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DESCRIPTION JP2005295308

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DESCRIPTION JP2005295308
PROBLEM TO BE SOLVED: To provide a speaker array with a sense of localization while
maintaining good frequency characteristics. SOLUTION: Multipliers 510A to I weight supplied
audio signals by weighting coefficients C1 to C9. The weighting means 500 is divided into a first
group including multipliers 510A to 510E and a second group including multipliers 510E to
510I, and an audio signal is generated with a weighting factor determined based on the Bessel
function for each group. Weighting is performed. The weighted audio signal is amplified by the
amplification means 600 and then supplied to the speaker array 200. [Selected figure] Figure 1
Audio signal supply device
[0001]
The present invention relates to a technique for supplying an audio signal to a speaker array
configured by a plurality of speakers.
[0002]
There is known a speaker array that regularly arranges a plurality of speakers to produce sound.
The speaker array tends to concentrate the sound in a beam, and has the problem that this
tendency is more pronounced as the frequency of the sound is higher and the number of
speakers is larger. Such concentration of sound may not be preferable, and there is a technique
described in Patent Document 1, for example, as a technique for solving this. Patent Document 1
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describes a technology for distributing sounds emitted from a speaker array radially by
weighting a regularly arranged speaker string with a coefficient string based on a Bessel
function. Japanese Examined Patent Publication 1-25480
[0003]
According to the technique disclosed in Patent Document 1, it is possible to prevent the high
frequency sounds from being concentrated in a beam shape in the speaker array, distribute the
sounds radially, and obtain good frequency characteristics. However, weighting each speaker
with a coefficient series based on the Bessel function makes it possible to obtain the effect of
radially distributing the sound, which makes it difficult to obtain a sense of localization of the
sound image, and gives a sense of presence when listening to music etc. There was a problem
that it was difficult.
[0004]
The present invention has been made under the above-described background, and it is an object
of the present invention to provide an audio signal supply device that enables a speaker array to
have a sense of localization of a sound image while maintaining good frequency characteristics.
Do.
[0005]
In order to solve the problems described above, the present invention is an audio signal supply
apparatus for supplying audio signals to a plurality of speakers constituting a speaker array, the
apparatus comprising: signal input means for receiving audio signals; The audio signal branched
by the branching means is grouped according to branching means for branching the audio signal
into the number of speakers and the speakers grouped into at least two or more groups in the
speaker array Weighting means for weighting each audio signal in accordance with the number
of speakers for each group and the arrangement of each speaker according to the Bessel
coefficient for each speaker, and each of the audio signals weighted by the weighting means to
the corresponding speakers Means for supplying audio signal Providing an audio signal
supplying device for Bei.
In this audio signal supply device, the input audio signal is branched into the same number as the
number of speakers, and each branched audio signal corresponds to the speaker grouped into at
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least two or more groups and is grouped It is divided. Each audio signal is weighted according to
the Bessel coefficient for each speaker determined by the number of speakers and the
arrangement of each speaker for each group, and the weighted audio signal is supplied to the
corresponding speaker. With this audio signal, the speaker array is similar to having two or more
speaker arrays, directivity is given to the sound output from the speaker array, and a sense of
localization is generated in the sound.
[0006]
In the above configuration, an audio signal weighted by a weighting factor having a negative
value among the weighting factors is supplied to the speakers arranged in the longitudinal
direction outside of the arrangement of the speakers constituting the speaker array. It is
desirable to do.
[0007]
Further, in the above configuration, the plurality of speakers constituting the speaker array are
divided into two groups, and the weighting means causes the audio signal branched by the
branching means to correspond to the two groups. It is desirable to weight each audio signal
according to a Bessel coefficient for each speaker determined by grouping and setting the
number of speakers and the arrangement of each speaker for each group.
[0008]
Further, in the above configuration, a wide directivity selection instruction for instructing the
directivity characteristics of the speaker array to be wide directivity and a narrow directivity for
instructing the directivity characteristics of the speaker array to be narrow directivity Having a
selection instruction accepting unit for accepting an orientation selection instruction, and
receiving the wide directivity selection instruction, according to the number of a plurality of
speakers constituting the speaker array and the Bessel coefficient for each speaker determined
by the arrangement of each speaker, The audio signals to be supplied to the respective speakers
are weighted, and when the narrow directivity selection instruction is received, the branching
unit is caused to correspond to the speakers grouped into at least two or more groups in the
speaker array. Divide the branched audio signals into groups, and by the number of speakers for
each group and the arrangement of each speaker According Bessel coefficients for the speakers
determined, it is desirable to perform the weighting of each audio signal.
[0009]
According to the present invention, in the speaker array, localization of a sound image can be
obtained while maintaining good frequency characteristics.
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[0010]
[A.
First Embodiment] FIG. 1 is a diagram showing a main configuration of a speaker array system
100 according to an embodiment of the present invention.
The speaker array system 100 includes a speaker array 200 configured of a plurality of
speakers, a weighting unit 500, and an amplification unit 600, and weights the supplied audio
signal with a coefficient based on the Bessel function. The weighted audio signals are provided to
the speaker array 200 to emit sound.
As shown in FIG. 2, the speaker array 200 is configured by nine speakers 210A to 210I linearly
arranged at substantially constant intervals in an elongated enclosure (housing).
Also, a method of emitting sound by weighting an audio signal with a coefficient based on a
Bessel function is omitted because it is well known in the prior art, but as a reference document,
"Multiple Iodspeaker arrays using Bessel coefficients" (WJW KITZEN, ELECTRONIC
COMPONENTS AND APPLICATIONS, VOL. 5 NO. 4, SEPTEMBER 1983) and the like.
[0011]
The weighting means 500 is constituted by the same number of multipliers 510A-I as the
number of loudspeakers constituting the loudspeaker array 200. Each multiplier applies
weighting (gain) to the supplied audio signal by using weighting factors C1 to C9, and supplies
the weighted audio signal to the amplification means 600. Here, the weighting factors C1 to C9
used for weighting are derived as follows. As in the present embodiment, when nine speakers are
used, first, the multipliers 510A to 510I are divided into a first group including the multipliers
510A to 510E corresponding to the speakers 210A to 210E, and the speakers E to I. Are divided
into two groups of a second group consisting of multipliers 510E-I. Then, a Bessel coefficient to
be given to the multiplier is determined for each group using a Bessel function expressed by the
following equation.
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[0012]
As in the present embodiment, when one group is configured by five multipliers, the Bessel
coefficients assigned to five multipliers forming each group are, for example, J-2 (1.5) to The
value of J2 (1.5) is used, and each Bessel coefficient is J-2 (1.5) = 0.2321, J-1 (1.5) =-0.5579, J0
(1.5) = 0.5118, J1 (1.5) = 0.5579, and J2 (1.5) = 0.2321. The obtained Bessel coefficients are, as
shown in the table of FIG. 3, in the first group, multiplier 510A = 0.2321, multiplier 510B = 0.5579, multiplier 510C = 0.5118, multiplication J-2 (1.5) = 0.2321 to the speaker 210A so that
the negative order Bessel coefficient is located outside the enclosure, such as the multiplier 510D
= 0.5579 and the multiplier 510E = 0.2323. Are assigned to the multiplier 510A, and J2 (1.5) =
0.2321 is assigned to the multiplier 510E corresponding to the centrally located speaker 210E.
Further, as shown in FIG. 3, in the second group, multipliers 510E = 0.2323, multipliers 510F =
0.5579, multipliers 510G = 0.5118, multipliers 510H = -0.5579, multiplication J-2 (1.5) =
0.2321 is assigned to 510I corresponding to the speaker 210I so that the Bessel coefficient of
negative order is located outside the enclosure, such as Assign 1.5) = 0.2321 to the multiplier
510E corresponding to the centrally located speaker 210E.
[0013]
The weighting factors C1 to C9 assigned to the respective multipliers are determined by the
addition of the Bessel coefficients of the first group and the second group, as shown in FIG. The
weighting factor C5 assigned to the multiplier E belonging to both the first group and the second
group among the multipliers 510A to I is a factor “0.2323” assigned as the first group and a
second group The addition result with the assigned coefficient “0.2323” is “0.4642”.
Further, since the multipliers other than the multiplier E only belong to either the first group or
the second group, the weighting factors C1 to C4 assigned to the multipliers 510A to D are such
that C1 = 0. Thus, the coefficients C6 to C9 given to the multipliers 510F to I become C6 =
0.5579, C7 = 0.5118, C8, and C2 = -0.5579, C3 = 0.5118, and C4 = 0.5579. =-0.5579, C9 =
0.2321.
[0014]
The amplification means 600 is constituted by the same number of amplifiers 610 A to I as the
speakers constituting the speaker array 200, and amplifies the audio signal weighted by the
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weighting means 500. Specifically, the amplifiers 610A-I amplify the audio signal supplied from
the multiplier connected to each amplifier, and supply the amplified audio signal to the speakers
connected to each amplifier. The audio signal supplied to the speaker array 200 is input to the
speakers constituting the speaker array 200, and is output as an audio sound.
[0015]
As described above, the audio signal supplied to the speaker array system 100 is weighted by the
weighting unit according to the weighting coefficient obtained using the Bessel function,
amplified by the amplification unit 600, and converted to a sound wave by the speaker array
200. Converted and output. The conventional speaker array system in which the speakers are
simply arranged without weighting the audio signal tends to concentrate the sound in a beam
shape, making it difficult to obtain a sense of sound spread. However, according to the present
system, the audio signal is weighted by the coefficient using the Bessel function, and the sound is
emitted according to the weighted audio signal, so the sound spreads radially and the sound has
a sense of spreading. You can Also, rather than simply weighting the audio signal according to
the Bessel function, a plurality of speakers are divided into two groups, and weighting is
performed with each group as one speaker array. Thus, although the speaker array 200 is
configured as one speaker array in appearance, it is similar to the configuration combining two
speaker arrays each having directivity, and sound image localization by stereo sounding is
possible. Become. Further, since the sum of squares of the coefficients of the Bessel function is 1
or less, the speaker output can be increased as compared with the case where the audio signal is
simply weighted according to the Bessel function with the speaker array 200 as one group.
[0016]
[B. Second Embodiment] Next, a second embodiment of the present invention will be
described. In the second embodiment described below, parts having the same configuration as
the first embodiment are given the same reference numerals as the first embodiment, and the
description thereof is omitted.
[0017]
FIG. 4 is a diagram showing the main configuration of the speaker array system 100A according
to the present embodiment. The second embodiment of the present invention is different from
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the first embodiment in that the operation unit 700 and the control unit 400 are provided, and
the weighting means 500 is provided with a weighting factor in accordance with a signal
supplied from the control unit 400. It is a point to be different.
[0018]
The operation unit 700 is a means for inputting a selection instruction for selecting the
directivity of the speaker array 200, and includes various operation buttons. When the first
button is pressed, the operation unit 700 outputs a signal instructing to emit sound radially to
the control unit 400, and when the second button is pressed, directivity is applied to the speaker
array 200. The control unit 400 outputs a signal instructing the control unit 400 to hold the
signal.
[0019]
The control unit 400 stores weighting factors C11 to C19 and weighting factors C21 to C29. The
weighting coefficients C11 to C19 are coefficients for achieving wide directivity, and are
coefficients generated using a Bessel function. As in the present embodiment, when the speaker
array is configured by nine speakers, the coefficients C11 to C19 assigned to nine multipliers
corresponding to each speaker are, for example, J-4 (1 .5) The values of J4 (1.5) are used. The
weighting coefficients C21 to C29 are coefficients for giving directivity to the speaker array 200,
and have the same values as the coefficients C1 to C9 in the first embodiment described above.
Control unit 400 selects weighting factor C10 to C19 or weighting factor C20 to C29 according
to the signal supplied from operation section 700, and supplies coefficient information indicating
the selected factor to each multiplier of weighting means 500. .
[0020]
The weighting means 500 is constituted by the same number of multipliers 520A to 520I as the
number of speakers constituting the speaker array 200. The multipliers 520A to 520I can
change the weight given to the audio signal, and each multiplier weights the audio signal
according to the coefficient information supplied from the control unit 400.
[0021]
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Next, the operation of the speaker array system 100A according to the present embodiment will
be described. When the user of the speaker array system 100A presses the first button, the
operation unit 700 outputs a signal instructing to emit sound radially to the control unit 400.
When this signal is input, the control unit 400 selects the weighting coefficients C11 to C19, and
supplies coefficient information indicating the selected coefficients to the weighting means 500A.
Here, the coefficient information indicating the coefficient 11 is to the multiplier 520A, the
coefficient information indicating the coefficient 12 is to the multiplier 520B, and the individual
coefficient information indicating the coefficients C11 to C19 is to the corresponding multipliers
520A to 520I. Supplied. When the coefficient information is supplied, each of the multipliers
520A to 520I weights the audio signal according to the supplied coefficient information, and
supplies the weighted audio signal to the amplification means 600. The weighted audio signal is
amplified by the amplifiers 610A to 610I of the amplification means 600 and then supplied to
the speaker array 200. The audio signals output from the amplifiers 610A to 610I are input to
the speakers connected to the amplifiers and output as audio sound. Since the audio signal
supplied to each speaker is weighted by a coefficient for achieving wide directivity generated
using a Bessel function, the sound wave output from each speaker radially spreads in space.
[0022]
When the user of the speaker array system 100 presses the second button, the operation unit
700 outputs, to the control unit 400, a signal instructing the speaker array 200 to have
directivity. When this signal is input, control unit 400 selects weighting coefficients C21 to C29,
and supplies coefficient information indicating the selected coefficient to weighting means 500A.
Here, the coefficient information indicating the coefficient 21 is to the multiplier 520A, the
coefficient information indicating the coefficient 22 is to the multiplier 520B, and the respective
coefficient information indicating the coefficients C21 to C29 is to the corresponding multipliers
520A to 520I. Supplied. When the coefficient information is supplied, each of the multipliers
520A to 520I weights the audio signal according to the supplied coefficient information, and
supplies the weighted audio signal to the amplification means 600. As in the first embodiment,
the audio signal supplied to each speaker is a coefficient generated using a Bessel function, and is
weighted by a coefficient that gives directivity to each group of the speaker array. There is a
sense of localization of the sound image.
[0023]
As described above, according to the present embodiment, since the radiation characteristics of
the sound output from the speaker array 200 can be switched, when enjoying the music, the
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sound has a sense of localization and the user can feel a sense of presence, When listening to
news or the like, it is possible to switch the directivity of the speaker array appropriately
according to the contents of the audio signal, such as outputting the sound radially and listening
by a large number of people.
[0024]
[C.
Modifications] Although the embodiments of the present invention have been described above,
the present invention is not limited to the above-described embodiments, and can be practiced in
various other forms. For example, the above-described embodiment may be modified as follows
to implement the present invention.
[0025]
Although the speakers 210A to 210I are linearly arranged in the embodiment described above,
the arrangement of the speakers is not limited to the arrangement shown in FIG. For example, as
shown in FIG. 5, the speakers may be arranged in two vertical rows alternately displaced in the
lateral direction, or in multiple rows. Further, the speakers may be arranged not only in the
longitudinal direction but also in one or more rows in the lateral direction.
[0026]
In the above-mentioned embodiment, although five speakers are made into one group, the
number of speakers belonging to one group is not limited to five. Further, the number of groups
is not limited to two, and may be divided into two or more groups. Also, the number of speakers
is not limited to nine, and may be other than nine. For example, when the number of speakers is
eight, as shown in FIG. 6, four speakers are made into one group, and the audio signal is
weighted with a weighting factor based on the Bessel function for each group.
[0027]
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BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the principal part structure of
the speaker array system which concerns on 1st Embodiment of this invention. It is a figure
which shows the external appearance of the speaker array concerning the embodiment. It is a
figure which shows the coefficient provided to the multiplier concerning the embodiment. It is a
figure which shows the principal part structure of the speaker array system concerning 2nd
Embodiment of this invention. It is a figure which shows the external appearance of the speaker
array concerning the modification of this invention. It is a figure which shows the external
appearance of the speaker array concerning the modification of this invention.
Explanation of sign
[0028]
100, 100A: speaker array system, 200: speaker array, 210: speaker, 400: control unit (selection
instruction receiving means), 500: weighting means, 510, 520: multiplication , 600: amplification
means (audio signal supply means), 610: amplifier, 700: operation unit.
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