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DESCRIPTION JP2006222669

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DESCRIPTION JP2006222669
PROBLEM TO BE SOLVED: To provide a speaker array device capable of clearly listening to a
plurality of listeners in a certain area. SOLUTION: Each speaker 15 constituting the speaker array
14 of the speaker array device 1 is divided into a plurality of speaker units, and delay control of
sound emitted from each speaker 15 is performed for each unit to output a sound beam.
Moreover, the output timing of the audio | voice beam which each speaker unit outputs is
adjusted (delayed). As a result, a plurality of voice beams can be focused, and each focal point
can be arranged in a band. That is, since a band-like area with high sound pressure can be
formed, voice can be clearly heard to a plurality of listeners in this area. In addition, the number
of sound beams can be increased by adjusting the number of speakers constituting the speaker
array or outputting a plurality of sounds from each speaker, so that the area where the sound can
be heard clearly to the listener Can be further expanded. [Selected figure] Figure 3
Speaker array device
[0001]
The present invention relates to a speaker array device that outputs a plurality of audio beams.
[0002]
Conventionally, a technology related to a speaker device capable of forming an audio beam and
controlling its directivity by arranging a plurality of speakers in a linear shape or a planar shape
and controlling the gain and output delay time of the sound emitted from each speaker Are
disclosed (see, for example, Patent Document 1).
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1
Unexamined-Japanese-Patent No. 9-233591
[0003]
In the speaker device described in Patent Document 1, the sound image can be localized in front
of the listener by reflecting the sound beam on the wall surface. In addition, since the radiation
angle of the sound beam can be adjusted by using this speaker device, it is possible to clearly
listen to one to several listeners in a place where there are a plurality of listeners. it can.
[0004]
However, this speaker device has not been able to clearly listen to a large number of listeners
(for example, dozens of listeners) who are in a wider area. In addition, when sound is reflected by
the wall, the sound is partially reflected in a direction different from the intended direction or the
sound is slightly absorbed by the wall, so that there is a problem that the energy of the sound is
somewhat attenuated.
[0005]
Therefore, an object of the present invention is to provide a speaker array device capable of
clearly listening to a plurality of listeners who are present in an area having a certain size.
[0006]
The present invention is provided with the following configuration as means for solving the
above-mentioned problems.
[0007]
(1) A speaker array in which a plurality of speakers are arranged, and beam control means for
controlling a beam of sound output from the speaker array by controlling an input timing of an
audio signal to each speaker, The beam control means is characterized by setting a plurality of
speaker units in which a part of the plurality of speakers is one unit, and controlling the beams
so as to focus on different close positions for each speaker unit.
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[0008]
In this configuration, the speaker array device causes the plurality of audio beams to be output
so as to focus, respectively, and places each focus close to different positions.
As a result, it is possible to form a high sound pressure area in a band or a circle, and it is
possible to clearly listen to the listener in the area.
For example, in a large space such as a concert hall, the high sound pressure area formed by
bringing the focal points of a plurality of audio beams close to one another is set to be positioned
near the center of all the seats. Can hear the voice clearly.
Further, since the sound is emitted directly into the space, the sound is not absorbed or diffusely
reflected by the wall or the like, and the attenuation of the sound energy can be prevented.
[0009]
(2) The beam control means is characterized in that a part or all of the speaker unit overlaps
another speaker unit.
[0010]
In this configuration, some or all of the speaker units overlap other speaker units, and at least
some of the speakers belong to a plurality of speaker units, so a plurality of sounds are emitted
from these speakers. Multiple voice beams can be formed.
Therefore, the number of audio beams can be increased without increasing the number of
speakers, and the high sound pressure area can be expanded.
[0011]
(3) An operation means for receiving a movement input of the focal point of the sound beam is
provided, and the beam control means adjusts the gain and the sound emission timing of the
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3
sound emitted from each speaker according to the operation received by the operation means. To
move the focal position of the audio beam.
[0012]
In this configuration, the speaker array device can move the focal position of the sound beam by
operating the operation means.
Therefore, by operating to move the focus positions of a plurality of sound beams
simultaneously, it is possible to move the high sound pressure area, and the sound can be
amplified to a desired area.
[0013]
The speaker array device according to the present invention outputs a plurality of sound beams
from the speaker array and places the focal points of the respective sound beams close to each
other, thereby forming a high sound pressure area such as band or circle by these focal points.
As a result, it is possible to listen to the voice clearly to the listener who is in this high sound
pressure area.
[0014]
FIG. 1 is a block diagram showing a schematic configuration of a speaker array device according
to an embodiment of the present invention.
FIG. 2 is a block diagram of the speaker array, where (A) shows the case where the speakers are
arranged in a matrix, and (B) shows the case where the speakers are arranged in a honeycomb.
[0015]
The speaker array device 1 includes an audio input terminal 2, an A / D converter 3, a plurality
of audio beam forming units 4 (4 a to 4 e), and a speaker array 14. Each audio beam forming unit
4 includes a time alignment unit 5, a band division unit 6, an oversampling unit 7, a delay control
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unit 8, a downsampling unit 9, a window filter unit 10, a band synthesis unit 11, a speech
synthesis unit 12, D / An A converter 13 and a speaker array 14 are provided.
[0016]
The audio input terminal 2 is for connecting an external device that outputs an audio signal.
[0017]
The A / D converter 3 converts an analog voice signal input from the voice input terminal 2 into
a digital voice signal.
The sampling frequency of the A / D converter 3 is set to 48 kHz as an example.
[0018]
Here, the speaker array device 1 includes the sound beam forming units 4 by the number of
sound beams output from the speaker array 14. In the configuration shown in FIG. 1, as an
example, voice beam forming units 4a to 4e are provided, and up to five voice beams can be
output. Since the configurations of the voice beam forming units 4a to 4e are the same, only the
configuration of the voice beam forming unit 4a is shown in FIG.
[0019]
The time alignment unit 5 adjusts the output timing of the input audio signal converted by the A
/ D converter 3, and adjusts the output timing of the audio beam that each audio beam forming
unit 4 outputs from the speaker array 14.
[0020]
The band dividing unit 6 divides the audio signal whose output timing has been adjusted by the
time alignment unit 5 into frequency bands.
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In the example shown in FIG. 1, the signal is divided into four bands: low, low, middle, high, and
high. Here, the band dividing unit 6 includes a band dividing unit 6a that outputs a low band
audio signal, a band dividing unit 6b that outputs a low middle band audio signal, a band dividing
unit 6c that outputs a middle high band audio signal, It comprises a band division unit 6d for
outputting an audio signal in the range.
[0021]
The oversampling unit 7 raises the sampling frequency of the audio signal sampled at the
sampling frequency of 48 kHz to 192 kHz as an example, and resamples (oversamples). Here, the
oversampling unit 7 includes an oversampling unit 7a connected to the band dividing unit 6a, an
oversampling unit 7b connected to the band dividing unit 6b, an oversampling unit 7c connected
to the band dividing unit 6c, and a band division It comprises an oversampling unit 7d connected
to the unit 6d.
[0022]
The delay control unit 8 individually adjusts the emission timing of the audio signal output from
each of the speakers 15 constituting the speaker array 14 in order to form the audio emitted
from the speaker array 14 as an audio beam. Here, the delay control unit 8 includes a delay
control unit 8a connected to the oversampling unit 7a, a delay control unit 8b connected to the
oversampling unit 7b, a delay control unit 8c connected to the oversampling unit 7c, and It
comprises a delay control unit 8d connected to the sampling unit 7d.
[0023]
The downsampling unit 9 reduces the sampling frequency of the audio signal oversampled at
192 kHz to 48 kHz (downsampling). Here, the downsampling unit 9 includes a downsampling
unit 9a connected to the delay control unit 8a, a downsampling unit 9b connected to the delay
control unit 8b, a downsampling unit 9c connected to the delay control unit 8c, and a delay It
comprises a downsampling unit 9d connected to the control unit 8d.
[0024]
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The window filter unit 10 incorporates a gain control function, and adjusts the gain of the sound
emitted from each speaker 15 of the speaker array 14. In addition, the window filter unit 10 has
a window function set for each band, and suppresses the occurrence of side lobes in the sound
beam emitted from the speaker array 14 to output only the main lobe. Here, the window filter
unit 10 includes a window filter unit 10 a connected to the down sampling unit 9 a, a window
filter unit 10 b connected to the down sampling unit 9 b, a window filter unit 10 c connected to
the down sampling unit 9 c, and The window filter unit 10d is connected to the sampling unit 9d.
[0025]
The band synthesis unit 11 synthesizes voice signals divided for each frequency band. Here, the
voice beam forming units 4 a to 4 e are each provided with n band combining units in order to
output an audio signal to each of the n speakers 15 constituting the speaker array 14. . That is,
the voice beam forming unit 4a is a band combining unit 11-1 to 11-n, the voice beam forming
unit 4b is a band combining unit 11- (n + 1) to 11-2n, and the voice beam forming unit 4c is a
band combining unit 11-. (2n + 1) to 11-3n, the voice beam forming unit 4d includes band
combining units 11- (3n + 1) to 11-4n, and the voice beam forming unit 4e includes band
combining units 11- (4n + 1) to 11-5n. . The band synthesizing units 11-1 to 11-n are connected
to the window filter units 10 (10a to 10d) of the voice beam forming unit 4a. The band
combining units 11- (n + 1) to 11-2n are connected to the window filter units 10 (10a to 10d) of
the voice beam forming unit 4b. The band combining units 11-(2 n + 1) to 11-3 n are connected
to the window filter units 10 (10 a to 10 d) of the voice beam forming unit 4 c. The band
combining units 11- (3n + 1) to 11-4n are connected to the window filter units 10 (10a to 10d)
of the voice beam forming unit 4d. The band combining units 11- (4n + 1) to 11-5n are
connected to the window filter units 10 (10a to 10d) of the voice beam forming unit 4e.
[0026]
The speech synthesis unit 12 synthesizes the speech signals output from the speech beam
forming units 4a to 4e. The speech synthesis unit 12 includes speech synthesis units 12-1 to 12n. The speech synthesis unit 12-1 is connected to the band synthesis units 11-1, 11- (n + 1), 11(2n + 1), 11- (3n + 1) and 11- (4n + 1), and the speech synthesis unit 12-n The band combining
units 11-n, 11-2n, 11-3n, 11-4n, and 11-5n are connected. The speech synthesizers 12-2 to 12(n-1) are also connected to the band synthesizer 11.
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[0027]
The D / A converter 13 converts the digital voice signal having a sampling frequency of 48 kHz
synthesized by the voice synthesis unit 12 into an analog voice signal. Here, the D / A converter
13 includes D / A converters 13-1 to 13-n, and is connected to the voice synthesis units 12-1 to
12-n, respectively.
[0028]
The speaker array 14 includes n speakers 15 (15-1 to 15-n), and is connected to the D / A
converters 13-1 to 13-n, respectively. The speaker array 14 emits an output signal of a power
amplifier (not shown) that amplifies an audio signal output from the D / A converter 13 (13-1 to
13-n) to form an audio beam. Since the speaker array device 1 includes five sound beam forming
units 4a to 4e, the speaker array 14 can output five sound beams.
[0029]
For the speakers 15-1 to 15-n, for example, ones having a diameter of about 1 inch are used,
arranged at intervals of 4 cm in a matrix or a honeycomb as shown in FIG. The size of the
speaker array 14 is, for example, 2 m in total length and height. The speaker array device 1 can
output various types of voices such as human voices and timbres of musical instruments as voice
beams.
[0030]
The operation unit 21 receives various setting inputs made by the user U, such as setting the
output direction of the sound beam and the distance to the focus of the sound beam, and outputs
a signal corresponding to the input to the control unit 23.
[0031]
The display unit 22 displays the content to be transmitted to the user U based on the control
signal output from the control unit 23.
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[0032]
The control unit 23 controls the delay time and the sound signal of the sound signal emitted
from each speaker 15 to form the sound beam based on the setting input such as the output
direction and the focal length of the sound beam received by the operation unit 21. The setting
of the gain is obtained by calculation.
Then, based on the calculation result, the set value of the delay time of the sound emitted from
each speaker 15 of the speaker array 14 is set in the delay control unit 8 and the set value of the
gain of the sound emitted from each speaker 15 Are set in the window filter unit 10.
[0033]
Here, as is well known, speech becomes sharper in directivity as the frequency becomes higher,
and conversely becomes less directive as the frequency is lower, and the generation position and
amount of side lobes differ depending on the band of the sound beam.
Therefore, in the present invention, in the speaker array device 1 as described above, the audio
signal input from the audio input terminal 2 is divided into four bands, for example, low, middle,
high, and low frequencies. The set value of the window function in the window filter unit 10 is
changed for each band. As a result, the occurrence of side lobes can be suppressed for each band,
and all bands can be made to have substantially the same directivity.
[0034]
The speech beam band division is not limited to four, and may be further subdivided. In this case,
the occurrence of side lobes can be further suppressed.
[0035]
Moreover, the speaker array device 1 of the present invention can finely control the directivity of
the sound beam.
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For example, the sound beam can be controlled to focus 30 m from the front of the speaker array
14. In addition, it is possible to move the position of the focal point in the range of 1 to 2 n at
this distance. In order to control the directivity and focal length of the voice beam with such
accuracy, it is necessary to increase the frequency resolution. Therefore, in the present invention,
when the sampling frequency of the A / D converter 3 is 48 kHz, the oversampling unit 7
performs oversampling at a sampling frequency of 192 kHz.
[0036]
Next, an operation of the speaker array device 1 forming the high sound pressure area will be
described. FIG. 3 is a diagram showing an image in which sound is emitted from each speaker to
form a sound beam in the speaker array. FIG. 3 is a perspective view showing a state in which
four sound beams are output from the planar speaker array, and the focus of each sound beam is
made close to form a circular high sound pressure area.
[0037]
As shown in FIG. 3, in the speaker array device 1 of the present invention, a plurality of speakers
15 constituting the speaker array 14 are divided into a plurality of groups (speaker units), and an
audio beam is output for each speaker unit. In addition, the speaker array device 1 directly emits
sound from each speaker 15 of the speaker array 14 without being reflected on a wall surface or
the like, and controls so that the focal points of the sound beams are arranged in close proximity.
This is because the time alignment unit 5 controls the position of the focal point for each sound
beam and the delay control unit 8 adjusts the sound emission timing of the sound emitted from
each speaker 15 to form the sound beam. It is a thing.
[0038]
By controlling in this way, the focal point of the sound beam and its surroundings become a
region with high sound pressure, and the regions with high sound pressure in a band or circular
shape (high sound pressure region) Can be formed.
[0039]
Therefore, by using the speaker array device 1 of the present invention, it is possible to clearly
listen to more listeners than ever before, for example, in a place where there are a plurality of
listeners such as an event hall and the outdoors. it can.
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[0040]
Further, in the speaker array device 1 of the present invention, since the voice is directly emitted
in the space without reflecting the voice on the wall, the voice is not absorbed by the wall or the
voice is diffusely reflected and the energy of the voice is not attenuated. The energy component
in the high sound pressure region can be increased.
[0041]
In the example shown in FIG. 3, in the speaker array device 1, the sound beam forming unit 4e is
stopped, and the sound beam forming units 4a to 4d are operated to output four sound beams.
[0042]
In the speaker array device 1, the number of speakers constituting the speaker array 14 is
increased, and the number of voice beam forming units 4 is increased to increase the number of
focal points of the audio beam, so that the listener can clearly hear the audio. The high sound
pressure area that can be made can be further broadened.
Further, in the sound beam forming unit 4, it is possible to further expand the high sound
pressure area by increasing the number of focal points of the sound beam by outputting a
plurality of sounds from each speaker.
[0043]
FIG. 4 is an image view different from FIG. 3 of the sound beam output from each speaker of the
speaker array.
FIG. 4 is a perspective view showing a state in which five sound beams are output from the
planar speaker array to bring the focus of each sound beam close to form a circular high sound
pressure area.
[0044]
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When the control unit 23 of the speaker array device 1 is set to widen the high sound pressure
area by the user, the control unit 23 controls the delay control unit 8 to emit two or more sounds
from the plurality of speakers 15 of the speaker array 14 Control to increase the number of
outputs of the sound beam.
Then, the arrangement is set such that the focal points of the respective audio beams are in close
proximity.
Thereby, as shown in FIG. 4, at least a part of the speakers 15 emit a plurality of sounds in order
to form a plurality of sound beams, thereby increasing the number of speakers 15 constituting
the speaker array 14 Instead, multiple voice beams can be output. Therefore, the high sound
pressure area can be expanded.
[0045]
When a plurality of voices are emitted from one speaker 15, it is necessary to adjust the output
timing and the gain so that the voices do not interfere and attenuate.
[0046]
Next, in the speaker array device 1 of the present invention, by operating the operation unit 21,
the positions of the respective focal points of the sound beam can be simultaneously moved.
In this case, when the control unit 23 detects that the operation unit 21 receives an operation to
move the focal point of the sound beam, the control unit 23 receives information from the
speakers 15 based on information such as the movement distance and movement direction input
by the operation Calculate the gain of the sound to be emitted and the emission timing. Then, the
control unit 23 outputs a control signal to the time alignment unit 5 and the delay control units
8a to 8d of the audio beam forming units 4a to 4e to move the focal positions of the plurality of
audio beams.
[0047]
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In this way, since the focus of each sound beam can be moved, the high sound pressure area
formed by the focus of each sound beam can be moved. Thus, the atmosphere can be boosted by
moving the belt-like light beam in, for example, a concert hall or the like, but by moving the belt
of the audio beam as described above, a sense of passing (moving) the sound can be realized.
Since it can be given to the listener, the atmosphere can be further enhanced.
[0048]
It should be noted that which speaker 15 is used to output the sound beam and how many
speakers 15 are used are the data preset in the control unit 23 and the place where the high
sound pressure area is formed from the speaker array 14 It is determined by the result of
calculation based on the distance, direction, etc. of
[0049]
As described above, the speaker array device of the present invention divides each speaker
constituting the speaker array into a plurality of speaker units, delays the sound emitted from
each speaker for each speaker unit, and outputs an audio beam. By adjusting (delaying) the
output timing of the sound beam output from each speaker unit, it is possible to focus each of the
plurality of sound beams and to arrange each focus in a band.
Thus, it is possible to form a band-like area with high sound pressure, so that a plurality of
listeners who are present in this area can hear sounds clearly.
[0050]
Further, in the speaker array device of the present invention, since each focal point can be
moved, by controlling the focal point of each sound beam to move, it is possible to move a high
sound pressure area. Thus, the atmosphere can be boosted by moving the belt-like light beam in,
for example, a concert hall or the like, but by moving the belt of the sound beam as described
above, the listener is given a sense of passing sound. Because you can, you can further enhance
the atmosphere.
[0051]
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It is a block diagram showing a schematic structure of a speaker array device concerning an
embodiment of the present invention. It is a block diagram of a speaker array. It is an image
figure of the audio | voice beam output from each speaker of a speaker array. It is an image
figure different from FIG. 3 of the audio | voice beam output from each speaker of a speaker
array.
Explanation of sign
[0052]
1-Speaker Array Device 2-Voice Input Terminal 3-A / D Converter 4, 4a-4e Voice Beam Forming
Unit 5-Time Alignment Unit 6, 6a 6b 6c 6d Band Divider 7, 7a 7b 7c, 7d-Oversampling unit 8, 8a,
8b, 8c, 8d-Delay control unit 9, 9a, 9b, 9c, 9d-Downsampling unit 10, 10a, 10b, 10c, 10dWindow filter unit 11, 11- 1 to 11-n-band synthesis unit 12, 12-1 to 12-n-voice synthesis unit
13, 13-1 to 13-nD / A converter 14-speaker array 15-1 to 15-n-speaker 21 -Operation unit 22Display unit 23-Control unit
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