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JP2007129487

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2007129487
The present invention provides an audio transmitting / receiving apparatus which can arrange a
microphone and a speaker closer to each other and can more effectively prevent the generation
of an echo. An audio signal transmitting / receiving apparatus includes an apparatus main body,
a sound output unit provided in the apparatus main body, and a microphone array 24 in which a
plurality of unidirectional microphones 241 are arrayed. As described above, by using the
microphone array 24 and configuring the microphone array 24 with the unidirectional
microphones 241, wraparound of sound from the sound emitting unit to the microphone array
24 can be prevented, and the microphone and the speaker can be made more It becomes
possible to arrange closely and to prevent generation of echo more effectively. [Selected figure]
Figure 5
Audio signal transmitter and receiver
[0001]
The present invention relates to an audio signal transmitting and receiving apparatus that
transmits and receives an audio signal to and from an audio signal transmitting and receiving
apparatus of the other party.
[0002]
Heretofore, there has been known an audio signal transmitting and receiving apparatus in which
a speaker and a microphone are disposed in the same case (see Patent Document 1).
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1
In this voice signal transmitting / receiving device, the voice received from the other party is
emitted to the outside of the device by the speaker, and the voice of the user collected by the
microphone is transmitted to the other party, thereby making a call or voice conference between
the other party It is possible to do JP-A-8-298696
[0003]
In the above-described conventional audio signal transmitting / receiving apparatus, the position
of the speaker and the microphone must be disposed closer to each other as the size is reduced.
For this reason, the sound emitted from the speaker can easily get into the microphone. In the
conventional audio signal transmitting / receiving apparatus, echo cancellation for canceling the
wraparound voice is performed by applying signal processing for echo cancellation to the voice
signal collected by the microphone, but the wraparound is removed only by the audio signal
processing. There were cases where it was not possible to prevent the occurrence of echo
sufficiently.
[0004]
In order to solve the above problems, it is an object of the present invention to provide an audio
transmitting / receiving device which can arrange a microphone and a speaker closer to each
other and can more effectively prevent the occurrence of an echo.
[0005]
In order to solve the above-mentioned subject, the following means are adopted in the present
invention.
[0006]
(1) The present invention is an audio signal transmitting / receiving apparatus comprising an
apparatus main body, a sound emitting unit disposed in the apparatus main body, and a
microphone array in which a plurality of unidirectional microphones are arrayed. .
[0007]
According to the above configuration, it is possible to form and collect a sound collection beam
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specialized for a specific sound collection area by the microphone array.
Thus, the sound emitting part is effectively removed from the sound collecting area by effectively
preventing the sound from being emitted from the sound emitting part.
[0008]
Furthermore, since each microphone constituting the microphone array is a unidirectional
microphone, by providing the sound output unit in the direction in which the sensitivity of the
microphone array is low, sound from the sound output unit can be collected by the microphone
array. Can be effectively prevented.
[0009]
(2) The present invention is the above audio signal transmitting and receiving device, wherein
the sound emitting unit is provided in the direction in which the sensitivity of the microphone
array is low.
According to this configuration, since the sound emitting unit is provided in the direction in
which the sensitivity of the microphone array is low, it is possible to effectively prevent the
sound from the sound emitting unit from being picked up by the microphone array.
[0010]
(3) In the audio signal transmitting and receiving apparatus according to the present invention,
the sound emitting unit is a speaker array in which a plurality of speaker units are arranged, and
the arrangement direction of the microphones and the arrangement direction of the speaker
units are Parallel to each other, wherein the sound collecting surface of the microphone array
and the sound emitting surface of the speaker array are disposed at right angles to each other
and the sound collecting direction and the sound emitting direction are directed to the outside. It
features.
[0011]
According to the above configuration, the sound collecting surface and the sound emitting
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surface are disposed at right angles, and it becomes possible to arrange the speaker array in the
direction of the lowest sensitivity of the unidirectional microphone. It is possible to arrange the
microphone array at a position where the sound pressure of the sound from the speaker array is
low.
This makes it possible to more effectively prevent acoustic coupling in which sound from the
speaker array is input to the microphone array.
[0012]
(4) In the present invention, in the above-mentioned audio signal transmitting and receiving
device, the device main body includes a frame for attaching the microphone array, and a plurality
of small holes are provided around the attachment position of each microphone of the frame. Are
formed.
In order to effectively cancel the wraparound sound from directions other than the directional
direction with a single microphone, it is ideal to arrange in a sound field equivalent to floating in
the air.
[0013]
In the present invention, the formation of the small holes effectively prevents the influence of the
acoustic resistance due to the frame body, thereby making the microphone close to the ideal
state, thereby more effectively excluding the directivity direction in each microphone. It is
possible to cancel the wraparound sound from the direction of.
Moreover, since it is a small hole, it is possible to cancel the wraparound sound while securing
the strength of the frame.
[0014]
(5) In the present invention, in the above audio signal transmitting and receiving device, the
frame is a member having a substantially U-shaped cross section formed by bending at least one
edge in the width direction of a long flat plate at a substantially right angle. The speaker array is
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attached to the upper surface of the frame so that the sound emission direction is on the frame
side, and a hole is formed at the position of the speaker unit, and the bent edge of the frame is
The microphone array is embedded in the longitudinal direction so that the sound collecting side
is directed outward, and the edge of the upper surface of the frame on the microphone array side
and the edge where the microphone array of the frame is disposed And the small holes are
formed.
[0015]
According to the above configuration, the sound emission direction of the speaker array and the
sound collection direction of the microphone array can be arranged to be orthogonal to each
other, and the speaker array can be arranged in the direction in which the sensitivity of the
microphone array is low. It will be possible.
[0016]
In addition, the small holes in the upper surface of the frame and the small holes in the edge of
the frame more effectively prevent the influence of the acoustic resistance due to the frame, and
more effectively wrap around from directions other than the directivity direction in each
microphone It becomes possible to cancel the sound.
[0017]
(6) In the audio signal transmitting / receiving apparatus according to the present invention, the
small holes are formed at positions where sound from the speaker array propagates from the
direction of least sensitivity of the microphone array. It is characterized by
According to this configuration, since the sound from the speaker array is transmitted to the
microphone from the direction of the microphone array with the lowest sensitivity, the small
holes can further reduce the influence of the acoustic resistance by the frame on the single
microphone. It is possible to effectively prevent the microphone from collecting the sound from
the speaker array that has arrived via the small hole.
[0018]
According to the present invention, the sound emitting part is removed from the sound collecting
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area, and the sound emitting part is provided in the direction in which the sensitivity of the
unidirectional microphone is low, thereby effectively preventing the sound from coming around
the sound emitting part. be able to.
As a result, it is possible to effectively prevent the occurrence of howling due to the sound that
has entered the microphone array while the sound emitting unit and the microphone array are
disposed closer to each other.
[0019]
First Embodiment An audio signal transmitting / receiving apparatus 1 according to a first
embodiment of the present invention will be described in detail below with reference to FIGS. 1
to 7.
The voice signal transmitting / receiving apparatus 1 is connected to a network such as the
Internet or a LAN. The audio signal transmitting / receiving apparatus 1 transmits / receives an
audio signal to / from the audio signal transmitting / receiving apparatus 1 of the other party via
the network, whereby a user can talk to the user with the other party's audio conference
apparatus 1 or an audio between remote places Have a meeting.
[0020]
FIG. 1 is a perspective view showing the appearance of the audio signal transmitting / receiving
apparatus 1. In the following description, the front side of the audio signal transmitting /
receiving apparatus 1 is described as Y, the rear side as -Y, the right side as X, and the left side as
-X. 2A is a plan view of the audio signal transmitting / receiving device 1 shown in FIG. 1, FIG. 2B
is a rear view of the audio signal transmitting / receiving device 1 as viewed from the -Y side, and
FIG. It is the front view which looked at the audio | voice signal transmitter / receiver 1 from Y
side. FIG. 3A is a right side view of the audio signal transmitting and receiving apparatus 1 as
viewed from the X side, and FIG. 3B is a left side view of the audio signal transmitting and
receiving apparatus 1 as viewed from the -X side.
[0021]
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The audio signal transmitting / receiving apparatus 1 is formed by supporting an apparatus body
2 of a long, substantially rectangular parallelepiped shape at a predetermined height from an
installation surface by substantially square U-shaped leg portions 3 fitted on both sides thereof.
The apparatus body 2 has an upper surface panel 20, a lower surface grille 21 and side panels
22 (22A, 22B) as a housing, and a long elongated speaker array 231 (described later with
reference to FIG. 4) inside the housing. A speaker device 23 (described later with reference to
FIG. 5) and a two-row microphone array 24 (described later with reference to FIG. 5) are
provided.
[0022]
The speaker array 231 is provided in a row in the longitudinal direction on the lower surface of
the speaker device 23, and the microphone arrays 24 are provided in a row on both sides of the
speaker device 23 in the longitudinal direction. The configurations of the speaker device 23, the
speaker array 231, and the microphone array 24 will be described later in detail.
[0023]
The top panel 20 and the side panel 22 are resin panels as a cover of the internal structure
including the speaker array 231 and the microphone array 24, the top panel 20 is a long
member having a U-shaped cross section, and the side panel 22 is a flat plate. Shaped members.
Further, the lower surface grille 21 is a steel plate of punch mesh having a substantially Ushaped cross section so as not to disturb the sound emission and sound collection of the speaker
array 231 and the microphone array 24.
[0024]
The operation unit 4 is embedded at the X-side end of the upper surface of the upper surface
panel 20, and the LED lighting unit 5 is embedded substantially at the center. As shown in FIG.
2A, the operation unit 4 has an LCD (Liquid Crystal Display) 41 for displaying a setting state etc.
on the -X side, and an operation button group 42 for communication such as a ten key on the X
side. Arrange in parallel to be located.
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[0025]
Furthermore, the operation unit 4 includes an operation button group 43 and an operation
button group 44 in parallel on the Y side of the LCD 41 and the operation button group 42. The
operation button group 43 is disposed on the −X side with respect to the operation button
group 44, and is for instructing volume up, down, or mute. The operation button group 44 is for
changing the setting of the audio signal transmitting / receiving apparatus 1. This setting
includes, for example, selection setting of any one of a first lighting mode and a second lighting
mode, which will be described later.
[0026]
The LCD 41 and the operation button groups 42 to 44 are all disposed with the Y side down, so
that operation and operation confirmation can be performed from the Y side.
[0027]
The LED lighting unit 5 includes a plurality of (five in the present embodiment) linear LED lamps
51 on the −Y side and the Y side.
The plurality of LED lamps 51 are arranged on the same parabola extending in the X-X direction.
Lighting of each LED lamp 51 is independently controlled by a lighting control unit (not shown)
attached to the inside of the top panel 20. Specifically, when the first lighting mode is set by the
operation button group 44, the directivity direction of the sound beam from the speaker array
231 described later among the LED lamps 51 is controlled to light up. Ru. This allows the user to
confirm the pointing direction of the voice beam.
[0028]
When the second lighting mode is set, the pointing direction of the sound collection beam of the
microphone array 24 described later is controlled to light. In addition, the LED lamp 51 group of
Y side lights about the microphone array 24 of Y side, and the LED lamp 51 of-Y side lights about
the microphone array 24 of-Y side. This makes it possible to confirm whether voice is being input
and also allows the user to confirm the pointing direction of the sound collection beam.
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[0029]
In the present embodiment, the voice signal transmitting / receiving apparatus 1 has a function
of controlling the sound collection beam in a plurality of areas and detecting the position of the
speaker based on the sound collection level in each area. The user can check whether the
position of the speaker has not been erroneously detected.
[0030]
In addition, the light emission mode is controlled to change according to the volume of the input
and output sound.
This allows the user to confirm that the sound input / output is performed at a sufficient volume.
[0031]
The connector group 6 with the external device is embedded in the side panel 22 (22A) on the X
side (see FIG. 3A). The connector group 6 includes a modular jack 61 for connecting to a LAN
such as Ethernet (registered trademark) or a network such as the Internet, an audio input
terminal 62A and an audio output terminal 62B for connecting to an audio device, and a power
source. The power supply terminal 63 is provided.
[0032]
By inserting a plug (not shown) of a modular cable into the modular jack 61, it becomes possible
to connect the audio signal transmitting / receiving device 1 to a network. As a result, the present
audio signal transmitting / receiving apparatus 1 can be connected to the network and
communicably connected to the other party's audio signal transmitting / receiving apparatus 1.
For this reason, it is possible to make a call or an audio conference with the voice signal
transmitting / receiving apparatus 1 of the other party, so that the voice signal transmitting /
receiving apparatus 1 can be used as an IP telephone or a voice conference apparatus. .
[0033]
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FIG. 4 is a bottom view of the audio signal transmitting and receiving apparatus 1 with the lower
surface grille 21 removed. FIG. 5 is a perspective view of a central portion of the audio signal
transmitting / receiving apparatus 1 of FIG. 6 is a cross-sectional view of the audio signal
transmitting / receiving apparatus 1 of FIG. FIG. 7 is a front view of the audio signal transmitting
/ receiving apparatus 1 of FIG.
[0034]
The speaker array 231 and the microphone array 24 are both attached to a frame 25 which also
serves as a baffle of the speaker array 231. The frame 25 is a box-like member in which the four
corners of a rectangular metal plate are bent upward. The speaker array 231 is attached
downward to the inside of the bottom of the frame 25, and the microphone array 24 has one row
(microphone array 24A) embedded in one side (Y side) of the frame 25 and the other one row
(microphone array 24B) Is embedded in the other side (-Y side).
[0035]
The lower end of a long cylindrical frame 232 (the side plate of the present invention) is disposed
on the upper side of the frame 25 so as to cover the side surface of the speaker array 231. The
hand side surface) is screwed to the side surface of the frame 25 (folded portion in the short
direction). As described above, since the frame 25 is formed in a box shape and the frame 232 is
screwed at a bent portion in the short direction of the frame 25, the frame 232 and the frame 25
can be firmly attached.
[0036]
A top plate 233 having substantially the same size as the bottom surface of the frame 25 is
disposed at the upper end of the frame body 232 so as to cover the back surface of the speaker
array 231. A support plate 26 which is a metal plate member is attached to a side surface (a
bending portion in the longitudinal direction) of the frame 25 so as to extend upward by a screw
27A, and the upper end of the support plate 26 is bent inward. . The bent portion and the end
portion in the short side direction of the top plate 233 are attached by a screw 27 B, and thereby
the frame body 232 is held between the top plate 233 and the bottom surface of the frame 25.
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[0037]
As described above, the housing 23A of the speaker array 231 is formed of a portion surrounded
by the frame 25, the top plate 233, and the cylindrical frame 232. A substrate (not shown) on
which a control unit (not shown) for controlling directivity of the speaker array 231 and the
microphone array 24 is mounted on the top surface of the housing 23A (the top surface of the
top plate 233). The speaker device 23 includes a control unit, a housing 23A, and a speaker array
231.
[0038]
In the speaker array 231, a plurality (for example, 16) of speaker units SP are arranged
substantially equally in a line, and a hole of the same size as the inner diameter of the speaker
units SP at the position of each speaker unit SP on the bottom of the frame 25 A portion 251 on
the sound emission side of the speaker unit SP is overlapped according to the hole 251. As
described above, the bottom surface of the frame 25 and the speaker array 231 are attached by
the screws 252 in a state in which the speaker unit SP is superimposed on the hole 251. By this,
a sound emitting surface is attached so as to look from the bottom surface, and the sound of each
speaker unit SP can be output from the bottom surface.
[0039]
As described above, by arranging the speaker array 231 toward the bottom surface of the audio
signal transmitting and receiving device 1, the audio beam from the speaker array 231 is output
to the lower side of the audio signal transmitting and receiving device 1. Since the audio signal
transmitting / receiving apparatus 1 is supported by the legs 3 at a predetermined height from
the installation surface (for example, a top of a desk), the audio beam is reflected by the
installation surface and propagates obliquely upward. As a result, it is possible to efficiently
provide an audio beam to the user whose head is located at the upper part on the Y-Y side of the
audio signal transmitting / receiving device 1.
[0040]
Further, since the leg portion 3 has an inner space structure, it is possible to provide the user
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with a sound without disturbing the sound emitted by the speaker array 231 or the reflected
sound on the installation surface.
[0041]
The control unit (not shown) gives a delay time to the voice signal from the voice signal
transmitting / receiving device 1 of the other party input through the modular jack 61 (see FIG.
1) to control directivity of the voice beam, received from the other party The amplified audio
signal is subjected to D / A conversion and amplification of the level of the converted audio
signal to be input to the speaker array 231.
[0042]
The microphone array 24 is composed of a plurality of (for example, 16) microphones 241
arranged in a line across the side surfaces (the bending portions in the longitudinal direction) of
the frame 25 as described above.
The microphones 241 are unevenly arranged so as to be denser toward the inside, whereby it is
possible to preferably pick up high-pitched sound with high directivity.
[0043]
The microphone array 24 is supported from the opposite side of the frame 25 by the support
plate 26 in which the notch 261 is formed at the position of the microphone 241, and the frame
25 and the support plate 26 are in a state where the microphone 241 is fitted in the notch 261.
And are screwed.
The frame 25 and the support plate 26 constitute a frame of the present invention.
[0044]
As described above, the speaker array 231 is disposed toward the bottom surface of the speaker
device 23, and the microphone arrays 24A and 24B are attached toward the side surfaces of the
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speaker device 23 (facing the respective side surfaces of the audio signal transmitting / receiving
device 1). As a result, it is possible to arrange the sound collection surface of the microphone
array 24 and the sound emission surface of the speaker array 231 at right angles. At the same
time, the microphone array 24 and the speaker array 231 can be arranged such that the sound
emission direction and the sound collection direction are directed outward.
[0045]
By arranging the microphone array 24 and the speaker array 231 in such a positional
relationship, the microphone array 24 collects sound by focusing on a specific sound collection
area with a sound collection beam, and the sound from the speaker array 231 is rotated. It is
hard to produce garbage. In addition, the microphone array 24 can be disposed at the lowest
position of the sound pressure of the sound from the speaker array 231, which also effectively
prevents the sound from the speaker array 231 from coming around the microphone array 24.
Becomes possible.
[0046]
Each of the microphones 241 has a hole (not shown) formed at a side position on the rear side of
the diaphragm (not shown), and the voice from the back is inputted through this hole, and the
microphone 241 is wound around the microphone array 24 from behind. A unidirectional
microphone that cancels voice. As described above, by performing the sound collection by the
microphone array 24 composed of the unidirectional microphones 241, it is possible to
effectively prevent the sneaking from the speaker array 231, and the generation of the echo is
effectively performed. It becomes possible to prevent.
[0047]
Further, by arranging the sound collecting surface of the microphone array 24 and the sound
emitting surface of the speaker array 231 to be at right angles, the speaker array 231 can be
arranged in the direction in which the sensitivity (gain) of the microphone 241 is low. By this, it
is possible to effectively suppress the acoustic coupling in which the sound from the speaker
array 231 gets around to the microphone array 24. This arrangement also results in the
microphone array 24 being disposed in the direction in which the directivity of the speaker array
231 is low. By this, it is possible to effectively suppress the acoustic coupling in which the sound
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from the speaker array 231 gets around to the microphone array 24.
[0048]
Each microphone 241 is attached to the frame 25 so that the position of the hole (not shown) is
on the inner side of the frame 25, and each microphone 241 on the bottom of the frame 25
receives sound from the speaker array 231 in this hole. A hole 253 is formed at the rear position
of the. Further, five round holes 262B are formed around each microphone 241 in the support
plate 26, and a long hole 262A is formed between the microphones 241. The holes 253, 262A,
262B are small holes that can ensure the strength of the frame 25 and the support plate 26.
[0049]
By forming the holes 253, 262A, 262B as described above, the acoustic resistance of the frame
25 and the support plate 26 prevents the microphone 241 from being unable to effectively
cancel the sound from directions other than the pointing direction. It becomes possible. Further,
holes 253, 262A, 262B are formed at positions where the sound from the speaker array 24
reaches the microphone 241 in the direction of the microphone 241 with the lowest sensitivity.
Therefore, the sound from the speaker array 24 can be picked up by the microphone 241 while
the effects of the acoustic resistance of the frame 25 and the indication plate 26 can be
effectively prevented by the holes 253, 262A, 262B. Can be prevented.
[0050]
The microphone array 24 is connected to a control unit (not shown) by a signal line (not shown),
and thereby inputs each signal collected by each microphone 241 to the control unit. These input
signals are subjected to directivity control by delay control after A / D conversion, and are
transmitted to voice signal transmitting / receiving apparatus 1 of the other party via modular
jack 61 (see FIG. 1), modular cable (not shown), etc. Will be sent.
[0051]
As described above, in the present embodiment, the microphone array 24 picks up the sound by
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the sound collection beam, so that the wraparound of the sound from the speaker array 231 can
be effectively prevented. Furthermore, since each microphone 241 is a unidirectional
microphone and the speaker array 231 is provided in the direction in which the sensitivity of the
microphone array 24 is low, it is possible to more effectively prevent the sneaking from the
speaker array 231. As a result, while the speaker array 231 and the microphone array 24 can be
brought close to each other to make the audio signal transmitting / receiving device 1 compact,
generation of echo can be effectively prevented.
[0052]
In the present embodiment, a plurality of microphone arrays 24 are provided. However, the
present invention is not limited to this configuration, and any one of the microphone arrays 24A
and 24B may be provided.
[0053]
The unidirectional microphone is not limited to the configuration in which the hole (not shown)
is formed on the side surface behind the diaphragm (not shown), but may be formed on the back
surface.
[0054]
It is a perspective view which shows the external appearance of an audio | voice signal
transmitter / receiver.
(A) is a plan view of the audio signal transmitting / receiving device shown in FIG. 1, (B) is a rear
view of the audio signal transmitting / receiving device viewed from the -Y side, (C) is the audio
signal transmitting / receiving device on the Y side It is the front view seen from.
(A) is a right side view of the audio signal transmitting and receiving apparatus 1 as viewed from
the X side, and (B) is a left side view of the audio signal transmitting and receiving apparatus 1 as
viewed from the -X side. It is a bottom view in the state where the grille of the audio signal
transmitting and receiving device has been removed. It is a perspective view of the center part of
the audio | voice signal transmitter / receiver 1 of FIG. It is AA sectional drawing of the audio |
voice signal transmitter / receiver of FIG. It is a side view of the audio | voice signal transmitter /
receiver of FIG.
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Explanation of sign
[0055]
1, 1 '-voice signal transmitting / receiving device 2- device main body 3- leg 4- operation unit
231-speaker array SP-speaker unit 24 (24A, 24B)-microphone array 241-microphone 61modular jack (connector) 62B- Audio output terminal (connector) 62A-audio input terminal
(connector)
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