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JP2014236347

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2014236347
Abstract: Even when the housings of a camera device and a microphone device are integrally or
separately disposed, deterioration of acoustic characteristics of an audio signal collected in a
sound collecting space is suppressed. A sound pickup system (11) has a disk-shaped
omnidirectional camera device (13) and an annular microphone housing (25) concentrically
disposed with the camera device inserted in an inner circumferential space (23). And a
microphone array device 15 in which a plurality of microphone units 17 are arranged
concentrically in the inside of the space 25. In the sound collection system 11, an air gap 19
communicating with the hole 29 provided in the installation surface is formed between the
installation surface to which the annular microphone housing 25 is attached and the
omnidirectional camera device 13 fitted in the inner circumferential space 23. Ru. [Selected
figure] Figure 2
Sound pickup system
[0001]
The present invention relates to a sound collection system including a microphone array device
that collects sound in a predetermined sound collection space using a plurality of microphones.
[0002]
Conventionally, in a surveillance system installed at a predetermined position (for example, a
ceiling) at a factory, a store (for example, a retail store, a bank) or a public place (for example, a
library), a plurality of camera devices (for example, pan and tilt camera devices or all) By
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connecting the azimuth camera device, video data (still image and moving image) of a
predetermined range of the monitoring target is included.
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.
[0004]
Here, there is known a control device that controls each operation of a camera device and a
microphone array device to obtain audio data in a direction in which the camera device captures
an image (see, for example, Patent Document 1).
The control device shown in Patent Document 1 is installed in, for example, a conference room
where a video conference system can be used, and includes a camera device operable in the leftright direction (pan direction) and a microphone array device capable of changing a sound
collection range. Control the operation.
[0005]
The control device disclosed in Patent Document 1 includes a distance between a position of a
camera device and a position of an object to be captured in an image acquired by the camera
device, a pan direction of the camera device, a position of the camera device, and a microphone
array device. The sound collection range of the microphone array device is changed using the
distance between the positions and the direction of the position of the microphone array device
with reference to the position of the camera device.
[0006]
JP, 2012-186551, A
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[0007]
However, in Patent Document 1, only the usage form in the case where the housings of the
camera device and the microphone array device are separately disposed at separate positions is
assumed, and the housings of the camera device and the microphone array device are assumed.
It is considered that the usage form when the body is integrally disposed is not assumed.
[0008]
For this reason, in the case where the respective housings of the camera device and the
microphone array device are integrally disposed and in the case where they are separately
disposed, of the audio signal collected by the microphone array device disposed in the
predetermined sound collecting space, There is a problem that the acoustic characteristics are
different, and the convenience at the time of installation of the sound collection system including
the camera device and the microphone array device is low.
[0009]
Therefore, it is conceivable to arrange them side by side because they are not integrally installed,
but in such an arrangement, the camera device becomes an obstacle when the microphone array
device picks up sound, and Unlike the sound from the other direction, the acoustic characteristic
of the sound coming from the direction degrades the accuracy of the directivity formed by the
microphone array device.
In addition, when the camera device is installed on the microphone array device, although the
change due to the direction decreases, the protrusion of the camera device becomes large, so that
directivity synthesis (beamforming) by signal processing in the microphone array device can be
performed. There is a problem that the accuracy is deteriorated and the convenience at the time
of installation is low.
[0010]
According to the present invention, in order to solve the above-described conventional problems,
even when the housings of the camera device and the microphone array device are integrally
disposed, or even when separately disposed at separate positions, a predetermined sound
collecting space is provided. It is an object of the present invention to provide a sound collection
system which suppresses the deterioration of the acoustic characteristics of the sound signal
collected inside and improves the convenience when installing the camera device and the
microphone array device.
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[0011]
According to the present invention, there is provided a camera device, and a microphone device
having a concentric annular microphone housing in which the camera device is fitted in an inner
circumferential space, and in which the plurality of microphones are arranged concentrically in
the annular microphone housing. It is a sound collection system equipped.
[0012]
Further, the present invention has a camera device and a concentric disk-like microphone
housing in which the camera device is fitted in a central recess, and the microphone device in
which a plurality of microphones are arranged concentrically in the disk-like microphone
housing And a sound collecting system.
[0013]
Further, according to the present invention, there is provided a camera device, and a microphone
device having a concentric annular microphone housing for fitting the camera device in the inner
circumferential space, and a plurality of microphones are arranged concentrically in the annular
microphone housing. , And the microphone device constitutes a part of the annular microphone
housing, and has a rotational center perpendicular to an installation surface to which the annular
microphone housing is attached, with respect to the annular microphone housing main body
excluding the part It is a sound collection system which has a microphone case door part opened
and closed.
[0014]
Furthermore, the present invention has an arc-shaped microphone housing in which an annular
shape surrounding the camera device is circumferentially separated along the outer periphery of
the camera device, and a plurality of microphones are arc-shaped in the arc-shaped microphone
housing. The microphone device is a sound collection system, wherein a plurality of different
types of function-specific circuit boards are disposed in the arc microphone housing along the
outer circumference of the camera device. .
[0015]
According to the present invention, even when the housings of the camera device and the
microphone device are integrally disposed or separately disposed at separate positions, the
sound of the audio signal collected in the predetermined sound collecting space is obtained.
Deterioration of the characteristics can be suppressed, and convenience at the time of installation
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of the camera device and the microphone device can be improved.
[0016]
(A) A perspective view of the sound collection system according to the first embodiment, (B) an
exploded perspective view of the sound collection system shown in FIG. 1 (A) (A) The sound
collection system shown in FIG. A plan view, (B) a-a sectional view of FIG. 2 (A) a sectional view of
the sound collection system according to the second embodiment (A) a perspective view of the
sound collection system shown in FIG. 3 (B) FIG. The top view of the microphone board shown to
(A) The top view of the sound collection system of 3rd Embodiment, (B) The top view of the
sound collection system with the microphone case door part opened The microphone case door
part was opened A perspective view of a sound collection system (A) A perspective view of a
sound collection system according to the fourth embodiment, (B) A perspective view of one unit
housing shown in FIG. 7 (A) (A) A main unit attached to a wall And a perspective view of the
subunit, (B) a perspective view of the main unit attached to the inside corner (A) Is a plan view of
the inner side of the plurality of arc-shaped microphone housings in which the housing is
accommodated, (B) a cross-sectional view taken along the line bb shown in FIG. 9A (A) resembles
a part of the disk-shaped housing of the omnidirectional camera device (B) A sectional view of
the omnidirectional camera device pseudo lid shown in FIG. 10A and the annular microphone
case shown in FIG. FIG. 11B is a perspective view of an annular microphone case with a flat lid
attached, FIG. 11B is a cross-sectional view of the flat lid and the annular microphone case shown
in FIG. FIG. 12B is a perspective view of the body, and FIG. 12A is a cross-sectional view of the
annular microphone case and the sound absorbing material.
[0017]
Hereinafter, embodiments of the sound collection system according to the present invention will
be described with reference to the drawings.
[0018]
First Embodiment First, a sound collection system 11 according to a first embodiment will be
described with reference to FIGS. 1 (A), 1 (B), 2 (A) and 2 (B). .
FIG. 1A is a perspective view of the sound collection system 11 according to the first
embodiment.
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FIG. 1 (B) is an exploded perspective view of the sound collection system 11 shown in FIG. 1 (A).
FIG. 2A is a plan view of the sound collection system 11 shown in FIG. 1 as viewed from below in
the vertical direction.
FIG. 2B is a cross-sectional view taken along the line aa of FIG.
[0019]
The sound collection system 11 of the present embodiment includes an omnidirectional camera
device 13 as an example of a camera device and a microphone array device 15 as an example of
a microphone device, and is installed in a predetermined sound collection space.
In each of the following embodiments, the predetermined sound collection space is, for example,
a designated room of a store or a library.
[0020]
The omnidirectional camera device 13 has a disk-shaped housing formed in a disk shape.
The omnidirectional camera device 13 is provided with a fisheye lens 21 for condensing incident
light in all directions on the imaging device so as to project from a recessed position of the
central portion of the disk-like housing.
[0021]
The microphone array device 15 has a concentric toroidal annular microphone housing 25 into
which the disk-shaped housing of the omnidirectional camera device 13 is fitted in the inner
circumferential space 23.
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A plurality of (for example, sixteen) microphone units 17 are concentrically arranged inside the
annular microphone housing 25.
As the microphone unit 17, for example, a high-quality compact electret condenser microphone
(ECM: Electret Condenser Microphone) 17a is used, and the same applies to each of the following
embodiments.
[0022]
There is a difference in level between the upper surface (for example, the surface to which the
microphone unit 17 is attached) of the annular microphone housing 25 of the microphone array
device 15 and the upper surface (for example, the surface with the fisheye lens 21) of the disk
shaped housing of the omnidirectional camera device 13 There is no positional relationship (for
example, a horizontal surface or a continuous curved surface close to the horizontal surface), and
no factor causing deterioration of acoustic characteristics such as reflection of sound is
generated, and the same applies to each of the following embodiments. is there.
[0023]
In addition, an air gap of a predetermined volume is provided between the ceiling surface 27 as
an example of the installation surface to which the annular microphone housing 25 is directly
attached and the disk-shaped housing of the omnidirectional camera device 13 fitted in the inner
peripheral space 23. 19 are formed (see FIG. 2 (B)).
The air gap 19 leads to a hole 29 provided in the ceiling surface 27.
[0024]
In the sound collection system 11 of the present embodiment, the microphone array device 15 is
attached, for example, at a position suspended from the ceiling surface 27 or the ceiling in the
vertical direction of a predetermined length.
The omnidirectional camera device 13 and the microphone array device 15 are connected via a
network (not shown) to a host computer installed in a central control room separated from the
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sound collection space.
Therefore, in the host computer, the image signal picked up by the omnidirectional camera
device 13 and the individual microphone units 17 pick up sound, and the microphone array
device 15 performs predetermined sound processing (for example, amplification processing of
volume level, sound collection direction The voice signal subjected to the directivity control
process, the voice signal selection process or the synthesis process) is transmitted.
Electrical wiring for configuring the network is routed, for example, on the back of a ceiling or a
wall.
[0025]
In the sound collection system 11 of the present embodiment, the disk-shaped casing of the
omnidirectional camera device 13 is fitted so as to fill the inner peripheral space 23 of the
annular microphone casing 25. The microphone array device 15 operates independently of the
omnidirectional camera device 13.
[0026]
For example, a case is considered in which the omnidirectional camera device 13 and a separate
microphone array device having a different configuration from the microphone array device 15
of the present embodiment are attached in a non-concentric arrangement state. In this case,
when the omnidirectional camera device 13 and the separate microphone array device are
attached, the acoustic characteristics of the sound signals collected by the individual
microphones provided in the separate microphone array device are different from the
omnidirectional camera device 13 and the individual. In accordance with the difference in
relative position between the microphone and the microphone, the characteristic (accuracy) of
the directivity changes depending on the direction of the sound source because it is not uniform.
[0027]
On the other hand, in the sound collection system 11 of the present embodiment, by using the
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microphone array device 15, the disk-shaped casing of the omnidirectional camera device 13 is
fitted so as to fill the inner circumferential space 23. The relative positions between the
microphone unit 17 and the omnidirectional camera device 13 become equal. As a result, the
acoustic characteristics of the sound signals collected by the individual microphone units 17 of
the microphone array device 15 become uniform, and the directivity characteristics (accuracy) in
all directions become equal.
[0028]
In addition, an air gap 19 is formed on the back surface side of the omnidirectional camera
device 13 fitted so as to fill the inner peripheral space 23 of the annular microphone housing 25,
that is, the upper surface side facing the ceiling surface 27. The air gap 19 communicates with
the hole 29 formed in the ceiling surface 27.
[0029]
Thereby, the sound collection system 11 of the present embodiment can dissipate the heat from
the upper surface side of the omnidirectional camera device 13 to the air gap 19, and is
discharged from the air gap 19 through the hole 29 to the back side of the ceiling surface 27. It
can heat up. In addition, when the sound collection system 11 is attached at the position
suspended from the ceiling, the exhaust heat is directly performed from the inner circumferential
space 23.
[0030]
As described above, the sound collection system 11 of the present embodiment has an effect that
the heat radiation characteristics of the omnidirectional camera device 13 are excellent, and the
casings of the omnidirectional camera device 13 and the microphone array device 15 are
integrally arranged. Even in the case where they are separately disposed at separate positions,
deterioration of the acoustic characteristics of the sound signal collected in the predetermined
sound collection space can be suppressed, and omnidirectional camera device 13 and
microphone array device 15 The convenience at the time of installation of can be improved.
[0031]
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The omnidirectional camera device 13 illustrated in the present embodiment is, for example, a
disk-shaped omnidirectional camera device 13, but it is a hemispherical transparent dome having
a pan direction rotation, a tilt direction rotation, and a zoom function. It may be a camera device
having a shape.
Even in this case, the directivity characteristics (accuracy) in all directions (for example, 360 °)
are equal. Furthermore, depending on the sound source position, the microphone array device 15
propagates the sound wave by diffraction even if there is a microphone that is acoustically
shadowed by the transparent dome shape, so that the directivity synthesis is performed by
correcting the propagation time. You can reduce the impact on
[0032]
Second Embodiment Next, a sound collection system 31 according to a second embodiment will
be described with reference to FIG. 3, FIG. 4 (A) and FIG. 4 (B). FIG. 3 is a cross-sectional view of
the sound collection system 31 of the second embodiment. FIG. 4A is a perspective view of the
sound collection system 31 shown in FIG. FIG. 4B is a plan view of the microphone substrate 33
shown in FIG. In the following embodiments, the same members as the members shown in FIG. 1
and FIG. 2 are given the same reference numerals, and overlapping descriptions will be omitted
or simplified.
[0033]
The sound collection system 31 of the present embodiment includes a disk-shaped
omnidirectional camera device 13 as an example of a camera device, and a microphone array
device 39 as an example of a microphone device, and is installed in a predetermined sound
collection space .
[0034]
The microphone array device 39 has a concentric dish-like disk-shaped microphone housing 37
into which the disk-shaped housing of the omnidirectional camera device 13 is fitted in the
central recess 35.
Inside the disk-shaped microphone housing 37, a plurality of (for example, sixteen) microphone
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units 17 are arranged concentrically.
[0035]
Further, the microphone array device 39 is bored at both ends of the disk-shaped microphone
housing 37, and the disk 29 and the hole 29 provided in the ceiling surface 27 as an example of
an installation surface to which the disk-shaped microphone housing 37 is attached And an air
vent 41 for communicating with the outside of the case 37. The vent hole 41 may be provided
only at one end of the disk-shaped microphone housing 37. In the microphone unit 17, the
rubber bush 43 is sandwiched and the ECM 17a is fixed.
[0036]
In the sound collection system 31 of the present embodiment, the microphone array device 39 is
attached, for example, at a position suspended from the ceiling surface 27 or the ceiling in the
vertical direction of a predetermined length.
[0037]
In the sound collection system 31 of the present embodiment, the microphone array device 39
has a disk-shaped microphone housing 37.
The disk-like microphone case 37 can be referred to as a pro-tome turtle-like case or a dish-like
case. Unlike the annular microphone case 25 of the first embodiment, the disk-like microphone
case 37 has a longer space than the diameter of the omnidirectional camera device 13 in the inhousing space 45 formed in the upper part of the omnidirectional camera device 13. A circular
or square microphone substrate 33 having a diameter of about 10 mm can be disposed.
[0038]
In addition, the disk-like microphone housing 37 can secure a large area of the ground 47 (GND)
of the microphone substrate 33 using the housing internal space 45. The microphone substrate
33 is provided with a control unit 49 (for example, a processor) on the surface facing the hole
29. The processor is, for example, a central processing unit (CPU), a micro processing unit (MPU),
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or a digital signal processor (DSP). The ground 47 may be planar or linear.
[0039]
Thus, the sound collection system 31 of the present embodiment has the heat radiation
characteristics, the noise radiation resistance characteristics (EMI: Electro Magnetic Interference),
and the noise immunity failure characteristics (EMS: Electro Magnetic Susceptibility) from the
microphone substrate 33 of the microphone array device 39. It can improve. Further, the disklike microphone housing 37 enables the AD converter 53 to be disposed in the vicinity of the
connector 51 as an example of the microphone attachment portion.
[0040]
In the sound collection system 31 of the present embodiment, a circular or square substrate
having a diameter equal to or greater than the diameter of the disk-shaped housing of the
omnidirectional camera device 13 is accommodated in the disk-shaped microphone housing 37
concentrically. A plurality of signal lines 56 are radially formed equidistant from the central
portion of the substrate. The signal line 56 connects, for example, a control unit disposed in the
center of the substrate, the AD converter 53, and the connector 51.
[0041]
Since the disk-shaped microphone housing 37 can secure a large area of the microphone
substrate 33, it can be disposed close to the microphone unit 17, the microphone cable 55 can
be shortened, and noise immunity failure characteristics (EMS) can be improved.
[0042]
Therefore, the sound collection system 31 of the present embodiment can improve the heat
dissipation characteristic and the noise resistance characteristic of the microphone array device
39.
[0043]
Further, in the sound collection system 31 of the present embodiment, for example, when the
control unit 49 (for example, processor) is disposed at the central portion of the microphone
substrate 33, the signal lines 56 provided around it become equal in length and the signal after
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sample processing Transmission time difference can be reduced equally.
[0044]
Thereby, the sound collection system 31 of this embodiment can reduce the sampling error at
the time of AD conversion of the sound which each microphone unit 17 of the microphone array
apparatus 39 collected.
Furthermore, in the sound collection system 31 of the present embodiment, even when the
respective housings of the omnidirectional camera device 13 and the microphone array device
39 are integrally disposed, even when they are separately disposed at separate positions,
predetermined collection is achieved. Deterioration of the acoustic characteristics of the sound
signal collected in the sound space can be suppressed, and convenience at the time of installation
of the omnidirectional camera device 13 and the microphone array device 39 can be improved.
[0045]
Third Embodiment Next, a sound collection system 57 according to a third embodiment will be
described with reference to FIGS. 5 (A), 5 (B) and 6.
FIG. 5A is a plan view of the sound collection system 57 of the third embodiment.
FIG. 5B is a plan view of the sound collection system 57 in which the microphone housing door
59 is opened. FIG. 6 is a perspective view of the sound collection system 57 in which the
microphone housing door 59 is opened.
[0046]
The sound collection system 57 of the present embodiment includes a disk-shaped
omnidirectional camera device 13 as an example of a camera device, and a microphone array
device 63 as an example of a microphone device, and is installed in a predetermined sound
collection space. .
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[0047]
The microphone array device 63 has a concentric donut-shaped annular microphone housing 61
in which the disk-shaped housing of the omnidirectional camera device 13 is fitted in the inner
circumferential space 23.
Inside the annular microphone housing 61, a plurality of (for example, sixteen) microphone units
17 are arranged concentrically. In addition, the microphone array device 63 constitutes a part of
the annular microphone housing 61, and a part of the annular microphone housing 61 at a
rotation center perpendicular to the ceiling surface 27 as an example of an installation surface to
which the annular microphone housing 61 is attached. The microphone housing door 59 is
opened and closed with respect to the annular microphone housing main body 65 excluding the
above.
[0048]
In the sound collection system 57 of the present embodiment, the microphone array device 63 is
attached, for example, at a position suspended from the ceiling surface 27 or the ceiling in the
vertical direction of a predetermined length.
[0049]
In the sound collection system 57 of the present embodiment, the microphone array device 63
externally receives image data captured by the omnidirectional camera device 13 inside the
annular microphone case main body 65 or inside the microphone case door 59. A camera SD
card storage unit 67 for storing a camera SD card for removal, a microphone SD card storage
unit 69 for storing a microphone SD card for removing audio data collected by the microphone
array device 63, a microphone array device 63 It becomes possible to install the USB port 71 for
the USB, the DC jack 73 for the microphone array device 63, and the like.
Thereby, the sound collection system 57 of this embodiment can simplify the maintenance work
of the user, such as being able to easily take out the camera SD card or the microphone SD card.
[0050]
As described above, in the sound collection system 57 of the present embodiment, even when the
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casings of the omnidirectional camera device 13 and the microphone array device 63 are
integrally disposed, even when separately disposed at separate positions as predetermined
bodies, It is possible to suppress deterioration of the acoustic characteristics of the sound signal
collected in the sound collection space, and improve the convenience of the user at the time of
installation and maintenance of the omnidirectional camera device 13 and the microphone array
device 63. it can.
[0051]
Fourth Embodiment Next, a sound collection system 75 according to a fourth embodiment will be
described with reference to FIGS. 7 (A), 7 (B), 8 (A) and 8 (B). explain.
FIG. 7A is a perspective view of the sound collection system 75 of the fourth embodiment. FIG. 7
(B) is a perspective view of one unit housing 77 shown in FIG. 7 (A). FIG. 8A is a perspective view
of the main unit 79 and the sub unit 81 attached to the wall surface. FIG. 8B is a perspective view
of the main unit 79 attached to the inside corner 83.
[0052]
The sound collection system 75 of this embodiment has an annular shape surrounding the diskshaped casing of the omnidirectional camera device 13 in the circumferential direction along the
outer periphery of the disk-shaped omnidirectional camera device 13 (not shown in FIG. 7) A
microphone array device 85 having one or more unit housings 77 as a circular arc microphone
housing formed separately is installed in a predetermined sound collecting space. In the
microphone array device 85, a plurality of (for example, 16) microphone units 17 are disposed
along a circular arc inside the unit housing 77.
[0053]
In the sound collection system 75 of the present embodiment, an arc-shaped microphone
housing is formed in which an annular housing surrounding the omnidirectional camera device
13 is separated into two or more in the circumferential direction. The minimum unit of the arcshaped microphone housing separated is the unit housing 77. In the unit casing 77, the
microphone substrate 33, the control substrate 87, and the power supply substrate 89 are
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provided internally, or only the microphone substrate 33 is provided internally. The former
configuration is the main unit 79, and the latter configuration is the sub unit 81.
[0054]
The arc-shaped microphone casing is, for example, a semicircular casing using two unit casings
77, a quarter circle shape using one unit casing 77, according to the number of unit casings 77.
It can be assembled as a three-quarter circle-shaped casing using the three casings 77. That is,
the microphone array device 85 is rearranged into a semicircle, a quarter circle, a quarter circle,
etc., and the wall surface 91 shown in FIG. (Not shown) can be installed.
[0055]
As described above, in the sound collection system 75 of the present embodiment, even when the
casings of the omnidirectional camera device 13 and the microphone array device 85 are
integrally disposed, even when separately disposed at separate positions as predetermined
bodies, Deterioration of the acoustic characteristics of the sound signal collected in the sound
collection space can be suppressed, and convenience at the time of installation of the
omnidirectional camera device 13 and the microphone array device 85 can be improved. It is
possible to reduce the installation cost by separating it into the optimal size
[0056]
(Modified example) Next, about the modified example of the sound collection system of 1st-4th
each embodiment mentioned above, FIG. 9 (A), FIG. 9 (B), FIG. 10 (A), FIG. 10 (B) 11 (A), 11 (B),
12 (A) and 12 (B).
[0057]
FIG. 9A is a plan view of the inside of the plurality of arc-shaped microphone housings in which
the function-specific circuit boards 93 are accommodated.
FIG. 9B is a cross-sectional view taken along line b-b of FIG.
[0058]
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The sound collection system 11 of the first embodiment and the sound collection system 75 of
the fourth embodiment are arranged along the outer periphery of the disk-shaped casing of the
omnidirectional camera device 13 (not shown in FIG. 9A). Different types of function-specific
circuit boards 93 may be disposed.
The annular microphone housings 25 of the microphone array device 15 or the function-specific
circuit boards 93 accommodated in the respective unit housings 77 are connected by the board
connection connector 95.
[0059]
For example, the function-specific circuit board 93 of the analog circuit unit 97 is accommodated
inside the unit case 77 shown in FIG. 9B, and the function-specific circuit board 93 is closed by
the back cover 99. An AD converter 53, an analog amplifier 101, a connector 51, and the like are
mounted on the function-specific circuit board 93 of the analog circuit unit 97. The microphone
cable 55 connects the connector 51 and the ECM 17 a fixed by the rubber bush 43. Thus, the
sound collection system 103 is configured.
[0060]
Further, FIG. 9B shows a cross-sectional view of the unit casing 77 in which the function-specific
circuit board 93 of the analog circuit section 97 is accommodated, but the function-specific
circuit of the digital circuit section 105 and the power supply circuit section 107, for example
Also in the unit housing 77 in which the substrate 93 is accommodated, necessary circuit
components are mounted on each circuit section.
[0061]
In the sound collection system 103 shown in FIG. 9, for example, when the housing of the
microphone array device constituting the sound collection system 103 is a unit housing 77, the
unit housing 77 includes an analog circuit unit 97, a digital circuit unit 105, The microphone unit
including only the power supply circuit unit 107 and the microphone unit 17 can be separated
and installed.
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That is, in the sound collection system 103, it is possible to arrange the small-sized different
types of function-specific circuit boards 93 in the circumferential direction. As a result, the sound
collection system 103 operates the function-specific circuit boards 93 according to functions
(analog, digital, power block distinction), and the boards are less susceptible to each other's
noise.
[0062]
The unit housing 77 may be provided with an individual electromagnetic shield 109 for each
block in which the function-specific circuit board 93 is disposed.
[0063]
Note that functional circuit boards 93 of different types may be provided in the circumferential
direction also for the annular microphone housing 25 of the microphone array device 15 of the
sound collection system 11 of the first embodiment described above.
[0064]
Moreover, in the sound collection system 103, it can respond by increasing the same shape, the
same components, and a mounting board according to the number of microphone units 17. (For
example, it respond | corresponds to 1/4 size, 1/3 size, 1/2 size etc.) And cost reduction is
possible.
Further, when two or more separated unit casings 77 are connected, only one side (1/2 size) of
the whole casing is taken as the main unit 79 shown in FIG. By doing this, only the number of
connected microphone units 17 can be changed.
[0065]
As described above, in the sound collection system 103 shown in FIG. 9, the substrates disposed
inside the individual unit casings 77 are less susceptible to each other's noise, and noise
resistance performance can be improved.
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In addition, cost reduction can be achieved.
[0066]
FIG. 10A is a perspective view of the annular microphone housing 25 to which an
omnidirectional camera device pseudo lid 115 is attached which is made to resemble the lower
side portion of the disk shaped housing of the omnidirectional camera device 13. FIG. 10B is a
cross-sectional view of omnidirectional camera device pseudo lid 115 and annular microphone
housing 25 shown in FIG. 10A. FIG. 11A is a perspective view of the annular microphone housing
25 to which a flat lid 121 flush with the microphone unit 17 is attached. FIG. 11B is a crosssectional view of the flat lid 121 and the annular microphone housing 25 shown in FIG. FIG. 12A
is a perspective view of an annular microphone case 25 to which a sound absorbing material 111
is attached as an example of a lid. FIG. 12 (B) is a cross-sectional view of the annular microphone
case 25 and the sound absorbing material 111 shown in FIG. 12 (A).
[0067]
The sound collection system 113 may have, for example, an omnidirectional camera device
pseudo lid 115 shown in FIG. 10 (B) as a lid replacing the omnidirectional camera device 13.
[0068]
That is, in the sound collection system 113 shown in FIG. 10 (B), the omnidirectional camera
apparatus pseudo lid 115 having the same shape as the lower part of the disk-shaped casing of
the omnidirectional camera apparatus 13 is replaced with the omnidirectional camera apparatus
13 Is attached.
[0069]
When the omnidirectional camera device 13 is not attached to the inner circumferential space 23
or the central recess 35, the inner circumferential space 23 or the central recess 35 becomes a
cavity, so the reflected wave in the cavity and the sound wave collected by the microphone unit
17 It may interfere.
Therefore, the acoustic characteristics deteriorate in the case where the omnidirectional camera
device 13 is not attached and in the case where the omnidirectional camera device 13 is
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attached.
[0070]
In the sound collection system 113 shown in FIG. 10 (B), the omnidirectional camera device
pseudo lid 115 as an example of a lid is provided in the inner circumferential space 23 or the
central recess 35 so that generation of a reflected wave due to a cavity does not occur. There is.
As a result, the sound collection system 113 can make the acoustic characteristics the same
between the omnidirectional camera device 13 and the sound collection system 11 integrated
with the omnidirectional camera device 13 and the sound collection system 11 separate from the
omnidirectional camera device 13. The omnidirectional camera device pseudo lid 115 is fixed by
a lid fixing bracket 119 attached to the mounting bracket 117 of the annular microphone
housing 25.
[0071]
In addition, the sound collection system 113 may have, for example, a flat cover 121 shown in
FIG. 11B or a sound absorbing material 111 shown in FIG. 12B as a cover in place of the
omnidirectional camera device 13.
[0072]
For example, in FIG. 11B, even if a perfect plane is realized by the flat lid 121, the deterioration
of acoustic characteristics is suppressed.
[0073]
Furthermore, in FIG. 12B, deterioration of acoustic characteristics is suppressed also by filling the
sound absorbing material (for example, open-cell sponge) 111 as an example of a lid in the inner
circumferential space 23 or the central recess 35.
In the case of the sound absorbing material 111, the sound absorbing material fixing bracket
123 attached to the mounting bracket 117 of the annular microphone case 25 can be attached to
the annular microphone case 25.
03-05-2019
20
[0074]
The sound collection system 113 shown in FIG. 12B can improve not only the reflection by the
inner circumferential space 23 or the wall surface of the central recess 35 but also the baffle
effect, thereby improving the acoustic characteristics.
[0075]
Therefore, according to the sound collection system 11, the sound collection system 31, the
sound collection system 57, and the sound collection system 75 of each embodiment and its
modification described above, the omnidirectional camera device 13 and the microphone array
device are integrally or separately provided. Also in the case of the arrangement in the above, it
is possible to suppress the deterioration of the acoustic characteristics of the sound signal
collected in the predetermined sound collection space.
[0076]
Hereinafter, the configuration, operation, and effects of the above-described sound collection
system according to the present invention will be described.
[0077]
One embodiment of the present invention has a camera device and a concentric annular
microphone housing for fitting the camera device in the inner circumferential space, and a
microphone in which a plurality of microphones are arranged concentrically in the annular
microphone housing And a device.
[0078]
In one embodiment of the present invention, the camera device has a disk-shaped housing.
[0079]
In one embodiment of the present invention, a space communicating with a hole provided in the
installation surface is formed between the installation surface to which the annular microphone
housing is attached and the camera device inserted into the inner circumferential space. Is a
sound collection system.
[0080]
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21
In the configuration described above, since the disk-shaped omnidirectional camera device 13 is
fitted in the inner peripheral space 23 of the annular microphone housing 25, the
omnidirectional camera device 13 and the microphone array device 15 are concentrically
attached.
The microphone array device 15 operates independently of the omnidirectional camera device
13.
[0081]
For example, it is assumed that the omnidirectional camera device 13 and a separate microphone
device having a configuration different from that of the microphone array device 15 having a
plurality of microphone units 17 are attached in a non-concentric arrangement state.
In this case, when the omnidirectional camera device 13 and the separate microphone array
device are attached, the acoustic characteristics of the sound signals collected by the individual
microphones provided in the separate microphone array device are different from the
omnidirectional camera device 13 and the individual. In accordance with the difference in
relative position between the microphone and the microphone, the characteristic (accuracy) of
the directivity changes depending on the direction of the sound source because it is not uniform.
[0082]
On the other hand, in the sound collection system 11 of the present embodiment, by using the
microphone array device 15, the disk-shaped casing of the omnidirectional camera device 13 is
fitted so as to fill the inner circumferential space 23. The relative positions between the
microphone unit 17 and the omnidirectional camera device 13 become equal.
As a result, the acoustic characteristics of the sound signals collected by the individual
microphone units 17 of the microphone array device 15 become uniform, and the directivity
characteristics (accuracy) in all directions become equal.
03-05-2019
22
[0083]
In addition, an air gap 19 is formed on the back surface side of the omnidirectional camera
device 13 fitted so as to fill the inner peripheral space 23 of the annular microphone housing 25,
that is, the upper surface side facing the ceiling surface 27 as an example of the installation
surface. Be done.
The air gap 19 communicates with the hole formed in the ceiling surface 27.
Thereby, the sound collection system 11 of the present embodiment can dissipate the heat from
the upper surface side of the omnidirectional camera device 13 to the air gap 19, and is
discharged from the air gap 19 through the hole 29 to the back side of the ceiling surface 27. It
can heat up.
[0084]
Moreover, one embodiment of the present invention has a camera device and a concentric disklike microphone housing in which the camera device is fitted in a central recess, and a plurality
of microphones are arranged concentrically in the disk-shaped microphone housing And a
microphone device.
[0085]
In one embodiment of the present invention, the camera device has a disk-shaped housing.
[0086]
In one embodiment of the present invention, the microphone device is formed in the disk-like
microphone housing, and a hole provided in an installation surface to which the disk-like
microphone housing is attached and the disk-like microphone housing It is a sound collection
system which further has a vent hole made to communicate with the case exterior.
[0087]
In the configuration described above, the microphone array device 39 of the sound collection
03-05-2019
23
system 31 has the disk-like microphone housing 37.
The disk-like microphone case 37 can be referred to as a pro-tome turtle-like case or a dish-like
case.
In the disk-shaped microphone housing 37, unlike the annular microphone housing 25, the
microphone substrate 33 can be disposed in the space in the housing formed on the upper part
of the omnidirectional camera device 13.
[0088]
Further, the disk-like microphone housing 37 can secure a large area of the ground 47 of the
microphone substrate 33 by utilizing the housing internal space 45.
As a result, the sound collection system 31 can improve the heat radiation characteristic from the
microphone substrate 33, the noise resistance characteristic (EMI), and the noise resistance
characteristic (EMS).
Further, in the disk-like microphone housing 37, the AD converter 53 can be disposed in the
vicinity of the connector 51 as a microphone attachment portion.
Since the disk-shaped microphone housing 37 can secure a large area of the microphone
substrate 33, it can be disposed close to the microphone unit 17, the length of the microphone
cable 55 can be shortened, and the noise immunity characteristic (EMS) is improved. it can.
[0089]
In one embodiment of the present invention, a camera device and a concentric annular
microphone housing for fitting the camera device in the inner circumferential space are provided,
and a plurality of microphones are arranged concentrically in the annular microphone housing. A
microphone device, wherein the microphone device constitutes a part of the annular microphone
housing, and the annular microphone housing excluding the part at a rotation center
perpendicular to an installation surface to which the annular microphone housing is attached It is
a sound collection system which further has a microphone case door part opened and closed to a
03-05-2019
24
main part.
[0090]
In one embodiment of the present invention, the camera device has a disk-shaped housing.
[0091]
According to the above-described configuration, the microphone array device 63 of the sound
collection system 57 has the image data captured by the omnidirectional camera device 13 inside
the annular microphone case main body 65 or inside the microphone case door 59. Camera SD
card storage unit for storing a camera SD card for extraction to the outside, Microphone SD card
storage unit for storing a microphone SD card for extraction to the outside of audio data
collected by the microphone array device 63, Microphone array device 63 It becomes possible to
install the USB port 71 for the USB, the DC jack 73 for the microphone array device 63, and the
like.
Thereby, the sound collection system 57 can improve the convenience of the omnidirectional
camera device 13 or the microphone array device 63.
[0092]
Further, an embodiment of the present invention has an arc-shaped microphone housing in
which an annular shape surrounding the camera device is separated in a circumferential
direction along the outer periphery of the camera device, and a plurality of arc-shaped
microphone housings are provided. A microphone device having a microphone disposed along a
circular arc, the microphone device including a plurality of different types of function-specific
circuit boards disposed in the circular arc microphone housing along an outer periphery of the
camera device; It is a sound system.
[0093]
In one embodiment of the present invention, the camera device has a disk-shaped housing.
[0094]
03-05-2019
25
According to the above-described configuration, in the sound collection system 75, the unit
housing 77 which is an arc-shaped microphone housing in which an annular housing
surrounding the omnidirectional camera device 13 is divided into two or more in the
circumferential direction is It is formed.
The unit housing 77 is an arc-shaped microphone housing of the separated minimum unit.
In the unit casing 77, the microphone substrate 33, the control substrate 87, and the power
supply substrate 89 are provided internally, or only the microphone substrate 33 is provided
internally.
The former configuration is the main unit 79, and the latter configuration is the sub unit 81. The
arc-shaped microphone housing can be assembled as a semicircle, a quarter circle, a quarter
circle, or the like. That is, the microphone array device 85 can be reassembled into a semicircle, a
quarter circle, a quarter circle, etc., and can be installed at the wall 91, the inside corner 83 of the
wall, or the corner of the wall or column. Become.
[0095]
In one embodiment of the present invention, in the microphone device, a substrate having a
diameter equal to or greater than the diameter of the camera device is concentrically
accommodated in the disk-like microphone casing, and from the central portion of the substrate
It is a sound collection system in which a plurality of signal lines are radially formed
equidistantly.
[0096]
According to the above-described configuration, in the sound collection system 31, when the
control unit (for example, processor) is disposed at the center of the microphone substrate 33,
the signal lines provided in the periphery become equal in length and signal transmission after
sample processing The time difference can be reduced evenly.
[0097]
In one embodiment of the present invention, the microphone device is a sound collection system
in which a plurality of different types of function-specific circuit boards are disposed in the
annular microphone housing along an outer periphery of the camera device.
03-05-2019
26
[0098]
According to the above-described configuration, in the sound collection system 11, when the
microphone array device 15 is, for example, an arc microphone housing, the analog circuit
portion, the digital circuit portion, the power supply circuit portion, and the microphone portion
are provided in the arc microphone housing. Each can be installed separately.
That is, it becomes possible to arrange the small different types of function-specific circuit boards
in the circumferential direction.
[0099]
As a result, in the microphone array device 15, the function-specific circuit boards are operated
by function (analog, digital, power supply block), and the boards are less susceptible to each
other's noise.
The function-specific circuit boards may be provided in different types in the circumferential
direction of the annular microphone case.
In addition, it is possible to cope by increasing the same shape, the same parts, and mounting
substrates according to the number of microphones (for example, it can correspond to 1/4 size,
1/3 size, 1/2 size, etc.), and cost reduction is achieved. It becomes possible. In addition, when two
or more separate arc-shaped microphone cases are connected, only one side of the whole case is
used as the main unit, and the other is used as an arbitrary number of sub-units. It can be made
changeable.
[0100]
Moreover, one embodiment of the present invention is a sound pickup system in which a lid is
attached instead of the camera device.
[0101]
03-05-2019
27
In the configuration described above, in the sound collection system 11, the lid is formed, for
example, in the same shape as the omnidirectional camera device 13.
Thus, the acoustic characteristics of the audio signal collected by the microphone array device do
not change in the omnidirectional camera device 13 and the integrated sound collection system
and the omnidirectional camera device and the separate sound collection system. Moreover, even
if a perfect plane is realized using a lid, changes in acoustic characteristics are suppressed. In
addition, a change in acoustic characteristics is also suppressed by filling the sound absorbing
material (for example, a sponge) in the inner circumferential space or the central recess.
[0102]
In one embodiment of the present invention, the microphone installation surface of the annular
microphone housing and the upper surface end of the camera device inserted into the inner
circumferential space are installed without any step.
[0103]
In the configuration described above, the sound collection system 11 includes, for example, the
upper surface (for example, the surface to which the microphone unit 17 is attached) of the
annular microphone housing 25 of the microphone array device 15 and the upper surface of the
disk shaped housing of the omnidirectional camera device 13 For example, the surface with the
fisheye lens 21 has a positional relationship without steps (for example, a horizontal surface or a
continuous curved surface close to the horizontal surface), and therefore no factor causing
acoustic characteristics deterioration such as sound reflection does not occur.
[0104]
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 and modifications can be made
within the scope of the appended claims, and of course these also fall within the technical scope
of the present invention. It is understood.
03-05-2019
28
[0105]
The present invention is an acoustic characteristic of an audio signal collected in a
predetermined sound collection space, regardless of whether the housings of the camera device
and the microphone device are disposed integrally or separately. It is useful as a sound collection
system which suppresses the deterioration of the camera and improves the convenience when
installing the camera device and the microphone device.
[0106]
11 sound collecting system 13 omnidirectional camera device 15 microphone array device 17
microphone unit 19 air gap 23 inner circumferential space 25 annular microphone housing 27
ceiling surface 29 hole 33 microphone substrate 35 central recess 37 disk-shaped microphone
housing 41 air vent 55 microphone cable 59 Microphone housing door part 65 Annular
microphone housing body part 77 Unit housing 93 Circuit board according to functions 111
Sound absorbing material 115 Omnidirectional camera device pseudo lid 121 Flat lid
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