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DESCRIPTION JP2009260948

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DESCRIPTION JP2009260948
An object of the present invention is to provide a voice processing apparatus capable of changing
a sound collection range according to a use case of a user. A sound emission and collection
device 1 is mechanically constituted by a substantially triangular main housing 10 and two
rectangular parallelepiped sub housings 11 and 12. In the main housing 10, the speaker SP is
installed near the approximate center, and a microphone array 1150 whose sound collection area
is outward from the side wall in the front direction is installed. The microphone arrays 1151 and
1152 are installed in the sub-housings 11 and 12 respectively in contact with one side wall
different from the main housing 10 with the outer side opposite to the main housing 10 side as
the sound collecting direction. Ru. The sub-housings 11 and 12 are rotatably connected to the
main housing 10. The sound emission and collection device 1 forms a plurality of collected sound
beam signals MB10 to MB12 based on the collection of sound by the microphone arrays 1150 to
1152 in accordance with the amount of rotation of the sub-housings 11 and 12 with respect to
the main housing 10. Perform control and addition processing. [Selected figure] Figure 3
Voice processing device
[0001]
The present invention relates to an audio processing apparatus that performs sound collection
control according to the amount of rotation of a plurality of connected microphone arrays, and
forms a sound collection beam signal.
[0002]
Conventionally, various types of voice processing devices have been proposed in which howling
or echo or the like generated when a microphone picks up a voice signal emitted from a speaker
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is suppressed (see, for example, Patent Document 1).
[0003]
In the audio conference apparatus of Patent Document 1, a speaker is provided at the center of
the housing, and microphones are provided at the four corners of the housing.
By covering the microphone with an elastic body and projecting the microphone to the outside of
the housing, in the audio conference apparatus of Patent Document 1, the microphone does not
pick up a sound emission signal from the speaker propagated inside the housing.
[0004]
Japanese Patent Application Publication No. 08-298696
[0005]
However, in the audio conference apparatus of Patent Document 1, although audio can be
collected from the entire periphery of the case, it is possible to collect audio from a specific
direction by controlling the sound collection directivity. Can not.
[0006]
Therefore, the present invention provides a voice processing apparatus capable of realizing a
plurality of voice collection directivity patterns such as voices from all around and voices from a
specific direction.
[0007]
The audio processing apparatus according to the present invention includes a main housing in
which a microphone array is installed on a side wall, and a plurality of sub-housings in which the
microphone array is installed.
The voice processing device rotatably connects the sub-housings with the two ends of one side
on which the microphone array of the main housing is installed as the rotation center.
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The voice processing device detects the amount of rotation of each sub-housing relative to the
main housing, and detects the relative position of each sub-housing relative to the main housing
from the amount of rotation.
The audio processing device generates a plurality of collected sound beam signals based on the
audio signals collected by the microphone arrays of the main housing and each sub housing
according to the relative position of the main housing to each sub housing. .
[0008]
As a result, the sound processing device can easily change the sound collection range simply by
rotating each sub housing.
Further, the sound collection range can be changed according to the use case of the user.
[0009]
Further, the audio processing device of the present invention may be configured to include a
speaker in the main housing. In this case, the voice processing device suppresses the emitted
voice component of the speaker in the voice signal after addition by performing phase control
and addition processing of the respective collected sound beam signals.
[0010]
Thus, the audio processing device can emit sound from the speaker and can suppress the emitted
sound component of the speaker included in the collected sound. As a result, it is possible to
suppress the generation of howling and echo and to reduce the load on the echo canceller.
[0011]
Furthermore, in the voice processing apparatus according to the present invention, an
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omnidirectional sound collection arrangement (for example, FIG. 3, FIG. 6, and FIG. 6) in which
the sound collection range is omnidirectional with all microphone arrays of the main housing and
each sub housing. When the state shown in 9) is detected, all directions are collected uniformly
to form the plurality of collected sound beam signals, and each of the collected sound beam
signals is collected based on the angle formed by the main directions. The phase of the sound
beam signal may be controlled and added.
[0012]
As a result, the voice processing device can suppress the emitted sound component of the
speaker included in the collected voice and can uniformly collect the sound from the entire
periphery of the device.
[0013]
In addition, the voice processing device of the present invention differs from the omnidirectional
sound pickup arrangement due to the rotation of the sub-housing, the end of the microphone
array of each sub-housing (the end of the side connected to the main housing When it is detected
that the end on the opposite side to the extension line of one side where the microphone array of
the main case is installed (for example, the state shown in FIG. 4, FIG. 7, and FIG. 10) The sound
collection beam signal may be formed on the side of the positive rotation direction (direction of
rotation from the side wall of the sub case toward the extension line) than the direction
perpendicular to the microphone array of the body.
[0014]
The voice processing device does not pick up the sound emitted from the speaker as much as
possible by not picking up the voice from the direction in which the user will not be seated.
As a result, the voice processing device can further suppress the collected voice based on the
sound emission of the speaker.
[0015]
Further, in the voice processing apparatus according to the present invention, each sub-housing
extends beyond the extension line of one side where the microphone array of the main housing is
installed by the rotation of the sub-housing (for example, FIG. 5, FIG. When the state shown in
FIG. 11 is detected, the sound collection beam signals based on the sound collection of the main
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case are not added, and only the sound collection beam signals based on the sound collection of
each sub case are added.
[0016]
In the voice processing apparatus, the speaker is installed in the main case, and the microphone
array of the main case is closest to the position of the speaker. Contains the most signals.
Since the voice processing device does not add the sound collection beam signal based on the
sound collection of the main housing, it is possible to further suppress the emitted sound
component of the speaker included in the collected sound.
[0017]
According to the voice processing apparatus of the present invention, the sound collection range
can be easily changed only by rotating each sub-housing, and the sound collection range can be
changed according to the use case of the user.
[0018]
It is a top view in the basic posture of the sound emission and collection device of this
embodiment.
It is a functional block diagram of the sound emission and collection device of this embodiment.
It is a figure which shows the example which is seated around the sound emission and collection
apparatus.
It is a figure showing an example in which a plurality of people are seated on the front of a sound
emission and collection device. It is a figure which shows the example in which one person sits in
the front of a sound emission and collection apparatus. FIG. 7 is a view showing an example of
sitting around the sound emitting and collecting apparatus of the second embodiment. FIG. 14 is
a diagram showing an example in which a plurality of people are seated at the front of the sound
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emission and collection device of the second embodiment. FIG. 14 is a diagram showing an
example in which one person is seated at the front of the sound emission and collection device of
the second embodiment. FIG. 18 is a diagram showing an example of sitting around the sound
emitting and collecting apparatus of the third embodiment. FIG. 18 is a diagram showing an
example in which a plurality of people are seated at the front of the sound emission and
collection device of the third embodiment. FIG. 18 is a view showing an example in which one
person is seated at the front of the sound emission and collection device of the third
embodiment.
[0019]
A sound emission and collection device (corresponding to a voice processing device of the
present invention). The function and configuration of 1) will be described with reference to FIGS.
FIG. 1 is a plan view of the sound emitting and collecting apparatus of the present embodiment in
a basic posture. FIG. 2 is a functional block diagram of the sound emission and collection device
of the present embodiment. The sound emission and collection device 1 is a personal computer
(hereinafter referred to as a PC) having a communication function. ) And performs voice
communication with another voice communication device, a video conference device, etc. via a
PC.
[0020]
As shown in FIG. 1, the sound emission and collection device 1 mechanically includes a main
housing 10 and two sub-housings 11 and 12 rotatably installed relative to the main housing 10.
Be done. In the following description, the number of microphones MIC installed in each of the
main housing 10 and the sub housings 11 and 12 is four, and the number of speakers SP
installed in the main housing 10 is two. The number of microphones MIC and the number of
speakers SP may be set appropriately according to the specifications.
[0021]
The main housing 10 has a substantially triangular shape in a plan view, and has a thickness that
allows the microphone MIC to be installed along the side wall. The main housing 10 has three
side walls, and the four microphones MIC are directed outward from the front side wall on the
inner side of the front side wall (the side wall having a wall surface downward in FIG. 1). It is
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installed as a sound direction. The four microphones MIC are arranged in parallel to the front
direction side wall at a predetermined interval, and the microphone array 1150 having a sound
collection area outward from the front direction side wall is configured by the four microphones
MIC.
[0022]
On the upper surface of the main housing 10 (the surface viewed in plan in FIG. 1), an operation
unit 110 including a plurality of operators is installed. The plurality of operators are arranged in
parallel to the front direction side wall as shown in FIG. Here, the plurality of operators are, for
example, an operator that receives start and end of sound emission and collection, an operator
that receives volume adjustment of sound emission sound, an operator that receives microphone
mute, and the like.
[0023]
Two speakers SP are installed parallel to the front direction side wall and at an interval at which
stereo speaker control can be performed, in the vicinity of the approximate center of a triangle of
the main housing 10 in plan view. In addition, the region other than the operation unit 110 of the
upper surface wall of the main housing 10 and the side wall in the front direction are meshed.
[0024]
Although not shown, a USB connection terminal, an analog audio IN terminal, an analog audio
OUT terminal, and a power supply are provided as input / output I / F 113 (see FIG. 2) at a
portion corresponding to a diagonal of the front direction side wall of main housing 10. An input
terminal is installed.
[0025]
The portions corresponding to the corners of both ends of the front direction side wall of the
main housing 10 are pivot connection portions 13A and 13B with the sub-housings 11 and 12,
respectively. As the sub-housings 11 and 12 rotate with respect to the main housing 10.
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Rotary encoders 1121 and 1222 (see FIG. 2) are installed at the rotational connection portions
13A and 13B, and the rotary encoder 1121 acquires a rotation detection signal corresponding to
the amount of rotation of the sub housing 11, The encoder 1122 acquires a rotation detection
signal corresponding to the rotation amount of the sub housing 12.
[0026]
The sub casings 11 and 12 have a length in the long side direction substantially the same as one
side of a triangle of the main casing 10, a length in the short side direction of a predetermined
length, and a thickness substantially the same as the main casing 10 It has a rectangular
parallelepiped shape. One end in the long side direction of the sub-housings 11 and 12 is
connected to the main housing 10 at pivot connection portions 13A and 13B. In the sub-housings
11 and 12, the state in which all sides in the long side direction abut the main case 10 is one end
of the rotation range, and the long side direction and the front side wall of the main case 10 are
parallel. In the range which makes the position which becomes a predetermined angle projected
in the front direction further from the front direction side wall of the main case 10 as the other
end of the rotation range.
[0027]
The sub-housing 11 is in contact with one side wall of the main housing 10 (in the case of FIG. 1,
the side wall which is on the upper right side), the outer side (in the case of FIG. The four
microphones MIC are installed with the sound pickup direction as the upper right direction).
These microphones MIC are arranged at predetermined intervals along the long side direction of
the sub-housing 11, and a microphone array having a sound collection area outside the
microphone MIC installation side of the sub-housing 11 by these four microphones MIC 1151 is
comprised.
[0028]
The sub-housing 12 is in contact with one side wall of the main housing 10 (in the case of FIG. 1,
the side wall which is on the upper left side), the outer side (in the case of FIG. The four
microphones MIC are installed with the sound pickup direction as the upper left direction). These
microphones MIC are arranged at predetermined intervals along the long side direction of the
sub-housing 12, and a microphone array having a sound collection area outside the side of the
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microphone MIC installation side of the sub-housing 12 by these four microphones MIC 1152 is
comprised.
[0029]
The sound pickup signals of the microphones MIC of the microphone arrays 1151 and 1152 are
supplied to the sound pickup beam forming unit 116 (see FIG. 2) of the main housing 10 through
the pivot connection units 13A and 13B.
[0030]
Further, as shown in FIG. 2, the sound emission and collection device 1 functions as a functional
unit in the main housing 10 together with the input / output I / F 113 described above, the
operation unit 110, the microphone arrays 1150 to 1152, and the rotary encoders 1121 and
1122. The control unit 111, the sound output control unit 114, the sound collection beam
forming unit 116, and the sound collection beam combining unit 117 (the sound collection beam
forming unit 116, and the sound collection beam combining unit 117 correspond to the sound
collection control means of the present invention. , An echo canceller 118, and a speaker SP.
[0031]
The control unit 111 performs overall control of the sound emission and collection device 1.
The control unit 111 performs control based on the command input by each operation element
of the operation unit 110.
For example, when the control unit 111 receives an operation input for start / end of the sound
emission / reception, the control unit 111 instructs the sound emission control unit 114 to start
sound emission of the sound emission sound signal and instructs the sound emission end to The
unit 117 instructs the unit 117 to start and stop output of the sound collection beam signal MB.
When the control unit 111 receives an operation input for volume adjustment of the sound
emission sound, the control unit 111 instructs the sound emission control unit 114 to perform
sound emission control for volume adjustment. When the control unit 111 receives a microphone
mute operation input, the control unit 111 instructs the sound collection beam combining unit
117 to stop the output of the sound collection beam signal MB, and blinks the microphone mute
operation element.
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[0032]
In addition, the control unit 111 acquires the sound emission directivity information from the
sound emission voice signal with the sound emission directivity information input from the input
/ output I / F 113, and gives the sound emission directivity instruction to the sound emission
control unit 114. .
[0033]
Further, the control unit 111 determines the sound collection directivity and the output sound
signal based on the values (rotation amounts) of the rotation detection signals from the rotary
encoders 1121 and 1122, and forms the sound collection directivity. The sound directivity
instruction is given to the sound collection beam forming unit 116.
Further, the control unit 111 gives an output sound signal instruction to cause the sound
collection beam synthesis unit 117 to selectively obtain the output sound signal. Every time the
control unit 111 detects a change in the amount of rotation (detects the rotation of the subhousings 11 and 12), it determines the sound collection directivity and the output audio signal
according to the detected amount of rotation. The sound collection directivity instruction is
provided to the sound collection beam forming unit 116, and the output sound signal instruction
is supplied to the sound collection beam combining unit 117. The details of the sound collection
control based on the amount of rotation of the sub-housings 11 and 12 with respect to the main
housing 10 will be described later.
[0034]
The input / output I / F 113 is configured as described above, and is connected to the PC via a
USB cable in the present embodiment. The input / output I / F 113 receives the emitted sound
signal and transmits the collected beam signal MB. When the input / output I / F 113 receives
the emitted directivity information as well as the emitted voice signal, the input / output I / F
113 gives the emitted directivity information to the control unit 111, and outputs the emitted
voice signal to the emitted control unit 114 via the echo canceller 118. give. The input / output I
/ F 113 transmits and receives various control signals between the control unit 111 and the PC.
[0035]
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The sound emission control unit 114 gives individual sound emission to each of the two speakers
SP based on the sound emission sound signal acquired via the input / output I / F 113 and the
sound emission directivity instruction from the control unit 111. Generate a drive signal.
Specifically, the sound emission control unit 114 generates an individual sound emission drive
signal subjected to signal processing to realize monaural reproduction, stereo dipole
reproduction, and the like, and outputs the signal to the two speakers SP. At this time, the sound
emission control unit 114 performs signal level control of the individual sound emission drive
signal according to the sound emission control instruction of volume adjustment.
[0036]
The two speakers SP are disposed at the previously set intervals as described above, and emit the
sound according to the individual sound emission drive signal. The distance between the two
speakers SP and the individual sound emission drive signal given to each of them are set in
advance to function as a stereo speaker, and stereo sound emission is realized under these
conditions.
[0037]
The four microphones MIC of the microphone array 1150 pick up the sound from the outside of
the side wall of the main case 10 in the front direction to generate a pick-up signal. The four
microphones MIC of the microphone array 1151 pick up sound from the outside of the
microphone installation surface of the sub case 11 to generate a collected signal, and the four
microphones MIC of the microphone array 1152 form the sub case The sound from the outside
of the microphone mounting surface of the body 12 is collected to generate a collected signal.
[0038]
The sound collection beam forming unit 116 performs delay processing and addition processing
based on sound collection directivity instructions given from the control unit 111 on the sound
collection signals of the microphones MIC of the microphone arrays 1150 to 1152. The collected
sound beam signals MB <b> 10 to MB <b> 12 are formed and output to the collected sound beam
synthesis unit 117.
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[0039]
When the sound collection beam signals MB10 to MB12 are input from the sound collection
beam forming unit 116, the sound collection beam synthesizing unit 117 outputs the sound
collection beam signal based on the output audio signal instruction given from the control unit
111. Choose
Also, the sound collection beam synthesizing unit 117 performs phase control on the selected
sound collection beam signal, adds them to form a sound collection beam signal MB, and outputs
the sound collection beam signal MB to the echo canceller 118.
[0040]
The echo canceller 118 comprises an adaptive filter and a post processor that includes an adder.
The adaptive filter generates a pseudo-regression sound signal based on the emitted speech
signal to provide the pseudo-regression sound signal to the post processor adder. The adder of
the post processor cancels the echo by subtracting the pseudo-regression sound signal from the
sound collection beam signal MB, and outputs the result to the input / output I / F 113. At this
time, the post processor feeds back the output result to the adaptive filter.
[0041]
Next, details of the sound collection control based on the amount of rotation of the sub-housings
11 and 12 with respect to the main housing 10 will be described with reference to FIGS. FIG. 3 is
a diagram showing an example of seating around the sound emitting and collecting apparatus.
FIG. 4 is a view showing an example in which a plurality of people are seated at the front of the
sound emission and collection device. FIG. 5 is a diagram showing an example in which one
person is seated at the front of the sound emission and collection device.
[0042]
First, the sound collection direction of the sound collection beam signals MB10 to MB12 will be
described in detail. As shown in FIGS. 3 to 5, the collected sound beam signal MB10 includes at
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least one collected sound beam signal of the collected sound beam signals MB10A to MB10C.
The sound collection direction of the sound collection beam signal MB10A is perpendicular to
the microphone array 1150, and the sound collection direction of the sound collection beam
signal MB10B is clockwise with respect to the sound collection direction of the sound collection
beam signal MB10A. It is a direction inclined 45 degrees. The sound collection direction of the
sound collection beam signal MB10C is a direction inclined 45 degrees in the counterclockwise
direction with respect to the sound collection direction of the sound collection beam signal
MB10A.
[0043]
Also, the collected beam signal MB11 includes at least one collected beam signal of the collected
beam signals MB11A to MB11C, and the collected beam signal MB12 includes at least one
collected beam signal of the collected beam signals MB12A to MB12C. Including. The sound
collection directions of the collected sound beam signals MB11A and MB12A are perpendicular
to the microphone arrays 1151 and 1152, respectively, and the sound collection directions of the
collected sound beam signals MB11B and MB12B are collected The directions are respectively
inclined 45 degrees clockwise with respect to the sound direction. The sound collection direction
of the collected sound beam signals MB11C and MB12C is a direction inclined 45 degrees in the
counterclockwise direction with respect to the sound collection direction of the collected sound
beam signals MB11A and MB12A.
[0044]
Hereinafter, the sound collection control will be described. As shown in FIG. 3, a rotational state
in which all sides in the long side direction of the sub-housings 11 and 12 abut the main housing
10 (a state where the sound collection range is all directions using the microphone arrays 1150
to 1152, In the case where the amount of rotation is 0 degrees), the surroundings of the sound
emission and collection device 1 can be picked up evenly, so it is suitable for a usage mode in
which a plurality of users 200 to 202 sit around the sound emission and collection device 1 It is.
In this case, the sound collection beam forming unit 116 and the sound collection beam
combining unit 117 perform the following first processing.
[0045]
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The sound collection beam forming unit 116 forms sound collection beam signals MB10A to
MB10C based on the sound collection signal collected by the microphone array 1150 of the main
housing 10. Also, the sound collection beam forming unit 116 forms the sound collection beam
signals MB11A to MB11C based on the sound collection signal collected by the microphone
array 1151 of the sub case 11. Furthermore, the sound collection beam forming unit 116 forms
the sound collection beam signals MB12A to MB12C based on the sound collection signal
collected by the microphone array 1152 of the sub case 12. Then, the sound collection beam
synthesizing unit 117 performs phase control according to the rotation angle on the sound
collection beam signals MB10A to MB10C, MB11A to MB11C, and MB12A to MB12C, and then
adds them to obtain the sound collection beam signal MB. Form.
[0046]
Specifically, the sound collection beam synthesizing unit 117 shifts the phase of the sound
collection beam signal MB11A from the sound collection beam signal MB10A by a phase
difference equal to the angular difference between the microphone array 1150 and the
microphone array 1151. Similarly, the phases of the collected sound beam signals MB11B and
MB11C are shifted from the collected sound beam signals MB10B and MB10C by a phase
difference equal to the angular difference between the microphone array 1150 and the
microphone array 1151, respectively. Further, the phase of the collected beam signal MB12A is
shifted with respect to the collected beam signal MB10A by a phase difference equal to the
angular difference between the microphone array 1150 and the microphone array 1152.
Similarly, the phases of the collected sound beam signals MB12B and MB12C are shifted from
the collected sound beam signals MB10B and MB10C by a phase difference equal to the angular
difference between the microphone array 1150 and the microphone array 1152, respectively.
Then, the collected sound beam signals MB10A to MB10C, MB11A to MB11C, and MB12A to
MB12C are added. As described above, by shifting the phase by the same angle as the
microphone arrays 1151 and 1152 with respect to the microphone array 1150, the sound
emission and collection device 1 evenly collects sound from the entire periphery of the housing
and each microphone array 115 to 1152. It is possible to remove the emitted sound signal from
the speaker SP picked up.
[0047]
As shown in FIG. 4, in the rotational state in which the sides in the long side direction of the subhousings 11 and 12 are not in contact with the main housing 10, between the rotational states
parallel to the front direction side wall of the main housing 10. (When the amount of rotation is
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more than 0 degrees and not more than 120 degrees), a display is installed on the back side of
the side wall of the main case 10 in the front direction, and a plurality of persons are installed on
the side of the side wall of the main case 10 in the front direction. It is suitable for the use mode
in which the users 200 to 202 are seated. In this case, the sound collection beam forming unit
116 and the sound collection beam combining unit 117 perform the following second
processing.
[0048]
The sound collection beam forming unit 116 forms sound collection beam signals MB10A to
MB10C based on the sound collection signal collected by the microphone array 1150 of the main
housing 10. Also, the sound collection beam forming unit 116 forms the sound collection beam
signals MB11A and MB11B based on the sound collection signal collected by the microphone
array 1151 of the sub-housing 11. Furthermore, the sound collection beam forming unit 116
forms the sound collection beam signals MB12A and MB12C based on the sound collection
signal collected by the microphone array 1152 of the sub case 12. The sound collection beam
synthesizing unit 117 performs phase control according to the rotation angle on the sound
collection beam signals MB10A to MB10C, MB11A, MB11B, MB12A, and MB12C, and then adds
them to obtain the sound collection beam signal MB. Form. As described above, in this usage
mode, the sound emission and collection device 1 does not collect the sound signal from the
direction in which the user would not be seated, and thus the sound emission sound signal of the
speaker is not collected as much as possible. , And the influence of the emitted sound signal from
the speaker SP can be suppressed.
[0049]
As shown in FIG. 5, the sides in the long side direction of the sub-housings 11 and 12 exceed the
pivoting state parallel to the front-side side wall of the main housing 10, and the main-housing
side In the rotation state (when the amount of rotation exceeds 120 degrees) which protrudes in
the front direction of 10, it is suitable for the use mode in which one user 200 is seated on the
front direction side of the front direction side wall of the main housing 10. In this case, the sound
collection beam forming unit 116 and the sound collection beam combining unit 117 perform
the following third processing.
[0050]
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The sound collection beam forming unit 116 forms sound collection beam signals MB10A to
MB10C based on the sound collection signal collected by the microphone array 1150 of the main
housing 10. Also, the sound collection beam forming unit 116 forms the sound collection beam
signals MB11A and MB11B based on the sound collection signal collected by the microphone
array 1151 of the sub-housing 11. Furthermore, the sound collection beam forming unit 116
forms the sound collection beam signals MB12A and MB12C based on the sound collection
signal collected by the microphone array 1152 of the sub case 12. Then, the sound collection
beam synthesizing unit 117 performs phase control according to the rotation angle on the sound
collection beam signals MB11A, MB11B, MB12A, and MB12C, and then adds them to form a
sound collection beam signal MB. As described above, since the sound emission and collection
device 1 does not add the sound collection beam signal collected by the microphone array 1150
of the main housing 10 that can most easily collect the sound emission sound signal from the
speaker, The influence of the emitted sound signal can be suppressed. In this usage mode, the
sound collection beam forming unit 116 forms the sound collection beam signals MB10A to
MB10C based on the sound collection signal collected by the microphone array 1150 of the main
housing 10, but does not form it. It is also good.
[0051]
As described above, the sound emission and collection device 1 can easily change the sound
collection range simply by rotating the sub-housings 11 and 12, and changes the sound
collection range according to the use case of the user. be able to. In addition, since the sound
emission and collection device 1 can perform sound collection control according to the usage
mode, and can suppress the sound emission voice signal from the speaker SP collected by each of
the microphone arrays 115 to 1152, the echo canceler 118 Load can be reduced.
[0052]
In the present embodiment, the control unit 111 determines the sound collection directivity and
the output sound signal based on the amount of rotation from the rotary encoders 1121 and
1122. However, the control unit 111 may output the amount of rotation to the PC, and
determine the sound collection directivity and the output audio signal on the PC side. Thereby,
the load of the sound emission and collection device 1 can be reduced.
[0053]
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In the present embodiment, the rotary encoders 1121 and 1122 are used to detect the amount of
rotation. However, as long as the displacement of the sub-housing relative to the main housing
10 can be detected, other means may be used.
[0054]
In addition, in this embodiment, collected sound beam signals MB10A to MB10C, MB11A to
MB11C, and MB12A to MB12C are formed. However, the number of collected sound beam
signals is not limited to this, and may be appropriately designed according to the specification.
For example, the microphone array 1150 of the main housing 10 collects sound in a direction
perpendicular to the sound collection beam signal MB10A in a direction perpendicular to the
microphone array and 30 degrees clockwise with respect to the sound collection direction of the
sound collection beam signal MB10A. Beam signal, a collected beam signal in a direction inclined
60 degrees clockwise with respect to the sound collection direction of the collected beam signal
MB10A, and inclined 30 degrees counterclockwise with respect to the collected direction in
collected beam signal MB10A A sound collection beam signal in the direction described above
and a sound collection beam signal in a direction inclined 60 degrees counterclockwise with
respect to the sound collection direction of the sound collection beam signal MB10A may be
formed.
[0055]
Further, in the present embodiment, the sound emission and collection device 1 including the
speaker SP has been described as an example, but it may be a sound collection device not
including the speaker SP. In this case, a speaker device may be externally connected to the sound
collection device. Further, when only the sound collecting function is used, the speaker device is
unnecessary.
[0056]
The sound emission and collection device 2 according to another embodiment will be described
with reference to FIGS. 6 to 8. FIG. 6 is a view showing an example of sitting around the sound
emitting and collecting apparatus. FIG. 7 is a view showing an example in which a plurality of
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people are seated at the front of the sound emission and collection device. FIG. 8 is a diagram
showing an example in which one person is seated at the front of the sound emission and
collection device. The sound emission and collection device 2 differs from the sound emission
and collection device 1 in that the shape of the main housing 10 ′ is substantially elliptical in
plan view. Hereinafter, only differences from the sound emission and collection device 1 will be
described.
[0057]
As shown in FIG. 6, the main housing 10 ′ of the sound emission and collection device 2 has an
elliptic cylindrical shape. The sound emission and collection device 2 includes four microphone
arrays 1150 on the inside in the front direction side wall of the main housing 10 ′ (side wall
having a wall surface downward in FIG. 6, outer peripheral side wall parallel to the long axis of
the ellipse). The microphone MIC is placed with the direction facing outward from the front side
wall as the sound collection direction. Four microphones MIC are arranged parallel to the major
axis of the ellipse.
[0058]
The sound emission and collection device 2 has two speakers SP installed parallel to the front
direction side wall inside the vicinity of the approximate center of an ellipse of the main housing
10 'in plan view. The speaker SP is installed such that the direction from the upper surface (the
surface viewed in plan in FIG. 6) of the main housing 10 'to the outside is the sound output
direction.
[0059]
The sound emission and collection device 2 has an operation unit 110 including a plurality of
operation elements installed on the upper surface of the main housing 10 '. The plurality of
operators are arranged in parallel to the major axis of the ellipse.
[0060]
The sound emission and collection device 2 is provided with rotational connection parts 13A and
13B with the sub-housings 11 and 12 at both ends of the microphone array 1150 of the main
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housing 10 ′, and the rotational connection parts 13A and 13B are rotated. As the center, the
sub-housings 11 and 12 rotate with respect to the main housing 10 ′.
[0061]
The basic posture of the sound emission and collection device 2 is, as shown in FIG. 6, turned in a
direction in which the sub-housings 11 and 12 are directed inward from the upper surface of the
main housing 10 ′, and can not be further rotated It becomes a state.
At this time, the ends of the sub-housings 11 and 12 (the ends not connected to the main
housing 10 ′) are closest to each other.
[0062]
The sound emission and collection device 2 generates the sound collection beam signal MB as
follows according to the amount of rotation of the sub-housings 11 and 12. In the basic posture
of the sound emission and collection device 2 (a state in which all directions are set as the sound
collection range using the microphone arrays 1150 to 1152, when the amount of rotation is 0
degrees), sound is collected evenly around the sound emission and collection device 2 Since it
can be, it is suitable for the use mode in which a plurality of users 200 to 202 sit around the
sound emitting and collecting apparatus. In this case, the sound collection beam forming unit
116 and the sound collection beam combining unit 117 perform the first process described
above.
[0063]
As shown in FIG. 7, the sides in the long side direction of the sub case 11 and the sub case 12 are
parallel to the front direction side wall (the side on which the microphone array 1150 is
installed) of the sub case 11 and the sub case 12 except the basic posture. In the rotating state
(when the amount of rotation is more than 0 degrees and not more than 120 degrees), the
display is installed on the back side of the side wall in the front direction of the main housing 10
', and the side wall in the front direction of the main housing 10' It is suitable for a use mode in
which a plurality of users 200 to 202 are seated on the front direction side of. In this case, the
sound collection beam forming unit 116 and the sound collection beam combining unit 117
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perform the second process described above.
[0064]
As shown in FIG. 8, the sides in the long side direction of the sub-housings 11 and 12 exceed the
rotation state parallel to the front direction side wall of the main case 10 ′, and the side of the
main case 10 ′ In a rotating state (in the case where the amount of rotation exceeds 120
degrees) projecting in the front direction of the housing 10 ′, it is suitable for a use mode in
which one user 200 is seated on the front direction side of the front direction side wall of the
main housing 10 ′. It is. In this case, the sound collection beam forming unit 116 and the sound
collection beam synthesis unit 117 perform the third process described above.
[0065]
As described above, since the sound emission and collection device 2 can perform sound
collection control according to the usage mode, and can suppress the sound emission voice signal
from the speaker SP collected by each of the microphone arrays 1150 to 1152, The load on the
echo canceller 118 can be reduced.
[0066]
In the embodiment described above, the main housing 10 ′ has a substantially elliptical shape
in plan view, but may have a substantially circular shape.
[0067]
The sound emission and collection device 3 according to another embodiment will be described
with reference to FIGS. 9 to 11.
FIG. 9 is a diagram showing an example of seating around the sound emitting and collecting
device.
FIG. 10 is a diagram showing an example in which a plurality of people are seated at the front of
the sound emission and collection device. FIG. 11 is a view showing an example in which one
person is seated at the front of the sound emission and collection device. The sound emission and
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collection device 3 differs from the sound emission and collection device 1 in that the shape of
the main housing 10 ′ ′ is rectangular in plan view, and four microphone arrays are provided.
Hereinafter, only differences from the sound emission and collection device 1 will be described.
[0068]
As shown in FIG. 9, the main housing 10 ′ ′ of the sound emission and collection device 3 has
a rectangular shape in plan view and a rectangular parallelepiped shape having a predetermined
thickness. The sound emission and collection device 3 has the four microphones MICs of the
microphone array 1150 outward from the side wall in the front direction on the inner side wall
(side wall having a downward wall surface in FIG. 9) of the main housing 10 ′ ′. Install the four
microphone MICs of the microphone array 1153 from the back direction side wall on the inside
of the back direction side wall (side wall having the wall surface upward in FIG. 9) of the main
housing 10 ′ ′. Set the direction facing outward as the sound collection direction.
[0069]
The sound emission and collection device 3 has two speakers SP installed parallel to the front
direction side wall inside the vicinity of the approximate center of a rectangular shape of the
main housing 10 ′ ′ in plan view.
[0070]
The sound emission and collection device 3 has an operation unit 110 including a plurality of
operators on the upper surface (the surface viewed in plan in FIG. 9) of the main housing 10 ′
′.
The plurality of operators are arranged in parallel to the front side wall as shown in FIG.
[0071]
The sound emission and collection device 3 is provided with rotational connection portions 13A
and 13B with the sub-housings 11 and 12 respectively at portions corresponding to the corners
of both ends of the front direction side wall of the main housing 10 ′ ′, and the rotational
connection The sub-housings 11 and 12 rotate with respect to the main housing 10 ′ ′ with
the portions 13A and 13B as rotation centers.
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[0072]
The basic posture of the sound emission and collection device 3 is, as shown in FIG. 9, turned in
the direction in which the sub-housings 11 and 12 are directed inward from the upper surface of
the main housing 10 ′ ′. It becomes impossible state.
At this time, an angle between each of the sub-housings 11 and 12 and the side wall in the front
direction of the main housing 10 '' is 90 degrees. The end (the end not connected to the main
housing 10 ′ ′) of each of the sub housings 11 and 12 is closest to both ends of the
microphone array 1153 of the main housing 10 ′ ′.
[0073]
The sound emission and collection device 3 generates the sound collection beam signal MB as
follows according to the amount of rotation of the sub-housings 11 and 12. In the basic posture
(a state in which all directions are set as a sound collection range using the microphone arrays
1150 to 1153, when the amount of rotation is 0 degrees), since the surroundings of the sound
emission and collection device 2 can be collected uniformly, sound is emitted It is suitable for a
use mode in which a plurality of users 200 to 203 are seated around the sound collection device.
[0074]
In this case, the sound collection beam forming unit 116 forms the sound collection beam signals
MB10A to MB10C based on the sound collection signal collected by the microphone array 1150
of the main housing 10 ''. The sound collection beam forming unit 116 forms the sound
collection beam signals MB11A to MB11C based on the sound collection signal collected by the
microphone array 1151 of the sub case 11. The sound collection beam forming unit 116 forms
the sound collection beam signals MB12A to MB12C based on the sound collection signal
collected by the microphone array 1152 of the sub case 12. The sound collection beam forming
unit 116 forms the sound collection beam signals MB13A to MB13C based on the sound
collection signal collected by the microphone array 1153 of the main housing 10 ''. Then, the
sound collection beam synthesizing unit 117 performs phase control according to the rotation
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angle with respect to the sound collection beam signals MB10A to MB10C, MB11A to MB11C,
MB12A to MB12C, and MB13A to MB13C, and then adds them. Form a beam signal MB. As a
result, the sound emission and collection device 3 can uniformly collect sound from the entire
periphery of the casing, and can remove the sound emission sound signal from the speaker SP
collected by each of the microphone arrays 1150-1153.
[0075]
As shown in FIG. 10, the sides in the long side direction of the sub-housing 11 and the subhousing 12 are parallel to the front direction side wall (the side on which the microphone array
1150 is installed) of the main housing 10 '' except the basic posture. In the normal rotation state
(when the rotation amount exceeds 0 degrees and is 90 degrees or less), the display is installed
on the back direction side of the front direction side wall of the main housing 10 ′ ′ It is
suitable for a use mode in which a plurality of users 200 to 202 are seated on the front direction
side of the front direction side wall. In this case, the sound collection beam forming unit 116 and
the sound collection beam combining unit 117 perform the second process described above.
Note that since the sound collection beam synthesizing unit 117 does not add the sound
collection beam signals MB13A to MB13C based on the sound collection signals collected by the
microphone array 1153 of the main housing 10 ′ ′, the sound collection beam forming unit
116 collects The sound beam signals MB13A to MB13C may not be formed.
[0076]
As shown in FIG. 11, the sides in the long side direction of the sub-housings 11 and 12 exceed
the rotational state parallel to the front-side side wall of the main housing 10 ′ ′, and the
front-side side wall of the main housing 10 ′ ′ In a rotating state (in the case where the
amount of rotation exceeds 90 degrees) projecting further in the front direction of the main
housing 10 '', one user 200 is seated on the front direction side of the front direction side wall of
the main housing 10 ''. It is suitable for the mode of use. In this case, the sound collection beam
forming unit 116 and the sound collection beam synthesis unit 117 perform the third process
described above. Note that since the sound collection beam synthesizing unit 117 does not add
the sound collection beam signals MB13A to MB13C based on the sound collection signals
collected by the microphone array 1153 of the main housing 10 ′ ′, the sound collection beam
forming unit 116 collects The sound beam signals MB13A to MB13C may not be formed.
[0077]
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As described above, since the sound emission and collection device 3 can perform sound
collection control according to the usage mode, and can suppress the sound emission voice signal
from the speaker SP collected by each of the microphone arrays 1150 to 1153, The load on the
echo canceller 118 can be reduced.
[0078]
In the above embodiment, the main housing 10 ′ ′ has a square shape in plan view, but may
have a substantially polygonal shape.
[0079]
1-3 ... sound emitting and collecting apparatus, 10, 10 ', 10' '... main housing, 11, 12 ... subhousing, 13A, 13B ... pivot connection unit, 110 ... operating unit, 111 ... controller, 113 ... input /
output I / F, 114 ... sound emission control unit, 116 ... sound collection beam forming unit, 117
... sound collection beam combining unit, 118 ... echo canceler, 200 to 203 ... user, 1121, 1122 ...
rotary encoder, 1150 1153: Microphone array, MB, MB10A to MB10C, MB11A to MB11C,
MB12A to MB12C, MB13A to MB13C: sound collecting beam signal, MIC: microphone, SP:
speaker
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