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JP2006279105

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2006279105
PROBLEM TO BE SOLVED: To facilitate adjustment of delay and signal level of sound output from
each speaker in a speaker array having a plurality of loudspeakers arranged in a plane, and
acoustic characteristics of an acoustic space in which the speaker array is disposed To facilitate
the above adjustment. SOLUTION: A sound source is placed at the position of a sound image to
be localized in a speaker array, and a sound is outputted from the sound source, and each
speaker constituting the speaker array is made to function as a microphone to receive its sound.
The corresponding electrical signal is output. Then, while analyzing the electric signal output
from each speaker and storing parameters representing the delay and signal level for each
speaker, when the sound image is localized, the delay of the electric signal supplied to each
speaker and The signal level is adjusted in accordance with the parameters stored in association
with the speaker. [Selected figure] Figure 1
Voice input / output device
[0001]
The present invention relates to a speaker array in which a plurality of speakers are arranged in
a plane, and more particularly to a technique for adjusting delay and signal level of sound output
from each speaker.
[0002]
A speaker array in which a plurality of speakers are arranged in a plane is installed in an acoustic
space such as a concert hall, a movie theater, or various event venues, and it is widely practiced
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1
to reproduce a realistic sound.
In order to reproduce realistic sound using such a speaker array, the output characteristics of
each speaker, such as the acoustic characteristics of the acoustic space in which the speaker
array is disposed, the vibration characteristics of the diaphragm provided in each speaker, etc.
Accordingly, it is necessary to adjust the signal level and delay of the sound output from each
speaker. However, in the case where the speaker array is configured of a large number of
speakers such as hundreds, for example, it is a great deal of work to grasp the output
characteristics of each speaker and to perform adjustment according to the output
characteristics. It will require labor.
[0003]
On the other hand, with regard to a single speaker, various techniques have been proposed which
make it easy to accurately grasp the output characteristic and perform various adjustments in
accordance with the output characteristic. The techniques disclosed in 1 can be mentioned. In
Patent Document 1, a microphone is disposed in the vicinity of a speaker, and a predetermined
sound is output from the speaker, and the sound is received by the microphone, and an electrical
signal output from the microphone (that is, output from the speaker Disclosed is a technique for
grasping the output characteristics of the speaker by analyzing the electrical signal
corresponding to the voice signal. Unexamined-Japanese-Patent No. 06-233393
[0004]
As described above, with regard to a single speaker, by using the technology disclosed in Patent
Document 1, it becomes easy to grasp the output characteristics thereof and to perform various
adjustments in accordance with the output characteristics. However, the technique disclosed in
Patent Document 1 can not be applied as it is to a speaker array including a plurality of speakers.
This is because, in the speaker array, a plurality of speakers are arranged in close proximity, and
it is impossible to individually receive the sound output from each speaker. Further, in the
technology disclosed in Patent Document 1, since the sound emitted from the speaker is received
by the microphone disposed in the vicinity of the speaker, the sound collected by the microphone
is It does not necessarily reflect the acoustic characteristics of the acoustic space where the
speaker is placed. That is, even if the technology disclosed in Patent Document 1 is used, there is
also a problem that the adjustment taking into account the acoustic characteristics can not be
performed.
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2
[0005]
The present invention has been made in view of the above problems, and for a speaker array
having a plurality of speakers arranged in a plane, the delay and signal level of the sound output
from each speaker are output characteristics of each speaker It is an object of the present
invention to provide a technology that makes it easy to adjust accordingly, and allows adjustment
to be performed taking into account the acoustic characteristics of the acoustic space in which
the speaker array is placed.
[0006]
In order to solve the above problems, the present invention comprises a diaphragm function, a
speaker function of vibrating the diaphragm according to an input electric signal and outputting
a sound according to the electric signal, and the input sound An audio input / output device array
formed by arranging a plurality of unit devices having a microphone function simultaneously
converting the vibration of the diaphragm into an electrical signal and outputting the same, delay
and signal level of an electrical signal input from the outside Signal processing means adjusted
for each unit device and output to each unit device, specifying means for analyzing an electric
signal output from the unit device and specifying a delay and signal level of the electric signal,
and the voice A switch for connecting the input / output device array to any one of the signal
processing means and the identification means; And the signal processing means are connected,
the electric signal whose delay and signal level have been adjusted by the signal processing
means is input to each of the unit devices, and sound corresponding to the electric signal is input.
When output is made to each unit device and the voice input / output device and the specifying
means are connected by the switch, the electric signal outputted from each of the unit devices is
inputted to the specifying means, and the delay thereof And an audio input / output device
characterized by causing the specifying means to specify a signal level for each unit device.
According to such a voice input / output device, the sound source is placed at the position of the
sound image to be localized by the voice input / output device, and the voice input / output
device array and the identification means are connected by the switch. When each unit device
receives the sound, the electric signal corresponding to the sound is output from each unit
device. Thus, the electrical signal output from each unit device is specified by the specifying
means, and its delay and signal level are specified for each unit device.
[0007]
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In another preferred embodiment, the signal processing apparatus comprises storage means, and
writing means for writing a parameter representing a delay or signal level specified for each unit
device by the specifying means to the storage means for each unit device. The processing means
is characterized in that the delay and the signal level of the electric signal inputted from the
outside are adjusted for each of the unit devices according to the parameters stored in the
storage means, and are outputted to each of the unit devices. In such an aspect, parameters
representing the delay and signal level identified by the identification means are written to the
storage means for each unit device, while delays and signal levels of electrical signals supplied to
the respective unit devices Are adjusted in accordance with the parameters stored in the storage
means in association with the unit device. In another preferred embodiment, the electric signal
output from the unit device is amplified and input to the specifying unit, and the electric signal
output from the signal processing unit is amplified and input to the unit device. An amplifier is
provided for each unit device.
[0008]
According to the present invention, for a speaker array having a plurality of speakers arranged in
a plane, it becomes easy to adjust the delay and signal level of the sound output from each
speaker according to the output characteristics of each speaker The effect of making it possible
to perform adjustment in consideration of the acoustic characteristics of the acoustic space in
which the speaker array is placed is produced.
[0009]
The best mode for carrying out the present invention will be described below with reference to
the drawings.
(A: Configuration) FIG. 1 is a block diagram showing a configuration example of a voice input /
output device 10 according to an embodiment of the present invention. The audio input / output
device 10 includes, for example, an audio input / output device array 110 functioning as a
speaker array placed in an acoustic space such as a concert hall, and the audio input / output
device array 110 is shown in FIG. Thus, m × n unit devices DU (i, j) (i = 1 to m, j = 1 to n) are
arranged in a plane. In the following, when it is not necessary to distinguish each of the plurality
of unit devices DU (i, j), it is referred to as “unit device DU”. Although this unit device DU is not
shown in detail, it has a diaphragm, and has a speaker function of vibrating the diaphragm
according to the input electric signal and outputting a sound corresponding to the electric signal.
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When the diaphragm vibrates in accordance with the sound emitted from the external sound
source, it has a microphone function of converting the vibration into an electric signal and
outputting it. Further, in the present embodiment, a case is described in which m × n unit
devices DU are arranged in a matrix to form a rectangular speaker surface, but for example, a
cylindrical speaker surface is formed. It goes without saying that the arrangement is not limited
to the arrangement shown in FIG. 2 as in the case where each unit device DU is arranged. In the
present embodiment, although the case where the voice input / output device array 110 is a
speaker array placed in a concert hall or the like will be described, it may be a speaker array
placed in a living room of a general house to form a home theater system. Of course.
[0010]
Although detailed illustration is omitted in FIG. 1, in the audio input / output device 10, the first
switch 120, the second switch 130, the amplifier 140, and the AD converter 150 are arranged to
correspond one by one to each of the unit units DU. Is provided. Further, as shown in FIG. 1, in
addition to the audio input / output device array 110, the first switch 120, the second switch
130, the amplifier 140 and the AD converter 150, the audio input / output device 10 controls
And a signal processing unit 180.
[0011]
The first switch 120 and the second switch 130 enable the unit device DU to function as a
speaker (ie, enable the speaker function) and enable the microphone function (ie, enable the
microphone function). And the connection of each component described above. Specifically,
when enabling the speaker function of the unit device DU, the connection is switched as shown
by a broken line in FIG. 1, and conversely, when enabling the microphone function of the unit
device DU, the diagram is shown. The connection is switched as shown by the solid line of 1.
Although detailed illustration is omitted in FIG. 1, the m × n first switches 120 and the second
switches 130 collectively perform the microphone function and the speaker function for the m ×
n unit devices DU. The connection switching can be performed in conjunction with one another
so that one of them can be validated. In the following, the operation mode in the case of enabling
the speaker function of each unit device DU will be referred to as "voice output mode", and the
operation mode in the case of enabling the microphone function will be referred to as
"characteristic specifying mode".
[0012]
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The amplifier 140 amplifies the electric signal delivered from the signal processing unit 180
through the second switch 130 when the operation mode is set to the voice output mode, and the
corresponding unit through the first switch 120. While delivering to the device DU, when the
operation mode is set to the characteristic specification mode, the electric signal delivered from
the corresponding unit device DU via the first switch 120 and the second switch 130 is amplified
and the corresponding signal is generated. It is delivered to the AD converter 150. In the present
embodiment, the amplifier 140 amplifies the electrical signal delivered from the signal
processing unit 180 to each unit device DU and the electrical signal delivered from each unit
device DU to the AD converter 150. However, it goes without saying that such amplification is
not absolutely necessary if each electrical signal has sufficient signal strength.
[0013]
The AD converter 150 performs analog-to-digital conversion on the electric signal delivered from
the amplifier 140, and delivers digital data corresponding to the conversion result to the control
unit 170. The storage unit 160 is configured of, for example, an EEPROM (Electronically Erasable
and Programmable Read Only Memory), a hard disk, or the like. The storage unit 160, for each
unit device DU, represents parameters representing the delay and signal level of the electrical
signal to be supplied to each unit device DU when the sound input / output device 10 causes the
predetermined sound image to be localized at a predetermined position. It is for storing.
[0014]
The control unit 170 is, for example, a CPU (Central Processing Unit), and implements functions
specific to the voice input / output device 10 according to the present invention according to
software written in a ROM (Read Only Memory) or the like (not shown). It is for.
[0015]
More specifically, when the operation mode is set to the characteristic specifying mode, the
control unit 170 analyzes the digital data delivered from the AD converter 150 and outputs an
electrical signal corresponding to the digital data. A process of specifying a delay and a signal
level and writing a parameter representing the specified result (that is, a parameter representing
the delay and the signal level) for each unit device DU that is the output source of the electrical
signal into the storage unit 160 .
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That is, when operating in the characteristic specifying mode, the control unit 170 functions as
specifying means for specifying the delay and signal level of the electric signal supplied to each
unit device DU. Conversely, when the operation mode is set to the voice output mode, control
unit 170 reads the parameter written in storage unit 160 for each unit device DU, and sets the
parameter in signal processing unit 180. Perform parameter setting processing.
[0016]
The signal processing unit 180 in FIG. 1 is, for example, a DSP (Digital Signal Processor), and is
used as an audio signal input from the outside (that is, an electrical signal representing sound
reproduced by the sound input / output device 10 in the sound space). Signal processing specific
to each unit device DU (that is, adjustment of delay and signal level according to each of the
above parameters) is performed, and output to the amplifier 140 corresponding to each unit
device DU.
[0017]
(B: Operation) Next, among the operations performed by the voice input / output device 10
according to the present embodiment, an operation showing the characteristic of the
characteristic will be described with reference to the drawings.
(B-1: Operation Example of Characteristic Specifying Mode) First, an operation performed by the
voice input / output device 10 when the operation mode is set to the characteristic specifying
mode will be described. In the operation example described below, the sound source is placed at
a position where the sound image is localized by the sound input / output device 10 in a
predetermined sound space, and a predetermined sound (for example, pink noise or white noise)
is output. Shall be Specifically, in the acoustic space 300 as shown in FIG. 3, the sound source
310 is placed at a distance L from the speaker surface of the voice input / output device array
110, and a predetermined sound is output from the sound source 310. It shall be.
[0018]
FIG. 4 is a flowchart showing the flow of the operation performed by the voice input / output
device 10 when the operation mode is set to the characteristic specification mode. As shown in
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FIG. 4, each unit device DU that has received the sound output from the sound source 310
outputs an electrical signal corresponding to the sound (step SA1). The electric signal output
from each unit device DU in this manner is amplified by the amplifier 140 and then converted to
digital data by the AD converter 150, and the digital data is input to the control unit 170 (step
SA2).
[0019]
The control unit 170 analyzes each of the digital data, and specifies the delay and signal level of
the electrical signal corresponding to the digital data (step SA3). Then, the control unit 170
writes the parameter representing the delay and the signal level specified in step SA3 to the
storage unit 160 for each unit device DU (step SA4), and completes the operation in the
characteristic specifying mode.
[0020]
The point to be noted here is that the parameter written to the storage unit 160 for each unit
device DU was vibrated according to the sound that has been transmitted from the sound source
310 and propagated through the acoustic space 300 for the diaphragm of the unit device DU. At
the same time, it represents the delay and signal level of the electric signal output from the unit
device DU, and the sound source 310 is a point at which the sound input / output device 10
locates the sound image. That is, when the sound input / output device 10 is operated in the
sound output mode and the sound image is localized at the position of the sound source 310, the
delay and signal level of the electric signal supplied to each unit device DU are adjusted
according to the parameters. You should do it. Then, since the sound received by each unit device
DU is the sound emitted from the sound source 310 and propagated through the acoustic space
300 (ie, the sound reflecting the acoustic characteristics of the acoustic space 300), as described
above It goes without saying that the acoustic characteristics of the acoustic space 300 are added
to the specified parameters. As described above, according to the voice input / output device 10
according to the present embodiment, when a desired sound image is localized at a desired
position in a certain acoustic space, parameters to be set for each unit device DU can be easily
specified and stored. The effect of being able to
[0021]
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(B-2: Operation Example of Voice Output Mode) Next, an operation performed by the voice input
/ output device 10 when the operation mode is set to the voice output mode will be described. In
the operation example described below, parameters for localizing the sound image at the position
where the sound source 310 is placed in the sound space 300 shown in FIG. 3 (that is, specified
in the operation of the characteristic specifying mode) Parameters) are stored in the storage unit
160 for each unit device.
[0022]
FIG. 5 is a flowchart showing the flow of the operation performed by the voice input / output
device 10 when the operation mode is set to the voice output mode. As shown in FIG. 5, the
control unit 170 first reads the parameters stored in the storage unit 160 for each unit device
DU from the storage unit 160, and sets the parameters in the signal processing unit 180 (step
SB1). When the parameters are set as described above, the signal processing unit 180 performs
signal processing according to each parameter on the input audio signal and outputs the signal
(step SB2). The electric signal output from the signal processing unit 180 is amplified by each
amplifier 140 and then input to each unit device DU, and a sound corresponding to the electric
signal is output from each unit device DU (step SB3). As a result, in the acoustic space 300 shown
in FIG. 3, the sound image is localized at a predetermined position separated from the voice input
/ output device array 110 by the distance L.
[0023]
As described above, according to the audio input / output device 10 according to the present
embodiment, it is easy to adjust the delay and signal level of the audio output from each unit
device DU according to the output characteristics of each unit device Thus, the above adjustment
can be performed in consideration of the acoustic characteristics of the acoustic space in which
the voice input / output device 10 is placed.
[0024]
(C: Modification) Although one embodiment of the present invention has been described above, it
is needless to say that the following modification may be added to the above-described
embodiment.
(1) In the embodiment described above, in the case where the sound image is localized at the
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position separated by the distance L from the speaker surface of the audio input / output device
array 110, the case of specifying the parameters to be set for each unit device has been
described. However, for example, the parameters may be specified for a plurality of positions in
the acoustic space 300, and the parameters may be stored for each position in the storage unit
160 for each unit device DU. In this way, the audio signal and data representing the position
where the sound image should be localized (hereinafter referred to as position data) is input to
the audio input / output device 10, and the control unit 170 stores the parameter corresponding
to the position data. By reading out from 160 and setting in the signal processing unit 180, it is
possible to easily reproduce a sound image moving in the acoustic space 300.
[0025]
(2) In the embodiment described above, the case where the parameter specified by the control
unit 170 is written in the storage unit 160 for each unit device DU has been described, but for
example, these may be transmitted via a communication network such as LAN (Local Area
Network) Of course, the parameters may be transmitted to a predetermined destination (for
example, a computer device used by the sound engineer to control the sound effect).
[0026]
(3) In the above-described embodiment, parameters for locating the sound image at a desired
position in the acoustic space are specified and stored, and the delay and signal level of the
electrical signal supplied to each unit device are adjusted according to the parameters The case
was described.
However, in order to enable the sound image to be perceived only at a specific sound receiving
point in the sound space, the sound is supplied to each unit device so that the sound beam is
formed by the sound output from each unit device DU. Of course, the delay and signal level of the
electrical signal to be adjusted may be adjusted. Specifically, in addition to the adjustment for the
localization of the sound image, the signal processing unit 180 performs the adjustment for
forming the acoustic beam, and then supplies an electric signal to each unit device DU. Of course,
it is also good to do.
[0027]
(4) In the embodiment described above, by operating the hardware modules which are the
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components of the voice input / output device 10 in cooperation in accordance with the
flowcharts shown in FIG. 4 and FIG. Explained the case of realizing various functions. However, it
goes without saying that the above-described components may be realized by software modules.
[0028]
It is a block diagram showing composition of speech input-output device 10 concerning the
present invention. It is a figure which shows the relationship between the audio | voice input /
output device array 110, and unit device DU. It is a figure for demonstrating the usage example
of the audio | voice input / output device 10. FIG. It is a flowchart which shows the flow of the
operation | movement which the said voice input / output device 10 performs in characteristic
specific mode. It is a flowchart which shows the flow of the operation | movement which the said
audio | voice input / output device 10 performs in an audio | voice output mode.
Explanation of sign
[0029]
DESCRIPTION OF SYMBOLS 10 ... Audio | voice input / output device, 110 ... Sound | voice input
/ output device array, DU ... Unit device, 120 ... 1st switch, 130 ... 2nd switch, 140 ... Amplifier,
150 ... AD converter, 160 ... Storage part, 170 ... Control Unit, 180: Signal processing unit.
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