JP2008228133

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DESCRIPTION JP2008228133
To provide an acoustic system capable of easily correcting the amount of acoustic adjustment
with high accuracy. A mixer / processor 6 is an acoustic adjustment device and is connected to
an acoustic correction device 8. The sound correction device 8 stores device characteristic values
that each of the plurality of audio devices of the audio system 1 has, together with a model ID
that identifies the model of each audio device. The model IDs of the plurality of audio devices are
received by the audio correction device 8. Correction based on the collected sound signal
obtained when the measurement audio signal is output and the device characteristic value stored
in association with the received model ID, correction of the acoustic characteristic in the sound
field to the required acoustic characteristic Is applied to the sound adjustment amount of the
mixer / processor 6. [Selected figure] Figure 1
Sound system
[0001]
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an
acoustic system having a function of automatically correcting an acoustic adjustment amount in
acoustic adjustment means such as a mixer.
[0002]
Conventionally, in an audio system of various facilities such as a commercial facility, a plurality
of audio devices such as a speaker, an amplifier, and a microphone are connected to a mixer /
processor which is an audio adjustment device.
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The mixer / processor is an instrument for adjusting acoustic characteristics, and typical acoustic
characteristics include acoustic frequency characteristics and loudness. The acoustic frequency
characteristics are adjusted by appropriately setting the filter coefficients in the equalizer
function of the mixer / processor.
[0003]
When installing or maintaining an acoustic system, it is necessary to correct the amount of
acoustic adjustment in the mixer / processor so as to obtain desired acoustic characteristics. The
correction of the adjustment amount of the acoustic frequency characteristic among the acoustic
characteristics is called sound field correction. The following automatic correction techniques
have been proposed for sound field correction. In this prior art, the audio signal for measurement
is output from the speaker to the sound field, and the sound of the sound field is collected using
the microphone. Then, the acoustic frequency characteristic of the collected signal is compared
with a preset required frequency characteristic, and the filter coefficient of the mixer / processor
is corrected so that the acoustic frequency characteristic of the collected signal approaches the
required frequency characteristic. Thus, conventionally, the acoustic frequency characteristic is
measured using a microphone, and the measured value is compared with the required
characteristic to correct the acoustic adjustment amount of the mixer / processor (see Patent
Document 1). JP 2005-49688 A
[0004]
However, in the conventional acoustic system, the sound field correction is automatically
performed by comparing the measured value of the acoustic frequency characteristic and the
required value, but the characteristic of the acoustic device such as the microphone involved in
the measurement of the acoustic frequency characteristic is taken into consideration There is a
problem that the correction accuracy is reduced because the correction is not performed.
[0005]
To explain the above problem in more detail, each of the audio devices constituting the audio
system has in-device frequency characteristics that affect the audio frequency characteristics of
the audio signal to be processed, and each of the audios according to the device characteristics.
The output signal of the device changes.
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If the device characteristics are not taken into consideration, the acoustic frequency
characteristic of the actual sound field and the measurement result of the acoustic frequency
characteristic obtained from the collected sound signal deviate. Even if correction is performed
using such a misaligned measurement result, the acoustic frequency characteristic of the actual
sound field does not match the required frequency characteristic, and high correction accuracy
can not be obtained.
[0006]
Also, with regard to the volume of the acoustic characteristics, no automatic correction
technology has hitherto been proposed for the acoustic system as a whole. And volume
correction is performed only by the manual work of the operator, and there existed a problem
that it took time and effort. In addition, some facilities are required to correct the volume even if
there are no workers, and automation of volume correction is desired to meet such a demand.
Also, high accuracy is required for volume correction.
[0007]
The present invention has been made to solve the conventional problems, and its object is to
provide an acoustic system capable of easily correcting the amount of acoustic adjustment with
high accuracy.
[0008]
The audio system of the present invention is connected to a plurality of audio devices for sound
output to a sound field and sound collection from the sound field, and the plurality of audio
devices for the audio device for audio output. Sound adjustment means for supplying a sound
signal and inputting a sound collection signal from the sound device for sound collection, and
correcting a sound adjustment amount in the sound adjustment means so as to obtain a preset
required sound characteristic A device characteristic storage unit that includes an acoustic
correction unit, and the acoustic correction unit stores device characteristic values of each of the
plurality of acoustic devices together with a model ID identifying a model of each of the plurality
of acoustic devices; And ID receiving means for receiving the device type ID of the device, the
sound collection signal obtained when outputting the audio signal for measurement, and the
device ID received by the ID receiving means in association with the device ID Stored in said
vessel characteristic storage means on the basis of the device characteristic value, a correction to
bring the acoustic characteristics in the sound field to the request acoustic characteristics is
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configured to perform to the sound adjustment amount.
[0009]
With this configuration, model IDs of a plurality of audio devices constituting the audio system
are collected, and device characteristic values respectively corresponding to the plurality of
model IDs are read out from the device characteristic storage means.
The acoustic adjustment amount is corrected so that the actual acoustic characteristic in the
sound field approaches the required acoustic characteristic by using not only the collected sound
signal which is the measurement data but also the device characteristic value, whereby the
acoustic adjustment amount is obtained. Can be corrected with high accuracy.
In addition, since the device characteristic value corresponding to the received model ID is read
out from the device characteristic storage means, the work of the operator manually inputting
the device characteristic value can be reduced, and hence the sound adjustment amount can be
easily corrected.
[0010]
Further, in the sound system of the present invention, when the sound device is replaced, the ID
receiving means receives a model ID of the sound device after replacement, and the sound
correction means stores the information in the device characteristic storage means. The acoustic
adjustment amount is corrected based on the device characteristic value of the acoustic device
before replacement and the device characteristic value of the acoustic device after replacement.
[0011]
According to this configuration, when the audio device is replaced, the model ID of the replaced
audio device is received.
Then, the acoustic adjustment amount is corrected based on the device characteristic value of the
audio device before replacement and the device characteristic value of the audio device after
replacement. As a result, it is not necessary to re-measure the acoustic characteristics when the
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acoustic device is replaced, and the amount of acoustic adjustment can be corrected quickly and
easily in accordance with the replaced acoustic device.
[0012]
Further, in the sound system of the present invention, the sound correction means corrects a
parameter for controlling sound frequency characteristics as the sound adjustment amount.
According to this configuration, the acoustic frequency characteristic can be automatically
adjusted, and the sound field correction can be automatically performed.
[0013]
Further, in the sound system of the present invention, the sound correction means corrects a
volume as the sound adjustment amount. With this configuration, volume correction can be
performed automatically.
[0014]
Further, according to the sound correction device of the present invention, the sound device for
sound output is connected to a plurality of sound devices for sound output to a sound field and
sound collection from the sound field, and the plurality of sound devices. To provide an audio
signal to the audio system, and to obtain an acoustic system having sound adjustment means for
inputting a sound collection signal from the sound device for sound collection so as to obtain a
preset required sound characteristic. An acoustic correction device that corrects an acoustic
adjustment amount in the acoustic adjustment means, wherein the device characteristic storage
means stores an instrument characteristic value of each of the plurality of acoustic devices
together with a model ID identifying a model of each acoustic device. And ID receiving means for
receiving the model ID of the plurality of audio devices, wherein the sound collection signal
obtained when the audio signal for measurement is output, and the model I received by the ID
receiving means The acoustic adjustment amount is corrected to bring the acoustic characteristic
in the sound field closer to the required acoustic characteristic based on the device characteristic
value stored in the device characteristic storage means in association with ing. This configuration
also provides the advantages of the present invention described above.
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[0015]
Further, according to the sound correction method of the present invention, a plurality of sound
devices for sound output to a sound field and sound collection from the sound field, and the
sound devices for sound output connected with the plurality of sound devices To provide an
audio signal to the audio system, and to obtain an acoustic system having sound adjustment
means for inputting a sound collection signal from the sound device for sound collection so as to
obtain a preset required sound characteristic. A sound correction method for correcting an
amount of sound adjustment in the sound adjusting unit, comprising: acquiring, from the
plurality of sound devices, a model ID for identifying a model of each sound device; and device
characteristics of each of the plurality of sound devices The device characteristic value stored in
association with the received model ID is acquired from the device characteristic storage unit
that stores a value, and the sound collection signal obtained when an audio signal for
measurement is output, and the device Characteristic memory hand Based on the obtained said
device characteristic values from, subjected to correction to approach the acoustic characteristics
in the sound field in the request acoustic properties to the sound adjustment amount. This
method also provides the advantages of the invention described above.
[0016]
The present invention, as described above, is provided with a configuration for applying
correction to bring the acoustic characteristic in the sound field closer to the required acoustic
characteristic to the acoustic adjustment amount using the device characteristic value stored in
association with the model ID of the acoustic device. Thus, it is possible to provide an acoustic
system having an effect that the acoustic adjustment amount can be easily corrected with high
accuracy.
[0017]
Hereinafter, an acoustic system according to an embodiment of the present invention will be
described using the drawings.
[0018]
First Embodiment An acoustic system according to an embodiment of the present invention is
shown in FIG.
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As shown in FIG. 1, in the sound system 1, the speaker 2 is disposed in the sound field 100, and
the speaker 2 is connected to the mixer / processor 6 via the power amplifier 3.
The sound field 100 is a space in which sound is output by the sound system 1. In addition, a
wireless microphone transmitter 4 is disposed in the sound field. Then, a wireless microphone
receiver 5 in wireless communication with the wireless microphone transmitter 4 is connected to
the mixer / processor 6. Furthermore, the mixer / processor 6 is connected to the acoustic
correction device 8.
[0019]
In the above configuration, the speaker 2 and the amplifier 5 are configured to receive an
electrical audio signal from the mixer / processor 6, convert the audio signal to audio, and output
it to the sound field 100, and an audio device for audio output It corresponds to
[0020]
Also, the wireless microphone transmitter 4 and the wireless microphone receiver 5 are
configured to convert the sound of the sound field into an electrical sound signal and to input it
to the mixer / processor 6.
At the time of measurement for sound correction, the wireless microphone transmitter 4 and the
wireless microphone receiver 5 function as an acoustic device for sound collection, and pick up
the sound of the sound field to make a mixer / Input to processor 6
[0021]
The mixer / processor 6 is an acoustic adjustment device, and the acoustic correction device 8 is
configured to correct the acoustic adjustment amount in the mixer / processor 6 so as to obtain a
preset required acoustic characteristic. In the present embodiment, sound field correction is
performed. That is, the acoustic characteristic is the acoustic frequency characteristic, and the
correction is performed such that the acoustic frequency characteristic approaches the required
frequency characteristic. Specifically, in the sound field correction, the filter coefficient of the
equalizer is corrected as a parameter for controlling the acoustic frequency characteristic.
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[0022]
The sound correction device 8 may be a personal computer. The personal computer functions as
the sound correction device 8 by executing the program for realizing the correction function of
the present embodiment.
[0023]
Sound field correction by the sound correction device 8 is performed as adjustment before
operation when the sound system 1 is installed or the like. Generally, as shown in FIG. 1, the
model ID of each of the audio equipment groups connected to the mixer / processor 6 is
collected in the acoustic correction device 8. Here, the communication function of control signals
between devices is used. The model ID is identification information that identifies the model of
each audio device, and is assigned to each audio device in advance. The sound correction device
8 stores the device characteristic value of each audio device in association with the device type
ID, and reads the device characteristic value corresponding to the received device type ID. The
device characteristic value is a characteristic possessed by each acoustic device, and is a
characteristic in the device that affects the acoustic characteristic to be corrected, and examples
thereof include the device internal frequency characteristic, gain, and the like. In the case of the
present embodiment, the device characteristic value is the device internal frequency
characteristic, and this device frequency characteristic value affects the acoustic frequency
characteristic of the output signal of each device as a characteristic related to the sound field
correction in more detail. Is used as a device characteristic value.
[0024]
On the other hand, a test signal, which is an audio signal for measurement, is output from the
speaker 2, collected by the wireless microphone transmitter 4, and a collected signal is received
by the acoustic correction device 8 as measurement data. The test signal is a pink noise, a chirp
signal, a musical tone or the like. Then, the sound correction device 8 corrects the adjustment
amount of the sound frequency characteristic of the mixer / processor 6 using the collected
sound signal and the above-mentioned device characteristic value. Here, the collected sound
signal is analyzed to obtain a measured value of the acoustic frequency characteristic. Then, by
considering the device characteristic value, correction is performed so that the actual acoustic
frequency characteristic of the sound field, not the measured value itself, approaches the
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required frequency characteristic.
[0025]
Such measurement and correction are repeated, and the correction ends when the acoustic
frequency characteristic of the sound field including the device characteristic value falls within
the target range of the required frequency characteristic. Then, the sound system 1 is actually
operated.
[0026]
Next, each apparatus which comprises the sound system 1 is demonstrated. FIG. 2 shows the
internal configuration of the speaker 2, the power amplifier 3, the wireless microphone
transmitter 4 and the wireless microphone receiver 5.
[0027]
The speaker 2 has an ID recording unit 21 for storing a model ID, an ID transmission unit 22 for
transmitting the model ID stored in the ID recording unit 21 to the power amplifier 3, and an
audio signal reception for receiving an audio signal from the power amplifier 3 And a unit 23.
The received electrical voice signal is converted to voice and output to the sound field 100.
[0028]
The power amplifier 3 includes an ID recording unit 31 for storing a model ID, an ID receiving
unit 32 for receiving a model ID of the speaker 2 from the ID transmitting unit 23, and an ID
transmitting unit 33 for transmitting a model ID to the mixer / processor 6. Is equipped. The ID
transmission unit 33 transmits the model ID of the speaker 2 received from the speaker 2 and
the model ID of the power amplifier 3 read from the ID recording unit 31. The power amplifier 3
further includes an audio signal receiving unit 34 for receiving an audio signal from the mixer /
processor 6 and an audio signal transmitting unit 35 for transmitting the audio signal to the
speaker 2. The audio signal is amplified by the power amplifier 3 and then transmitted to the
speaker 2.
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[0029]
The wireless microphone transmitter 4 includes an ID recording unit 41 for storing a model ID,
an ID transmission unit 42 for transmitting the model ID stored in the ID recording unit 41 to the
wireless microphone receiver 5, and voices to the wireless microphone receiver 5. And an audio
signal transmission unit 43 for transmitting a signal. The sound of the sound field is converted
into an electric sound signal by the microphone function of the wireless microphone transmitter
4 and is transmitted from the sound signal transmitter 43 to the wireless microphone receiver 5.
[0030]
The wireless microphone receiver 5 transmits the model ID to the mixer / processor 6, the ID
recording unit 51 storing the model ID, the ID receiving unit 52 receiving the model ID of the
wireless microphone transmitter 4 from the ID transmission unit 43, and And an ID transmission
unit 53. The ID transmission unit 53 transmits the model ID of the wireless microphone
transmitter 4 received from the wireless microphone transmitter 4 and the model ID of the
wireless microphone receiver 5 read from the ID recording unit 51. The wireless microphone
receiver 5 further includes an audio signal receiving unit 54 for receiving an audio signal from
the wireless microphone transmitter 4 and an audio signal transmitting unit 55 for transmitting
an audio signal to the mixer / processor 6.
[0031]
FIG. 3 shows the internal configuration of the mixer / processor 6 and the acoustic correction
device 8. The mixer / processor 6 includes an audio signal reception unit 601 that receives an
audio signal from the wireless microphone receiver 5 and an audio signal transmission unit 602
that transmits an audio signal to the power amplifier 3 as a configuration related to processing of
the audio signal. A filter unit 603 disposed between the audio signal receiving unit 601 and the
audio signal transmitting unit 602 is provided. The filter unit 603 is configured to realize an
equalizer function. An audio signal from a sound source (not shown) is input to the filter unit 603
through the audio signal receiving unit 601, subjected to acoustic adjustment by the filter unit
603, and then output through the audio signal transmitting unit 602.
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[0032]
The mixer / processor 6 further transmits an audio signal received by the audio signal receiving
unit 601 to the acoustic correction device 8, receives an audio signal from the acoustic
correction device 8, and transmits the audio signal to the filter unit 603. And an audio signal
reception unit 605 for supplying the signal. The audio signal receiving unit 605 receives a test
signal for measurement from the sound correction device 8.
[0033]
The mixer / processor 6 further includes a filter coefficient receiver 606. The filter coefficient
reception unit 606 receives the correction filter coefficient from the sound correction device 8
and supplies the correction filter coefficient to the filter unit 603. The filter coefficient is changed
in the filter unit 603 according to the correction filter coefficient.
[0034]
In addition, as the configuration related to the processing of the model ID, the mixer / processor
6 includes an ID receiving unit 611 that receives the model ID of the speaker 2 and the power
amplifier 3 from the power amplifier 3, the wireless microphone transmitter 4 and the wireless
microphone receiver An ID reception unit 612 that receives the model ID of 5 from the wireless
microphone receiver 5 and an ID transmission unit 613 that transmits the model ID to the sound
correction apparatus 8 are provided. The ID transmission unit 613 transmits the model IDs of the
speaker 2, the power amplifier 3, the wireless microphone transmitter 4 and the wireless
microphone receiver 5 received by the ID reception units 611 and 612 to the sound correction
device 8. A model ID recording unit that stores the model ID of the mixer / processor 6 may be
provided in the mixer / processor 6, and the model ID of the mixer / processor 6 may also be
sent from the ID transmission unit 613 to the acoustic correction device 8.
[0035]
Next, the configuration of the sound correction device 8 will be described. The acoustic
correction device 8 includes a test signal recording unit 801, a test signal transmission unit 802,
and a test signal operation unit 803 in order to output a test signal for measurement of acoustic
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frequency characteristics. The test signal recording unit 801 stores a test signal. As described
above, the test signal is, for example, a pink noise, a chirp signal, a musical tone (music) or the
like. The test signal operation unit 803 is configured to input a selection of a test signal to be
output and an output instruction of the test signal, and is realized by an input device of a
computer. The test signal is read from the test signal storage unit 801 according to the operation
to the test signal operation unit 803, and is transmitted to the mixer / processor 6 by the test
signal transmission unit 802.
[0036]
Further, the sound correction device 8 includes an audio signal reception unit 811 and a
frequency characteristic calculation unit 812 as a configuration for obtaining a measurement
value of the sound frequency characteristic. The audio signal reception unit 811 receives the
collected sound signal when the test signal is output from the mixer / processor 6 and supplies it
to the frequency calculation unit 812. The frequency characteristic calculation unit 812 is
configured to perform FFT (Fast Fourier Transform), analyzes the collected sound signal, and
calculates an acoustic frequency characteristic. The measurement data of the acoustic frequency
characteristic thus obtained is supplied to the filter coefficient calculation unit 841.
[0037]
Further, in the sound correction device 8, the required characteristic input unit 821 is a
configuration for inputting a required frequency characteristic, and is realized by an input device
of a computer. The required frequency characteristic is an ideal characteristic. The input required
frequency characteristic is supplied to the filter coefficient calculation unit 841 and set as a
correction target. In this way, the required frequency characteristics can be set in advance.
[0038]
The required frequency characteristics may be stored in the sound correction device 8. A
plurality of required frequency characteristics may be stored in the acoustic correction unit 8 in
the form of a database. Then, using the required characteristic input unit 821, an appropriate
required frequency characteristic may be selected and supplied to the filter coefficient
calculation unit 841.
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[0039]
The sound correction device 8 further includes an ID receiving unit 831 and a device
characteristic database 832. The ID receiving unit 831 and the device characteristic database
832 correspond to the ID receiving unit and the device characteristic storage unit of the present
invention, respectively. The ID reception unit 831 receives the model ID of each connected device
from the mixer / processor 6 and supplies the device characteristic database 832 with the device
ID. The device characteristic database 832 stores device characteristic values of various acoustic
devices. The device characteristic database 832 reads out the device characteristic value
corresponding to each received model ID and supplies the read value to the filter coefficient
calculation unit 841.
[0040]
The filter coefficient calculation unit 841 is the measurement data of the acoustic frequency
characteristic supplied from the frequency characteristic calculation unit 812, the required
frequency characteristic supplied from the required characteristic input unit 821, and each
acoustic device read from the device characteristic database 832. The correction filter coefficient
is calculated based on the model characteristic value of. The correction filter coefficient is
transmitted to the filter coefficient reception unit 606 of the mixer / processor 6 via the filter
coefficient transmission unit 842.
[0041]
Next, with reference to FIG. 4 and FIG. 5, the correction processing using the device characteristic
value in the present embodiment will be described. FIG. 4 shows an example of model
characteristic values stored in the device characteristic database 832. As described above, the
device characteristic database 832 stores device characteristic values in association with a model
ID for each model. In the example of the figure, the device characteristic value is a relative level
to the reference value for each frequency. When an audio signal passes through each acoustic
device, the acoustic frequency characteristic changes due to the influence of the device
characteristic value.
[0042]
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FIG. 5 shows the correction calculation process using the device characteristic value. In FIG. 5,
the speaker characteristic Z, the power amplifier characteristic A, the wireless transmission unit
characteristic X and the wireless reception unit characteristic Y are device characteristic values
of the speaker 2, the power amplifier 3, the wireless microphone transmitter 4 and the wireless
microphone receiver 5, respectively. And is obtained from the device characteristic database 832.
Here, each characteristic represented by alphabet letters is a vector (the same applies
hereinafter).
[0043]
The measurement test signal characteristic S is a characteristic of the measurement test signal
output from the mixer / processor 6. The test signal characteristic S for measurement may be
obtained by processing the test signal recorded in the test signal recording unit 801 at the time
of correction processing. The test signal characteristic S for measurement is previously calculated
from the test signal, stored in the acoustic correction device 8, and may be read out at the time of
correction. Further, as described above, the required frequency characteristic R is a characteristic
of a correction target that is input from the required characteristic input unit 821 and is preset
by the sound correction device 8. The indoor transfer characteristic H is a characteristic of sound
transmission in the sound field 100.
[0044]
Now, assuming that the correction characteristic for setting the acoustic frequency characteristic
in the sound field 100 to the required frequency characteristic R is N, the correction
characteristic N can be obtained by the calculation described below.
[0045]
In FIG. 5, the audio signal output from the mixer / processor 6 passes through the power
amplifier 3, the speaker 2, the sound field 100, the wireless microphone transmitter 4, and the
wireless microphone receiver 5, and returns to the mixer / processor 6.
If the acoustic frequency characteristic at the position of the wireless microphone transmitter 4
becomes the required frequency characteristic R by applying the correction characteristic N, the
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acoustic frequency characteristic of the sound field 100 becomes the required frequency
characteristic R. This is represented by equation (1), and equation (1) gives equation (2).
RS=HZANS ・・・(1) N=R/(HZA) ・・・(2)
[0046]
On the other hand, the acoustic frequency characteristic of the collected sound signal received by
the mixer / processor 6 at the time of measurement is taken as the collected sound data
characteristic T as illustrated. The collected sound data characteristic T is a measurement value
obtained by analyzing the collected sound signal when the test signal is output. This sound
collection data characteristic T is expressed by equation (3), and equation (3) is transformed into
equation (4). T=YXHZAS ・・・(3) HZA=T/(YXS) ・・・(4)
[0047]
Then, equation (5) is obtained from equation (2) and equation (4) as a calculation equation of
correction characteristic N. N=(YXRS)/T ・・・(5)
[0048]
In the sound correction device 8, the correction characteristic N is calculated by the filter
coefficient calculation unit 841 according to the above calculation formula, and the correction
filter coefficient corresponding to the correction characteristic N is obtained.
[0049]
As shown in FIG. 4, the device characteristic value is set for each frequency.
Therefore, the calculation of the correction characteristic and the correction filter coefficient
described above is also performed for each frequency.
[0050]
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The principle of the sound field correction in the present embodiment has been described above.
Next, the operation of the sound system 1 of the present embodiment will be described. Here, the
operation of sound field correction will be described. The sound field correction is preferably
performed before the actual operation of the sound system 1 as described above. Then, the
operation of the acoustic system 1 is started after the sound field correction.
[0051]
FIG. 6 is a flowchart showing the operation of the acoustic system 1. As illustrated, first, the
sound correction device 8 collects information on the model ID of the sound device constituting
the sound system 1 and the connection relationship (S1).
[0052]
Here, the model ID of the speaker 2 is sent to the power amplifier 3, and the model ID of the
power amplifier 3 is sent to the mixer / processor 6 together with the model ID of the speaker 2.
Further, the model ID of the wireless microphone transmitter 4 is sent to the wireless
microphone receiver 5, and the model ID of the wireless microphone receiver 5 is sent to the
mixer / processor 6 together with the model ID of the wireless microphone transmitter 4. Then,
the mixer / processor 6 transmits model IDs of the speaker 2, the power amplifier 3, the wireless
microphone transmitter 4 and the wireless microphone receiver 5, and these model IDs are
received by the ID receiving unit 831 of the sound correction device 8. The communication
function of the control signal is used for the communication of the model ID.
[0053]
In the process of collecting model IDs, information on connection relationships between devices
is also collected. In the above example, the mixer / processor 6 receives the model ID of the
speaker 2 and the power amplifier 3 from the power amplifier 3. Thereby, it is specified that the
power amplifier 3 and the speaker 2 are connected. Also, the mixer / processor 6 receives the
model IDs of the wireless microphone transmitter 4 and the wireless microphone receiver 5 from
the wireless microphone receiver 5. Thereby, it can be understood that the wireless microphone
transmitter 4 and the wireless microphone receiver 5 are connected.
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[0054]
This connection relationship is useful in the following points. In the example of FIG. 1, one
speaker and one microphone are shown to simplify the explanation. However, in practice, the
mixer / processor 6 may have more channels and more speakers or microphones may be
connected. In this case, sound adjustment is performed for each channel. Then, the abovementioned connection relationship information is used to specify the connected device of each
channel.
[0055]
Next, the sound correction device 8 reads the device characteristic value corresponding to all the
collected model IDs from the device characteristic database 832 (S3). The device characteristic
value is supplied to the filter coefficient calculation unit 841. When the speaker or the
microphone does not have the function of recording and transmitting the model ID, the device
characteristic value may be manually input and set using the input function of the sound
correction device 8.
[0056]
Next, the sound correction device 8 receives an input of the required frequency characteristic
(S5). The required frequency characteristics are input from the required characteristic input unit
821 and supplied to the filter coefficient calculation unit 841. As described above, the required
frequency characteristics are stored in a database and may be selected in accordance with the
user operation.
[0057]
Next, the sound correction device 8 performs processing of obtaining a measurement value by
reproducing and collecting the test signal. First, the sound correction device 8 controls the sound
system 1 to reproduce the test signal from the speaker 2 to the sound field 100 (S7). Here, the
test signal is read from the test signal recording unit 801 according to the instruction input from
the test signal operation unit 803. Then, the test signal is sent from the test signal transmission
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unit 802 to the mixer / processor 6. In the mixer / processor 6, the test signal is received by the
audio signal receiving unit 605 and sent to the filter unit 603. Then, the test signal is subjected
to acoustic adjustment in the filter unit 603 in accordance with the filter coefficient already set.
The adjusted test signal is sent from the mixer / processor 6 to the speaker 2 via the power
amplifier 3. The test signal is converted into sound by the speaker 2 and output to the sound
field 100. The voice of the test signal is picked up by the wireless microphone transmitter 4, and
the picked up signal is sent to the mixer / processor 6 through the wireless microphone receiver
5 and is sent from the mixer / processor 6 to the acoustic correction device 8. The sound
collection signal is received by the audio signal receiving unit 811 of the sound correction device
8 and recorded in the sound correction device 8 (S9). Then, the frequency characteristic
calculation unit 812 calculates the acoustic frequency characteristic of the collected signal (S11).
The measurement data of the acoustic frequency characteristic thus obtained is supplied to the
filter coefficient calculator 841.
[0058]
Next, the filter coefficient calculation unit 841 calculates a correction filter coefficient using the
measurement data of the acoustic frequency characteristic obtained as described above, the
device characteristic value, and the required frequency characteristic (S13). Then, the correction
filter coefficient is sent from the filter coefficient transmission unit 842 to the filter coefficient
reception unit 606 of the mixer / processor 6 and supplied to the filter unit 603 (S15). The filter
unit 603 performs setting processing for applying a correction filter coefficient, and performs
sound adjustment in accordance with the correction filter coefficient.
[0059]
The processes of steps S7 to S15 are repeatedly performed. Then, when the acoustic frequency
characteristic of the sound field including the device characteristic approaches the required
frequency characteristic sufficiently and the difference between the two characteristics falls
within the target range, this target achievement is judged in step S13, and the correction
processing is completed.
[0060]
The sound field correction before the start of operation has been described above. Next, sound
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field correction when an acoustic device is replaced after the start of operation will be described.
In the present embodiment, since the model ID and the connection state are automatically
recognized by the sound correction device 8 as described above, the device correction is also
automatically recognized by the sound correction device 8. The sound correction device 8 is
configured to suitably cope with the replacement of the audio device as follows.
[0061]
FIG. 7 shows an example of sound field correction at the time of device replacement. Here, it is
assumed that the power amplifier 3A is replaced with a power amplifier 3A 'of a different type,
and the power amplifier characteristic changes from A to A'.
[0062]
In this case, the sound correction device 8 receives the model ID of the power amplifier 3 after
replacement. More specifically, the model ID is read from the ID recording unit of the power
amplifier 3A 'after replacement, and is received by the ID receiving unit 831 of the sound
correction device 8 via the mixer / processor 6. Then, the power amplifier characteristic A ′
corresponding to the model ID is read out from the device characteristic database 832 and sent
to the filter coefficient calculation unit 841. The sound correction device 8 stores the model ID of
the power amplifier 3A before replacement, and the power amplifier characteristic 3A before
replacement can be obtained from the model ID. Further, the correction characteristic N before
the amplifier replacement is stored in the sound correction device 8. The filter coefficient
calculation unit 841 uses these parameters to calculate the correction characteristic N ′ after
device replacement according to the following equation. N =N×(A /A)
[0063]
Then, the filter coefficient calculation unit 841 sends the correction filter coefficient
corresponding to the correction characteristic N ′ to the mixer / processor 6 via the filter
coefficient transmission unit 842. In the mixer / processor 6, acoustic adjustment is performed
according to the correction filter coefficient.
[0064]
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Thus, in the present embodiment, a new correction characteristic N ′ can be obtained without
performing the acoustic characteristic using the test signal again at the time of device
replacement, and the acoustic frequency characteristic of the sound field 100 is required.
Frequency characteristics can be maintained.
[0065]
In the above example, the power amplifier was replaced.
However, the same process is performed when another audio device is replaced. That is, the
model ID after replacement is received by the sound correction device 8, and the correction filter
coefficient is obtained based on the device characteristic values before and after replacement
stored in the device characteristic database 832.
[0066]
Next, a modification of the present embodiment will be described. The following modifications
are also included in the scope of the present invention.
[0067]
In the above embodiment, the speaker 2 is connected to the mixer / processor 6 via the power
amplifier 3 in the output system. In a variant, powered speakers may be connected to the mixer /
processor 6. The powered speaker includes an ID recording unit and an ID transmission unit, and
transmits the model ID stored in the ID recording unit to the sound correction device 8 through
the mixer / processor 6. In addition, as for the input system, in the above embodiment, the
wireless microphone transmitter 4 and the wireless microphone receiver 5 are provided. In a
variant, an analog or digital wired microphone is connected to the mixer / processor 6. In this
case, the wired microphone includes an ID recording unit and an ID transmission unit, and
transmits the model ID stored in the ID recording unit to the sound correction device 8 through
the mixer / processor 6. As represented by these examples, the acoustic device is not limited to
FIG. 1 within the scope of the present invention.
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[0068]
FIG. 8 shows a mixer / processor 6 in another variant. In the above embodiment, the acoustic
correction device 8 was a computer device separate from the mixer / processor 6. In the example
of FIG. 8, the acoustic correction device 8 is incorporated in the mixer / processor 6. Therefore,
the internal configuration of the acoustic correction device 8 is included in the mixer / processor
6 in FIG. Further, the configuration of the communication relationship between the mixer /
processor 6 and the acoustic correction device 8 is deleted in FIG. In FIG. 8, the ID receiving units
611 and 612 of the mixer / processor 6 function as an ID receiving means of the present
invention.
[0069]
The acoustic system 1 according to the first embodiment of the present invention has been
described above. According to the present embodiment, model IDs of a plurality of acoustic
devices constituting the audio system 1 are collected, and device characteristic values
respectively corresponding to the plurality of model IDs are read out from the device
characteristic database 832. The acoustic adjustment amount is corrected so that the actual
acoustic characteristic in the sound field 100 approaches the required acoustic characteristic by
using not only the collected sound signal which is the measurement data but also the device
characteristic value, whereby the acoustic adjustment is performed. The amount can be corrected
with high accuracy. Moreover, since the device characteristic value corresponding to the received
model ID is read out from the device characteristic database 832, the work of the operator
manually inputting the device characteristic value can be reduced, and hence the sound
adjustment amount can be easily corrected.
[0070]
Further, in the present embodiment, when the audio device is replaced, the model ID of the
replaced audio device is received. Then, the acoustic adjustment amount is corrected based on
the device characteristic value of the acoustic device before replacement and the device
characteristic value of the acoustic device after replacement stored in the device characteristic
storage database 832. As a result, it is not necessary to re-measure the acoustic characteristics
when the acoustic device is replaced, and the amount of acoustic adjustment can be corrected
quickly and easily in accordance with the replaced acoustic device.
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[0071]
Further, in the present embodiment, the parameter for controlling the acoustic frequency
characteristic is corrected as the acoustic adjustment amount, the acoustic frequency
characteristic can be automatically adjusted, and the sound field correction can be performed
automatically.
[0072]
Second Embodiment Next, an acoustic system according to a second embodiment of the present
invention will be described.
In the first embodiment, the acoustic characteristic is an acoustic frequency characteristic, and
sound field correction is performed as acoustic correction. In the second embodiment, the
acoustic characteristic is volume, and volume correction is performed as acoustic correction.
Then, by considering the device characteristic value, highly accurate correction is performed to
match the actual volume characteristic of the sound field to the required volume characteristic.
The volume characteristic is the volume in the sound field, and the required volume
characteristic is the required volume. In the following description, the description of matters
overlapping with the first embodiment is appropriately omitted.
[0073]
In the second embodiment, the overall configuration of the audio system is the same as that of
the first embodiment shown in FIG. 1, and the speaker 2, the power amplifier 3, the wireless
microphone transmitter 4, and the wireless microphone receiver 5 Connected to the mixer /
processor 6, the mixer / processor 6 is connected to the acoustic correction device 8. The
configurations of the speaker 2, the power amplifier 3, the wireless microphone transmitter 4
and the wireless microphone receiver 5 are the same as those of the first embodiment shown in
FIG.
[0074]
FIG. 9 shows the configurations of the mixer / processor 6 and the acoustic correction device 8
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in the second embodiment. FIG. 9 shows a configuration related to volume correction that is
characteristic of the present embodiment. Although omitted in FIG. 9, the configuration related to
the sound field correction similar to that of the first embodiment is also provided in the mixer /
processor 6 and the sound correction device 8, and both the sound field correction and the
volume correction are performed. Good.
[0075]
In FIG. 9, the mixer / processor 6 includes a volume adjustment unit 631. The volume adjustment
unit 631 corresponds to the master volume function of the mixer. The volume adjustment unit
631 is connected to the audio signal transmission unit 602 and the audio signal reception unit
601. An audio signal from a sound source (not shown) is input to the volume adjustment unit
631 via the audio signal reception unit 601, undergoes volume adjustment, and is output from
the audio signal transmission unit 602, and the power amplifier 3 and the speaker 2 are Through
the sound field 100.
[0076]
The mixer / processor 6 also includes a volume correction coefficient receiver 632. The volume
correction coefficient receiver 632 receives the volume correction coefficient from the sound
correction device 8 and supplies the volume correction coefficient 631. The volume adjustment
unit 631 applies a volume correction coefficient to adjust the volume.
[0077]
On the other hand, the sound correction device 8 includes a sound volume calculation unit 851, a
sound volume correction coefficient calculation unit 852 and a sound volume correction
coefficient transmission unit 853. The sound volume calculation unit 851 calculates sound
volume information from the collected sound signal obtained when the test signal is output.
[0078]
Further, in the present embodiment, the device characteristic database 832 stores the
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characteristic value relating to the sound volume as the device characteristic value. The device
characteristic value is a characteristic value representing a change in volume when an audio
signal passes through an audio device, and can be said to correspond to the gain in the device.
Such device characteristic values are read out from the device characteristic database 832 and
supplied to the volume correction coefficient calculation unit 852.
[0079]
FIG. 10 shows an example of a device characteristic value related to volume, and specifically, in
the example of the diagram, the device characteristic value is a volume conversion coefficient
corresponding to a gain. Note that the volume conversion coefficient = 0 indicates that the
volume does not change.
[0080]
Further, in the present embodiment, the required characteristic input unit 821 inputs the
required sound volume characteristic as the required acoustic characteristic. The input required
volume characteristic is supplied to the volume correction coefficient calculation unit 852.
[0081]
The volume correction coefficient calculation unit 852 calculates a volume correction coefficient
using the measurement value of the volume calculated from the sound collection signal, the
device characteristic value, and the required volume characteristic. The principle of the
correction here is basically the same as the correction processing of the first embodiment
described with reference to FIG. However, the conversion factor of FIG. 10 is used as the device
characteristic value. And although each characteristic was a vector in FIG. 5, each characteristic
may be a scalar quantity here. Also, the required sound volume characteristic is used instead of
the required frequency characteristic. Further, volume information is used instead of the acoustic
frequency characteristic also for the measurement value obtained from the collected sound
signal. The volume correction coefficient corresponding to the correction characteristic thus
obtained is sent from the volume correction coefficient calculation unit 852 to the volume
correction coefficient transmission unit 853, and then transmitted to the volume correction
coefficient reception unit 632 of the mixer / processor 6, It is applied to the volume adjustment
of the adjustment unit 631.
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[0082]
FIG. 11 is a flowchart showing the operation of the audio system 1 in the present embodiment.
First, the sound correction device 8 collects information on the model ID of the sound device
constituting the sound system 1 and the connection relationship (S21). This process is similar to
that of the first embodiment. Next, the sound correction device 8 reads the device characteristic
value corresponding to all the collected model IDs from the device characteristic database 832
(S23). Here, as the device characteristic value, the volume conversion coefficient for each device
shown in FIG. 10 is read out and supplied to the volume correction coefficient calculation unit
852. Next, the sound correction device 8 receives an input of the required sound volume
characteristic as the required sound characteristic (S25). The required volume characteristic is
input from the required characteristic input unit 821 and supplied to the volume correction
coefficient calculation unit 852.
[0083]
Next, the sound correction device 8 performs processing of obtaining a measurement value by
outputting a test signal to the sound field 100 and collecting the test signal. First, the sound
correction device 8 controls the sound system 1 to output a test signal to the sound field 100
(S27). The test signal is sent from the acoustic correction device 8 to the mixer / processor 6,
processed by the volume adjustment unit 631 of the mixer / processor 6, and further output to
the sound field 100 through the power amplifier 3 and the speaker 2. Then, the voice of the test
signal is picked up, and the picked up signal is received by the voice signal receiving unit 811 of
the sound correction device 8 through the wireless microphone transmitter 4, the wireless
microphone receiver 5 and the mixer / processor 6. It is recorded in the sound correction device
8 (S29). The volume calculator 851 calculates volume information from the collected signal and
supplies the volume correction coefficient calculator 852 (S31).
[0084]
Next, the volume correction coefficient calculation unit 852 calculates a volume correction
coefficient using the volume measurement value obtained as described above, the device
characteristic value, and the required volume characteristic (S33). Then, the volume correction
coefficient is sent from the volume correction coefficient transmission unit 853 to the mixer /
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processor 6 and supplied to the volume adjustment unit 631 (S35). The volume adjustment unit
631 adjusts the volume according to the volume correction coefficient.
[0085]
The processes in steps S27 to S35 are repeatedly performed. Then, when the volume
characteristic of the sound field including the device characteristic approaches the required
volume characteristic sufficiently and the difference between the two characteristics falls within
the target range, this is judged in step S33, and the correction processing is completed.
[0086]
The volume correction before the start of operation has been described above. Next, the volume
correction when the audio device is replaced after the start of operation will be described. This
volume correction is performed in the same manner as the sound field correction at the time of
device replacement in the first embodiment described with reference to FIG. That is, when the
acoustic device (for example, the power amplifier 3) is replaced, the model ID after replacement
is received by the acoustic correction device 8, and the volume is calculated based on the device
characteristic values before and after replacement stored in the device characteristic database
832. A correction factor is determined.
[0087]
Next, a modification of the present embodiment will be described. As in the first embodiment, in
the second embodiment, the acoustic device is not limited to the above example. In the output
system, powered speakers may be connected to the mixer / processor 6. In addition, in the input
system, a wired microphone may be connected to the mixer / processor 6.
[0088]
Also, as shown in FIG. 12, the configuration of the acoustic correction device 8 may be
incorporated in the mixer / processor 6. In this case, the configuration of the communication
relationship between the mixer / processor 6 and the acoustic correction device 8 may be
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deleted.
[0089]
The acoustic system 1 according to the second embodiment of the present invention has been
described above. Also in the present embodiment, the volume is corrected as the sound
adjustment amount. Also according to the present embodiment, the amount of sound adjustment
can be easily corrected with high accuracy.
[0090]
Also according to the present embodiment, it is not necessary to re-measure the acoustic
characteristics at the time of replacement of the sound device, and the amount of sound
adjustment can be corrected quickly and easily according to the sound device after replacement.
[0091]
Further, in the present embodiment, the volume is corrected as the sound adjustment amount as
described above.
In the past, this type of volume correction was generally performed manually by a worker.
However, the sound system has become widespread, and some facilities are required to correct
the volume even without workers. According to the present embodiment, the volume correction
can be automated in response to such a request. In addition, the volume correction with high
accuracy becomes possible by considering the device characteristics.
[0092]
The preferred embodiments of the present invention have been described above. However, the
present invention is not limited to the above-described embodiment, and it goes without saying
that those skilled in the art can modify the above-described embodiment within the scope of the
present invention.
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[0093]
As described above, the sound system according to the present invention has an effect that the
amount of sound adjustment can be easily corrected with high accuracy, and is useful as a sound
system or the like of various facilities.
[0094]
Block diagram of acoustic system according to the first embodiment of the present invention.
Block diagram showing internal configuration of speaker, power amplifier, wireless microphone
transmitter and wireless microphone receiver. Block diagram showing internal configuration of
mixer / processor and acoustic correction device. Figure showing equipment characteristic
database Diagram showing correction processing of calculation characteristics Flow diagram
showing operation of sound field correction by acoustic system Diagram showing sound field
correction at the time of equipment replacement Diagram showing construction of acoustic
correction device in mixer / processor Diagram showing equipment characteristic database of
mixer / processor and acoustic correction device in the second embodiment of the present
invention. Flow diagram showing operation of volume correction by acoustic system.
Configuration showing acoustic correction device incorporated in mixer / processor. Figure
Explanation of sign
[0095]
1 sound system 2 speaker 3 power amplifier 4 wireless microphone transmitter 5 wireless
microphone receiver 6 mixer / processor 8 acoustic correction device 100 sound field
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