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JP2008131112

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DESCRIPTION JP2008131112
[PROBLEMS] To provide a sound emission and collection device capable of automatically
measuring an interval between sound emission and collection devices installed adjacent to each
other. SOLUTION: A sound emission and collection device 1 connected to another sound emission
and collection device via a connection cable emits the installation interval investigation sound
(so), and the installation interval investigation sound (so) is received. An installation interval
survey signal (ds) received from the sound emission and collection device via the connection
cable is detected. The sound emission and collection device 1 calculates the installation distance
with another sound emission and collection device based on the time from the sound emission of
the installation distance investigation sound (so) to the detection of the installation distance
investigation signal (ds). The sound emission and collection device 1 calculates the sound
emission and collection azimuth angle that determines the sound collection and collection range
of the own device from the installation interval, and sets it to the own device. [Selected figure]
Figure 2
Sound emission device
[0001]
The present invention relates to a sound emission and collection device that automatically
recognizes the positions of other sound emission and collection devices and adjusts the sound
emission and collection azimuth angle when a plurality of sound emission and collection devices
are arranged.
[0002]
04-05-2019
1
2. Description of the Related Art Conventionally, as a method of holding a conference between
remote places, a method of disposing a sound emission and collection device at each point of the
meeting and connecting these devices by a network to communicate an audio signal is often
used.
Then, various sound emitting and collecting apparatuses used for such a conference have been
devised. In the microphone / speaker integrated type / two-way communication device of Patent
Document 1, a speaker that emits sound in all directions in the center portion is disposed, and a
plurality of unidirectional microphones are disposed radially from the center. The use of a small
number of people is assumed. In addition, the damper which prevents the vibration of a speaker
is attached so that a microphone may not sound-collect sound emitted from the speaker of an
own apparatus. In addition, when there is a large number of participants at one point, one
microphone / speaker integrated configuration type and two-way communication device of
Patent Document 1 can not be collected and collected, so it is considered to connect and use a
plurality of units Be JP 2004-343668 A
[0003]
However, when a plurality of units are connected and used, the microphone / speaker integrated
configuration type / two-way communication device of Patent Document 1 can avoid howling
due to the sound emission of its own device, but the sound emission from the speakers of other
devices There was a problem that howling by can not be avoided. In order to prevent such
howling, it is necessary to set so that the sound emission and collection azimuth ranges of
adjacent sound collection and collection devices do not overlap. And, setting of such a sound
collection and collection azimuth range requires an installation interval of the adjacent sound
collection and collection devices, and conventionally, after the installation of a plurality of sound
collection and collection devices, the installer measures with a measure etc. It was necessary to
give the installer a great deal of trouble at the time of initial setting.
[0004]
Therefore, an object of the present invention is to provide a sound emission and collection device
capable of automatically measuring the distance between the sound emission and collection
devices installed adjacent to each other. Furthermore, the object of the present invention is to
determine the sound emission and collection azimuth angle that determines the sound collection
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2
and collection range of the own device based on the distance from the adjacent sound emission
and collection device measured by the own device. An object of the present invention is to
provide a sound emission and collection device that can be set.
[0005]
The invention according to claim 1 is a connection means for receiving an audio signal based on
the sound emission voice of the own device collected by another sound emission and collection
device and a sound emission and collection means for emitting and collecting sound via the
connection cable. Connection interval calculating means for calculating a connection interval
with another connected sound emitting and collecting apparatus based on the sound emission
sound from the sound emitting and collecting means and the audio signal received by the
connection means; It is characterized by having.
[0006]
In this configuration, another sound emitting and collecting device that has collected the emitted
sound outputs the audio signal to the emitted sound emitting and collecting device connected via
the connection cable, and corresponds to the sound emission of the own device. The sound
emission and collection device receiving the sound signal calculates the installation interval
between the connected sound emission and collection device based on the sound emission sound
of the device itself and the sound signal.
Thereby, the sound emission and collection device can automatically calculate the installation
interval with another sound emission and collection device connected by the connection cable.
[0007]
In the invention of claim 2, the connection interval calculation means is based on an elapsed time
between a timing at which the own device emits sound and a timing at which the audio signal
corresponding to the emitted voice of the own device is received by the connection means. And
calculating the connection interval.
[0008]
In this configuration, the sound emission and collection device obtains the elapsed time from the
timing at which the sound emission is started and the timing at which the audio signal
corresponding to the sound emission of the device itself is received, thereby setting the
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3
installation interval with another sound emission and collection device. calculate.
[0009]
The invention according to claim 3 is characterized in that the connection interval calculation
means calculates the elapsed time on the basis of an audio signal received at first corresponding
to the sound emission sound of the device itself.
[0010]
In this configuration, the sound emission and collection device calculates the installation interval
with the connected sound emission and collection device based on the audio signal
corresponding to the sound emission of the first device received.
Thus, when a plurality of sound emission and collection devices are connected to the sound
emission and collection device, the sound emission and collection device is connected to the
nearest neighbor that most significantly affects the sound emission and collection range of the
own device. The installation interval with the sound emission and collection device can be
calculated.
[0011]
The invention of claim 4 is characterized in that the sound emitting and collecting means uses an
audio pulse as an emitted sound at the time of calculation of the connection interval.
[0012]
In this configuration, the sound emission and collection device uses the sound pulse for the
sound emission sound used to calculate the installation interval.
As a result, since the sound emission time of the emitted sound becomes very short, the sound
emission and collection device can greatly shorten the reception time of the audio signal
corresponding to the emitted sound.
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4
For this reason, the emitted sound emission and collection device does not receive an audio
signal from another sound emission and collection device while receiving an audio signal from
another sound emission and collection device.
In other words, the emitted sound emission and collection device receives audio signals from
different sound emission and collection devices without duplication. The sound emission and
collection device can reliably recognize the reception of the audio signal for each of the sound
emission and collection devices corresponding to the sound emission sound, even when other
sound emission and collection devices are installed near each other. Furthermore, since the voice
pulse is different in waveform from voice, ambient noise, and the like, the sound emitting and
collecting apparatus can be distinguished from voice, ambient noise, and the like.
[0013]
In the invention of claim 5, the connection means comprises a plurality of connection terminals
of a connection cable for receiving the audio signal, and the connection interval calculation
means measures the connection interval while performing switching control of the connection
terminals. It is characterized by doing.
[0014]
In this configuration, the sound emission and collection device has a plurality of connection
terminals for receiving audio signals from other sound emission and collection devices, and while
switching the connection terminal, installation for each other sound emission and collection
device connected to the connection terminal Measure the interval.
Thus, a plurality of sound emitting and collecting devices can be connected to one sound emitting
and collecting device, and the installation intervals of the sound emitting and collecting devices
nearest to each connection terminal can be measured.
[0015]
The invention according to claim 6 determines the sound emission and collection range
corresponding to the connection interval based on the sound collection range storage means for
storing the sound collection range information corresponding to the connection interval, and the
sound collection range information. The apparatus is characterized by comprising: a sound
emission and collection range determination means; and a sound emission and collection control
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means for controlling the sound emission and collection range by the sound emission and
collection means according to the determined sound emission and collection range.
[0016]
In this configuration, the sound emission and collection device determines the sound emission
and collection range from the installation interval calculated by the own device based on the
sound collection range information corresponding to each installation interval held by the own
device. Determine the corners and control the sound emission and collection range of your
device.
Thus, the sound emission and collection device can determine the sound emission and collection
range from the installation interval calculated by the own device, and can automatically set the
sound emission and collection range of the own device.
[0017]
As described above, according to the present invention, the sound emission and collection device
can calculate the installation interval with another sound emission and collection device
connected via the connection cable by itself. In addition, the sound emission and collection device
can determine the sound emission and collection azimuth angle that determines the sound
emission and collection range of the own device based on the installation interval calculated by
the own device, and can automatically set it. Furthermore, when a plurality of other sound
emitting and collecting apparatuses are connected via a connection cable, the sound emitting and
collecting apparatus is installed with an adjacent sound emitting and collecting apparatus that
most affects the sound emitting and collecting range of the own apparatus. The interval can be
calculated.
[0018]
First Embodiment A sound emission and collection device according to a first embodiment of the
present invention will be described with reference to FIGS. FIG. 1 is a plan view of the sound
emission and collection device 1. FIG. 2 is a block diagram showing the function of the sound
emission and collection device 1. FIG. 3 is a block diagram showing the flow of signals when the
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sound emitting and collecting apparatuses 1A and 1B are connected. Note that the block diagram
of the sound emission and collection device 1A, 1B in FIG. 3 omits a part of the function.
[0019]
As shown in FIG. 1, the sound emission and collection device 1 of the present embodiment
includes an operation unit 11, an input / output connector 12, a speaker array 13 (speakers 13a
to 13p), a microphone array 14 (microphones 14a to 14p), 15 (microphones). 15a to 15p) and
the like.
[0020]
The operation unit 11 includes a plurality of buttons and a display screen, and receives operation
input of various settings such as start and stop of the sound emission and collection device 1,
setting of the sound emission and collection device connected via the network, and sound
emission volume and the like. .
In addition, the operation unit 11 receives an operation input of an execution mode such as a
normal mode and a sound collection range automatic setting mode. The operation unit 11 is
connected to the control unit 24, receives various user's operation input, outputs various setting
and execution mode etc. to the control unit 24, and displays operation contents and execution
mode on the display screen. . The normal mode is an execution mode in which voice
communication is performed with respect to another connected sound emitting and collecting
apparatus. The sound emission and collection range automatic setting mode is an execution
mode in which the installation interval with another sound emission and collection device
connected via an audio cable is detected, and the sound emission and sound collection range of
the own device is automatically set.
[0021]
As shown in FIG. 2, the input / output connector 12 includes a LAN interface 12e, analog audio
input terminals (hereinafter, audio input terminals) 12a and 12b, analog audio output terminals
(hereinafter, audio output terminals) 12c and 12d, etc. Ru. Hereinafter, the audio input terminals
12a and 12b and the audio output terminals 12c and 12d are collectively referred to as audio
terminals. The input / output connector 12 is connected to the communication control unit 20.
Specifically, using the LAN interface 12e, the sound emission and collection device 1 is connected
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via the network 3 to a sound emission and collection device installed at a remote location. Also,
using the audio terminal, the sound emission and collection device 1 is connected to another
sound emission and collection device etc. via an audio cable.
[0022]
The speaker array 13 includes a plurality of nondirectional speakers 13a to 13p on the bottom of
the sound emission and collection device 1, and converts the sound emission analog sound signal
input from the sound emission control unit 21 into a sound and releases the sound. Sound. The
speaker array 13 may be configured of directional speakers.
[0023]
The microphone arrays 14 and 15 are composed of a plurality of microphones 14 a to 14 p and
15 a to 15 p on both side surfaces of the sound emission and collection device 1, and are used
for collecting electricity by electrically converting the sound collected by the microphone arrays
14 and 15. An analog audio signal is generated and output to the sound collection control unit
22.
[0024]
Further, as shown in FIG. 2, the sound emission and collection device 1 functionally includes a
communication control unit 20, a sound emission control unit 21, a sound collection control unit
22, an echo canceller 23, a control unit 24, and a ROM 25. .
[0025]
The control unit 24 controls the communication control unit 20, the sound emission control unit
21, and the sound collection control unit 22 based on the operation input information from the
operation unit 11.
Further, the control unit 24 generates an installation interval check sound (so) and outputs it to
the sound emission control unit 21.
The control unit 24 is connected by an audio terminal from the sound generation time of the
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8
installation interval investigation sound (so) emitted by the own apparatus and the reception time
of the installation interval investigation signal (ds) received from the other sound emitting and
collecting apparatus The installation interval with the sound emission and collection device is
detected, and the sound emission azimuth angle is determined.
[0026]
Specifically, in the case of the sound emission and collection range automatic setting mode, as
shown in FIG. 3, the control unit 24 of the sound emission and collection device 1A enables /
disables the audio input terminals 12a and 12b with respect to the communication control unit
20. Output the input terminal control signal (is) specifying. Further, the control unit 24 calculates
the elapsed time from the difference between the sounding time of the installation interval
survey sound (so) and the reception time of the installation interval survey signal (ds) inputted
from the communication control unit 20 at the earliest. The control unit 24 detects an
installation interval with another sound emitting and collecting apparatus connected on the left
and right based on the elapsed time and the installation interval calculation information for the
elapsed time stored in the ROM 25. Further, the control unit 24 determines the sound emission
and collection range of the own device based on the detected installation interval and the sound
emission and collection range information for the installation interval, and generates a sound
collection and azimuth angle signal (as). The control unit 24 outputs a sound emission azimuth
signal (as) that defines a sound emission range (sound emission directivity and sound collection
directivity) to the sound emission control unit 21 and the sound collection control unit 22. In
addition, the installation interval with the sound emission and collection device connected to the
left and right operates the timer simultaneously with the sounding of the installation interval
survey sound (so), and the elapsed time until the reception of the installation interval survey
signal (ds) received earliest It may be calculated based on the timer value and the installation
interval calculation information.
[0027]
The ROM 25 stores a control program such as a computer program for automatically setting the
sound emission range, and when the sound emitting and collecting apparatus is activated, the
control program is read and executed. The ROM 25 also stores installation interval calculation
information and sound emission range information. The installation interval calculation
information is composed of the time (elapsed time) from the sounding of the installation interval
inspection sound (so) to the reception of the installation interval inspection signal (ds) and the
installation interval of the sound collection device corresponding to each elapsed time. Be done.
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The sound emission and collection range information includes an installation interval of the
sound emission and collection device and a sound emission and collection range (a sound
emission and collection azimuth angle) corresponding to each installation interval.
[0028]
The communication control unit 20 performs protocol control of data input from the network 3
and data output to the network 3 when the input / output connector 12 is the LAN interface 12
e. When the input / output connector 12 is the audio terminals 12a to 12e, the communication
control unit 20 performs A / D conversion of data input from the audio input terminals 12a and
12b and D / D of data to be output to the audio output terminals 12c and 12d. Perform A
conversion. Further, the communication control unit 20 is a signal that the input data is used to
detect the installation interval between the own apparatus and another apparatus (installation
interval investigation sound (so) and installation interval investigation signal (ds)) And audio data,
and output them to appropriate functional units. Further, the communication control unit 20
receives an input terminal control signal (is) from the control unit 24 and performs input /
output control of the input / output connector 12.
[0029]
The control processing of data input to the communication control unit 20 will be described
below for each data input destination, with the input / output connectors being classified into the
LAN interface 12e and the audio terminals 12a to 12e. (1) When data is input from the LAN
interface 12 e The communication control unit 20 converts the data from the data format
(protocol) corresponding to the network 3 into digital audio data for noise emission, and releases
the data via the echo canceller 23. Output to the sound control unit 21.
[0030]
(2) When an analog voice signal is input from the audio input terminals 12a and 12b, the
communication control unit 20 converts the analog voice signal into a sound emitting digital
voice data (including the installation interval check signal (ds)) and releases the voice signal. It is
determined whether the digital audio data for sound is an installation interval survey signal (ds).
When the sound emission digital audio data is the installation interval investigation signal (ds),
the sound emission digital audio data is output to the control unit 24. Further, the
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10
communication control unit 20 converts the sound emitting digital audio data into an analog
audio signal, and outputs the analog audio signal to the audio output terminals 12c and 12d.
Further, the communication control unit 20 outputs the sound emission digital voice data to the
sound emission control unit 21 through the echo canceller 23 when the sound emission digital
audio data is other than the installation interval investigation signal (ds).
[0031]
(3) When collected digital audio data (including the installation interval investigation sound (so))
is input from the echo canceller 23 whether the communication control unit 20 determines that
the collected digital audio data is the installation interval investigation sound (so) to decide.
When the collected digital audio data is the installation interval investigation sound (so), it is D /
A converted and output to the audio output terminals 12c and 12d. If the collected digital audio
data is other than the installation interval investigation sound (so), the collected digital audio
data is converted to a data format (protocol) corresponding to the network 3 and output to the
LAN interface 12e. Further, the communication control unit 20 converts the collected digital
audio data into an analog audio signal, and outputs the analog audio signal to the audio output
terminals 12c and 12d.
[0032]
(4) When the input terminal control signal (is) is input from the control unit 24 The
communication control unit 20 outputs the input terminal control signal (is) to the input / output
connector 12. The input terminal control signal (is) sets the functions of the audio input
terminals 12a and 12b to valid / invalid.
[0033]
In order to simplify the explanation, the sound emitted by the sound emission and collection
device 1A is taken as the installation interval investigation sound (so), and from the other sound
emission and collection equipment 1B and 1C, the installation interval investigation sound (so) is
collected. Although the analog voice signal to be output is described as the installation interval
survey signal (ds), the communication control unit 20 actually collects the installation interval
survey sound (so) collected as the installation interval survey signal (ds). Are output as they are
to the audio output terminals 12c and 12d.
04-05-2019
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[0034]
Further, not limited to the present embodiment, when the communication control unit 20
determines that the collected digital audio data is the installation interval investigation sound
(so), the communication control unit 20 has the same direction as the installation interval
investigation sound (so). The installation interval survey signal (ds) may be output from the audio
output terminals 12c, 12d.
For example, when the installation interval survey sound (so) is collected from the left side of the
sound emission and collection device 1, the installation interval survey signal (ds) may be output
only from the left (L) audio output terminal 12c.
[0035]
The sound emission control unit 21 emits sound according to the speakers 13a to 13p of the
speaker array 13 with respect to the installation interval investigation sound (so) input from the
control unit 24 in the sound emission and collection range automatic setting mode. It performs
directivity control, D / A conversion, amplification and the like, and outputs the result to the
speaker array 13. Further, the sound emission control unit 21 receives the sound emission
direction input from the control unit 24 for the sound emission digital audio data input from the
communication control unit 20 through the echo canceller 23 in the normal mode. Sound
emission directivity control, D / A conversion, amplification and the like according to the
speakers 13a to 13p of the speaker array 13 are performed according to the angle signal (as),
and the generated sound emission analog audio signal is output to the speaker array 13.
[0036]
The sound collection control unit 22 amplifies, A / D converts, and controls the sound collection
analog sound signal when the sound collection analog sound signal is input from the microphone
arrays 14 and 15 regardless of the execution mode. Sound collection directivity control or the
like is performed according to the sound collection azimuth signal (as) input from the unit 24,
and the collected sound digital audio data is output to the echo canceller 23.
[0037]
The echo canceller 23 removes an echo from the collected digital audio data input from the
sound collection control unit 22 and outputs the echo to the communication control unit 20.
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12
[0038]
Next, a procedure in the case where the sound emission and collection device 1 automatically
adjusts the sound emission and collection range of the own device will be described with
reference to FIGS.
FIG. 4 is an explanatory diagram regarding automatic setting of the sound emission and
collection range of the sound emission and collection device 1.
FIG. 5 is a flowchart relating to the flow of the operation of the sound emission and collection
device 1. FIG. 5A shows a procedure of processing of the sound emission and collection device
1A in the sound emission and collection range automatic setting mode. FIG. 5 (B) shows the
procedure of processing of the sound emission and collection device 1B that has received the
installation interval investigation sound.
[0039]
Hereinafter, a case where the sound emission and collection device 1A arranged as shown in FIG.
4 executes the sound emission and collection range automatic setting mode will be described
with reference to FIG. In FIG. 4, the sound emission and collection device 1A set in the sound
emission and collection range automatic setting mode is connected to the sound emission and
collection device 1B via the audio cable, and the sound emission and collection device 1B is via
the audio cable It is connected to the sound emission and collection device 1A, 1C. Note that the
present invention is not limited to this embodiment, and the sound emission and collection device
may be connected to both sides of the sound emission and collection device 1A set in the sound
emission and collection range automatic setting mode. Also, the number of connected devices
may be any number.
[0040]
When the sound emission and collection device 1A is set to the sound emission and collection
range automatic setting mode, measurement of the installation interval with the sound emission
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and collection devices 1B and 1C connected via the audio terminal on the left side of the sound
emission and collection device 1A in S101. To start. First, the function is enabled only for the left
(L) audio input terminal 12a, and the installation interval with another sound emitting and
collecting device installed on the left side of the sound emitting and collecting device 1A is
checked. The sound emission and collection device 1A sets the input terminal control signal (is)
and disables the function of the right (R) audio input terminal 12b. Next, the sound emission and
collection device 1A emits the installation interval investigation sound (so) in all directions from
the speaker array 13 and measures the emission time of the installation interval investigation
sound (so) (S102).
[0041]
At S201, the sound emission and collection devices 1B and 1C collect the installation interval
investigation sound (so) by the microphone arrays 14 and 15. The sound emission and collection
devices 1B and 1C output the installation interval survey sound (so) as the installation interval
survey signal (ds1 and ds2) from the left (L) and right (R) audio output terminals 12c and 12d,
respectively (S202) . At this time, the sound emission and collection device 1B outputs the
installation interval investigation signal (ds1) to the sound emission and collection device 1A and
the sound emission and collection device 1C, and the sound emission and collection device 1C
outputs the installation distance investigation signal (ds2) to the sound emission and collection
device 1B. Output). The installation interval investigation signal (ds2) of the sound emission and
collection device 1C passes through the sound emission and collection device 1B and is input to
the sound emission and collection device 1A.
[0042]
When the installation interval investigation signal (ds1, ds2) is input from the left (L) audio input
terminal 12a in S103, the sound emission and collection device 1A proceeds to S104. At this
time, if the installation interval survey signal (ds) is not input even after a predetermined time
has elapsed since the installation interval survey sound (so) is emitted, the left (L) audio terminals
12a and 12c are discharged. Assuming that no sound device is connected, the sound emission
and collection device 1A sets a default sound emission and collection azimuth at S106.
[0043]
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At S104, the sound emission and collection device 1A outputs the sound emission time of the
installation interval survey sound (so) and the installation interval survey signal (ds1) input first
after emitting the installation interval survey sound (so). The elapsed time is calculated from the
difference of the reception time. The sound emission and collection device 1A detects the
installation distance from the sound emission and collection device connected to the left (L) audio
terminals 12a and 12c based on the elapsed time and the installation interval calculation
information.
[0044]
In S105, the sound emission and collection device 1A determines the sound emission and
collection range on the left side of the sound emission and collection device 1A from the
installation interval and the sound emission and collection range information, and generates a
collection and collection azimuth signal (as). The sound emission and collection device 1A sets
the left sound emission and collection azimuth based on the sound collection and collection
azimuth signal (as).
[0045]
Specifically, the generation of the emitted and collected azimuth signal (as) is performed in the
following procedure. First, the sound emission and collection device 1A emits the installation
interval investigation sound (so) in all directions at time t0. The sound emission and collection
devices 1B and 1C pick up the installation interval survey sound (so) and output the installation
interval survey signals (ds1 and ds2) from the left (L) and right (R) audio output terminals 12c
and 12d. . The sound emission and collection device 1A receives the installation interval
investigation signal (ds1, ds2) at time t1, t2. Since the sound emission and collection device 1A
first receives the installation distance investigation signal (ds1) from the sound emission and
collection device 1B installed closest to its own device, the reception time (t1) of the installation
distance investigation signal (ds1) The elapsed time (t1-t0) is determined from the sound
production time (t0) of the installation interval investigation sound (so) From the installation
interval calculation information of ROM 25 and the elapsed time (t1-t0), the sound emission and
collection device 1A obtains the installation interval with the sound emission and collection
device 1B installed closest to the collection interval information of the ROM 25 and From the
installation interval, the sound emission and collection range of the own device is determined,
and the sound emission and collection azimuth signal (as) is generated. The sound emission and
collection device 1A sets the sound emission and collection azimuth angle of the own device
based on the sound collection and collection azimuth signal (as).
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[0046]
Next, the sound emission and collection device 1A disables the function of the left (L) audio input
terminal 12a and determines the function of the right (R) audio input terminal 12b in order to
determine the sound collection azimuth angle on the right side. It becomes effective. Then, the
sound emission and collection device 1A obtains the sound collection and collection azimuth
angle on the right side in the same procedure as the sound collection and collection azimuth
angle on the left side (S107 to S112). When the left and right collected sound collection azimuth
angles are determined, the sound collection and collection device 1A cancels the collected sound
collection range automatic setting mode and shifts to the normal mode in which voice
communication is performed.
[0047]
In the present embodiment, the sound emission and collection device 1A calculates the
installation interval with another sound emission and collection device 1B by emitting the
installation interval investigation sound (so) separately on the left side and the right side of the
own device. . However, the invention is not limited to this. The sound emission and collection
device 1A enables the left (L) and right (R) audio input terminals to emit an installation interval
investigation sound (so). The sound emission and collection device 1A discriminates the left (L)
and the right (R) of the audio input terminal to which the installation interval investigation signal
(ds) is input, thereby other sound emission and collection installed on the left side and the right
side of the own device. The installation interval with the device may be calculated.
[0048]
From the above, in the sound emission and collection device 1A of this embodiment, when the
sound emission and collection range automatic setting mode is selected, the installation interval
with the next sound emission and collection device 1B connected by the audio cable is calculated,
The sound collection range can be determined, and the sound collection azimuth angle of the
own device can be set. In addition, since the sound emission and collection device 1A can keep
the frequency of the installation interval investigation sound (so) constant, it can pick up the
voice of the person or the surrounding noise and the installation interval investigation sound (so)
in a distinguished manner. Therefore, it is possible to obtain an accurate installation interval
04-05-2019
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without being affected by the speaking voice and the ambient noise. Further, since the sound
propagation time differs for each frequency, the propagation time can be accurately calculated
by setting a specific frequency to the installation interval investigation sound (so). Therefore,
since the sound emission and collection device 1A can accurately calculate the elapsed time from
the emission of the installation interval investigation sound (so) to the reception of the
installation interval investigation signal (ds), the installation interval can be more accurately
determined. it can. As a result, when the user disposes the sound emission and collection device,
the user does not need to know the arrangement location and installation distance of each of the
sound emission and collection devices 1A to 1C. Further, the sound emission and collection range
of each of the sound emission and collection devices 1A to 1C is determined so as not to affect
other sound emission and collection devices. For this reason, since each sound emitting and
collecting apparatus 1A to 1C does not collect sound emitted from the speakers of other sound
emitting and collecting apparatuses, howling does not occur.
[0049]
Second Embodiment Next, a second embodiment of the present invention will be described with
reference to FIGS. Unlike the first embodiment, the second embodiment of the present invention
uses voice pulses, not voice, to measure the installation interval with each sound emitting and
collecting apparatus. FIG. 6 is a block diagram showing the flow of signals when the sound
emitting and collecting apparatuses 1A and 1B are connected.
[0050]
In the sound emission and collection device 1A, a sound pulse generation circuit 241 of the
control unit 24 generates an installation interval investigation sound (so) which is a sound pulse,
and generates the sound from the speaker array 13 in all directions. The other sound emitting
and collecting apparatus 1B, when collecting the installation interval survey sound (so) from the
microphone arrays 14 and 15, sets each installation interval survey signal (ds) which is an audio
pulse to the left (L) and the right (R). Output from the audio output terminals 12c and 12d. When
the sound emission and collection device 1A receives the installation distance investigation signal
(ds), the sound emission and collection device 1B is generated from the elapsed time from the
generation of the installation space investigation sound (so) to the reception of the installation
distance investigation signal (ds). Calculate the installation interval.
[0051]
04-05-2019
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Note that since the voice pulse is different in waveform from the voice and the surrounding
noise, the sound emission and collection device 1 can easily distinguish the voice and the
surrounding noise from the installation interval investigation sound (so). Therefore, the sound
emission and collection device 1 can reliably recognize and receive the installation interval
investigation sound (so).
[0052]
Furthermore, since the sound pulse has a very short sound emission time as compared to the
sound, the sound emission and collection device 1A can extremely shorten the sound emission
time of the installation interval investigation sound (so). Along with this, the sound emission and
collection device 1A can make the reception time of the installation interval investigation signal
(ds) very short. As a result, even when the sound emission and collection devices 1A to 1C are
disposed close to each other, the sound emission and collection device 1A emits the sound
emission while receiving the installation interval survey signal (ds1) from the sound emission and
collection device 1B. It does not receive the installation interval survey signal (ds2) of the device
1C. That is, the sound emission and collection device 1A receives the installation interval check
signals (ds1, ds2) from the sound collection and collection devices 1B and 1C without
overlapping. The sound emission and collection device 1A can reliably recognize the reception of
the respective installation interval survey signals (ds1, ds2). In addition, by using a single pulse
as the sound pulse, the sound emission and collection device 1A can further shorten the sound
emission time of the installation interval investigation sound (so).
[0053]
Further, each of the sound emission and collection devices 1B and 1C performs delay processing
in the communication control unit 20 when outputting the installation interval check signal (ds).
The installation interval investigation signal (ds1) output from the sound emission and collection
device 1B is subjected to delay processing by the sound emission and collection device 1B. Since
the installation interval investigation signal (ds2) output from the sound emission and collection
device 1C passes through the sound emission and collection device 1B and reaches the sound
emission and collection device 1A, delay processing is performed by the sound emission and
collection device 1C, 1B. .
04-05-2019
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[0054]
As a result, the sound emission and collection device 1A significantly differs in the reception time
of the installation interval investigation signals (ds1, ds2) output by the sound emission and
collection devices 1B and 1C. Therefore, the sound emission and collection device 1A can easily
recognize the installation interval investigation signal (ds1) of the sound emission and collection
device 1B disposed closest to the sound collection and collection device 1A. Further, the sound
emission and collection device 1A corrects the delay time in the order of receiving the
installation interval investigation signals (ds1, ds2). As a result, the sound emission and collection
device 1A can measure not only the installation distance between the sound emission and
collection device 1B closest to the nearest one, but also the installation interval between the
sound emission and collection device 1C and the own device.
[0055]
In the first and second embodiments, the sound emission and collection azimuth is determined
based on the installation interval, but the sound emission and collection azimuth may be
determined based on the installation distance and the sound emission volume. Next, the case of
determining the sound emission and collection azimuth based on the installation interval and the
sound emission volume will be described with reference to FIG. FIG. 7 is an explanatory view of a
sound emission and collection azimuth angle of the sound emission and collection device 1. FIG.
7A shows the case where the sound emission volume is a small volume. FIG. 7B shows the case
where the sound emission volume is high. As shown in FIG. 7, the user 4 changes the sound
emission volume according to the distance between the user 4 and the sound emission and
collection device 1A, 1B. Even if the installation intervals of the sound emission and collection
devices 1A and 1B connected by the audio cable are the same, if the sound emission volumes of
the sound emission and collection devices 1A and 1B are different, the sound emission and
collection ranges of the sound emission and collection devices 1A and 1B are different.
Therefore, it is preferable to determine the sound emission and collection azimuth angles W1 and
W2 of the sound emission and collection devices 1A and 1B based on the installation interval and
the sound emission volume.
[0056]
In the first and second embodiments, an analog audio terminal is used as the audio terminal, but
a digital audio terminal may be used.
04-05-2019
19
[0057]
In the first and second embodiments, two audio terminals are provided on the left and right for
simplification of the description, but as shown in FIG. 8, one audio terminal capable of stereo
input to the sound emission and collection device 100 is provided. Even in the case of provision,
the measurement of the installation interval with another sound emission and collection device
and the setting method of the sound emission and collection range of the own device are the
same.
In this case, the distributor 5 is connected to the sound emission and collection device 100. The
distributor 5 divides an audio signal or the like output from the audio terminal into left (L) and
right (R) and outputs the same. Also, the distributor 5 inputs in parallel an audio signal or the like
input from the left (L) and the right (R) of the distributor 5 to the audio terminal. Thus, the sound
emission and collection device 100 inputs and outputs the audio signal input / output direction
(left and right) to / from the audio terminal of its own device, as in the sound emission and
collection device provided with the audio terminal on the left (L) and right (R). Can be judged.
[0058]
It is a top view of sound emission and collection device 1 concerning a 1st embodiment of the
present invention. It is a block diagram which shows the function of the sound emission and
collection apparatus 1 which concerns on 1st Embodiment of this invention. It is a block diagram
which shows the flow of the signal at the time of sound emission-collection apparatus 1A, 1B
connection. FIG. 6 is an explanatory diagram regarding automatic setting of a sound emission
and collection range of the sound emission and collection device 1. It is a flowchart regarding the
flow of operation | movement of the sound emitting and collecting apparatus 1 which concerns
on 1st Embodiment of this invention. It is a block diagram which shows the flow of the signal at
the time of sound emitting and collecting apparatus 1A, 1B connection which concerns on 2nd
Embodiment. FIG. 6 is an explanatory diagram regarding a sound emission and collection
azimuth angle of the sound emission and collection device 1. It is explanatory drawing of the
sound emission and collection apparatus 100 which provided one audio terminal.
Explanation of sign
[0059]
04-05-2019
20
1, 1A to 1C, 100-sound emission and collection device, 3-network, 4-user 5, 5 distributor, 11operation unit, 12-input / output connector, 12a-left audio input terminal, 12b-right audio input
Terminal, 12c-left audio output terminal, 12d-right audio output terminal, 12e-LAN interface, 13speaker array, 13a-13p-speaker, 14, 15-microphone array, 14a-14p, 15a-15p-microphone, 20 Communication control unit, 21-Sound emission control unit, 22-Sound collection control unit,
23-Echo canceller, 24- control unit, 25-ROM, 241-Voice pulse generation circuit,
04-05-2019
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