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JP2009027290

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2009027290
The present invention provides a loudspeaker system which can be easily installed in a
conference room and can realize an optimum configuration and noise emission easily according
to the specifications of the conference room. In a sound amplification system, a plurality of sound
emission and collection devices 1 (1a to 1e) are connected in a straight line via transmission
lines, and transmit and receive various signals between the sound emission and collection devices
1. Identification numbers H1 to H5 are assigned to each of the sound emission and collection
devices 1 based on the arrangement pattern of the sound emission and collection devices 1. Each
sound emission and collection device 1 performs sound emission processing based on the
synchronization signal generated by the sound emission and collection device 1 that has started
sound collection first. The sound collection side sound emission and collection device 1 transmits
the collected sound signal to the sound emission side sound collection and collection device 1.
When the sound emission side sound emission and collection device 1 receives an audio signal,
the sound emission side sound emission and collection device 1 refers to its own device position
with reference to array pattern information consisting of an array pattern of each sound emission
and collection device 1 and control information including identification numbers H1 to H5. Then,
a sound emission directivity beam is formed and emitted so as to be emitted from the sound
collection side sound emission and collection device 1 side. [Selected figure] Figure 1
Loudspeaker system
[0001]
A loud-sounding system that loudens and emits the sound collected or the sound received from a
remote location.
04-05-2019
1
[0002]
In a large conference room, a listener who is present at a distance from the speaker may have
difficulty in hearing the speaker's voice.
Therefore, various systems for expanding the voice of the speaker have been devised (see, for
example, Patent Document 1). JP, 2006-0211177, A
[0003]
In the loudspeaker system of Patent Document 1, a microphone or a speaker is disposed on a
wall or ceiling of a conference room, and an audio signal picked up by the microphone is
amplified and emitted from the speaker. It is necessary to carry out large-scale installation such
as embedding a loudspeaker system in a large scale system. Also, in accordance with the
specifications of the conference room, it is necessary to design a microphone, a speaker, and the
like that constitute the sound amplification system.
[0004]
Therefore, the present invention provides a loudspeaker system that can be easily installed in a
conference room without using a large-scale configuration, and can easily realize an optimal
configuration and sound emission according to the specifications of the conference room. With
the goal.
[0005]
The invention of the sound amplification system includes a plurality of sound emission and
collection devices provided with sound collection means, sound emission means, and sound
emission control means for controlling the sound emission directivity of the sound emission
means, and the plurality of sound emission and collection devices A plurality of sound emitting
and collecting devices are connected by a transmission line, arranged in a predetermined
arrangement pattern, and sound signals from the sound collecting side sound emitting and
collecting device which collected the sound are collected on the sound collecting side A sound
amplification system for transmitting to a sound emission side sound emission and collection
device other than the device and emitting sound from the sound emission side sound emission
and collection device, wherein the plurality of sound emission and collection devices are each of
the arrangement pattern. The positional relationship information is stored in advance, and the
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2
sound collecting side sound emitting and collecting device associates identification information
for identifying the sound collecting side sound emitting and collecting device with the sound
signal to be transmitted, and transmits the sound signal. The sound emission and collection
device emits the sound collection side based on the identification information associated with the
voice signal and the positional relationship information. A control for realizing the sound
emission directivity is emitted from the direction of the device and to execute at the sound
emission control means.
[0006]
In the sound amplification system of this configuration, a plurality of sound emission and
collection devices capable of controlling the sound emission directivity are provided and
connected by transmission lines.
The sound collection side sound emission and collection device which collected the sound signal
transmits the sound signal and the identification information of the own device to another sound
emission and collection device (sound emission side sound collection and collection device).
The sound emission side sound emission and collection device determines sound emission
directivity based on the arrangement pattern of the plurality of sound emission and sound
collection devices stored in the own device and the identification information of the sound
collection side sound emission and collection device, The sound signal is emitted from the
direction of the sound collection side sound emission device. As a result, using a plurality of
sound emission and collection devices, the sound collected by the sound emission and collection
device can be loudened and emitted from another sound emission and collection device.
Therefore, this loudspeaker system can be realized only with a plurality of sound emission and
collection devices and transmission lines, so it can be easily installed in a conference room, and
an optimal configuration can be easily achieved according to the specifications of the conference
room. realizable.
[0007]
Further, in the sound amplification system according to the present invention, the sound
emission control unit of the sound emission side sound emission and collection device emits
sound toward the side opposite to the sound collection side sound emission and collection device
with reference to the own device. It features.
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3
[0008]
In this configuration, the sound emission side sound emission and collection device emits the
audio signal to the side opposite to the sound collection side sound emission and collection
device side based on the position of the own device.
Thereby, since the sound collection side sound emission and collection device does not collect
the sound signal emitted by the sound emission side sound collection and collection device, it is
possible to prevent the howling only by sound emission control. In connection with this, each
sound emission and collection device which constitutes a loud-sound system can make audio
signal processing for eliminating howling etc. into simple composition.
[0009]
Further, in the loudspeaker system according to the present invention, when there are a plurality
of audio signals, each of the sound collection side sound emission and collection devices receives
the audio received via the transmission line other than the audio signal based on the sound
collection by the own device. Sound emission directivity is realized in which the sound is emitted
from the direction of the sound collecting side sound emitting and collecting device that has
generated the sound signal, and each sound emitting side sound emitting and collecting device
performs the above-described process for each received sound signal. It is characterized in that
sound emission directivity is set.
[0010]
In this configuration, when there are a plurality of audio signals simultaneously, each sound
collection side sound emission and collection device does not emit an audio signal due to its own
sound collection, but an audio signal received through a transmission line is Set the emission
directivity and emit the sound like.
At this time, if there are a plurality of audio signals received through the transmission line, the
above-described emission directivity is set for each of the audio signals, and the combination of
these is performed to perform the emission. On the other hand, the sound emission side sound
emission and collection device that does not collect sound by itself sets the above-described
sound emission directivity for each of the plurality of audio signals received via the transmission
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4
line, Perform combined noise emission. As a result, when there are a plurality of audio signals, it
is possible to cause each of the sound collection sources to emit corresponding sounds.
[0011]
Furthermore, at least one of the plurality of sound emitting and collecting apparatuses includes
communication control means for performing connection control with a network outside the
sound amplification system, and at least one of the plurality of audio signals is a sound
amplification system via the communication control means. It is characterized in that it is an
audio signal from outside the loudspeaker system accepted inside.
[0012]
In this configuration, transmission and reception of an audio signal are performed with the sound
emission and collection device installed at a remote place, using the above-described loudspeaker
system.
Each of the sound emission and collection devices that constitute the sound amplification system
emits an audio signal received from the sound emission and collection device installed at a
remote location. At this time, each sound emission and collection device sets the sound emission
directivity according to the sound signal acquired through the network.
[0013]
According to the present invention, the loudspeaker system comprises only a plurality of sound
emission and collection devices capable of controlling sound emission directivity and a
transmission line, so that the loudspeaker system can be easily installed in the conference room,
and the specifications of the conference room In accordance with the above, it is possible to
easily realize the optimum configuration and noise emission. Furthermore, since the sound
emitted from the sound emitting side sound emitting and collecting apparatus hardly gets around
the sound collecting side sound emitting and collecting apparatus, it is possible to suppress the
occurrence of howling in the sound amplification system.
[0014]
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5
The loudspeaker system according to the present embodiment will be described with reference to
FIGS. 1 to 3. FIG. 1 is an explanatory view of a loudspeaker system including a plurality of sound
emitting and collecting devices. In FIG. 1A, a plurality of sound emission and collection devices
are arranged in a line in a predetermined direction (X direction), and the sound emission and
collection device at the -X side end along the X direction becomes a sound collection side sound
emission and collection device A case is shown, and FIG. 1 (B) shows a case where the sound
emission and collection device at the + X side end along the X direction becomes the sound
collection side sound collection and collection device. FIG. 1C shows a case where a plurality of
sound emitting and collecting devices are arranged in a line, and the center sound emitting and
collecting device becomes a sound collecting side sound emitting and collecting device. FIG. 2 is a
block diagram showing a functional configuration of the sound emission and collection device
that constitutes the sound amplification system. FIG. 3 is a flowchart showing a flow of
processing from when the sound collecting side sound emitting and collecting device picks up to
when the sound emitting side sound emitting and collecting device emits sound.
[0015]
As shown in FIG. 1, in the sound amplification system according to the present embodiment, a
plurality of sound emission and collection devices 1 (1 a to 1 e) are connected in a straight line
via a transmission line. Send and receive various signals. The transmission line is controlled by a
communication protocol such as, for example, mLAN (registered trademark), CobraNet, or
Ethernet. Identification numbers H1 to H5 are assigned to each of the sound emission and
collection devices 1 based on the arrangement pattern of the sound emission and collection
devices 1. Each sound emission and collection device 1 performs sound emission processing
based on the synchronization signal generated by the sound emission and collection device 1
that has started sound collection first. In addition, users 2 (2a to 2n) are present around each
sound emitting and collecting device 1.
[0016]
The sound emission and collection device 1 (hereinafter, the sound collection side sound
emission and collection device 1) which has collected the speech of the user 2 transmits the
generated voice signal to another sound emission and collection device 1. The sound emitting
and collecting device 1 (hereinafter, the sound emitting side sound emitting and collecting device
1) excluding the sound collecting side sound emitting and collecting device 1 receives the audio
signal and arranges the array pattern information including the array pattern of each sound
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emitting and collecting device 1 The directional beam is formed and emitted with reference to
the control information including the identification numbers H1 to H5.
[0017]
More specifically, for example, as shown in FIG. 1A, the sound collecting side sound emitting and
collecting device 1a at one end (the end in the -X direction) of the sound emitting and collecting
device row collects the speech of the user 2a When the signal is generated, the control signal
including the synchronization signal, the identification number H1 of the own device, and the
generated audio signal are transmitted to the sound emission side sound emission and collection
devices 1b to 1e through the transmission line. Each of the sound emitting side sound emitting
and collecting apparatuses 1b to 1e that receives the audio signal etc. via the transmission line
has the arrangement pattern of each sound emitting and collecting apparatus 1, the identification
number H1 included in the control information, and the identification number of the own
apparatus. Based on H2 to H5, the positional relationship between the own device and the sound
collection side sound emission and collection device 1a is acquired. The sound emission side
sound emission and collection devices 1b to 1e are uttered from the sound collection side sound
emission and collection device 1a side on the basis of the position of the own device according to
this positional relationship, and are in conflict with the sound collection side sound emission and
collection device 1a. The sound emission directivity is set so that the sound signal is emitted so
as to be propagated to the user side. That is, the sound emitting side sound emitting and
collecting apparatus 1b to 1e emits the sound signal so that the sound propagates from the -X
direction to the + X direction.
[0018]
Further, as shown in FIG. 1B, when the sound collecting side sound emitting and collecting device
1e at the + X direction end of the sound emitting and collecting device row collects the speech of
the user 2g to generate an audio signal, the sound emitting side is released. The control signal
including the synchronization signal, the identification number H5 of the own device, and the
generated audio signal are transmitted to the sound collection devices 1a to 1d via the
transmission line. Each of the sound emitting side sound emitting and collecting apparatuses 1a
to 1d which receives the audio signal and the like through the transmission line has the
arrangement pattern of each sound emitting and collecting apparatus 1, the identification
number H5 included in the control information, and the identification number of the own
apparatus. Based on H1 to H4, the positional relationship between the own device and the sound
collection side sound emission and collection device 1e is acquired. The sound emission side
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7
sound emission and collection devices 1a to 1d are uttered from the sound collection side sound
emission and collection device 1e side on the basis of the position of the own device according to
this positional relationship, and are in contradiction with the sound collection side sound
emission and collection device 1e. The sound emission directivity is set so that the sound signal is
emitted so as to be propagated to the user side. That is, the sound emitting side sound emitting
and collecting apparatus 1a to 1d emits the sound signal so that the sound propagates from the +
X direction to the -X direction.
[0019]
Further, as shown in FIG. 1C, when the sound collection side sound emission and collection
device 1c at the center of the sound emission and collection device row collects the speech of the
user 2d and generates an audio signal, the sound emission side sound emission and collection
The control signal including the synchronization signal, the identification number H3 of the own
device, and the generated audio signal are transmitted to the devices 1a, 1b, 1d, and 1e through
the transmission line. Each of the sound emitting side sound emitting and collecting apparatuses
1a, 1b, 1d and 1e which has received the audio signal etc. via the transmission line has the
arrangement pattern of each sound emitting and collecting apparatus 1, and identification
number H3 contained in the control information. Based on the identification numbers H1, H2,
H4, and H5 of the devices, the positional relationship between the own device and the sound
collection side sound emission and collection device 1c is acquired. The sound emission side
sound emission and collection devices 1a and 1b are uttered from the sound collection side
sound emission and collection device 1c side on the basis of the position of the own device
according to this positional relationship, and are in contradiction with the sound collection side
sound emission and collection device 1c. The sound emission directivity is set so that the sound
signal is emitted so as to be propagated to the user side. That is, the sound emission side sound
emitting and collecting apparatus 1a and 1b emits the sound signal so that the sound propagates
from the + X direction to the -X direction. The sound emitting and collecting devices 1d and 1e
are uttered from the sound collecting side sound emitting and collecting device 1c side on the
basis of the position of the own device according to this positional relationship, and to the side
opposite to the sound collecting side sound emitting and collecting device 1c. The sound
emission directivity is set so as to be propagated and the sound signal is emitted. That is, the
sound emission side sound emitting and collecting apparatus 1 d and 1 e emits the sound signal
so that the sound propagates from the −X direction to the + X direction.
[0020]
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8
As described above, the sound collecting side sound emitting and collecting device 1 does not
emit the sound signal collected by the own device, and the sound emitting side sound emitting
and collecting device 1 collects the sound based on the position of the own device. The sound
emission directivity is set so as to be uttered from the sound emission and collection device 1
side and propagated to the side opposite to the sound collection side sound emission and
collection device 1, and the sound signal is emitted. As a result, the sound emitted from each
sound emission side sound emission and collection device 1 sounds to each user as if it is
transmitted from the direction of the sound collection side sound emission and collection device
1, so that a more realistic sounding is realized it can. Furthermore, since the sound collecting
area of the sound collecting side sound emitting and collecting apparatus 1 becomes a blind spot
of the sound emitting area of each sound emitting side sound emitting and collecting apparatus 1
by such processing, the sound collecting side sound emitting and collecting apparatus 1 It is
possible to prevent the generation of howling because the sound signals emitted by each of the
sound emission side sound emission and collection devices are hardly collected.
[0021]
Further, a loudspeaker system can be configured only by connecting a plurality of sound emitting
and collecting apparatuses 1 by a transmission line. Therefore, the loudspeaker system can be
easily installed in a conference room, and an optimum configuration can be easily realized
according to the specifications of the conference room.
[0022]
Next, the functional configuration of the sound emission and collection device 1 will be described
with reference to FIG. As shown in FIG. 2, the sound emission and collection device 1 includes a
control unit 10, an input / output connector 11, a communication control unit 12, a sound
emission directivity control unit 13, a D / A converter 14, an amplifier 15, a speaker array SPA,
and a microphone. It comprises an array MA10, MA20, an amplifier 16, an A / D converter 17,
sound collection beam generation units 181 and 182, a sound collection beam selection unit 19,
and an echo canceller 20.
[0023]
The control unit 10 controls the communication control unit 12 and the sound emission
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9
directivity control unit 13 based on input information from the operation unit (not shown).
Further, when the control information is input from the communication control unit 12, the
control unit 10 refers to the array pattern information and emits noise based on the
identification number included in the control information and the identification number of the
own device. Decide. When an internal operation clock is input from the communication control
unit 12, the control unit 10 controls the sound emission directivity control unit 13 based on the
internal operation clock.
[0024]
The communication control unit 12 includes a connection detection unit 121 and a PLL 122, and
is connected to the transmission line or the network 3 through the input / output connector 11.
The communication control unit 12 converts data into a data format corresponding to the
transmission line or the network 3 when transmitting / receiving data via the transmission line or
the network 3. The connection detection unit 121 detects whether or not the transmission line is
connected. That is, the connection detection unit 121 detects whether or not the other sound
emitting and collecting apparatus 1 is connected to both ends of the own apparatus, and whether
or not only one is connected. The PLL 122 generates a synchronization signal and an internal
operation clock. The synchronization signal generated by the PLL 122 is used for
synchronization with another sound emission and collection device 1, or used for sound emission
control or the like. For this reason, one of the plurality of sound emission and collection devices 1
is in a position to first generate and transmit a synchronization signal, and generates a
synchronization signal based on the output from the crystal oscillator to produce another sound
emission and collection device At the same time, the internal operation clock is generated and
output to the control unit 10. On the other hand, the other sound emission and collection device
1 generates a synchronization signal based on the received synchronization signal and transmits
it to the other sound emission and collection device 1 and generates an internal operation clock
and outputs it to the control unit 10 .
[0025]
As processing on the transmission side, the communication control unit 12 releases the sound
collection beam signal MB0 ′ input from the echo canceller 20, the control information input
from the control unit 10, and the synchronization signal generated by the PLL 122 from the
other release. Transmit to sound collection device 1. At this time, the communication control unit
12 causes the connection detection unit 121 to detect an effective transmission line, that is, the
transmission line to which the sound emission and collection device 1 is connected, and
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10
transmits the sound collection beam signal MB0 ′ to the transmission line. . Further, the
communication control unit 12 outputs the sound emission signal MB1 received through the
transmission line (a sound collection beam MB0 'received from the other sound emitting and
collecting apparatus 1 through the transmission line as a process on the reception side. It is
referred to as signal MB1. ) Is output to the sound emission directivity control unit 13 via the
echo canceller 20, and the control information received via the transmission line is output to the
control unit 10.
[0026]
The sound emission directivity control unit 13 performs delay processing corresponding to each
of the speakers SP1 to SP3 constituting the speaker array SPA with respect to the input sound
emission signal MB1 based on the control information given from the control unit 10. And an
amplitude process and the like to generate emitted sound signals corresponding to the respective
speakers SP1 to SP3 and output them to the D / A converter 14. Further, the sound emission
directivity control unit 13 performs synchronization processing of the sound emission sound
signal based on the instruction of the control unit 10.
[0027]
Each D / A converter 14 converts the input emitted sound signal into a digital signal and
converts it into an analog signal and supplies it to each amplifier 15. Each amplifier 15 amplifies
the analogized emitted sound signal to obtain each speaker SP1. Give to ~ SP3. Each of the
speakers SP1 to SP3 emits the input emitted sound signal.
[0028]
The microphones MIC11 to MIC17 and MIC21 to MIC27 constituting the microphone arrays
MA10 and MA20 pick up surrounding sounds including voices from the user 2 present in the
periphery of the own apparatus to obtain an electrical collected voice signal And give to the
amplifier 16. The amplifier 16 amplifies the collected voice signal and supplies it to the A / D
converter 17. The A / D converter 17 converts the collected voice signal in analog form into a
digital signal and outputs it to the voice collection beam generators 181 and 182. .
04-05-2019
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[0029]
The sound collection beam generation units 181 and 182 perform delay processing and
amplitude processing of the respective collected sound signals for each of the sound collection
directivity patterns set in advance, and thereby a plurality of sound collection directivity based
on the respective sound collection directivity. Beam signals MB11 to MB14 and MB21 to MB24
are generated.
[0030]
The sound collection beam selection unit 19 selects the sound collection beam signal MB0
having the highest signal level and outputs the sound collection beam signal MB0 to the echo
canceller 20.
[0031]
The echo canceller 20 comprises an adaptive filter 201 and a post processor 202.
The adaptive filter 201 generates a pseudo-regression sound signal based on the sound emission
signal MB1.
The post processor 202 subtracts the pseudo-regression sound signal of the sound emission
signal MB1 from the sound collection beam signal MB0 output from the sound collection beam
selection unit 19, and outputs the result as the sound collection beam signal MB0 'to the
communication control unit 12. . Thereby, the wraparound sound from the speaker SP to the
microphone MIC is suppressed.
[0032]
Next, the flow of processing from the sound collection of the sound collection side sound
emission and collection device 1 to the sound emission of the sound emission side sound
collection and collection device 1 will be described with reference to FIG. Here, as shown to FIG.
1 (A), the case where the sound signal which the sound emission and collection apparatus 1a
collected the sound is emitted from the other sound emission and collection apparatuses 1b-1e is
mentioned as an example, and is demonstrated.
04-05-2019
12
[0033]
When the sound emission and collection device 1a collects the voice of the user 2a (S101), the
sound collection beam generation units 181 and 182 generate sound collection beam signals
MB11 to MB14 and MB21 to MB24 (S102). The sound collection beam selection unit 19 of the
sound emission and collection device 1a selects the sound collection beam signal MB0 and
outputs it to the communication control unit 12 via the echo canceller 20 (S103). At this time,
the method of selecting the collected beam signal MB0 by the collected beam selection unit 19
selects a beam signal having the highest signal level as the collected beam signal MB0 from the
collected beam signals MB11 to MB14 and MB21 to MB24. Do.
[0034]
The communication control unit 12 of the sound emission and collection device 1a determines
the presence or absence of the synchronization signal (S104). If there is no synchronization
signal (S104: No), a synchronization signal is generated (S105), and the process proceeds to step
S106. If the synchronization signal is present (S104: Yes), the process proceeds to step S106.
[0035]
In step S106, the communication control unit 12 of the sound emission and collection device 1a
releases the collected sound beam signal MB0 ′, control information including the identification
number H1 of the own device, and the synchronization signal through the transmission line. It
transmits to sound collection apparatus 1b-1e.
[0036]
Hereinafter, the case where the sound emission and collection device 1b receives the sound
emission signal MB1 and the like will be described as an example.
Also in the sound emission and collection devices 1c to 1e, the same processing as the sound
emission and collection device 1b is performed.
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[0037]
When the sound emission and collection device 1b receives the sound emission signal MB1, the
control information, and the synchronization signal through the transmission line (S111), the
control unit 10 refers to the array pattern and identifies the identification number included in the
control information. The positional relationship between the sound emission and collection
device 1a and the own device, from which the sound emission signal MB1 is collected from H1
and the identification number H2 of the own device, is analyzed (S112). The sound emission
directivity control unit 13 of the sound emission and collection device 1b generates the sound
emission direction of the sound emission signal MB1 as if the sound emission is generated from
the sound emission and collection device 1a based on the positional relationship analyzed by the
control unit 10. Control is performed (S113), and an emitted sound signal corresponding to each
of the speakers SP1 to SP3 constituting the speaker array SPA is generated (S114). The sound
emission directivity control unit 13 performs synchronization processing of the sound emission
sound signal based on the instruction of the control unit 10 (S115). Then, the emitted sound
signal is emitted from each of the speakers SP1 to SP3 (S116). Thus, the sound emission and
collection devices 1b to 1d complete the emission of the audio signal collected by the sound
emission and collection device 1a.
[0038]
Here, the method of determining the emission directivity is described. As described above, when
a plurality of sound emitting and collecting apparatuses 1 are disposed on a straight line, even
when reference is made to the identification number without referring to the array pattern
information at the timing of determining the emission directivity. Good. For example, the
identification number of each sound emitting and collecting device 1 is assigned in ascending
order from the sound emitting and collecting device 1 arranged at the -X direction end to the
sound emitting and collecting device 1 arranged at the + X direction end. In this case, each sound
emitting and collecting device 1 may determine the sound emission direction by comparing the
identification number Hm of the own device with the identification number Hn included in the
control information at the timing of determining the sound emission directivity. it can. That is, in
the case of m (identification number of the sound emitting side sound emitting and collecting
device 1) <n (identification number of the sound collecting side sound emitting and collecting
device 1), the sound emission directivity is set to emit in the −X direction. It controls, and in the
case of m> n, controls the radiation directivity so as to emit in the + X direction. Note that such
determination of the identification numbers in ascending order is an example, and when the
identification numbers are set in descending order, the sound emission direction can be
determined in the same manner.
04-05-2019
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[0039]
Next, an example other than the arrangement pattern in which the plurality of sound emission
and collection devices 1 are arranged in a straight line will be described with reference to FIGS.
[0040]
(In the Case of L-Shaped Array) FIG. 4 is an explanatory diagram of an L-shaped array pattern.
FIG. 4 (A) shows the case where the sound emission and collection device at the array end
becomes the sound collection side sound emission and collection device, and FIG. 4 (B) shows the
sound emission and collection device near the L-shaped bent portion. The case where the sound
side sound emission and collection device is realized
[0041]
The arrangement pattern information stores the arrangement pattern and the sound emission
directivity for each of the sound emission side sound emission and collection devices 1 based on
the position information of the sound collection side sound emission and collection device 1 in
the array pattern. That is, the arrangement pattern information is obtained for the sound
emission directivity of the sound emission side sound emission and collection device 1 based on
the positional relationship between the sound collection side sound emission and collection
device 1 and the sound emission side sound emission and collection device 1 for each array
pattern. Remember.
[0042]
As shown in FIG. 4, the sound emission and collection devices 1a to 1c are disposed on a straight
line, the sound emission and collection device 1c is disposed perpendicular to the sound emission
and collection device 1d, and the sound emission and collection devices 1d and 1e are arranged
on a straight line. Be done. That is, the plurality of sound emission and collection devices 1a to 1e
are arranged in an L shape. A user 2 is present around each sound emitting and collecting device
1.
04-05-2019
15
[0043]
As shown in FIG. 4 (A), when the user 2a makes a speech, the sound collection side sound
emission and collection device 1a picks up the speech of the user 2a and generates an audio
signal. The sound collection side sound emission and collection device 1a transmits an audio
signal, control information, and a synchronization signal to the sound emission side sound
collection and collection devices 1b to 1e. Then, the sound emission side sound emission and
collection devices 1b to 1e determine the sound emission directivity based on the identification
number of the own device and the received control information with reference to the
arrangement pattern information stored in the own device. A synchronization process is
performed based on the received synchronization signal to emit sound. In this case, the sound
emission side sound emission and collection devices 1b to 1e perform sound emission directivity
control so that sound emission is performed from the sound collection side sound emission and
collection device 1a side based on the position of the own device.
[0044]
As shown in FIG. 4 (B), when the user 2d makes a speech, the sound collection side sound
emission and collection device 1c picks up the speech of the user 2d and generates an audio
signal. An audio signal, control information, and a synchronization signal are transmitted to the
sound emission side sound emission and collection device 1a, 1b, 1d, 1e. Then, the sound
emission side sound emission and collection devices 1a, 1b, 1d, 1e refer to the arrangement
pattern information stored in the own device, and emit radiation based on the identification
number of the own device and the received control information. The nature is determined, and
synchronization processing is performed based on the received synchronization signal to emit
sound. In this case, the sound emission side sound emission and collection devices 1a, 1b and 1e
perform sound emission directivity control so that the sound is emitted from the sound collection
side sound emission and collection device 1c side based on the position of the own device. The
sound emission side sound emission and collection device 1d emits sound only on the side
opposite to the sound collection side sound emission and collection device 1c with reference to
the position of the own device, and the sound collection side sound emission and collection
device 1c does not emit sound. This is because the space between the sound collecting side
sound emitting and collecting device 1c and the sound emitting side sound emitting and
collecting device 1d is bent by about 90 degrees, so that the sound collecting side sound emitting
and collecting device 1c and the sound emission side sound emitting and collection This is
because the device 1d is located linearly close to the user 1d and the user 2l on the sound
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collection side sound collection and collection device 1c side can easily hear the user's 2d's voice.
[0045]
(Case of U-Shaped Array) FIG. 5 is an explanatory view of a U-shaped array pattern. FIG. 5 (A)
shows the case where the sound emission and collection device at the end of the array becomes
the sound collection side sound emission and collection device, and FIG. 5 (B) shows the sound
collection and release device at the center of the arrangement side as the sound collection side
sound emission and collection device Indicates when it has become.
[0046]
As shown in FIG. 5, the sound emission and collection devices 1a and 1b are disposed in a
straight line, the sound emission and collection device 1c is disposed perpendicularly to the
sound emission and collection devices 1b and 1d, and the sound emission and collection devices
1d and 1e are in a straight line. Will be placed. That is, the plurality of sound emission and
collection devices 1a to 1e are arranged in a U-shape. A user 2 is present around each sound
emitting and collecting device 1.
[0047]
As shown in FIG. 5A, when the user 2a makes a speech, the sound collection side sound emission
and collection device 1a picks up the speech of the user 2a and generates an audio signal. The
sound collection side sound emission and collection device 1a transmits an audio signal, control
information, and a synchronization signal to the sound emission side sound collection and
collection devices 1b to 1e. Then, the sound emission side sound emission and collection devices
1b to 1e determine the sound emission directivity based on the identification number of the own
device and the received control information with reference to the arrangement pattern
information stored in the own device. The synchronization processing is performed based on the
received synchronization signal, and the noise is emitted. In this case, the sound emission side
sound emission and collection devices 1b to 1e perform sound emission directivity control so
that sound emission is performed from the sound collection side sound emission and collection
device 1a side based on the position of the own device.
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[0048]
When the distance between the sound collecting side sound emitting and collecting device 1a
and the sound emitting side sound emitting and collecting device 1e is short, the sound emitting
side sound emitting and collecting device 1e is determined based on the position of the own
device. Only the opposite side to the device 1a is emitted, and the sound collecting side sound
emitting and collecting device 1a does not emit sound. This is in such a positional relationship
that the user 2 n on the sound collecting side sound emitting and collecting device 1 a side of the
sound emitting side sound emitting and collecting device 1 e can directly hear the user 2 a's
voice by the U-shaped array pattern. It is from. Moreover, it is for the sound collection side sound
emission and collection device 1a not to collect the sound signal emitted by the sound emission
side sound collection and collection device 1e.
[0049]
As shown in FIG. 5 (B), when the user 2d makes a speech, the sound collection side sound
emission and collection device 1c picks up the speech of the user 2d and generates an audio
signal. The sound collection side sound emission and collection device 1c transmits the sound
signal, the control information, and the synchronization signal to the sound emission side sound
collection and collection device 1a, 1b, 1d and 1e. Then, the sound emission side sound emission
and collection devices 1a, 1b, 1d, 1e refer to the arrangement pattern information stored in the
own device, and emit radiation based on the identification number of the own device and the
received control information. The nature is determined, and synchronization processing is
performed based on the received synchronization signal to emit sound. In this case, the sound
emission side sound emission and collection devices 1a and 1e perform sound emission
directivity control so that the sound is emitted from the sound collection side sound emission
device 1c with reference to the position of the own device. The sound emission side sound
emission and collection devices 1b and 1d emit sound only on the opposite side of the sound
collection side sound emission and collection device 1c with reference to the position of the own
device, and the sound collection side sound emission and collection device 1c does not emit
sound. This is because the users 2 j and 2 l on the sound collecting side sound emitting and
collecting device 1 c side of the sound emitting side sound emitting and collecting devices 1 b
and 1 d can directly hear the user's 2 d's voice by the U-shaped array pattern. It is because it is in
a positional relationship.
[0050]
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As described above, the sound emission side sound emission and collection device 1 emits sound
based on the arrangement pattern information, the identification number of the sound collection
side sound emission and collection device 1 included in the control information, and the
identification number of the own device. Determine the directivity. The sound emission side
sound emission and collection device 1 performs sound emission directivity control as if the
sound is emitted from the sound collection side sound emission and collection device 1 side with
reference to the position of the own device. Thereby, since the sound collection side sound
emission and collection device 1 does not collect the sound signal generated by the own device,
howling can be prevented.
[0051]
In the above description, the case where one audio signal is output by one audio collecting device
is described, but when a plurality of audio emitting devices function as a audio collecting device,
that is, Even when a plurality of audio signals are simultaneously generated and transmitted, the
above configuration and processing can be used.
[0052]
When a plurality of sound emission and collection devices function as a collection side sound
emission and collection device, each sound collection side sound emission and collection device
does not emit sound signals collected by the own device, and is collected by another device. With
regard to an audio signal (an audio signal input via a transmission line), it functions as the abovedescribed sound emitting side sound emitting and collecting device.
That is, when an audio signal is input through the transmission line, the emission directivity
control is performed according to the positional relationship between the other sound emitting
and collecting apparatus that is the generation source of the input audio signal and the own
apparatus.
[0053]
On the other hand, the sound emitting and collecting apparatus not collecting sound, that is, the
above-mentioned sound emitting side sound emitting and collecting apparatus performs the
04-05-2019
19
above-mentioned sound emission directivity control for each of a plurality of audio signals input
through the transmission line. . That is, the positional relationship between each sound emitting
and collecting apparatus that is the generation source of the plurality of input audio signals and
the own apparatus is individually determined. The sound emission side sound emission and
collection device sets the sound emission directivity individually for each audio signal from each
of the sound collection side sound emission and collection devices, and realizes directivity that
combines the plurality of sound emission directivitys. Generate and emit an emitted sound signal.
[0054]
In addition, the sound emission side sound emission and collection device which inputted the
plurality of sound signals explained just before if the sound collection side sound emission and
collection device also inputs the sound signal from other sound emission and collection devices
connected to the transmission line Do the same sound emission processing as.
[0055]
By performing such a configuration and processing, even if a plurality of speakers are collected
by different sound emitting and collecting apparatuses, the voices of the respective speakers are
emitted from the respective sound collecting side sound emitting and collecting apparatuses. You
can do so.
At this time, since the sound emission sound from the other device based on each sound
collection does not wrap around in each sound collection side sound collection device, howling
can be prevented by all the sound collection side sound collection devices.
[0056]
In addition, voices of a plurality of speakers can be collected by one sound emitting and
collecting device. In this case, the sound collection beam selection unit selects a sound collection
beam signal equal to or higher than a preset sound detection threshold and individually performs
echo cancellation. Then, the echo-canceled sound collection beam signals are synthesized and
output. This is because a plurality of speakers collected by one sound emission and collection
device can be regarded as substantially the same direction for a conferee who is present in the
sound emission range of another sound emission and collection device. Even if the voice of the
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speaker is synthesized and output, it does not give much discomfort.
[0057]
Next, the case where the above-described loudspeaker system is connected to an external
network will be described with reference to FIG. FIG. 6 is an explanatory view of a loudspeaker
system connected to an external network, that is, a loudspeaker system with a voice
communication function.
[0058]
As shown in FIG. 6, in the voice communication system, the loud-sound system has the abovementioned loud-sound system in which a plurality of sound emitting and collecting devices 1 are
connected in a straight line via a transmission line; The voice communication device 1 is
connected to the voice communication device 1a via the network 3, for example, a voice
communication device at a remote place.
[0059]
The sound emission and collection devices 1a to 1e in the loud sound system perform sound
emission and collection as described above.
That is, when the sound emitting and collecting apparatuses 1b to 1e connected by the
transmission line receive the audio signal collected by the sound collecting side sound emitting
and collecting apparatus 1a, each of the sound emitting side sound emitting and collecting
apparatuses 1b to 1e The emission directivity is determined based on the identification number
and the received control information. The sound emission side sound emission and collection
devices 1b to 1e perform sound emission directivity control so that sound is emitted from the
sound collection side sound emission and collection device 1a side with reference to the own
device (broken line in FIG. 6).
[0060]
Further, when receiving the audio signal via the network 3, the sound emission and collection
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device 1a registers, as control information, that the audio signal is from an audio communication
device at a remote location connected via the network 3. The sound emission and collection
device 1a associates this loud sound system external sound signal with control information
indicating that the loud sound system external sound signal, and transmits it to the other sound
emission and collection devices 1b to 1e in the loud sound system. . The sound emitting and
collecting device 1a emits the sound signal received via the network 3 together with the
transmission processing for each of the sound emitting and collecting devices 1b to 1e in the
sound amplification system. The other sound emitting and collecting apparatuses 1b to 1e in the
loudspeaker system, upon receiving the audio signal, refer to the control information and judge
that the audio signal is an audio signal outside the loudspeaker system. The sound emitting and
collecting apparatuses 1b to 1e store in advance sound emission directivity patterns for the audio
signal outside the loud speaker system, and emit the external sound signal outside the
loudspeaker system according to the directivity pattern, or are included in the control
information. Based on the speaker orientation information to be output, an audio signal outside
the loudspeaker system is emitted.
[0061]
On the other hand, when each sound emitting and collecting apparatus 1 in the sound
amplification system generates an audio signal, it transmits to the sound emitting and collecting
apparatus 1a together with the control information and the synchronization signal. When the
sound emission and collection device 1a receives an audio signal or the like via the transmission
line, the sound emission and collection device 1a transmits the audio signal from within the
sound amplification system to the audio communication device at a remote location via the
network 3.
[0062]
With this configuration, the voice in the loudspeaker system can be amplified and transmitted to
the outside, and the voice outside the loudspeaker system can be received and emitted in the
loudspeaker system. That is, both of the loudspeaker system and the voice communication
system can be realized simultaneously.
[0063]
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By the way, the sound emission directivity pattern of the speech signal outside the loud sound
system is set, for example, with directivity different from all the sound emission directivity
patterns for the sound collected in the sound amplification system. As a specific example, since
some directivity is always set for voice in the loudspeaker system, non-directivity is not set for
the voice signal outside the loudspeaker system in the specific direction (FIG. 6). Solid line). In
this way, by emitting the voice signal via the network 3 in a directivity pattern different from that
of the voice signal in the loudspeaker system, for example, omnidirectional, the voice inside and
outside the loudspeaker system, ie the voice in the same room and via the network 3 Users can
easily identify voices from other locations.
[0064]
In the present embodiment, the loud sound system is configured using five sound emitting and
collecting devices 1, but the loud sound system may be configured using plural sound emitting
and collecting devices 1.
[0065]
Further, in the present embodiment, as the arrangement pattern of the plurality of sound
emission and collection devices 1, L-shaped and U-shaped on a straight line have been described
as an example, but the present invention is not limited thereto. Good.
By registering the sound emission directivity of each sound emitting side sound emitting and
collecting device 1 according to the position of the sound collecting side sound emitting and
collecting device 1 in the arrangement pattern information, it is possible to cope with any array
pattern. it can.
[0066]
It is an explanatory view of a loud-sound system provided with a plurality of sound emission and
collection devices. It is a block diagram showing functional composition of a sound emission and
collection device which constitutes a loud-sound system. It is a flow chart which shows a flow of
processing after sound collection side sound emission and collection device collects sound until
sound emission side sound emission and collection device emits sound. It is explanatory drawing
of the L-shaped sequence pattern. It is explanatory drawing of a U-shaped arrangement pattern.
It is explanatory drawing of the loud-sound system with a voice communication function.
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Explanation of sign
[0067]
1 (1a to 1e)-sound emitting and collecting apparatus, 2 (2a to 2n)-user, 3-network, 10-control
unit, 11-input / output connector, 12-communication control unit, 13-sound emission directivity
control unit , 14-D / A converter, 15, 16-amplifier, 17-A / D converter, 19-sound collection beam
selection unit, 20-echo canceller, 121-connection detection unit, 122-PLL, 181, 182- sound
collection Beam generator, 201-adaptive filter, 202-post processor, H1 to H5 identification
number, MA-microphone array, MB-beam signal, SPA-speaker array
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