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JP2006324999

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DESCRIPTION JP2006324999
PROBLEM TO BE SOLVED: To provide a sound field control device capable of automatically
specifying a position of a generation source of musical instrument performance sound and
singing sound and automatically obtaining a speaker reproduction sound in which a sound image
is localized at this position. SOLUTION: A positioning unit 10 specifies a location of a wireless
microphone which is a transmission source of a received signal, based on the received electric
field strength in the wireless receiving devices R1 to R4. The sound image localization control
unit 30 drives each speaker from the audio signal received by the wireless reception devices R1
to R4 so that the sound having the sound image position determined by the positioning unit 10 is
output by the speakers SP1 to SP4. Synthesize [Selected figure] Figure 2
Sound field controller
[0001]
The present invention relates to a sound field control device suitable for sound field control in a
concert or the like.
[0002]
In order to form a sound field full of sense of reality in a concert or the like, an operation for
localizing the sound image of the reproduction sound of the speakers arranged at various places
to the position of the musical instrument or the singer is required.
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However, such an operation requires a high level of skill and is difficult to implement if it is an
expert. Japanese Patent Application Laid-Open No. 11-55784
[0003]
In order to solve the above problems, in addition to the existing sound image localization control
technology, a technology for specifying the position of a musical instrument or a singer is
essential. As a prior art which pinpoints the position of a sound source, there is a thing indicated
by patent documents 1. In this prior art, the voice of the speaker is picked up by the microphone
array, and the output signal of the microphone array is subjected to signal processing to
determine the position of the speaker. Therefore, it is conceivable to use this technology in a
concert or the like to specify the position of the sound source. However, in a live concert, for
example, it is difficult for the audience to accurately generate the position of the musical
instrument or the singer by the microphone array since the audience also generates sounds in
addition to the musical instrument or the singer.
[0004]
The present invention has been made in view of the above-described circumstances, and it is
desirable to accurately specify the position of the source of musical instrument performance
sounds and singing sounds and automatically obtain the speaker reproduction sound in which
the sound image is localized at this position. It is an object of the present invention to provide a
sound field control device capable of
[0005]
According to the present invention, a portable wireless transmission device carried by a player or
a singer and transmitting a wireless signal representing a performance sound or singing voice,
and receiving and outputting a wireless signal transmitted from the portable wireless
transmission device A plurality of wireless reception devices, positioning means for measuring a
location of a portable wireless transmission device as a transmission source of the wireless
signals based on received electric field strengths of wireless signals in the plurality of wireless
reception devices, a plurality of speakers A sound image for synthesizing signals for driving the
plurality of speakers from output signals of the plurality of wireless receiving devices such that
sounds having sound image positions at the location measured by the positioning means are
output by the plurality of speakers There is provided a sound field control apparatus
characterized by including localization control means.
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2
According to this invention, the position of the generation source of the performance sound or
the singing sound can be accurately specified, and the speaker reproduction sound in which the
sound image is localized can be automatically obtained at this position. In a preferred
embodiment, the sound field control device has a plurality of portable wireless transmission
devices each transmitting wireless signals of different channels as the portable wireless
transmission devices, and the plurality of wireless reception devices each have a plurality of
channels. Wireless signal can be received, and an electrical signal representing the received
wireless signal is output for each channel, and the positioning means and the sound image
localization control means measure the location of the portable wireless transmission device for
each channel. And combining signals for driving the plurality of speakers. According to this
aspect, the position of the generation source can be accurately specified for each generation
source of the performance sound and the singing sound, and the speaker reproduction sound in
which the sound image is localized can be automatically obtained at this position.
[0006]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. FIG. 1 is a plan view showing the configuration of a sound field control apparatus
according to an embodiment of the present invention. The sound field control device is a device
that controls the sound field of the concert hall. At the four corners of stage 1 of this concert hall,
wireless reception devices R1 to R4 are arranged. In addition, speakers SP1 to SP4 are disposed
around the spectator seat 2. An instrument player and a singer carry the wireless microphone M
and play and sing while walking around on the stage 1. These wireless microphones M convert
performance sound or singing sound into an audio signal which is an electric signal, modulate
the frequency of the carrier with this audio signal, and transmit it as a radio signal, which serves
as a portable wireless transmitter Play. The wireless reception devices R1 to R4 receive the
wireless signal transmitted from the wireless microphone M. The sound field control device
according to the present embodiment demodulates the audio signal from the radio signals
received by the wireless reception devices R1 to R4 to drive the speakers SP1 to SP4, and the
received electric field strength in the wireless reception devices R1 to R4. The location of the
wireless microphone M is determined based on the above, and the level adjustment of the drive
signal supplied to each speaker is performed so that the sound image of the reproduced sound of
the speakers SP1 to SP4 is localized at that location, sound field control of the concert hall It is
something to do. In the present embodiment, positioning of the wireless microphone M is
performed using the fact that the reception electric field strengths of the wireless reception
devices R1 to R4 change according to the location of the wireless microphone M. Therefore, as
the wireless microphone M, a configuration is used in which the carrier is frequency-modulated
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by an audio signal and transmitted so that the quality of the received signal is not deteriorated in
each of the wireless reception devices R1 to R4 even if the received electric field strength
changes. doing. However, frequency modulation is merely an example, and any modulation
scheme may be adopted as long as high quality reception signals can be obtained without being
affected by the reception electric field strength at the reception side.
[0007]
FIG. 2 is a block diagram showing the configuration of the sound field control apparatus in the
present embodiment. As illustrated, the sound field control device has a positioning unit 10, an
averaging processing unit 20, an effector 25, and a sound image localization control unit 30 in
addition to the above-described wireless reception devices R1 to R4. . FIG. 3 is a block diagram
showing a detailed configuration of a portion other than the sound image localization control
unit 30 of the sound field control device, and FIG. 4 is a block diagram showing a detailed
configuration of the sound image localization control unit 30.
[0008]
In the present embodiment, the wireless microphones M carried by the musical instrument
player and the singer transmit radio signals of mutually different channels frequency-modulated
by an audio signal obtained by, for example, sound collection. Each of the wireless reception
devices R1 to R4 is configured to be able to receive a maximum of n channels of wireless signals.
When a plurality of wireless microphones M are operating on the stage 1, each of the wireless
reception devices R1 to R4 receives wireless signals of a plurality of channels transmitted from
the wireless microphones M and demodulates them for each channel, The audio signal obtained
by demodulation is separated for each channel and output as shown in FIG. Each of the wireless
reception devices R1 to R4 has a function of detecting the reception electric field strength of
each channel and outputting the reception electric field strength data, and the wireless reception
device R1 receives the reception electric field strength data EAk (k = 1 to n). Wireless receiving
device R2 received electric field strength data EBk (k = 1 to n), wireless receiving device R3
received electric field strength data ECk (k = 1 to n), wireless receiving device R4 received
electric field strength data Output ED k (k = 1 to n).
[0009]
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The positioning unit 10 includes n positioning blocks 11-k (k = 1 to n). Here, each positioning
block 11-k is a transmission source of the radio signal of the k-th channel based on the ratio of
the reception electric field strength data EAk, EBk, ECk and EDk of the k-th channel output from
the radio reception devices R1 to R4. The location of the wireless microphone M is calculated,
and positioning data Pk indicating the location is output. The averaging processing unit 20
averages the audio signals of the respective channels output from the wireless reception devices
R1 to R4 by those corresponding to the same channel, and outputs the audio signals of the
respective channels. The effector 25 has effector blocks 26-k (k = 1 to n) prepared for each
channel. Each effector block 26-k performs an effect process such as reverberation addition on
the audio signal of the kth channel output from the averaging process unit 20, and outputs the
result to the sound image localization control unit 30 shown in FIG. 4.
[0010]
As shown in FIG. 4, the sound image localization control 30 includes a coefficient generator 31
and multipliers 32Ek (k = 1 to n), 32Fk (k = 1 to n), 32Gk (k = 1 to n) and 32Hk (k k = 1 to n),
adders 33E, 33F, 33G and 33H, and amplifiers 34E, 34F, 34G and 34H. The coefficient
generation unit 31 assigns weighting coefficients WEk and WFk for distributing audio signals to
the respective speakers so that sounds having sound image positions indicated by the positioning
data Pk are output by the four speakers SP1 to SP4 for each channel. , WGk and WHk are
generated. The multipliers 32Ek, 32Fk, 32Gk and 32Hk multiply the audio signal of the kth
channel by the weighting factors WEk, WFk, WGk and WHk corresponding to the kth channel,
respectively, to the adders 33E, 33F, 33G and 33H. Output. The adder 33E adds the
multiplication results of the multipliers 32Ek (k = 1 to n), and outputs the addition result. The
same applies to the other adders, and the adder 33F adds the multiplication results of the
multipliers 32Fk (k = 1 to n), and the adder 33G multiplies the multiplication results of the
multipliers 32Gk (k = 1 to n) The adder 33H outputs the addition result of each multiplication
result of the multipliers 32Hk (k = 1 to n). The amplifiers 34E, 34F, 34G and 34H amplify the
output signals of the adders 33E, 33F, 33G and 33H, and supply the amplified signals to the
speakers SP1 to SP4 as drive signals.
[0011]
In the configuration described above, when a musical instrument player or a singer performs
musical instrument performance or singing while walking on the stage 1, an audio signal of the
performance sound or the singing sound is transmitted from the wireless microphone M as a
wireless signal, and the wireless reception device R1 ˜ Received by R4. Then, the location of the
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wireless microphone M is determined by the positioning unit 10 based on the received electric
field strength in the wireless reception devices R1 to R4, and the sound image position of the
sound output from the speakers SP1 to SP4 by the sound image localization control unit 30. The
level adjustment of the drive signal supplied to each speaker is performed so that the position of
the wireless microphone M is localized. In the present embodiment, such level adjustment of the
drive signal supplied to each speaker is performed for each channel, that is, for each wireless
microphone M. Therefore, according to the present embodiment, the sound image positions of
the performance sounds and the singing sounds output from the speakers SP1 to SP4 are
automatically aligned with the positions of the musical instrument performer and the singer, and
a sound field rich in presence is formed. be able to.
[0012]
As mentioned above, although one Embodiment of this invention was described, other
embodiment besides this can be considered to this invention. For example: (1) In the above
embodiment, the musical instrument player and the singer carry the wireless microphone M as a
portable wireless transmission device, but the portable wireless transmission device is not limited
to the wireless microphone. For example, when a performer plays an electronic musical
instrument having a function of outputting an audio signal as an electrical signal, a portable
wireless transmission device that transmits the electrical signal as a wireless signal may be fixed
to the electronic musical instrument.
[0013]
(2) In the above embodiment, for all the wireless microphones M, the sound image of the speaker
reproduction sound picked up by each is localized at the location of the wireless microphone.
Alternatively, one or more wireless microphones M (for example, a singer and a specific musical
instrument) may be designated.
[0014]
(3) In addition to localizing the sound image of the speaker reproduction sound to the location of
the wireless microphone M determined by the positioning unit 10, a focus is placed near the
location of a specific wireless microphone M (for example, the wireless microphone M of the
singer). Alternatively, the spotlight may be illuminated.
[0015]
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(4) In the above embodiment, the audio signals output from the wireless reception devices R1 to
R4 are averaged among those corresponding to the same channel to generate the audio signal of
each channel.
Instead of averaging in this way, for example, an audio signal output from one of the radio
reception devices R1 to R4 with the highest received electric field strength may be selected as an
audio signal of that channel for each channel. Good.
Alternatively, for each channel, audio signals output from, for example, the first and second
receiving electric field strengths of the radio reception devices R1 to R4 may be averaged and
used as the audio signal of the channel.
[0016]
(5) Audio signals of a plurality of channels are multiplexed by, for example, time division
multiplexing, and the means for transmitting the multiplexed audio signals of a plurality of
channels through one digital radio channel is portable to a singer or a musical instrument player.
You may make it
[0017]
It is a top view which illustrates the concert hall in which the sound field control apparatus which
is one Embodiment of this invention was installed.
It is a block diagram which shows the structure of the sound field control apparatus. It is a block
diagram which shows the detailed structure of parts other than the sound image localization
control part of the sound field control apparatus. It is a block diagram which shows the detailed
structure of the sound image localization control part of the sound field control apparatus.
Explanation of sign
[0018]
M: wireless microphone, R1 to R4: wireless reception device, SP1 to SP4: speaker, 10: positioning
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unit, 30: sound image localization control unit.
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