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JP2007134891

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DESCRIPTION JP2007134891
To provide a speaker array system capable of performing calibration of a speaker unit with a
simple configuration. According to the present invention, an output speaker specifying means for
specifying n speakers, one speaker for outputting a calibration tone in order as an output
speaker, and a reference signal for outputting a calibration tone to the output speaker Calibration
target speaker specifying means for specifying a plurality of calibration target speakers having
equal distances to the output speaker, and a voice coil of the calibration target speaker according
to the calibration tone outputted from the output speaker An output signal acquisition means for
acquiring an output signal indicating a generated back electromotive force, a calculation means
for calculating a characteristic parameter indicating a characteristic of the speaker to be
calibrated from the output signal, and a speaker of the calibration object based on the
characteristic parameter A speaker array system comprising: calibration processing means for
generating calibration instructions that make characteristics identical. [Selected figure] Figure 1
Speaker array system and calibration method
[0001]
The present invention relates to a technique for calibrating the characteristics of each speaker in
a speaker array system.
[0002]
A speaker system in which a large number of speaker units are arranged is called a "speaker
array".
09-05-2019
1
In the speaker array, by controlling the delay and the gain given to the audio signal supplied to
each speaker unit, the directivity of the speaker can be sharpened and the direction of the
acoustic beam can be controlled. When the directivity is enhanced, the same energy is emitted to
a narrower range, so that the distance attenuation of the sound pressure becomes smaller, the
sound can be clearly heard far away, and the acoustic radiation in unnecessary directions is
suppressed. be able to. In addition, since the direction of the acoustic beam can be controlled, the
speaker does not have to be directed to the listening position of the sound, so that there is an
advantage that the restriction on the installation method of the speaker is reduced. A speaker
array of this type is disclosed, for example, in Patent Document 1. Unexamined-Japanese-Patent
No. 9-233591
[0003]
In order to operate the speaker array properly, it is necessary to equalize the characteristics of a
large number of speaker units constituting the speaker array. However, due to the limitations of
the manufacturing technology, the characteristics of the speaker unit are not completely uniform
but usually have a constant distribution. In this case, in order to make the characteristics of the
speaker units constituting the speaker array uniform, there is a method of selecting speaker units
having the same characteristics from manufactured speaker units and manufacturing the speaker
array using the selected speaker units. is there. However, this method has a problem that it takes
time to sort the speaker units, and further, there is a problem that the manufacturing yield is
lowered. In addition, as another method for equalizing the characteristics of the speaker units
constituting the speaker array, in the speaker array, the sound for calibration output from each
speaker unit is acquired by a microphone, and the speaker is based on the acquired sound. It is
conceivable to calibrate the unit. However, in this method, there is a problem that the
configuration of the calibration system becomes complicated because it is necessary to move the
microphone to the front of each speaker unit at the time of calibration.
[0004]
The present invention has been made in view of the above-described circumstances, and it is an
object of the present invention to provide a speaker array system capable of performing
calibration of a speaker unit with a simple configuration.
[0005]
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2
In order to solve the above-mentioned problems, the present invention comprises n (n 整数 3
integers) each having a voice coil and amplifying means for amplifying the tone signal to be
output to the voice coil according to a calibration coefficient. And an output speaker specifying
means for specifying one of the n speakers that outputs a calibration tone in order as an output
speaker according to a predetermined first rule, and the specifying means A reference signal
output unit for outputting a reference signal for outputting a calibration tone to the output
speaker, and a speaker to be calibrated which is a plurality of speakers having an equal distance
between the output speaker and each speaker from the n speakers Calibration target speaker
specifying means, and the calibration target speaker specifying means according to the
calibration tone outputted from the output speaker And output signal acquiring means for
acquiring an output signal indicating a back electromotive force generated in the voice coil of the
specified calibration target speaker, and a characteristic indicating the characteristic of the
calibration target speaker from the output signal acquired by the output signal acquisition means
The reference speaker specifying means for specifying one of the calibration target speakers as
the reference speaker according to the calculation means for calculating the parameter, the
second rule determined in advance, and the calibration target speaker calculated by the
calculation means A speaker array system comprising: calibration processing means for
generating a calibration instruction signal instructing update of the calibration coefficient so as
to compensate for a difference between the characteristic parameter and the characteristic
parameter of the reference speaker.
In this speaker array system, a speaker adjacent to the output speaker is used as a microphone.
Therefore, according to this speaker array system, it is not necessary to separately prepare a
microphone for calibration, and the speaker array system can be calibrated with a simple
configuration.
[0006]
In a preferred embodiment, in the speaker array system, the characteristic parameter is a
frequency characteristic, a phase characteristic, a reproduced sound pressure level, an impulse
response, or an efficiency of the calibration target speaker calculated from the output signal
acquired by the output signal acquiring unit. May be included.
[0007]
In a preferable aspect, the n speakers may be arranged in a matrix or in a zigzag, and the
calibration target speaker specifying unit may specify a speaker adjacent to the output speaker
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3
as a calibration target speaker.
In another preferred embodiment, the n speakers may be arranged in a straight line or a curved
line, and the calibration target speaker specifying unit may specify a speaker adjacent to the
output speaker as a calibration target speaker.
[0008]
In yet another preferred embodiment, the first rule may specify a speaker that has already been
calibrated after the second round as an output speaker. According to this speaker array system,
calibration of an uncalibrated speaker is performed using a speaker that has already been
calibrated. Therefore, calibration can be performed more appropriately.
[0009]
The present invention also provides a calibration method for n speakers (integer of n ス ピ ー カ
3) each having a voice coil and amplification means for amplifying the tone signal output to the
voice coil according to a calibration coefficient And an output speaker specifying step of
sequentially specifying one of the n speakers to which a calibration tone is to be output as the
output speaker according to a predetermined first rule, and calibration with respect to the output
speaker. A reference signal output step for outputting a reference signal for outputting a musical
tone; Identifying the correction target speaker specifying means according to the calibration tone
output from the output speaker Determining in advance an output signal acquiring step of
acquiring an output signal indicating a back electromotive force generated in a voice coil of the
speaker to be calibrated; calculating a characteristic parameter indicating characteristics of the
speaker to be calibrated from the output signal; A calibration step of identifying one of the
calibration target speakers as a reference speaker according to the second rule, and the
calibration coefficient to make the characteristics of the calibration target speaker the same on
the basis of the characteristic parameter And a calibration process step of generating a
calibration instruction that instructs updating of.
[0010]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
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4
<1. First Embodiment> FIG. 1 is a diagram showing a configuration of a speaker array system
1 according to a first embodiment of the present invention. The speaker array system 1 is a
speaker array having n (n 整数 3 integers) speakers 52 for forming an acoustic beam having any
directivity and direction. The control unit 10 includes a central processing unit (CPU) 11, a
memory 12, and an interface (IF) 13. The CPU 11 is a control device that controls each part of
the speaker array system 1. The IF 13 is an interface for transmitting and receiving data and
signals with the outside of the control unit 10. The memory 12 is a storage unit that stores
programs executed by the CPU 11 and various data. The control unit 10 also has a display for
notifying the user of the progress of the process, and a user interface such as a ten key for the
user to input an instruction (not shown).
[0011]
The signal processing unit 20 has a DSP (Digital Signal Processor), a memory and the like (all not
shown). The signal processing unit 20 performs signal processing (for example, delay processing)
for forming an acoustic beam from the n speakers 52 on the input musical tone signal under the
control of the control unit 10. The directivity and direction of the acoustic beam are specified by
the control signal. Information indicating the directivity and direction of the acoustic beam is
supplied from the control unit 10 to the signal processing unit 20. The signal processing unit 20
outputs, to each of the speaker units 50, musical tone signals subjected to signal processing
necessary for forming an acoustic beam.
[0012]
The speaker unit 50 includes an amplifier 51 and a speaker 52. The amplifier 51 includes an
amplifier, a D / A converter, a memory, and the like (all are not shown). The amplifier 51
performs signal processing such as amplification and digital / analog conversion on the input
musical tone signal and outputs the processed signal to the speaker 52. Each amplifier 51 stores
a calibration coefficient (details will be described later) for making the characteristics of the n
speaker units 50 uniform. The calibration coefficient is a value for compensating for the
difference between characteristic parameters to be described later. The amplifier 51 outputs a
tone signal in which characteristic parameters (details will be described later) such as the
efficiency of the speaker unit are adjusted in accordance with the calibration coefficient. The
speaker 52 has a voice coil and a vibrating plate (both not shown). The speaker 52 outputs
musical tones by vibrating the voice coil and the vibration plate in accordance with the input
musical tone signal. Thus, an acoustic beam having directivity and direction specified by the
09-05-2019
5
control signal is output from the n speaker units 50. The amplifier 51 stores an identifier that
identifies itself, that is, the speaker unit 50. In the following description, when it is necessary to
distinguish a specific speaker unit among the plurality of speaker units 50 from the other
speaker units, the speaker units 50-1 and 50-2 are added with a suffix to distinguish them. When
it is not necessary to distinguish them, they are simply described as “speaker unit 50”. The
same applies to elements other than the speaker unit 50.
[0013]
The reference signal generation unit 30 stores a reference signal used when calibrating the
speaker array system 1. The reference signal generation unit 30 outputs the stored reference
signal to the speaker unit 50 designated by the control unit 10. Here, the reference signal is a
signal serving as a basis for generating a musical tone (hereinafter referred to as "calibrated
musical tone") output from the speaker unit for use in calibrating the system. That is, the sound
output from the speaker unit according to the reference signal is a calibration tone. The
reference signal may be, for example, so-called impulse signal, TSP (Time Stretched Pulse), white
noise, a signal whose frequency is changed stepwise, or a usual music, as long as it is used as a
reference. When the reference signal is input, the speaker unit 50 designated by the control unit
10 outputs a calibration tone as in the case of the tone signal.
[0014]
For example, when a calibration tone is output from the speaker unit 50-2, the diaphragms of the
speakers (speakers 52-1 and 52-3) of the adjacent speaker unit vibrate with the calibration tone,
and a back electromotive force is generated in the voice coil. Do. The amplifier 51 amplifies the
back electromotive force generated in the voice coil and outputs it as an output signal to the
calibration processing unit 40. The calibration processing unit 40 analyzes an output signal
obtained from the back electromotive force to generate a calibration instruction (details will be
described later).
[0015]
FIG. 2 is a view showing the arrangement of the speaker units 50 in the speaker array system 1.
In the present embodiment, the n speaker units 50 are arranged in a matrix. Here, the matrix-like
arrangement means that the speaker units are arranged in a lattice form on a plane or a curved
09-05-2019
6
surface at equal intervals in the vertical and horizontal directions. That is, the distance between
two adjacent speaker units in the vertical direction or the lateral direction is constant. The
arrangement of the n speaker units 50 is not limited to the matrix arrangement, and may be
arranged in a straight line or a curved line.
[0016]
FIG. 3 is a flowchart showing the operation of the calibration process of the speaker array system
1. 4 to 7 are diagrams for explaining the calibration process of the speaker array system 1. In
FIGS. 4 to 7, each mass indicates a speaker unit 50. When the start of the calibration process is
instructed via the user interface, the CPU 11 of the control unit 10 first specifies a speaker unit
50 (hereinafter referred to as an "output speaker") for outputting a calibration tone (step S11). In
the present embodiment, one of the n speaker units 50 constituting the speaker array system 1 is
used as an output speaker to output a calibration tone, and the speaker units 50 around the
speaker unit 50 are calibrated. This calibration process is performed on the n speakers (or a part
of them) one by one as an output speaker.
[0017]
The specification of the output speaker is performed, for example, as follows. The memory 12
stores in advance identifiers of the n speaker units 50 constituting the speaker array system 1 in
association with information indicating the arrangement of the speaker units. Furthermore, the
memory 12 stores a rule that defines the order of output speakers among the n speaker units 50.
In the present embodiment, the speaker units 50 in the first row from the top and the second
column from the left in the matrix shown in FIG. 4 (the i-th row from the top and the j-th row
from the left in FIGS. The speaker unit 50 is referred to as “speaker unit 50 (i, j)” as a first
output speaker, and the process is advanced with the lower speaker unit 50 as an output speaker
one by one. If the speaker units 50 in the lowermost row become output speakers, then the
uppermost row speaker units 50 in the rightmost column by one column are used as output
speakers.
[0018]
As described above, the CPU 11 first specifies the speaker unit 50 (1, 2) as the output speaker
(FIG. 4 (a)). The CPU 11 further specifies a speaker to be calibrated with respect to the output
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7
speaker from the arrangement information of the speaker unit 50 stored in the memory 12.
Here, the calibration target speaker is the speaker unit 50 adjacent to the output speaker, and
means a plurality of speaker units 50 having the same distance from the output speaker. In the
example shown in FIG. 4A, since the output speaker is the speaker unit 50 (1, 2), the adjacent
speakers are the speaker unit 50 (1, 1), the speaker unit 50 (1, 3), the speaker unit Refers to
three speaker units of 50 (2, 2) (indicated by diagonal hatching in FIG. 4).
[0019]
The CPU 11 outputs, to the reference signal generating unit 30, an output instruction signal
instructing the output of the reference signal. The output instruction signal includes an identifier
that specifies the speaker unit 50 (1, 2) that is the output speaker. Further, the CPU 11 outputs,
to the calibration processing unit 40, a calibration instruction signal that instructs the calibration
processing unit 40 to calibrate the speaker to be calibrated. The calibration instruction signal is a
signal for instructing the calibration processing unit 40 to start the calibration process, and
includes information for specifying a speaker to be calibrated. In this case, the calibration
instruction signal specifies the speaker to be calibrated (in this case, three speaker units of
speaker unit 50 (1, 1), speaker unit 50 (1, 3), speaker unit 50 (2, 2)) Contains an identifier.
[0020]
When the output instruction signal is input, the reference signal generation unit 30 outputs the
reference signal to the speaker unit 50 identified by the identifier included in the output
instruction signal. The output speaker (speaker unit 50 (1, 2)) outputs a calibration tone
according to the reference signal (step S12).
[0021]
When the calibration tone is output from the output speaker, a back electromotive force is
generated in the voice coil of the speaker to be calibrated adjacent thereto. The amplifier 51 of
the speaker to be calibrated outputs the back electromotive force generated in the voice coil as
an output signal to the calibration processing unit 40 (step S13).
[0022]
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8
When the calibration instruction signal is input, the calibration processing unit 40 stores an
identifier for identifying a speaker to be calibrated, which is included in the calibration
instruction signal. After the calibration tone is output from the output speaker, when the output
signal is supplied from the calibration target speaker, the calibration processing unit 40
calibrates the calibration target speaker based on the output signal (step S14). The details are as
follows.
[0023]
The calibration processing unit 40 specifies a reference speaker as a reference at the time of
calibration from among the speakers to be calibrated according to a predetermined rule. In the
present embodiment, the speaker unit 50 located above the output speaker is specified as the
reference speaker. When the output speaker is the uppermost speaker unit 50 and there is no
speaker unit 50 located thereon, the calibration processing unit 40 specifies the speaker unit 50
located on the left of the output speaker as a reference speaker. In the example shown in FIG. 4A,
since the output speaker is located at the top, the left speaker unit 50 (1, 1) of the output speaker
is specified as the reference speaker. The control unit 10 may specify the reference speaker, and
the control unit 10 may output an identifier for specifying the reference speaker to the
calibration processing unit 40. In addition, as long as the rule for specifying a reference |
standard speaker can specify one speaker unit out of a structure object speaker, what kind of
thing may be used.
[0024]
The calibration processing unit 40 has a reference function or a reference table that stores
characteristic parameters together with an identifier that specifies the speaker unit in order to
obtain characteristic parameters such as the efficiency of the speaker unit 50 from the output
signal. The calibration processing unit 40 calculates a characteristic parameter of the reference
speaker from the reference function or reference table and the output signal from the reference
speaker. The calibration processing unit 40 stores the calculated characteristic parameter in
association with the identifier for specifying the reference speaker. Similarly, the calibration
processing unit 40 calculates characteristic parameters for the calibration target speakers other
than the reference speaker. The calibration processing unit 40 stores the calculated
characteristic parameter in association with the identifier that specifies the speaker to be
calibrated. Here, the characteristic parameter of the speaker unit is a response characteristic to
09-05-2019
9
the electric signal inputted to the speaker, which is analyzed from the output signal of the back
electromotive force of the speaker to be calibrated. Specifically, the characteristic parameters
refer to the frequency characteristic, phase characteristic, efficiency characteristic, reproduced
sound pressure level and impulse response of the speaker unit. The efficiency characteristic
means the conversion efficiency of a single speaker. Also, the reproduction sound pressure level
means the setting level of the entire system including the amplifier of the speaker, the setting
gain of the signal processing unit, and the like.
[0025]
The calibration processing unit 40 generates a calibration instruction based on the characteristic
parameter of the reference speaker and the characteristic parameter of the speaker to be
calibrated other than the reference speaker. For example, when the characteristic parameter
(efficiency) of the reference speaker is 90 dB and the efficiency of the calibration target speaker
is 88 dB, the calibration processing unit 40 compares the efficiency of the reference speaker and
the efficiency of the calibration target speaker (90 dB−88 dB = Calculate +2 dB as the calibration
value. The calibration value is information indicating the difference between the characteristic
parameter of the reference speaker and the characteristic parameter of the speaker to be
calibrated. The calibration processing unit 40 outputs a calibration instruction including the
calculated calibration value to the corresponding calibration target speaker. The calibration
processing unit 40 calculates calibration values for all the calibration target speakers other than
the reference speaker, and outputs a calibration instruction.
[0026]
When the calibration instruction is input, the amplifier 51 of the speaker unit 50 extracts a
calibration value from the calibration instruction. The amplifier 51 uses the extracted calibration
value to update the calibration coefficient stored so far. For example, if the calibration factor is to
adjust the efficiency of the speaker, the amplifier 51 updates the calibration factor by adding the
extracted calibration value to the calibration factor stored so far. For example, if the calibration
factor stored so far is “0 dB” and the calibration value is “+2 dB”, the calibration factor is
updated as “+2 dB”. The amplifier 51 performs a calibration process in accordance with the
stored calibration coefficient when performing an amplification process on the tone signal. That
is, the amplifier 51 performs amplification processing to increase the tone signal by +2 dB in
addition to normal amplification processing. Thus, the calibration coefficient is a value that is
cumulatively updated by the correction value.
09-05-2019
10
[0027]
As described above, in step S14, the calibration target speakers (in this case, three speaker units
of the speaker unit 50 (1, 1), the speaker unit 50 (1, 3), and the speaker unit 50 (2, 2)) The
characteristics are calibrated to be uniform. At this time, as shown in FIG. 4B, the three speaker
units of speaker unit 50 (1, 1), speaker unit 50 (1, 3), and speaker unit 50 (2, 2) are already
calibrated. , Will have the same characteristics.
[0028]
When the calibration instruction is output to all of the calibration target speakers other than the
reference speaker, the calibration processing unit 40 outputs, to the control unit 10, a
completion signal indicating that the calibration process on the calibration target speakers has
been completed. When the completion signal is input, the CPU 11 of the control unit 10 stores in
the memory 12 a flag indicating that the calibration of the speaker to be calibrated is completed.
The CPU 11 of the control unit 10 determines whether calibration has been completed for all the
speaker units 50 based on the flag stored in the memory 12 (step S15). One set of calibration
target speakers is calibrated by the series of processes of steps S11 to S15 described above.
Hereinafter, a series of processes of steps S11 to S15 that are repeatedly performed will be
referred to as a first round process, a second round process,..., An nth round process, in order.
[0029]
In the present embodiment, since calibration has not been completed for all the speaker units 50
(step S15: NO), the processing of steps S11 to S15 is repeatedly performed by changing the
output speaker. In the processes after the second round, one speaker unit is specified as an
output speaker from the already calibrated speaker unit 50 according to a predetermined rule.
Here, the speaker unit 50 (2, 2) located below the speaker unit 50 (1, 2) is specified as a new
output speaker (FIG. 5 (a), FIG. 3: step S11). Subsequently, the calibration tone is output from the
output speaker (speaker unit 50 (2, 2)) (FIG. 3: step S12).
[0030]
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11
When the calibration tone is output from the output speaker, an output signal is output from the
calibration target speaker adjacent to the output speaker. In this case, the calibration target
speakers are four speaker units: speaker unit 50 (1, 2), speaker unit 50 (2, 1), speaker unit 50 (3,
2), and speaker unit 50 (2, 3). (Indicated by hatching of horizontal lines in FIG. 5 (a)). The
calibration processing unit 40 specifies a speaker unit (speaker unit 50 (1, 2)) located above the
output speaker as a reference speaker. The calibration processing unit 40 generates a calibration
instruction to calibrate the characteristics of the calibration target speakers other than the
reference speaker so as to be the same as the characteristics of the reference speaker. By this
calibration instruction, the characteristic of the speaker to be calibrated is calibrated to be the
same as the reference speaker (step S14). Here, the characteristics of the reference speaker
(speaker unit 50 (1, 2)) in the second round processing and the characteristics of the reference
speaker (speaker unit 50 (1, 1)) in the first round processing do not necessarily match. Not.
Therefore, when the processing of the second round is completed, the characteristics of the
calibrated speaker are divided into two types: the same as the reference speaker in the first
round and the same as the reference speaker in the second round (see FIG. 5 (b).
[0031]
As described above, when the processes of steps S11 to S15 of FIG. 3 are repeatedly executed,
the characteristics of the n speaker units 50 are the same as those of the first round reference
speaker and the same characteristics as those of the second round reference speaker. It is divided
into two groups: ones and ones (Fig. 6). Therefore, the calibration processing unit 40 calibrates
the characteristics of these two groups of speakers into a single characteristic (FIG. 3: step S16).
The details are as follows.
[0032]
FIG. 7 is a diagram for explaining processing for unifying the characteristics of the two groups of
speakers into a single characteristic. The CPU 11 specifies two predetermined speaker units 50
as final output speakers in order to calibrate the characteristics of the n speaker units 50 to a
single characteristic. The final output speakers are speaker units 50 having different
characteristics, and are speaker units 50 adjacent to each other. In the example shown in FIG. 7,
two speaker units, ie, the speaker unit 50 (3, 4) and the speaker unit 50 (3, 5), are specified as
final output speakers. The calibration processing unit 40 generates an output instruction signal
including an identifier for identifying the final output speaker, and outputs the output instruction
signal to the reference signal generation unit 30.
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12
[0033]
Further, the CPU 11 specifies two predetermined speaker units 50 as final calibration target
speakers. The final calibration target speakers are speaker units 50 each having a different
characteristic, and are two speaker units 50 having the same distance to the final output speaker.
In the example shown in FIG. 7, two speaker units, ie, the speaker unit 50 (1, 3) and the speaker
unit 50 (1, 6), are specified as the final calibration target speakers. The following conditions may
be taken into consideration when identifying the optimal final calibration target speaker. That is,
if the final calibration target speaker is too close to the final output speaker, the characteristics of
the signal output from the final calibration target speaker are affected. In other words, since
there is a difference in the distance and path from each speaker unit 50 which is the final output
speaker to each speaker unit 50 which is the final calibration target speaker, the characteristics
of the signal outputted from the final calibration target speaker are affected. It spans. On the
other hand, if the final calibration target speaker is too far from the final output speaker, it will
be difficult to secure a sufficient signal level for the noise level. In consideration of the above
conditions, an optimal final calibration target speaker may be specified so as to obtain a
predetermined calibration accuracy.
[0034]
When the output instruction signal is input, the reference signal generation unit 30 outputs the
reference signal to the two speaker units 50 identified by the identifier included in the output
instruction signal. The final output speaker outputs a calibration tone in accordance with the
reference signal. The calibration processing unit 40 generates calibration instructions for the n
speaker units 50 based on the output signal output from the final calibration target speaker. That
is, the calibration processing unit 40 generates a calibration instruction so that the
characteristics of the two final calibration target speakers become the same. In order to make the
characteristics of these two final processing speakers identical, for example, the characteristics of
one of the two final calibration target speakers may be calibrated to be the same as the
characteristics of the other speaker. Alternatively, the characteristics of the two final calibration
target speakers may be calibrated to match the average value of the characteristics of the two
final calibration target speakers. Further alternatively, the characteristics of the two final
calibration target speakers may be calibrated so as to match the predetermined reference value.
[0035]
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13
The calibration processing unit 40 outputs the generated calibration instruction to each of the
speaker units 50. Each of the speaker units 50 updates the calibration coefficient in accordance
with the input calibration instruction. Thus, the characteristics of the n speaker units 50 are all
calibrated to be the same. According to this embodiment, the speaker adjacent to the output
speaker is used as a microphone. Therefore, it is not necessary to separately prepare a calibration
microphone, and calibration of the speaker array system can be performed with a simple
configuration. Further, according to the present embodiment, calibration of the uncalibrated
speaker is performed using the already calibrated speaker, so that the next speaker can be
calibrated using the latest data that has been calibrated. Furthermore, according to this
embodiment, it is not necessary to prepare reference data for calibration in advance.
[0036]
<2. Second Embodiment> Subsequently, a second embodiment of the present invention will
be described. In the following description, the same reference numerals are given to constituent
elements common to the first embodiment, and the description thereof is omitted. Further, in the
following description, descriptions of matters in common with the first embodiment will be
omitted, and differences from the first embodiment will be mainly described.
[0037]
FIG. 8 is a view showing the arrangement of the speaker units 50 in the speaker array system 2
according to the present embodiment. The speaker array system 2 has the same configuration as
the speaker array system 1 except that the arrangement of the speaker units 50 is different. In
the speaker array system 2, the n speaker units 50 are arranged in a staggered manner. Here, in
the matrix arrangement, the staggered arrangement means an arrangement in which the rows of
the speaker units are shifted in the arrangement direction of the rows every other row.
Alternatively, the staggered arrangement refers to an arrangement in which every other row of
speaker units in the matrix-like arrangement is shifted in the direction of arrangement of the
rows. The distance for shifting the rows or columns of the speaker units is 1/2 of the distance
between the speaker units. The distances between the speaker units in the left-right direction and
in the diagonal direction are equal.
[0038]
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14
9 to 11 are diagrams for explaining the calibration process of the speaker array system 2. In the
present embodiment, the CPU 11 first specifies the second speaker unit 50 from the left in the
top row as an output speaker (FIG. 9A). Furthermore, the CPU 11 specifies six speakers adjacent
to the output speaker as the calibration target speakers. When the output speaker is located at
the end, the number of calibration target speakers is five or less (FIG. 9A). Here, among the four
constituent speakers shown in FIG. 9A, the speaker unit 50 positioned first from the left in the
top row is specified as the reference speaker. When the first round calibration is completed in
this state, the four calibration target speakers are calibrated so as to have the same
characteristics (FIG. 9B).
[0039]
Subsequently, in the second round processing, the CPU 11 specifies one speaker unit among the
speaker units 50 for which the calibration is finished in the first round as an output speaker for
the second round according to a predetermined rule. (FIG. 10 (a)). Here, the predetermined rule
for specifying the output speaker may be based on, for example, the case where the speaker units
50 are arranged in a matrix. That is, first, the speaker unit 50 in the first row from the top and
the second column from the left is specified as the first output speaker. Hereinafter, the lower left
speaker unit 50 of the output speaker is specified as an output speaker one by one. If there is no
left speaker unit, or if the left speaker has already been calibrated, the right speaker unit is
identified as the output speaker. If the speaker units 50 in the bottom row become output
speakers, then the speaker units 50 in the top row of the right column are identified as output
speakers. Further, the CPU 11 specifies a speaker adjacent to the output speaker as a calibration
target speaker (FIG. 10A). Furthermore, the CPU 11 specifies the first speaker unit 50 from the
left in the top row as a reference speaker. Here, the second round reference speaker is the
speaker unit 50 that has been calibrated in the first round calibration processing. Therefore,
when the second round calibration is completed, the characteristics of the calibrated speaker unit
50 are all the same (FIG. 10 (b)).
[0040]
Subsequently, the CPU 11 specifies one of the speaker units 50 of the speaker units 50 whose
calibration has been completed up to the second cycle as an output speaker of the third cycle
according to a predetermined rule (FIG. 11A). . Further, the CPU 11 specifies the speaker unit 50
adjacent to the output speaker as the calibration target speaker. Even when the third round
calibration is completed, the speaker units 50 that have been calibrated so far are all calibrated
09-05-2019
15
so as to have the same characteristics (FIG. 11 (b)).
[0041]
As described above, by using the speaker units 50 that have already been calibrated as output
speakers in order, calibration can be performed so that all the characteristics of the n speaker
units 50 become the same. In the present embodiment, since the characteristics of the calibrated
speaker unit 50 are all the same, the process of step S16 of FIG. 3 is unnecessary.
[0042]
<3. Other Embodiments> The present invention is not limited to the above-described
embodiments, and various modifications can be made. In each of the above-described
embodiments, although the amplifier 51 stores the calibration coefficient and the calibration
coefficient of the amplifier 51 is updated according to the calibration instruction generated by
the calibration processing unit 40, the signal processing is performed instead of the amplifier 51.
The unit 20 may store the calibration coefficient of the characteristic parameter for each speaker
unit 50. In this case, the calibration processing unit 40 outputs the generated calibration
instruction to the signal processing unit 20. The signal processing unit 20 outputs, to the speaker
unit 50, musical tone signals that have been subjected to signal processing to compensate for
differences in characteristic parameters of the speaker units 50.
[0043]
Further, the order of specifying the output speakers is not limited to that described in the above
embodiment. The point is that the second and subsequent rounds can identify the already
calibrated one as the output speaker, and can calibrate all the speaker units (or a specific part of
the plurality of speaker units) constituting the speaker array. The output speakers may be
specified in any order.
[0044]
Further, in the above-described first embodiment, after the calibration process for all the speaker
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units 50 is completed, the process of making the characteristics of the speaker units 50 divided
into two groups the same (FIG. 3: step S16) The aspect which does) was demonstrated. However,
before performing the processes of steps S11 to S15 of FIG. 3 again, calibration is performed so
that the characteristics of the reference speakers of the first and second cycles become the same,
and thereafter, the processes of steps S11 to S15 of FIG. The processing may be repeatedly
executed.
[0045]
Further, in the second embodiment described above, since the speaker units 50 are arranged in a
staggered manner, a part of the calibration target speakers in the i-th round is a part of the
calibration target speakers in the (i-1) -th round In other words, a plurality of calibrations will be
performed on a certain speaker unit 50. Since this may cause an increase in processing time, the
control unit 10 or the calibration processing unit 40 stores a flag indicating that the speaker unit
50 has already been calibrated, and the speaker unit 50 that has been calibrated is It is also
possible not to perform the calibration.
[0046]
Moreover, although the aspect which specifies the speaker unit 50 adjacent to an output speaker
as a calibration object speaker was demonstrated in the above-mentioned each embodiment, a
calibration object speaker may not be adjacent to an output speaker. The point is that as far as a
group of speaker units having the same distance from the output speaker, one not adjacent to the
output speaker may be used as the calibration target speaker. For example, in the speaker units
50 arranged concentrically, the central speaker may be an output speaker, and the speaker units
50 having the same distance from the output speaker may be specified as a calibration target
speaker. In this case, since the characteristics of the speaker unit 50 are different for each
concentric circle, it is necessary to make the characteristics of the respective concentric circles
identical after the calibration process is completed for all the concentric circles.
[0047]
It is a figure showing composition of speaker array system 1 concerning a 1st embodiment. It is a
figure which shows arrangement | positioning of the speaker unit 50. FIG. 6 is a flowchart
showing an operation of calibration processing of the speaker array system 1; FIG. 6 is a diagram
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for explaining a calibration process of the speaker array system 1; FIG. 6 is a diagram for
explaining a calibration process of the speaker array system 1; FIG. 6 is a diagram for explaining
a calibration process of the speaker array system 1; FIG. 6 is a diagram for explaining a
calibration process of the speaker array system 1; It is a figure which shows arrangement |
positioning of the speaker unit 50 in 2nd Embodiment. FIG. 6 is a diagram for explaining a
calibration process of the speaker array system 2; FIG. 6 is a diagram for explaining a calibration
process of the speaker array system 2; . FIG. 6 is a diagram for explaining a calibration process of
the speaker array system 2;
Explanation of sign
[0048]
DESCRIPTION OF SYMBOLS 1 ... Speaker array system, 2 ... Speaker array system, 10 ... Control
part, 11 ... CPU, 12 ... Memory, 13 ... IF, 20 ... Signal processing part, 30 ... Reference signal
generation part, 40 ... Calibration processing part, 50 ... Speaker unit, 51: amplifier, 52: speaker
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