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JP2007318373

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DESCRIPTION JP2007318373
To transmit voice signals obtained by a plurality of microphones provided in a moving body
whose direction is changed to a sound source separation device, the plurality of microphones
used for input of audio signals to be processed by the sound source separation device Being able
to prevent the direction of the sound source from changing. SOLUTION: Eight input audio signals
obtained by eight or more microphones 1L to 4L, 1R to 4R arranged around a reference axis M0
based on a detection result of the gyro sensor 10a (direction of the microphone unit 20a) Of
these two signals, part of the two signals are selected and transmitted to the sound source
separation processing unit 31, and control is performed so that the directions of the sound
sources present for the selected microphones do not change. [Selected figure] Figure 1
Voice input device, sound source separation device
[0001]
The present invention relates to a voice input device including a plurality of microphones for
inputting voice in a predetermined acoustic space and transmitting voice signals obtained by the
microphones to a predetermined sound source separation device, and a sound source separation
device including the same. is there.
[0002]
When a plurality of sound sources and a plurality of microphones (voice input means) exist in a
predetermined acoustic space, individual voice signals (hereinafter referred to as sound source
signals) from each of the plurality of sound sources are superimposed for each of the plurality of
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microphones. An audio signal (hereinafter referred to as a mixed audio signal) is input.
The method of sound source separation processing for identifying (separating) each of the sound
source signals based only on the plurality of mixed speech signals input in this manner is called a
blind source separation method (hereinafter referred to as BSS method). It is called. Furthermore,
as one of the sound source separation processes of the BSS system, there is a sound source
separation process of the BSS system based on Independent Component Analysis (hereinafter
referred to as ICA method). In the BSS system based on the ICA method, predetermined
separation is performed on the plurality of mixed voice signals (time-series voice signals) input
through a plurality of microphones, using statistical independence of the sound source signals. It
is a processing method which performs identification (source separation) of the sound source
signal by optimizing a matrix (inverse mixing matrix) and applying a filtering process to the
plurality of input mixed speech signals by the optimized separation matrix. . At that time,
optimization of the separation matrix is used subsequently by sequential calculation (learning
calculation) based on the signal (separated signal) identified (separated) by filtering using the
separation matrix set at a certain point in time It is done by computing the separation matrix.
Here, according to the sound source separation processing of the BSS system based on the ICA
method, each of the separated signals has the same number of output terminals (may be referred
to as output channels) as the number of inputs of the mixed speech signal (= the number of
microphones). Output through Such sound source separation processing of the BSS system based
on the ICA method is described in detail in, for example, Non-Patent Document 1, Non-Patent
Document 2, and the like. Further, as the blind sound source separation processing, a binaural
blind source separation processing is also known. This is to perform sound source separation by
performing time-varying gain adjustment on a plurality of input audio signals based on a human
auditory model, and is sound source separation processing that can be realized with a relatively
low calculation load. This is described in detail in, for example, Non-Patent Document 3 and NonPatent Document 4 and the like. One of the binaural blind source separation processes is blind
source separation processing using a binary mask method. Hiromu Saruwatari, "Basics of blind
source separation using array signal processing", Technical Report of IEICE. EA 2001-7, pp. 4956, April 2001. Tomoya Takatani et al., "High-fidelity blind source separation using ICA based on
SIMO model" IEICE Technical Report, vol. US 2002-87, EA 2002-108, January 2003.
R. F. Lyon, "A computational model of binaural localization and separation," In Proc. ICASSP,
1983. M. Bodden, "Modeling human sound-source localization and the cocktail-party-effect," Acta
Acoustica, vol. 1, pp. 43-55, 1993.
[0003]
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2
By the way, in the sound source separation processing of the BSS method based on the ICA
method and the blind sound source separation processing of the binaural method, the directions
of the plurality of sound sources with respect to the microphones When it is replaced, the
separated signal output to each of the output terminals (output channels) is also replaced
accordingly. For this reason, when a plurality of microphones for inputting mixed speech signals
to be processed by the sound source separation apparatus are provided on a moving object such
as an operator or robot whose direction changes in the acoustic space, the sound source
separation apparatus specifies There has been the problem of tracking the sound source, that is,
it is not possible to ensure that the separated signal corresponding to a specific sound source is
output through a specific output. Accordingly, the present invention has been made in view of
the above circumstances, and the object of the present invention is to provide a plurality of
microphones on a moving body whose direction changes in an acoustic space, and to obtain
audio signals (mixed audio A voice input device capable of preventing the directions of presence
of sound sources for a plurality of microphones used for input of an audio signal to be processed
by the sound source separation device when transmitting the signal) to the sound source
separation device; To provide a sound source separation device.
[0004]
In order to achieve the above object, the present invention is applied to a voice input device
including a plurality of microphones for inputting voice in a predetermined acoustic space and
transmitting a voice signal obtained by the microphone to a predetermined sound source
separation device. It is configured as a voice input device according to the first invention or a
voice input device according to the second invention. Here, the first invention is characterized by
including the components shown in the following (1-1) to (1-3). (1-1) A first microphone unit
having a support that supports three or more microphones and a predetermined position around
a predetermined reference axis. (1-2) First direction detection means for detecting the direction
of the first microphone unit when the reference axis is the rotation center. (1-3) Based on the
detection result of the first direction detection means, a plurality of partial signals among the
three or more input audio signals obtained by the three or more microphones are selected to be
selected Signal selection means for transmission to the sound source separation device. The
second invention is characterized by comprising the following components (2-1) to (2-4). (2-1) A
second microphone unit having a plurality of microphones and a support portion for supporting
these at predetermined positions around a predetermined reference axis. (2-2) A rotational drive
unit that rotationally drives the second microphone unit around the reference axis. (2-3) A
second direction detection unit that detects the direction of the portion that rotatably supports
the second microphone unit or the direction of the second microphone unit when the reference
axis is the rotation center. (2-4) Orientation adjustment means for adjusting the orientation of the
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second microphone unit by controlling the rotational drive means based on the detection result
of the second direction detection means. Here, as the first direction detecting means and the
second direction detecting means, for example, those in which a rotation angle with respect to a
predetermined reference direction is detected by a gyro sensor can be considered. According to
the first aspect of the invention, when the first microphone unit is rotated about the reference
axis and its direction is changed, an audio signal to be transmitted to the sound source separation
device (that is, the sound source separation device is a processing target It is possible to select a
plurality of microphones used for inputting an audio signal) such that the directions of the sound
sources with respect to the microphones are not interchanged. Further, according to the second
invention, even when the portion for rotatably supporting the second microphone unit rotates
about the reference axis, the second microphone unit is oriented in a predetermined direction. It
can hold.
Therefore, according to the first invention or the second invention, a plurality of microphones are
provided in a moving body whose direction changes in an acoustic space, and a sound source
separation device is provided for audio signals (mixed audio signals) obtained by the plurality of
microphones. In the case of transmission to the above, it is possible to prevent the directions of
the sound sources from being interchanged with respect to a plurality of microphones used for
inputting the audio signal to be processed by the sound source separation apparatus. The present
invention also includes the voice input device according to the first or second invention described
above, and the voice input device is arranged from a plurality of voice signals transmitted from
the voice input device. It can also be understood as a sound source separation device that
generates separated signals corresponding to one or more sound sources present in the acoustic
space. As such a sound source separation device, for example, a sound source separation device
that performs blind sound source separation processing based on an independent component
analysis method, a sound source separation device that performs blind sound source separation
processing by a binary mask method, and the like can be considered.
[0005]
According to the present invention, when a plurality of microphones are provided on a moving
body whose direction changes in an acoustic space and sound signals (mixed sound signals)
obtained by the plurality of microphones are transmitted to the sound source separation device,
the sound source separation device It is possible to prevent the directions of the sound sources
from being interchanged with respect to a plurality of microphones used for inputting an audio
signal to be processed.
[0006]
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4
Hereinafter, embodiments of the present invention will be described with reference to the
accompanying drawings for understanding of the present invention.
The following embodiment is an example embodying the present invention, and is not of the
nature to limit the technical scope of the present invention. 1 is a block diagram showing a
schematic configuration of the sound source separation device X1 according to the first
embodiment of the present invention, FIG. 2 is a schematic external view of the sound source
separation device X1, and FIG. 3 is a microphone unit provided in the sound source separation
device X1. FIG. 4 is a plan view of the microphone unit for explaining the selection process of the
microphone according to the direction of the microphone unit in the sound source separation
apparatus X1. FIG. 5 is a sound source separation apparatus X2 according to the second
embodiment of the present invention. FIG. 6 is a plan view of a microphone unit for explaining
rotation control of the microphone unit in the sound source separation device X2.
[0007]
First Embodiment First, the configuration of a sound source separation device X1 according to a
first embodiment of the present invention will be described with reference to FIGS. 1 to 3. As
shown in FIG. 1, the sound source separation device X1 is provided with eight (three or more
examples) microphones (hereinafter referred to as microphones) 1L to 4L and 1R to 4R for
inputting voice in a predetermined acoustic space. The microphone unit 20a, the control unit
30a, and the gyro sensor 10a are provided. Further, the control unit 30a is provided with a
sound source separation processing unit 31, an MPU 32a and a multiplexer 33a. Then, the sound
source separation device X1 transmits two (plurality) of the audio signals obtained by the
plurality of microphones 1L to 4L and 1R to 4R to two input channels In1 of the sound source
separation processing unit 31 via the multiplexer 33a. , In2 (signal input end), and from the
audio signals input to the two input channels In1 and In2, to two sound sources existing in the
acoustic space in which the plurality of microphones 1L to 4L and 1R to 4R are arranged. The
corresponding separation signal is generated (identified) and output through the output channels
Out1 and Out2 (signal output end). In the example shown in FIG. 1, the separated signal output
through one output channel Out1 is output to the speaker 40. The input sound signals to the
plurality of input channels In1 and In2 are mixed sound signals on which signals of a plurality of
sound sources (sound source signals) are superimposed. Then, the sound source separation
processing unit 31 executes the blind sound source separation processing based on the input
sound signals to each of the plurality of input channels In1 and In2 to obtain a plurality of sound
source signals superimposed on each input sound signal (here In the above, two sound source
signals are identified, and the identified signals are output as separated signals. Here, as the blind
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sound source separation processing performed by the sound source separation processing unit
31, as described above, sound source separation processing of the BSS method based on the ICA
method, blind sound source separation processing by the binary mask method, etc. can be
considered. The details of the respective processes are described in detail in Non-Patent
Documents 1 to 4 described above, and thus the description thereof is omitted here.
[0008]
As shown in FIG. 3, the microphone unit 20a includes eight microphones 1L to 4L and 1R to 4R
and a support portion 21a which supports them in a range of 360 ° around a predetermined
reference axis M0. Are configured (an example of a first microphone unit). In the example shown
in FIG. 3, eight microphones 1L to 4L and 1R to 4R are formed at equal intervals along the
circumference centered on the reference axis M0 (formed by the arrangement position of the
adjacent microphones and the reference axis M0 They are arranged at intervals of a central angle
of 45 °. In the example shown in FIG. 3, the microphone 3L, the microphone 2L, the microphone
1L, the microphone 4R, etc. are located at intervals of 0 ° to 45 ° counterclockwise around the
reference axis M0 with respect to the front direction D1 of the microphone unit 20a. A
microphone 3R, a microphone 2R, a microphone 1R, and a microphone 4L are disposed. The
microphone unit 20a, the gyro sensor 10a, the MPU 32a, and the multiplexer 33a constitute an
example of the voice input device according to the first invention.
[0009]
As in the plan view (a) and the side view (b) shown in FIG. 2, the sound source separation device
X1 is mounted on a wearing tool 50 such as a helmet or a hat worn by a worker. It rotates
according to the rotation. Here, the sound source separation device X1 is attached to the wearing
tool 50 such that the reference axis M0 substantially coincides with the rotation axis of the
wearing tool 50. The gyro sensor 10a is a sensor that detects, for example, the rotation angle of
one axis according to the principle of the gyroscope, and detects the direction of the microphone
unit 20a when the reference axis M0 is the rotation center (first direction detection means An
example of Specifically, the direction of the front direction D1 of the microphone unit 20a when
the predetermined initialization process is performed is taken as a reference direction D0 (see
FIG. 4), and the angle of the front direction D1 of the microphone unit 20a with respect to the
reference direction D0 The (rotational angle with respect to the reference direction D0) is
detected as the direction (rotational angle) of the microphone unit 20a. The multiplexer 33a
selects two signals, which are a part of the eight input audio signals obtained by the eight
microphones 1L to 4L and 1R to 4R, and transmits the selected two signals to the sound source
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separation processing unit 31. Further, the MPU 32a performs initialization setting for setting
the reference direction D0 with respect to the gyro sensor 10a, and inputs a detection result
(direction of the microphone unit 20a) of the gyro sensor 10a, and a multiplexer based on the
detection result Of the eight input audio signals obtained by the eight microphones 1L to 4L and
1R to 4R by controlling 33a, control is performed to switch which two signals are transmitted to
the sound source separation processing unit 31. is there. The control is realized by the MPU 32a
executing a predetermined program. The multiplexer 33a and the MPU 32a are an example of
the signal selection unit.
[0010]
The control contents of the multiplexer 33a by the MPU 32a will be described below with
reference to FIG. Here, FIG. 4 shows a plan view of the microphone unit 20a for explaining
selection processing of the microphones 1L to 4L, 1R to 4R according to the direction of the
microphone unit 20a. The MPU 32a monitors the rotation angle ω of the microphone unit 20a
detected by the gyro sensor 10a (the angle of the front direction D1 of the microphone unit 20a
with respect to the reference direction D0), and according to the rotation angle ω, From which
two audio signals are selected and transmitted to the sound source separation processing unit 31
are controlled according to the following eight rules. The two input channels of the sound source
separation processing unit 31 are referred to as a first input channel In1 and a second input
channel In2.
[0011]
[Rule 1] When (0 ° ≦ ω <22.5) or (337.5 ° ≦ ω <360 °), the audio signal of the microphone
1L is input to the first input channel In1, and the audio signal of the microphone 1R is 2
Transmit to the input channel In2. The state at this time is shown in FIG. [Rule 2] If (22.5 ° ≦ ω
<67.5), the audio signal of the microphone 2L is transmitted to the first input channel In1, and
the audio signal of the microphone 2R is transmitted to the second input channel In2. The state
at this time is shown in FIG. [Rule 3] If (67.5 ° ≦ ω <112.5 °), the audio signal of the
microphone 3L is transmitted to the first input channel In1, and the audio signal of the
microphone 3R is transmitted to the second input channel In2. [Rule 4] If (112.5 ° ≦ ω <157.5
°), the audio signal of the microphone 4L is transmitted to the first input channel In1, and the
audio signal of the microphone 4R is transmitted to the second input channel In2. [Rule 5] If
(157.5 ° ≦ ω <202.5 °), the audio signal of the microphone 1R is transmitted to the first input
channel In1, and the audio signal of the microphone 1L is transmitted to the second input
channel In2. [Rule 6] If (202.5 ° ≦ ω <247.5 °), the audio signal of the microphone 2R is
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transmitted to the first input channel In1, and the audio signal of the microphone 2L is
transmitted to the second input channel In2. [Rule 7] If (247.5 ° ≦ ω <292.5 °), the audio
signal of the microphone 3R is transmitted to the first input channel In1, and the audio signal of
the microphone 3L is transmitted to the second input channel In2. [Rule 8] If (202.5 ° ≦ ω
<337.5 °), the audio signal of the microphone 4R is transmitted to the first input channel In1,
and the audio signal of the microphone 4L is transmitted to the second input channel In2. The
state at this time is shown in FIG. As described above, the MPU 32a selects the sound signal
obtained by the two microphones (1L and 1R, 2L and 2R, 3L and 3R, 4L and 4R) located on the
opposite sides to each other with respect to the reference axis M0. It is transmitted to the
separation processing unit 31.
[0012]
As described above, in the sound source separation device X1 that selects the sound signal, the
sound signal to be transmitted to the sound source separation processing unit 31 when the
microphone unit 20a rotates about the reference axis M0 and its direction changes. That is, two
microphones used for inputting the mixed audio signal to be processed by the sound source
separation apparatus are selected such that the directions of the sound sources (sound source 1
and sound source 2 in FIG. 4) with respect to the microphones do not change. As a result, the
worker who wears the wearing tool 50 to which the sound source separation device X1 is
attached separates and generates only the sound generated from a specific sound source through
the speaker 40, even when the direction to rotate is changed. The (extracted) voice can be
selectively listened to.
[0013]
Second Embodiment Next, the configuration of a sound source separation device X2 according to
a second embodiment of the present invention will be described with reference to the block
diagram shown in FIG. As shown in FIG. 5, the sound source separation device X2 includes a
microphone unit 20b provided with two microphones (hereinafter referred to as microphones)
1L and 1R for inputting voice in a predetermined acoustic space, a control unit 30b, and a gyro A
sensor 10 b and a motor 60 are provided. Further, the control unit 30b is provided with a sound
source separation processing unit 31, an MPU 32b, and a driver 33b for operating the motor 60.
Then, the sound source separation device X2 transmits two (plurality) audio signals obtained by
the two microphones 1L and 1R to each of the two input channels In1 and In2 of the sound
source separation processing unit 31, and the two input channels In1. , And In2 to generate
(identify) separated signals corresponding to the two sound sources present in the acoustic space
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in which the plurality of microphones 1L and 2R are disposed, and the separated signals are
output through the output channels Out1 and Out2. It is an output. In the example shown in FIG.
5, the separated signal output through one output channel Out1 is output to the speaker 40. The
input audio signal to each of the input channels In1 and In2 is a mixed audio signal on which
signals (sound source signals) of a plurality of sound sources are superimposed, and the sound
source separation processing unit 31 performs the sound source separation processing in the
sound source separation device X1 described above. It is the same as part 31. The microphone
unit 20b, the gyro sensor 10b, the MPU 32b, and the driver 33b constitute an example of the
voice input device according to the second invention.
[0014]
The microphone unit 20b is configured to include two microphones 1L and 1R and a support
portion 21b that supports these at predetermined positions around a predetermined reference
axis M (an example of a second microphone unit). In the example shown in FIG. 5, the two
microphones 1 </ b> L and 1 </ b> R are disposed at equidistant positions opposite to each other
with respect to the reference axis M. Hereinafter, a direction orthogonal to the arrangement
direction of the two microphones 1L and 1R, in which one microphone 1L is in the left direction
and the other microphone 1R is in the right direction, is referred to as a front direction of the
microphone unit 20b. In FIG. 5, the direction toward the paper surface is the front direction of
the microphone unit 20b. The motor 60 is constituted by, for example, a stepping motor etc., and
is a drive means for rotationally driving the microphone unit 20b about the reference axis M0
and stopping (adjusting the direction) in a desired direction (an example of the rotation drive
means ). The gyro sensor 10b is a sensor for detecting a rotation angle similar to the gyro sensor
10a in the sound source separation device X1 described above, and supports the microphone
unit 20b rotatably when the reference axis M0 is the rotation center (FIG. 5) In the example of
(1), the orientation of the main body of the motor 60 is detected (an example of the second
orientation detection means). Specifically, the direction of the front direction D2 (see FIG. 6) of
the main body of the motor 60 when the predetermined initialization process is performed is
taken as a reference direction D0 (see FIG. 6). The angle in the front direction D2 (rotational
angle with respect to the reference direction D0) is detected as the direction (rotational angle) of
the motor 60 main body. Here, in the example shown in FIG. 5, the motor 60 body (supporting
portion of the mac unit 20b), the gyro sensor 10b and the wearing tool 50 are connected and
fixed at the position of the reference axis M0, and the front direction D2 of the motor 60 body is
The front direction of the wearing tool 50 is set.
[0015]
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The driver 33b is a motor drive circuit that adjusts the rotation angle of the rotation shaft of the
motor 60, that is, the rotation angle of the microphone unit 20b supported by the rotation shaft
by operating the motor 60 according to a control command from the MPU 32b. . The MPU 32b
performs initialization setting for setting a predetermined reference direction D0 (see FIG. 6) to
the gyro sensor 10b, and detects the detection result of the gyro sensor 10b (the direction of the
support portion (motor 60 main body of the microphone unit 20b). ) And outputs a control
command to the driver 33b based on the detection result, thereby adjusting the direction of the
microphone unit 20b. That is, the MPU 32b controls the rotation angle of the rotation shaft of
the motor 60, that is, the direction of the microphone unit 20b through the driver 33b. The MPU
32 b and the driver 33 b are an example of the direction adjusting unit. As shown in FIG. 5, the
sound source separation device X2 is also mounted on a wearing tool 50 such as a helmet or a
hat worn by the operator, and the whole thereof rotates according to the rotation of the wearing
tool 50. Here, the sound source separation device X2 is attached to the wearing tool 50 such that
the reference axis M0 substantially coincides with the rotation axis of the wearing tool 50.
[0016]
Hereinafter, control contents of the motor 60 by the MPU 32b will be described with reference to
FIG. Here, FIG. 6 shows a plan view of the microphone unit 20b for explaining rotation control of
the microphone unit 20b according to the direction of the microphone unit 20b. The MPU 32b
monitors the rotation angle ω of the main body of the motor 60 detected by the gyro sensor 10b
(the angle of the front direction D2 of the main body of the motor 60 (or the wearing tool 50)
with respect to the reference direction D0). The direction of the microphone unit 20b (rotational
angle of the rotation shaft of the motor 60) is controlled. FIG. 6A shows the direction of the
microphone unit 20b in the initial state in which the front direction D2 of the motor 60 main
body (the front direction of the wearing tool 50) faces a predetermined reference direction D0. In
this initial state, the front direction of the microphone unit 20b is initially set to face the
reference direction D0. Further, in this initial state, the gyro sensor 10b is initialized, and its
detection angle ω becomes 0 °. FIG. 6B shows a state (detection angle of the gyro sensor 10b =
ω) in which the main body of the motor 60 (the wearing tool 50) is rotated counterclockwise by
the angle ω from the initial state. In this case, the MPU 32b rotates the microphone unit 20b by ω. As a result, as shown in FIG. 6C, the front direction of the microphone unit 20b is in the state
of facing the reference direction D0. FIG. 6D shows a state (detection angle of the gyro sensor
10b = ω) in which the main body of the motor 60 (the wearing tool 50) is rotated clockwise by
an angle ω from the initial state. Also in this case, the MPU 32b rotates the microphone unit 20b
by -ω. As a result, as shown in FIG. 6E, the front direction of the microphone unit 20b is in the
state of being oriented in the reference direction D0.
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[0017]
As described above, in the sound source separation device X2, when the worker wearing the
wearing tool 50 rotates, the motor 60 main body that is a portion for rotatably supporting the
microphone unit 20b rotates about the reference axis M0. Even in this case, the microphone unit
20b is held so as to face in a fixed direction. As a result, the worker who wears the wearing tool
50 to which the sound source separation device X2 is attached separates and generates only the
sound generated from a specific sound source through the speaker 40 even when the direction to
turn is changed. The (extracted) voice can be selectively listened to. Although the sound source
separation device X2 shown in FIG. 5 is configured to detect the direction of the support portion
(motor 60 main body) that rotatably supports the microphone unit 20b by the gyro sensor 10b,
other configurations are also possible. Conceivable. For example, the gyro sensor 10b may be
provided in the support portion 21b or the like of the microphone unit 20b, and the gyro sensor
10b may be configured to detect the direction of the microphone unit 20b. In this case, the angle
of the rotation axis of the motor 60 may be adjusted (controlled) so that the detection angle by
the gyro sensor 10b is always constant (= 0 °). The sound source separation device X2 shown in
FIG. 5 has a configuration in which the rotation axis of the motor 60 is the reference axis M0, but
by adopting a link mechanism such as a gear, the rotation axis of the reference axis M0 and the
motor 60 A configuration in which the two do not match may be considered.
[0018]
Further, in the sound source separation device X1 and the sound source separation device X2
described above, the sound source separation processing unit 31 with two inputs and two
outputs is exemplified, but a sound source separation processing unit having three or more input
/ output channels (number n of channels) Adoption is also considered. However, in this case, in
the sound source separation device X1, the number of microphones is n + 1 or more, and the
number of signals selected by the multiplexer 33a is n. In the sound source separation device X2,
the number of microphones is n. It is also conceivable to adopt other rotation angle detection
sensors other than the gyro sensors 10a and 10b as sensors for detecting the rotation angle.
Also, the microphone unit 20a in the sound source separation device X1 described above
supports three or more microphones 1L to 4L and 1R to 4R arranged in a 360 ° range around
the reference axis M0, A configuration in which the microphones 1L to 4L and 1R to 4R are
arranged in a narrower range is also conceivable. For example, when there is a restriction that
the range of the rotation angle of the wearing tool 50 is within 90 ° (± 45 °), the microphones
1L to 4L and 1R to 4R are 270 ° of the range around the reference axis M0 It can be considered
to be configured to be supported in a state of being aligned with each other.
04-05-2019
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[0019]
The present invention is applicable to voice input devices.
[0020]
FIG. 1 is a block diagram showing a schematic configuration of a sound source separation device
X1 according to a first embodiment of the present invention.
FIG. 2 is a schematic external view of a sound source separation device X1. The top view of the
microphone unit with which sound source separation device X1 is provided. FIG. 7 is a plan view
of a microphone unit for illustrating selection processing of a microphone according to the
direction of the microphone unit in the sound source separation device X1. FIG. 7 is a block
diagram showing a schematic configuration of a sound source separation device X2 according to
a second embodiment of the present invention. FIG. 10 is a plan view of a microphone unit for
explaining rotation control of the microphone unit in the sound source separation device X2.
Explanation of sign
[0021]
X1, X2: sound source separation apparatus according to an embodiment of the present invention
1, 2, sound source 1L to 4L, 1R to 4R: microphone 10a, 10b: gyro sensor 20a, 20b: microphone
unit 21a, 22b: support portion of microphone 30a, 30b: Control unit 40: Speaker In1, In2: input
channel Out1, Out2: output channel
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