pipe
15 or the microphone cable 63. In the microphone array device 81 shown in FIG. 3A, the
plurality of microphone units 13 and the lower surface of the ceiling-mounted tube holding
member 79, that is, the vertically downward surface facing the ground (not shown) are parallel to
each other. The plurality of microphone units 13 are horizontally disposed on the same
horizontal plane.
[0035]
FIG. 4A is a side view of the microphone array device 85 in which the microphone units 13
suspended from the ceilinged tube holding member 79 are spherically arranged. FIG. 4B is a
bottom view of the microphone array device 85 shown in FIG. 4A as viewed from below.
[0036]
In the microphone array device 85 shown in FIG. 4A, the plurality of microphone units 13 are the
lower surface of the ceiling-mounted tube holding member 79, that is, the vertically downward
surface (for example, the center of the surface) facing the ground (not shown) It differs from the
microphone array device 81 shown in FIG. 3 (A) in that it is, for example, dispersedly disposed on
a convex virtual spherical surface 87 based on the position).
[0037]
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Specifically, in the microphone array device 85 shown in FIG. 4A, the plurality of microphone
units 13 are dispersed on a plurality of concentric circles having different outer diameters, and
are disposed with a uniform distance. Ru.
For example, in FIG. 4B, a total of 12 microphone units are disposed on the outermost concentric
circles, a total of 4 microphone units 13 are disposed on the inner concentric circles from the
outermost diameter, and One microphone unit 13 is arranged.
[0038]
The microphone units 13 arranged concentrically with the same diameter are arranged on the
same plane. Furthermore, the microphone units 13 arranged on the inner side (e.g. center) side
of the ceiling-mounted tube holding member 79 are suspended downward from the microphone
units 13 between the respective concentric circles. Thus, in the microphone array device 85
shown in FIG. 4A, the plurality of microphone units 13 are based on the lower surface of the
ceiling-mounted tube holding member 79, that is, the vertically downward surface facing the
ground (not shown). For example, they are distributed on a convex virtual spherical surface 87.
[0039]
As a result, the microphone array device 85 shown in FIG. 4A can improve the calculation
accuracy of the sound collection directivity using each microphone element 23 compared to the
microphone array device 81 shown in FIG. Sound pickup directivity can be formed.
[0040]
FIG. 5A is a cross-sectional view showing the manner in which the ceilinged tube holding
member 79 to which the cable 31 is directly fixed in FIG. 1 supports the microphone unit 13.
FIG. 5B is a cross-sectional view showing how the ceiling-mounted tube holding member 79 to
which the pipe 15 is fixed supports the microphone unit 13.
[0041]
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As shown in FIG. 5A, by using the cable fixing member 69, the ceilinged tube body holding
member 79 can directly support the microphone unit 13 via the microphone cable 63 containing
a tensile material.
[0042]
As shown in FIG. 5B, the ceilinged tube holding member 79 can screw the upper end of the pipe
15 to fix the microphone unit 13 to the lower end of the pipe 15.
In this case, the electric wire 25 connected to the microphone unit 13 is inserted through the
pipe 15.
[0043]
In addition to the circumferential direction, the microphone units 13 may be arranged in the XY
directions (orthogonal directions) on the horizontal surface, and can be, for example, a cross
array. Further, the arrangement of the microphone units 13 may be a lattice arrangement in
which the microphone units 13 are arranged at intersections of lattices, or a staggered
arrangement in which the vertical and horizontal directions of the lattice arrangement are
shifted.
[0044]
FIG. 6A is a side view of the microphone array device 89 designed to be a chandelier type in
which the microphone units 13 are arranged in a plane. FIG. 6B is a bottom view of the
microphone array device 89 shown in FIG. 6A as viewed from below.
[0045]
As shown in FIG. 6A, in the microphone array device 89, the ceiling attachment member 35 is
fixed to the ceiling 33, and the tube holding member 17 is suspended from the ceiling
attachment member 35 by the cable 31. A plurality of microphone units 13 are supported by the
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pipe holding member 17 via the pipe 15. The ceiling attachment member 35 has an interface 93
having a function of a communication control unit for controlling communication with an
external device connected via an A / D converter 91 (see FIG. 9A) and a network (not shown). Be
housed. Further, the tube holding member 17 houses a microphone amplifier 55 for amplifying
an audio signal. In the microphone array device 89 shown in FIG. 6A, a plurality of microphone
units 13 are arranged in a plane.
[0046]
FIG. 7A is a side view of the microphone array device 95 designed to be a chandelier type in
which the microphone units 13 are arranged spherically. FIG. 7B is a bottom view of the
microphone array device 95 shown in FIG. 7A as viewed from below.
[0047]
As shown in FIG. 7A, the microphone array device 95 has substantially the same configuration as
the microphone array device 89, and only the array of the microphone units 13 is sphericallyarranged in FIG. 6A. This is different from the microphone array device 89 shown.
[0048]
FIG. 8 is a side view of the microphone array apparatus 97 in which an interface 93 (see FIG. 9)
having a function as a network transmission unit is accommodated in the tube body holding
member 99. As shown in FIG.
[0049]
The microphone array device 97 shown in FIG. 8 has substantially the same configuration as the
microphone array device 89.
In the microphone array device 97 shown in FIG. 8, an A / D converter 91 (see FIG. 9B), a control
unit, and an interface 93 are accommodated in the tube holding member 99.
[0050]
According to the microphone array device 89, the microphone array device 95, and the
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microphone array device 97 described above, by providing the LED 45 in the microphone unit
13, it becomes possible to realize illumination or decoration (illumination), and a high aesthetic
decoration effect as an interior Is obtained.
[0051]
FIG. 9A shows a microphone array device in which the ceiling-mounted tube holding member 79
is provided with microphone amplifiers 55 and A / D converters as many as the number of
microphone elements 23, one control unit, and an interface. It is a block diagram which shows a
circuit structure.
FIG. 9B is a block diagram showing a circuit configuration of the microphone array device in
which the microphone amplifiers 55 equal in number to the number of microphone elements 23
are provided in the microphone unit 13.
FIG. 9C is a block diagram showing a circuit configuration of the microphone array device in
which the tube holding member 17 is provided with the same number of microphone amplifiers
55 as the number of microphone elements 23.
[0052]
The equivalent circuit applied to the microphone array apparatus according to each of the abovedescribed modified examples can be exemplified as one of the circuit configurations of FIGS. 9A
to 9C, for example. The circuit configuration of the microphone array device shown in FIG. 9 (A)
is adopted, for example, in the microphone array device 81 shown in FIG. 3 (A) or the
microphone array device 85 shown in FIG. 4 (A). The circuit configuration of the microphone
array device shown in FIG. 9B is adopted, for example, in the microphone array device using the
microphone unit 41, the microphone unit 47, and the like. The circuit configuration of the
microphone array device shown in FIG. 9C is adopted, for example, in the microphone array
device 11 shown in FIG. 1 or the microphone array device 89 shown in FIG.
[0053]
FIG. 10 is a side view of the microphone array device 101 designed in a candlestick type.
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[0054]
The microphone array device 101 has a holding stand 105 placed on the table 103.
The lower end of a plurality of pipes 15 extending upward is fixed to the upper end of the
holding table 105. The microphone unit 13 is fixed to the upper end of the pipe 15. The electric
wire 25 (see FIG. 2A) is inserted into the pipe 15. The holding stand 105 accommodates the
microphone amplifier 55 shown in FIG. 9A and an interface 93 having a function as a network
transmission unit. The microphone array device 101 picks up sound with the sound collection
space 19 above the holding stand 105.
[0055]
As described above, according to the microphone array device 101 shown in FIG. 10, by
providing the LED 45 (see FIG. 2C) to the microphone unit 13, it becomes possible to realize
illumination or decoration (illumination), and as an interior such as a candlestick High aesthetic
decoration effect is obtained.
[0056]
Therefore, according to the microphone array device according to the present embodiment or the
variation thereof, deterioration of acoustic characteristics can be suppressed, and even when the
microphone unit 13 is recognized as a microphone, the installation situation and appearance of
the microphone array device can be reduced. Even in consideration, no sense of incongruity or
mistrust is given to a third party.
[0057]
Hereinafter, configurations, operations and effects of the directivity control system and the audio
output control method according to the present invention described above will be described.
[0058]
In one embodiment of the present invention, a plurality of microphone units disposed in a
predetermined sound collection space and having a sound collection element housed in a
predetermined microphone holding portion, and one end portion being fixed to each of the
microphone units A plurality of acoustically transparent tubes and a sound collection space
disposed behind the microphone reception sound surface of the microphone unit, and the other
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end of each of the tubes is fixed to support the microphone unit And a holding unit.
[0059]
In the microphone array device 11 described above, the plurality of microphone units 13
disposed in the sound collection space 19 are disposed on the tube holding member 17 disposed
outside the sound collection space 29 via the acoustically transparent pipe 15. Be supported.
One end of the pipe 15 is fixed to the microphone unit 13, and the other end is fixed to the tube
holding member 17.
That is, the pipe 15 is disposed from the inside of the sound collection space 19 to the outside of
the sound collection space 29.
Since the microphone unit 13 is supported in the sound collection space 19 via the acoustically
transparent pipe 15, the generation of acoustic reflection by the pipe 15 can be suppressed.
That is, the microphone array device 11 has a configuration equivalent to a state in which only
the plurality of microphone units 13 are disposed in the sound collection space 19.
[0060]
Thereby, the microphone array device 11 is caused by the deterioration of the acoustic
characteristics of the collected voice due to the influence of the housing shape when the plural
microphones are collectively installed in a large housing, for example, the increase of the sound
pressure level and the use frequency It is possible to suppress the occurrence of peaks or valleys
of the amplitude, the phase lead, or the phase delay, and to reduce the deviation between the
actual measurement value and the theoretical value of the collected speech waveform.
[0061]
Moreover, one embodiment of the present invention is a microphone array device in which a
plurality of the microphone units are distributed and arranged in a convex virtual spherical
surface based on the holding unit.
03-05-2019
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[0062]
In the configuration described above, each microphone array device 11 is compared to the case
where the microphone units 13 are two-dimensionally arranged based on the lower surface of
the tube holding member 17, that is, the vertically downward surface facing the ground. The
calculation accuracy of the sound collection directivity using the microphone element 23 can be
improved, and the sound collection directivity can be easily formed.
[0063]
Moreover, one Embodiment of this invention is a microphone array apparatus in which an LED
light emitting element is provided in the said microphone holding part.
[0064]
In the configuration described above, the microphone array device 11 can use each microphone
unit 47 as illumination by lighting the LED 45 in each microphone unit 47, or the LEDs 45 in
each microphone unit 47 in a predetermined order or selectively By turning on the lamp, it
becomes possible to realize decoration (illumination) using each microphone unit 47, and a high
aesthetic decoration effect as an interior can be obtained.
[0065]
Moreover, one embodiment of the present invention is a microphone array device in which the
microphone holding unit is acoustically transparent.
[0066]
In the microphone array device 11 described above, in addition to the pipe 15, the size of the
microphone holder 21 is also acoustically transparent, that is, the outer diameter of the
microphone holder 21 is 10.6 mm or less, so the microphone holder 21 is also acoustically
transparent. It becomes.
In order to be acoustically transparent, the outer diameter of the microphone holder 21 needs to
correspond to the wavelength / 4 of the upper limit frequency of the sound waveform of the
sound collection target.
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[0067]
As a result, in the microphone array device 11, the pipe 15 and the microphone holder 21
become acoustically transparent, and therefore, the microphone array device 11 is equivalent to
the configuration in which only the microphone element 23 is disposed in the sound collecting
space 19. It is possible to suppress the occurrence of voice attenuation and to pick up voice with
high accuracy.
[0068]
Although various embodiments have been described above with reference to the drawings, it
goes without saying that the present invention is not limited to such examples.
It will be apparent to those skilled in the art that various changes or modifications can be
conceived within the scope of the appended claims, and of course these also fall within the
technical scope of the present invention. It is understood.
[0069]
Industrial Applicability The present invention is useful as a microphone array device that reduces
the size of the holding housing of the microphone and suppresses the deterioration of the
acoustic characteristics of the sound collected in the sound collection space.
[0070]
11 microphone array device 13 microphone unit 15 pipe 17 tube holding member 19 sound
collecting space 21 microphone holder 23 microphone element 27 microphone reception sound
surface 29 sound collecting space external 31 cable 45 LED 87 virtual spherical surface
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