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JP2010161613

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DESCRIPTION JP2010161613
[PROBLEMS] To provide a loudspeaker system which has high versatility and can be
appropriately coped with even when a microphone or a speaker moves. A plurality of connection
terminals 2 are connected to a central control unit 1. The speaker operates the central control
device 1 and instructs each connected terminal 2 to function as a speaker or function as a
microphone. Since it is possible to instruct which connected terminal 2 is made to function as a
microphone and to function as a speaker from the central control unit 1, when the speaker is
speaking, when the questioner is asking questions, the facilitator When commenting, etc., the
speaker can switch the position and number of microphones and speakers with one touch
depending on the scene in the lecture. For example, there is no need for the assistant to bring the
microphone to the questioner, and it is possible to respond appropriately according to the
movement of the speaker, and the versatility and convenience are extremely high. [Selected
figure] Figure 1
Loudspeaker system
[0001]
The present invention relates to a loudspeaker system installed in a large space such as a hall.
[0002]
Conventionally, when a loudspeaker system is installed in a large space such as a hall, directivity
of sound collection and directivity of noise become problems.
09-05-2019
1
That is, the speech of the speaker (speaker) must be picked up with a high SN ratio, and the
speech of the speaker must be properly transmitted to the position of the listener.
[0003]
For example, Patent Document 1 proposes a method in which speakers are distributed on a
ceiling to realize uniform sound pressure characteristics at the position of a listener.
[0004]
JP, 2004-112283, A
[0005]
However, since the speaker system of Patent Document 1 is provided with a speaker on a ceiling
or the like, the degree of freedom of installation is low and there is no versatility.
In addition, because it is equipped, initial installation cost also increases.
[0006]
Furthermore, in the speaker system of Patent Document 1, the sound collecting side
(microphone) is not considered, and the convenience in the case where the speaker moves is not
considered.
In addition, when the speaker moves, the acoustic feedback system may change, and the sound
amplification state may become unstable.
[0007]
Therefore, it is an object of the present invention to provide a loudspeaker system which is
highly versatile and can be appropriately dealt with even when the speaker moves.
09-05-2019
2
[0008]
The loudspeaker system according to the present invention is a loudspeaker system comprising a
central control unit and a connection terminal connected to the central control unit, wherein the
central control unit causes each connection terminal to function as a speaker or functions as a
microphone. Control signal that indicates whether or not to be input, and an audio signal from a
connected terminal that functions as a microphone to generate a sound collection signal, and
generate a sound emission signal based on the sound collection signal, and a speaker An audio
signal processing unit for outputting to a connecting terminal to function as the connecting
terminal, wherein the connecting terminal is operated as a microphone from the central control
device, a sound collecting unit for collecting sound, a sound emitting unit for emitting sound, and
When a control command is input, the control unit causes the sound collected by the sound
collection unit to be output to the audio signal processing unit of the central control device, and
causes the audio signal processing unit to function as a speaker. When receiving the command,
characterized in that and a terminal control circuit which sound is output from the sound
emitting unit on the basis of the sound signal input from the audio signal processing unit of the
central control unit.
[0009]
As described above, the central control unit collectively controls the plurality of connected
terminals to easily change whether it functions as a speaker or a microphone, so that the speaker
and the microphone can be selected according to the scale of the hall. The number of installation
positions can be easily changed.
[0010]
In addition, since it is possible to instruct which connected terminal to function as a microphone
and function as a speaker from the central control device, when the speaker is speaking, when
the questioner is asking questions, the facilitator When commenting, etc., the speaker (or
assistant) can switch the position of the microphone or the speaker with one touch depending on
the scene in the lecture.
For example, there is no need for the assistant to bring the microphone to the questioner, and it
is possible to respond appropriately according to the movement of the speaker, and the
versatility and convenience are extremely high.
[0011]
09-05-2019
3
Further, in the loudspeaker system according to the present invention, in the above-mentioned
invention, the audio signal processing unit includes adaptive regression sound removal means for
removing pseudo regression sound from a collected sound signal, and a plurality of initial
parameters of the adaptive regression sound removal means. The central control apparatus
further comprises: a measuring unit configured to measure a plurality of the initial parameters by
measuring an acoustic feedback system with respect to a plurality of connected terminal control
modes and to store the plurality of initial parameters in the storage unit. It features.
[0012]
In this case, an adaptive howling canceller (or echo canceller) is built in, and at the time of
installation (at the time of calibration), acoustics for a plurality of connected terminal control
modes (various patterns of which connected terminals function as a microphone and a speaker)
Measure the feedback system.
The initial parameters (filter coefficients etc.) are stored according to each measured acoustic
feedback system, and when the speaker and microphone patterns are switched at the time of the
lecture, the initial parameters are automatically read out, so the sound amplification state
becomes unstable. It will never be.
[0013]
In the loudspeaker system according to the present invention, in the above-mentioned invention,
the sound pickup unit includes a microphone array including a plurality of microphones, and the
sound output unit includes a speaker array including a plurality of speakers. .
[0014]
In this case, the directivity is controlled by the speaker array and the microphone array.
For example, when the connecting terminal is installed near the side wall surface of the room, the
listener is facing the front direction, so the direction of sound collection and the direction of the
listener are orthogonal, but sound emission directivity and collection By directing the sound
directivity to the direction of the listener, the SN ratio can be secured.
09-05-2019
4
[0015]
Further, according to the loudspeaker system of the present invention, in the above-mentioned
invention, the control circuit of the central control device sets a channel of each connected
terminal, and the audio signal processing unit inputs an audio signal from the connected terminal
for each channel. It is also possible to configure so as to generate a sound collection signal of
each channel and a sound emission signal, and to output the sound emission signal of each
channel to the connection terminal of the same channel.
[0016]
As described above, it is also possible to configure so as to set a connected terminal for dividing
the sound collection signal into a plurality of channels and outputting the same.
Even when different lectures are given in the same venue, just by operating the central control
unit 1, different sounds are collected and emitted for each place, and it is possible to easily divide
the lectures.
[0017]
According to the present invention, the versatility is high, and it is possible to appropriately cope
with the case where the microphone or the speaker moves.
[0018]
It is a figure showing composition of a loudspeaker system.
It is a figure showing composition of a loudspeaker system.
It is a block diagram which shows the structure of a central control unit.
It is a block diagram which shows the structure of a connection terminal. FIG. 2 is a block
diagram showing a detailed configuration of an audio signal processing unit 12; It is a figure
09-05-2019
5
which shows the structure of the loud-sounding system in the case of dividing | segmenting a
collection signal into several channels.
[0019]
Hereinafter, a loudspeaker system (sound emission system) according to an embodiment of the
present invention will be described with reference to the drawings. FIG. 1 is a diagram showing
an overall configuration of a loudspeaker system.
[0020]
The loudspeaker system according to the present embodiment is installed in a large space such
as a hall, and includes a central control unit 1 and a plurality of connection terminals 2
(connection terminals 2A to 2H) connected to the central control unit 1. . The number of
connected terminals is not limited to the example shown in FIG.
[0021]
In the example of FIG. 1, the speaker 5 is present in front of the venue (upper side of the sheet),
and there are many listeners from the center of the venue to the rear. The central control unit 1
is disposed near the speaker 5 and connected to a plurality of connected terminals 2.
[0022]
The connection terminals 2A to 2H are distributed throughout the hall. For example, the
connecting terminal 2A and the connecting terminal 2B are disposed on the left and right side
wall surfaces in front of the hall so as to sandwich the speaker 5. Moreover, 2 C of connection
terminals and 2 D of connection terminals are arrange | positioned on the side wall surface right
and left so that the front row vicinity of a listener may be pinched. Similarly, the connecting
terminal 2E and the connecting terminal 2F are disposed on the left and right sides of the side
wall so as to sandwich the vicinity of the middle row of the listener. Further, the connecting
terminal 2G and the connecting terminal 2H are disposed on the left and right side wall surfaces
of the rear of the hall so as to sandwich the vicinity of the rear row of the listener.
09-05-2019
6
[0023]
The speaker 5 (or a speaker's assistant or the like) operates the central control device 1 to set the
connecting terminals 2A to 2H as speakers or microphones (see FIGS. 1 and 2). The loudsounding system of this embodiment is capable of easily controlling a plurality of connected
terminals in a central control unit and functioning as a speaker or functioning as a microphone,
and can easily change the size of the venue or the situation. The number of speakers and
microphones, and the installation position can be easily changed according to.
[0024]
FIG. 3 is a block diagram showing the configuration of the central control device 1, and FIG. 4 is a
block diagram showing the configuration of the connection terminal 2. As shown in FIG.
[0025]
The central control unit 1 includes a control circuit 11, an audio signal processing unit 12, and
connection interfaces (I / F) 13A to 13H.
[0026]
The control circuit 11 is connected to a user I / F including a touch panel LCD, a keyboard (key),
a switch (SW) and the like, and receives an operation of the speaker 5.
The control circuit 11 controls the audio signal processing unit 12 according to the operation of
the speaker 5 and controls the connected terminals 2A to 2H through the connected I / Fs 13A
to 13H.
That is, in response to the operation of the speaker 5, the control circuit 11 transmits a control
command to the connection terminals 2A to 2H to function as a microphone or a speaker. The
standard of the connection I / F may be a standard dedicated to the loudspeaker system, or may
be a general-purpose standard such as IEEE 1394 or USB.
09-05-2019
7
[0027]
The audio signal processing unit 12 is connected to an external connection I / F such as a LAN
terminal, an analog audio terminal, and a USB terminal, and audio is input to and output from
these terminals. For example, the sound collected at the venue is output to a terminal such as a
remote conference room via the LAN terminal and the network. In this way, it is possible to
realize a talk between remote places.
[0028]
The audio signal processing unit 12 receives an audio signal collected by the connecting terminal
functioning as a microphone, generates a collected signal, and performs signal processing such
as an equalizer on the collected signal to generate a collected signal. The audio signal processing
unit 12 outputs the generated sound emission signal to a connected terminal that functions as a
speaker.
[0029]
The audio signal processing unit 12 also has a howling suppression function, an echo canceller
(AEC) function, and the like. Specifically, an adaptive howling canceller (or an adaptive echo
canceller) is incorporated which removes the pseudo-regression sound from the voice signal
collected by the connecting terminal 2 functioning as a microphone. The adaptive howling
canceller estimates the transfer function of the acoustic feedback system from the speaker to the
microphone, and filters the emitted signal to generate a pseudo-regression sound.
[0030]
The audio signal processing unit 12 stores a plurality of initial parameters (filter coefficients and
the like) of the adaptive howling canceller. The plurality of initial parameters are obtained by
measurement at the time of installation of the loudspeaker system (during calibration), and are
read out when switching the operation of the loudspeaker system (details will be described later).
09-05-2019
8
[0031]
Next, the configuration and function of the connection terminal will be described with reference
to FIG. In addition, all the connection terminals 2A-2H have the same structure and function.
[0032]
The connection terminal 2 includes a connection I / F 21, a terminal control circuit 22, a
microphone beam generation circuit 23, a speaker signal processing circuit 24, A / D converters
251 to 266, amplifiers for microphones 271 to 286, and D / A converters 291 to 306, amplifiers
311 to 326 for speakers, microphones M101 to M116 (microphone array), and speakers SP1 to
SP16 (speaker array).
[0033]
A control command is input to the coupling I / F 21 from the control circuit 11 of the central
control device 1.
The input control command is input to the terminal control circuit 22. Further, the sound
emission signal is input to the connection I / F 21 from the audio signal processing unit 12 of the
central control device 1.
[0034]
When a control command instructing to function as a microphone is input, the terminal control
circuit 22 sets the microphone beam generation circuit 23 to output an audio signal (microphone
beam signal). In addition, when a control command instructing to function as a speaker is input,
the terminal control circuit 22 sets the microphone beam generation circuit 23 so as not to
output an audio signal, and the speaker signal processing circuit 24 is connected. It is set to emit
sound based on the sound emission signal input from the I / F 21.
[0035]
09-05-2019
9
The microphone beam generation circuit 23 applies a predetermined delay to audio signals
(digitalized by A / D converters 251 to 266) input from a plurality of microphones M101 to
M116 forming a microphone array, and then combines them. And generate a microphone beam
signal. The microphone beam signal is output to the audio signal processing unit 12 of the
central control unit 1 to be a collected signal. The microphone beam generation circuit 23 can set
the directivity of sound collection in various directions by changing the delay amount of each
microphone.
[0036]
The speaker signal processing circuit 24 delays the sound emission signals supplied to the
speakers SP1 to SP16 arranged in an array, and then outputs the sound emission signals to the D
/ A converters 291 to 306. These sound emission signals are analogized, supplied to the
speakers SP1 to SP16, and emitted as sound. The sound emitted from each of the speakers SP1
to SP16 is emphasized in a predetermined direction and becomes a sound emission beam. The
speaker signal processing circuit 24 can set directivity of sound emission in various directions by
changing the delay amount of each speaker.
[0037]
Next, operations of the central control device 1 and the connection terminal 2 will be described
using FIGS. 1 and 2. FIG. 1 is a diagram showing an operation when the speaker 5 is giving a
lecture. In this case, the speaker 5 operates the central control device 1 to instruct setting of the
connected terminals 2A and 2B disposed in front of the hall as a microphone. In addition, the
other connected terminals 2C to 2H are set and instructed as speakers.
[0038]
In this case, voices (microphone beam signals) collected by the connecting terminal 2A and the
connecting terminal 2B are input to the central control device 1 and mixed to form a sound
collection signal. The connected terminal 2A and the connected terminal 2B use the area around
the speaker 5 as the sound collection range (sound collection directivity), and the sound
collection signal includes the speech of the speaker 5.
09-05-2019
10
[0039]
The central control unit 1 performs sound quality adjustment such as equalization on the
collected sound signal, and outputs the sound collected signal to the connection terminals 2C to
2H as a sound emission signal. Since the connected terminals 2C to 2H are distributed in the hall,
the speech of the speaker 5 is spread throughout the hall.
[0040]
On the other hand, as shown in FIG. 2, when a situation occurs in which a part of the listeners (a
questioner) asks a question, the speaker 5 operates the central control unit 1 and places it at a
position near the questioner. The connected terminal (connected terminal 2E, connected terminal
2G, and connected terminal 2H) being set is designated as a microphone. Further, the other
connected terminals 2A to 2D and the connected terminal 2F are set and instructed as speakers.
[0041]
In this case, voices (microphone beam signals) collected by the connecting terminal 2E, the
connecting terminal 2G, and the connecting terminal 2H are input to the central control device 1
and mixed to form a sound collection signal. The connected terminal 2E, the connected terminal
2G, and the connected terminal 2H use the peripheral area of the questioner 7 as the sound
collection range (sound collection directivity), and the sound collection signal includes the speech
of the questioner 7.
[0042]
The central control unit 1 performs sound quality adjustment such as equalization on the
collected sound signal, and outputs it as the sound emission signal to the connected terminals 2A
to 2D and the connected terminal 2F. In this case, the voice of the questioner 7 is uttered to the
speaker 5 (and the entire venue).
[0043]
09-05-2019
11
In addition, although the example which makes a connection terminal function as a speaker or a
microphone was shown in FIG. 1 and FIG. 2, of course, you may make it function both a speaker
and a microphone. For example, in FIG. 2, it is possible to operate the connecting terminal 2E, the
connecting terminal 2G, and the connecting terminal 2H as a microphone and a speaker, and
further to operate the voiced voice of the questioner 7 to be amplified throughout the hall. .
[0044]
Further, in the examples of FIGS. 1 and 2, the central control device 1 shows a configuration in
which all audio signals input from the connecting terminal functioning as a microphone are
mixed and output to all connecting terminals functioning as a speaker. It is also possible to
configure to set a connected terminal that divides the collected sound signal into a plurality of
channels and outputs it. For example, as shown in FIG. 6, it is suitable when giving a different
lecture in the same hall.
[0045]
In the example of FIG. 6, the speaker 5 exists in the front of the hall, and another speaker 9 exists
in the rear of the hall. A listener who exists from the center of the hall to the front listens to the
speech of the speaker 5, and a listener who exists from the center of the hall to the rear listens to
the speech of the speaker 9. Also in this case, the central control device 1 is disposed near the
speaker 5 and connected to the plurality of connection terminals 2.
[0046]
The speaker 5 operates the central control device 1 to instruct setting of the connecting
terminals 2A and 2B arranged in front of the hall as a microphone, and instructs setting of the
connecting terminal 2C and the connecting terminal 2D as speakers. Further, the connection
terminal 2E and the connection terminal 2F are set as a speaker, and the connection terminal 2G
and the connection terminal 2H are set as a microphone.
[0047]
09-05-2019
12
Furthermore, in this example, the speaker 5 operates the central control device 1, and instructs
to set the connected terminals 2A to 2D as an A channel and the connected terminals 2E to 2H as
a B channel. The control circuit 11 of the central control unit 1 instructs the audio signal
processing unit 12 to mix the microphone beam signal input from the connection terminal 2 for
each channel to generate a sound collection signal and a sound emission signal. It is instructed to
output the sound emission signal of each channel to the connection terminal 2 of the same
channel.
[0048]
In this case, voices (microphone beam signals) collected by the connecting terminal 2A and the
connecting terminal 2B are input to the central control device 1 and mixed to be a sound
collection signal of A channel. The connected terminal 2A and the connected terminal 2B use the
area around the speaker 5 as the sound collection range (sound collection directivity), and the
sound collection signal includes the speech of the speaker 5.
[0049]
The central control unit 1 performs sound quality adjustment such as equalization on the sound
collection signal of the A channel, and outputs the sound collection signal as a sound emission
signal to the connected terminal 2C and the connected terminal 2D. In this case, the speech of
the speaker 5 is spread forward from the center of the hall.
[0050]
Further, voices (microphone beam signals) picked up by the connecting terminal 2G and the
connecting terminal 2H are input to the central control device 1 and mixed to become a sound
collecting signal of the B channel. The connected terminal 2G and the connected terminal 2H
have a sound collecting range (sound collecting directivity) around the speaker 9, and the sound
collecting signal includes the speech of the speaker 9.
[0051]
09-05-2019
13
The central control unit 1 performs sound quality adjustment such as equalization on the sound
collection signal of the B channel, and outputs the sound collection signal to the connection
terminal 2E and the connection terminal 2F as a sound emission signal. In this case, the speech of
the speaker 9 is amplified from the center of the hall to the rear.
[0052]
As described above, even when different lectures are given in the same venue, the number of
speakers and microphones and the installation position can be easily changed simply by
operating the central control unit 1, and it is possible to easily give up lectures. It can be divided.
[0053]
Next, measurement of the initial parameter of the adaptive howling canceller in the audio signal
processing unit 12 and the read operation at the time of operation switching will be described.
[0054]
FIG. 5 is a functional block diagram of the audio signal processing unit 12.
These functional units can be realized by hardware, and can also be realized by software (by one
or more CPUs or DSPs).
[0055]
The audio signal processing unit 12 includes a sound collection signal generation function 121,
an adder 122, a signal adjustment function 123, a sound emission signal generation function
124, a delay 125, an FIR filter 126, and a measurement function 127.
[0056]
As described above, the sound collection signal generation function 121 mixes the microphone
beam signal input from the connection terminal 2 functioning as a microphone to generate a
sound collection signal.
09-05-2019
14
The collected sound signal is filtered by the adder 122 to remove the pseudo regressive sound,
and is input to the signal adjustment function 123.
[0057]
The signal adjustment function 123 performs sound quality adjustment such as equalizing on the
collected sound signal, and outputs it to the sound emission signal generation function 124 and
the delay 125.
Also, when instructed to output a measurement signal (white noise or the like) from the
measurement function 127, the measurement signal is output to the sound emission signal
generation function 124 and the delay 125. The sound emission signal generation function 124
generates a sound emission signal from the sound collection signal (or the measurement signal)
after the sound quality adjustment, and outputs the sound emission signal to the connection
terminal 2 functioning as a speaker.
[0058]
The delay 125 adds a delay amount corresponding to the delay of the acoustic feedback system
(the delay from the speaker to the microphone) to the signal input from the signal adjustment
function 123, and outputs the delay amount to the FIR filter 126.
[0059]
The FIR filter 126 is set with filter coefficients simulating a transfer function of an acoustic
feedback system, and generates a pseudo-regression sound signal based on the delayed signal.
The pseudo-regression sound signal is output to the adder 122 and removed from the collected
signal.
[0060]
The sound pickup signal (residue signal) after removal of the pseudo-regression sound signal is
input to the FIR filter 126 and used to update the filter coefficient.
09-05-2019
15
[0061]
Here, when the measurement function 127 instructs the measurement of the acoustic feedback
system at the time of installation of the loudspeaker system or the like at the time of installation
of the loudspeaker system, etc., the control circuit 11 microphones some of the connected
terminals 2 (for example, connected terminals 2A and 2B) It instructs the other part of connected
terminals 2 (for example, connected terminals 2C to 2H) to function as a speaker.
The measurement function 127 sets the signal adjustment function 123 to output a
measurement signal, and reads the filter coefficient of the FIR filter 126. The measurement
function 127 stores the read filter coefficient in the built-in memory (not shown). The
measurement function 127 instructs the output of the measurement signal, and after a certain
amount of time has elapsed (after the application of the FIR filter 126 progresses), reads the filter
coefficient and stores it in the built-in memory.
[0062]
The measurement function 127 performs such measurement operation a plurality of times while
changing the operation pattern of the speaker and the microphone of the connection terminal 2.
Then, filter coefficients for each pattern are stored in association with each other. Although it is
ideal to measure the filter coefficients in all patterns, it is also possible to measure only the
patterns instructed by the speaker or the like.
[0063]
Then, when the speaker or the like switches the connecting terminal to function as a speaker or a
microphone during actual use (during a lecture) of the loudspeaker system, the measurement
function 127 receives information indicating the operation pattern of the speaker and the
microphone from the control circuit 11 The filter coefficient stored in the built-in memory is read
out and set in the FIR filter 126.
[0064]
As described above, the loudspeaker system of this embodiment measures the filter coefficients
of the FIR filter for which adaptation has been advanced to some extent at the time of
09-05-2019
16
installation, and immediately reads out even when the acoustic feedback system changes.
Switching to the filter coefficients for which adaptation has been advanced, and the loudspeaker
system does not become unstable.
[0065]
In the above example, the filter coefficient of the FIR filter is read out and stored. However, the
parameter for updating the filter coefficient such as the step size may be changed.
That is, when a speaker etc. switches the connected terminal to function as a speaker or a
microphone during actual use (during a lecture) of the loudspeaker system, the measurement
function 127 sets the step size etc. of the FIR filter 126 so that the update becomes faster. Then,
after adaptation has progressed to some extent, it is set to return to the original step size etc.
As described above, setting the filter coefficient to be updated faster only when the acoustic
feedback system changes does not cause the loudspeaker system to become unstable.
[0066]
1-Central control unit 2A-2H-connected terminal
09-05-2019
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