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JP2008178000

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2008178000
An object of the present invention is to provide a sound generator capable of reproducing a
sound with a sense of space without localization of a sound source in the direction of a speaker.
A sound processing apparatus performs delay processing and signal processing to increase /
decrease amplitude in a signal processing unit on an audio signal, and an acoustic beam emitted
based on the signal processed audio signal is a wall surface of a room By causing the sound to be
reflected to the sound receiving position and reaching a plurality of sound receiving positions,
sound emission can be performed such that sound having a delay effect can be heard from
various directions of the wall surface. As a result, the sound source can not be localized in the
direction of the speaker, and a sound with a sense of space can be reproduced such that the
sound is emitted from the entire room. [Selected figure] Figure 1
Sound generator
[0001]
The present invention relates to a technology for reproducing a sound with a sense of space.
[0002]
As a method of adding reverberation in a sound field support system (room reverberation adding
apparatus), there is a method of performing signal processing on an audio signal using a FIR
(Finite Impulse Response) filter or an IIR (Infinite Impulse Response) filter. .
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In addition, as described in Patent Document 1, speakers are arranged at various places in a
room, or virtual speakers are generated, and an audio signal is appropriately delayed and the like
to emit sound, thereby providing a desired sense of space. There is a method to create the sound
field of JP, 2001-016698, A
[0003]
However, when speakers are disposed at various places in a room as in Patent Document 1, the
point at which a reproduced sound with a sense of space is obtained by the effects of stereo and
sound conditioning becomes a limited area. In addition, especially near a specific speaker, the
sound image is localized to the speaker, and for example, with a sound field support device or the
like, it was recognized as a sound from the speaker and natural reverberation could not be
applied.
[0004]
The present invention has been made in view of the above-described circumstances, and an
object of the present invention is to provide a sound generating device capable of reproducing a
sound having a sense of space without localization of a sound source in the direction of a
speaker.
[0005]
In order to solve the above-mentioned problems, the present invention relates to an acoustic
generator installed in a room, which includes room shape information indicating the shape of the
room, and reflectance information indicating the reflectance of sound on the wall of the room.
Memory storing room information having installation position information indicating a position
where the sound generation device is installed and an installation direction, and sound reception
position information indicating a sound reception position to hear a sound emitted from the
sound generation device From the signal processing means, signal processing means having
means, delay means for delaying the set delay time with respect to the input signal, and
amplification means for amplifying the amplification factor to be set; Pointing control means for
controlling the pointing state based on the set point information and emitting means for emitting
an output delayed signal and amplified signal as an acoustic beam having a predetermined
pointing direction and a pointing angle When A plurality of sound emitting systems having
correction means for determining the delay time set in the delay means and the amplification
factor set in the amplification means based on the room information and the directional
information, There is provided an acoustic generator characterized in that the directional
information of the sound emission system is set to be different from that of the other sound
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emission systems.
[0006]
In another preferred embodiment, at least one of directivity information set in the directivity
control means, a delay time set in the delay means, or an amplification factor set in the
amplification means with the passage of time. It may further comprise changing means for
changing.
[0007]
Further, in another preferred embodiment, the signal processing means further includes a
reverberation applying means for outputting a signal obtained by adding a reverberation effect to
an input signal, and an output signal from the signal processing means is delayed and amplified.
And the signal may be reverberated by the reverberation unit.
[0008]
According to the present invention, it is possible to provide a sound generating device capable of
reproducing a sound with a sense of space without localization of a sound source in the direction
of the speaker.
[0009]
Hereinafter, embodiments of the present invention will be described.
[0010]
Embodiment FIG. 1 is a block diagram showing a configuration of a sound generating device 1
according to an embodiment of the present invention, and FIG. 2 is a perspective view showing
an appearance of the sound generating device 1.
The sound generator 1 comprises an array speaker 2 having 36 speakers 2-1, 2-2,..., 2-36, and as
shown in FIG. .., 2 to 36 are arranged in sixs in the vertical and horizontal directions.
The amplifiers 3-1, 3-2,..., 3-36 amplify the input signals based on the control from the control
unit 11, and the speakers 2-1, 2-2,. · · · · From 2-36.
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The amplification unit 3 is configured by the amplifiers 3-1, 3-2,..., 3-36.
[0011]
The directivity control unit 4 includes directivity control circuits 4-1, 4-2,.
The directivity control circuits 4-1, 4-2,..., 4-36 control the delay amount and the volume of the
input signal based on the control from the control unit 11, and the amplifiers connected to the
respective signals are controlled. 3-1, 3-2,..., 3-36.
Here, when output signals of a plurality of multipliers are input to one directivity control circuit
as described later, the delay amount of each output signal is calculated based on control from the
control unit 11. Control the volume.
[0012]
The signal processing unit 5 includes delay circuits (delay units) 51-1, 51-2, ..., 51-n, and
multipliers (amplification units) 52-1, 52-2, ..., 52-n, And the number of sets of delay circuits and
multipliers (signal processing means) are set based on the control from the control unit 11.
In FIG. 1, the number of delay circuit / multiplier sets is described as four, that is, n = 4. The
delay circuits 51-1, 51-2,..., 51-n delay the signals input from the signal input unit 6 based on the
delay time set by the control unit 11. Are output to the multipliers 52-1, 52-2,..., 52-n. The
multipliers 52-1, 52-2,..., 52-n output signals whose amplitudes have been increased or
decreased based on the amplification factor set by the control unit 11 with respect to the input
signals.
[0013]
The connector 53 connects a plurality of directional control circuits (directional control means)
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to each multiplier, and directs the signals output from the multipliers 52-1, 52-2, ..., 52-n to
directional control. It distributes to the circuits 4-1, 4-2, ..., 4-36. By connecting in this manner,
the signals output from one multiplier are transmitted through the directional control circuits 41, 4-2,..., 4-36 to the respective speakers (sound output means). Sound controlled to be directed
from 2-1, 2-2, ..., 2-36 (hereinafter referred to as an acoustic beam). Released as). For example, in
the directivity control circuits 4-1, 4-2,..., 4-36, the delay amount and the volume of the signal
output from the multiplier 52-1 are controlled respectively, and the speakers 2-1, 2 Sound
emitted from the multipliers 52-1 to -36, and the sound output from the multiplier 52-1 indicates
the directivity direction and the directivity angle (the spread of the directivity of the acoustic
beam). Emitted as a beam. Similarly, the signal output from the multiplier 52-2 is emitted as an
acoustic beam of another pointing state.
[0014]
The storage unit 12 includes information on the shape of the room in which the sound
generation device 1 is installed (room shape information), information on the reflectance of
sound on the wall of the room (reflectance information), and the position at which the sound
generation device 1 is installed. The information on the coordinates of the position (the
installation position information) and the information on the coordinates of the position where
the sound emitted from the sound generation device 1 is to be heard (hereinafter referred to as a
sound reception position) (sound reception position information) is stored. It has a room
information storage area. The information is input through the information input unit 13 and
stored in the storage unit 12 when the sound generator 1 is installed in a room. The storage unit
12 also has a program storage area in which a program for the control unit 11 to control the
sound generation device 1 is stored.
[0015]
The operation unit 14 has an operation element for setting the volume of the sound emitted from
the sound generation device 1 and an operation element for setting the sense of space, and in
response to a request from the control unit 11, information of the set value It is output to the
control unit 11.
[0016]
The control unit 11 reads out a program from the program storage area of the storage unit 12
and executes the program, and controls the amplification unit 3, the directivity control unit 4,
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and the signal processing unit 5.
Hereinafter, control of the control unit 11 will be described. First, the control unit 11 acquires
information on the volume set by the operation unit 14, and based on the information on the
volume, the control units 11-3, 3-2,. Control the amount of amplification.
[0017]
In addition, when the control unit 11 is set to increase the sense of space based on the
information of sense of space set by the operation unit 14, the number of acoustic beams, that is,
the number of sets of delay circuits and multipliers. To increase the number of delay circuit /
multiplier pairs and control the signal processing unit 5. Then, the directivity information
indicating the directivity state of the acoustic beam, the delay time indicating the time to delay
the audio signal, and the amplification factor indicating the ratio of increasing or decreasing the
amplitude of the audio signal Generate only the number. In the present embodiment, the
amplification factor is generated to decrease exponentially according to the set delay time. Also,
the pointing information is generated such that the pointing states of the respective acoustic
beams are all different.
[0018]
Then, the control unit 11 controls each of the plurality of directivity control circuits to control
the delay amount and the volume of the signal input from the multiplier based on the generated
directivity information. At this time, a plurality of directivity control circuits are controlled so that
not only the directivity direction of the acoustic beam but also the directivity angle can be
controlled. The plurality of directional control circuits connected to the other multipliers are
similarly controlled, and the acoustic beams of the number of pairs of delay circuits and
multipliers are emitted in different directional states.
[0019]
Next, control of delay circuits 51-1, 51-2,..., 51-n and multipliers 52-1, 52-2,. Will be explained.
The control unit 11 delays the delay circuits 51-1, 51-2,..., 51-n so that the generated acoustic
beam reaches the delay time and volume generated by the control unit 11 at the sound receiving
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position. A time (hereinafter referred to as a correction delay time) is set, and an amplification
factor (hereinafter referred to as a correction amplification factor) is set (a correction means) in
the multipliers 52-1, 52-2, ..., 52-n. Here, the correction delay time set in the delay circuit 51-1 is
the delay time generated by the control unit 11, the directivity information that is paired with the
delay time, room shape information, sound reception position information, and the like. The
correction is made based on the time from the sound generator 1 being emitted from the sound
generator 1 to the sound receiving position, which is calculated from the installation position
information. Then, the correction amplification factor set in the multiplier 52-1 is directivity
information in which the amplification factor generated by the control unit 11 is paired with the
amplification factor, room shape information, sound reception position information, and the like.
It correct | amends based on attenuation | damping of the intensity | strength of the acoustic
beam computed from installation position information and reflectance information. Similarly, the
control unit 11 sets the correction delay time and the correction amplification factor for the
other delay circuits and multipliers. The delay time and the amplification factor generated by the
control unit 11 may be set as they are without performing this correction.
[0020]
Next, the operation of the sound generator 1 installed in the room 100 will be described. FIG. 3 is
a top view of the room 100. The sound generator 1 is installed near the wall 100a so that the
array speaker 2 faces the sound receiving area 110. As shown in FIG. Here, in order to simplify
the description, the sound receiving area 110 is representatively referred to as a sound receiving
position 111 hereinafter.
[0021]
First, the information indicating the shape of the room 100 such as CAD data, the reflectance of
sound on the wall, the sound receiving position 111, and the coordinates at which the sound
generating device 1 is installed, and the direction are stored via the information input unit 13.
The part 12 is stored in the room information storage area. Then, the operation unit 14 is
operated to set the volume and the sense of space.
[0022]
The control unit 11 reads a program from the program storage area of the storage unit 12 and
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executes the program. Then, the amplification unit 3 is controlled according to the information of
the sound volume set by the operation unit 14, and the directivity control unit 4 and the signal
processing unit 5 are controlled according to the information of the set space feeling. Here, it is
assumed that the number of pairs of delay circuits and multipliers determined in accordance with
the set information on the feeling of space is four, and the sound generator 1 emits four sound
beams sa, sb, sc, sd. It will be described below as possible. In the present embodiment, the
number of delay circuit / multiplier pairs is four for simplification of the description, but may be
about 30 or more, and may be two or more. Any number may be used.
[0023]
The control unit 11 has four sets of delay circuits and multipliers, that is, delay circuits 51-1, 512, 51-3, 51, as shown in FIG. The signal processing unit 5 is controlled to have the -4 multipliers
52-1, 52-2, 52-3 and 52-4. And the connector 53 connects each multiplier 52-1, 52-2, 52-3, 524 with each directivity control circuit 4-1, 4-2, ..., 4-36. As a result, the signal output from the
multiplier 52-1 is controlled in delay amount and volume by each directional control circuit, and
emitted as an acoustic beam sa from the speakers 2-1, 2-2,. Be done. Similarly, the signal output
from the multiplier 52-2 is emitted as an acoustic beam sb, the signal output from the multiplier
52-3 is emitted as an acoustic beam sc, and the signal output from the multiplier 52-4 is emitted
as an acoustic beam sb Be done.
[0024]
Next, the control unit 11 generates four sets of the delay time, the amplification factor, and the
pointing information, and generates them, for example, as shown in FIG. Here, (ta, pa, da) in FIG.
4 indicate that the delay time is ta, the amplification factor is pa, and the directivity information
is da. The directional information da, db, dc, dd indicate different directional states, and
correspond to the acoustic beams sa, sb, sc, sd. In the example shown in FIG. 4, the amplification
factor is exponentially reduced according to the delay time of the set. The delay time, the
amplification factor, and the pointing information may be randomly generated, may be generated
by a predetermined algorithm, or may be set in advance.
[0025]
Subsequently, the control unit 11 corrects the corrected delay time obtained by correcting each
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of the generated delay times to each of the generated amplification factors in the delay circuits
51-1, 51-2, 51-3, and 51-4. The corrected amplification factors which have been set are set in
the multipliers 52-1, 52-2, 52-3 and 52-4. Here, the correction delay time set in the delay circuit
51-1 corresponding to the acoustic beam sa will be described. Assuming that the path length of
the acoustic beam sa is La and the sound velocity is v, a time ta ′ from when the acoustic beam
sa is emitted from the acoustic generator 1 to reach the sound receiving position 111 is La / v.
Therefore, by emitting sound in advance only for this time, it is possible to correct the time lag
related to the path length of the acoustic beam sa. Then, by adding the correction time ts to the
whole, the control unit 11 sets ta−ta ′ + ts in the delay circuit 51-1 as the correction delay
time. Similarly, tb-tb '+ ts is set in the delay circuit 51-2, tc-tc' + ts in the delay circuit 51-3, and
td-td '+ ts in the delay circuit 51-4 as the correction delay time. Here, the correction time ts for
the whole is set such that all correction delay times have positive values.
[0026]
Subsequently, the corrected amplification factor set in the multiplier 52-1 connected to the delay
circuit 51-1 will be described. A ratio of the volume of the sound heard at the sound receiving
position 111 to the volume of the sound emitted from the sound generation device 1 is taken as
a damping rate pa '. Here, the attenuation factor pa 'is calculated from the attenuation of the
sound on the wall, the attenuation based on the path length and the directivity angle of the
acoustic beam sa. By considering the attenuation rate pa 'in advance, it is possible to correct the
volume shift relating to the attenuation. Then, the control unit 11 sets pa / pa 'as the correction
amplification factor in the multiplier 52-1. Similarly, the multiplier 52-2 sets pb / pb ', the
multiplier 52-3 sets pc / pc', and the multiplier 52-4 sets pd / pd 'as a correction amplification
factor.
[0027]
Then, when an audio signal is input from the signal input unit 6, the delay circuit 51-1 performs
delay processing on the input audio signal based on the corrected delay time ta-ta '+ ts, and the
multiplier 52- 1 changes the amplitude based on the corrected amplification factor pa / pa '. The
directivity control circuits 4-1, 4-2,..., 4-36 connected to the multiplier 52-1 by the connector 53
are outputted from the multiplier 52-1 based on the directivity information da. The amount of
delay and the volume of the signal are controlled, and the sound beam sa is emitted by emitting
sound from the speakers 2-1, 2-2,. The acoustic beams sb, sc, sd are also emitted in the same
manner as the acoustic beam sa. Then, for example, as shown in FIG. 3, the acoustic beam sa is
emitted as an alternate long and short dash line in the figure, and the acoustic beam sb is emitted
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as an alternate long and two short dash line in FIG. .
[0028]
In this manner, the sound generation device 1 performs delay processing and signal processing
to increase / decrease the amplitude in the signal processing unit 5 on the audio signal, and the
room 100 emits the acoustic beam emitted based on the signal-processed audio signal. By
reflecting the light on the wall surface of the plurality of sound reception positions 111, sound
emission with different delay times and volume can be performed such that sounds having
different delay times and volume can be heard from various directions of the wall surface. As a
result, the sound source can not be localized in the direction of the speaker, and a sound with a
sense of space can be reproduced such that the sound is emitted from the entire room.
[0029]
Although the embodiments of the present invention have been described above, the present
invention can be implemented in various aspects as follows.
[0030]
<Modification 1> In the embodiment, only one sound generation device 1 is used, but a plurality
of sound generation devices 1 may be used and installed at various places in a room.
In this case, the audio signal input from the signal input unit 6 of each sound generation device 1
may be supplied from the same source as the audio signal of the other sound generation device
1. Further, the array speaker 2 may be installed at various places in a room so that only one
sound generator 1 is provided and the sound generator 1 has a plurality of array speakers 2. In
this case, the position where the array speaker 2 is installed may be stored in the room
information storage area of the storage unit 12 as a plurality of installation position information.
In this way, the effects of the embodiment can be further enhanced.
[0031]
<Modification 2> In the embodiment, the amplification factor is exponentially decreased with
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respect to the delay time. However, the amplification factor may be generated independently of
the delay time. In this way, a more complex sense of space can be obtained.
[0032]
<Modification 3> In the embodiment, although the sound receiving position 111 is described as
one place, the sound receiving area 110 may have an effect on a certain range. In this case, the
pointing state may be changed by, for example, expanding the pointing angles of the respective
acoustic beams sa, sb, sc, and sd. In this way, at various positions of the room 100, the same
effects as those of the embodiment can be obtained.
[0033]
<Modification 4> In the embodiment, the directivity state of the acoustic beams sa, sb, sc, sd, the
delay time and the amplification factor are fixed during the emission, but the directivity state is
timed by a predetermined algorithm It may be changed. In this case, the control unit 11 may
control the directivity control unit 4 according to the time change. The correction delay time or
the correction amplification factor may be changed in conjunction with a change in the pointing
state. Also, the delay time and amplification factor may be changed according to time. In this
case, the control unit 11 may control the signal processing unit 5. Here, the predetermined
algorithm may be one that changes continuously with respect to the progress of time, or one that
changes as the certain time elapses. In this way, the binaural correlation degree decreases, and
the effect of giving a sense of space can be improved. Note that the delay time and the
amplification factor may be independently temporally changed without being interlocked.
[0034]
Modified Example 5 In the embodiment, each acoustic beam is delayed and emitted based on one
delay time, but may be emitted based on a plurality of delay times. In this case, the connector 53
may combine the signals output from the plurality of sets of delay circuits and multipliers into
one signal and connect the signals so as to be distributed to the plurality of directional control
circuits. Further, as shown in FIG. 5, FIR filters (reversing means) 54-1, 54-2, 54- between the
multipliers 52-1, 52-2,. 3 and 54-4 may be connected, and the input signal may be subjected to
signal processing so as to apply a delay effect, a reverberation effect, or the like, to impart a
reverberation effect to the audio signal. At this time, the delay effects of the respective FIR filters
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may be set so as to reduce the correlation with each other. In this way, reverberation is greatly
added, and the sense of space can be improved. The FIR filter may be provided between the
signal input unit 6 and the delay unit. Further, the filter is not limited to the FIR filter, and any
filter such as an IIR filter or another filter may be used as long as it imparts reverberation.
Furthermore, the reverberation effect provided by each FIR filter may be different effects (for
example, strength, reverberation time, etc.).
[0035]
<Modification 6> In the embodiment, the directivity direction of the acoustic beams sa, sb, sc, sd
is not particularly limited, but the directivity direction is limited so that the sound does not reach
the sound receiving position 111 directly. It is also good. In this case, all directional directions
may be limited to be directed to the wall surface of the room 100, or the sound generator 1 may
be installed at a high position in the room so that the person receiving the sound beam at the
sound receiving position 111 The acoustic beam may be emitted to the wall surface facing the
wall surface 100 a while passing overhead. In this way, localization to the speaker becomes
difficult and a sense of space can be obtained. Alternatively, at least one of the acoustic beams
may reach the sound receiving position 111 directly without being reflected by the wall surface.
In this way, it is possible to give a sense of space while listening to the sound clearly.
[0036]
<Modification 7> In the embodiment, the speed of sound is determined as v, but as shown in FIG.
6, a temperature sensor 15 is provided to detect the ambient temperature, and the temperature
correction is performed on the speed of sound v It is also good. In this case, the control unit 11
may obtain the temperature detected by the temperature sensor 15 and correct the temperature
based on the temperature information. For example, when the detected temperature is t (° C.), it
may be calculated and corrected as 331.5 + 0.61 t (m / s). The temperature sensor 15 may be
installed at the same place as the sound generator 1 or may be installed at a place away from the
sound generator 1 such as an audience area, and the detected temperature information may be
wired or wireless It may be transmitted to the control unit 11 or the like.
[0037]
<Modification 8> In the embodiment, the directivity state of the acoustic beam is controlled by
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controlling the delay and the amplitude of the emitted sound by using the array speaker 2.
However, as shown in FIG. The narrow directional horn speakers 20-1, 20-2,..., 20-8 may be used.
In this case, the directional control unit 4 is not used, and the direction control function is
provided to the horn speakers 20-1, 20-2, ..., 20-8, and the control unit 11 generates the
directional information based on the directional information. The direction of the horn speaker
may be controlled. In this way, the number of horn speakers, in the case of this modification,
eight acoustic beams can be emitted. If the number of sets of delay circuits and multipliers is less
than 8, the connector 53 may be connected so that the signal from one multiplier is emitted from
a plurality of horn speakers. Also by this, the effects of the embodiment can be obtained.
[0038]
<Modification 9> In the embodiment, the audio signal input from the signal input unit 6 is a
monaural signal, but may be a stereo signal having L and R channels. In such a case, as shown in
FIG. 8, signal input units 6-L and 6-R may be provided, and the signal processing unit 5 may be
divided into L and R for use. In this manner, a plurality of acoustic beams are allocated to each of
L and R, so that an acoustic beam based on the L signal arrives from the wall surface on the left
side from the sound receiving position 111 toward the sound generating device 1 And an
acoustic beam based on the R signal may arrive from the right wall. In this way, a sense of space
can be given without losing the original stereo effect.
[0039]
<Modification 10> embodiment, the signal processed audio signals at one delay circuit and
multiplier, as had been released as a single acoustic beam is emitted from the two acoustic beams
It is also good. In this case, the control unit 11 generates the directivity information of 2, and the
directivity information of the 2 with respect to the signal input to each of the directivity control
circuits 4-1, 4-2,. The control of the delay amount and the volume may be performed based on
and two acoustic beams may be emitted. Note that if more directional information is generated,
the same audio signal can be emitted as a plurality of acoustic beams.
[0040]
<Modification 11> embodiment, each of the four acoustic beams, all of the speakers 2-1, 2-2, ...,
had been released from 2-36, to use for each acoustic beam The area of the speaker may be
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divided and emitted. In this case, the following configuration may be adopted. First, the control
unit 11 controls the connector 53, and nine directivity control circuits 4-1, 4-2, 4-3, 4
corresponding to the multiplier 52-1 and the speaker surrounded by the broken line a in FIG. -7,
4-8, 4-9, 4-13, 4-14, 4-15 are connected. Thus, the signal output from the multiplier 52-1, the
directivity control circuit, a controlled amount of delay and volume on the basis of the directional
information da, corresponding speaker 2-1, 2-2, 2-3 and 2 Sound emitted from -7, 2-8, 2-9, 2-13,
2-14, 2-15 is emitted as an acoustic beam sa. Similarly, the multiplier 52-2 dashed b, the
multiplier 52-3 dashed c, the multiplier 52-4 is connected to the directivity control circuits
corresponding to the speaker surrounded by broken lines d, each from the corresponding
speaker An acoustic beam is emitted. Also in this case, the effects of the embodiment can be
obtained, and the processing of the pointing control circuit can be reduced.
[0041]
<Modification 12> embodiment, the directivity control circuit 4-1, 4-2, ..., and the control of the
directivity state of acoustic beam has been performed by controlling the delay amount and
volume of 4-36 The amplitude and phase may be controlled by an FIR filter.
[0042]
It is a block diagram showing composition of a sound generator concerning an embodiment.
It is a perspective view which shows the external appearance of the sound generator which
concerns on embodiment. It is a top view of the room in which the sound generator concerning
an embodiment is arranged. It is explanatory drawing which shows the delay time and
magnification which were produced | generated by the control part. FIG. 18 is a block diagram
showing a configuration of a sound generation device according to a fifth modification. FIG. 18 is
a block diagram showing a configuration of a sound generation device according to Modification
7. FIG. 18 is a block diagram showing a configuration of a sound generation device according to
a modification 8; FIG. 21 is a block diagram showing a configuration of a sound generation
device according to a modification 9;
Explanation of sign
[0043]
DESCRIPTION OF SYMBOLS 1 ... Sound generator, 2 ... Array speaker, 2-1, 2-2, ..., 2-36 ... Speaker,
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3 ... Amplifier part, 3-1, 3-2, ..., 3-36 ... Amplifier 4: Directional control unit 4-1, 4-2: 4-36:
Directional control circuit 5. Signal processing unit 6, 6-L 6, 6R: Signal input unit 11 Control unit,
12: storage unit, 13: information input unit, 14: operation unit, 15: temperature sensor, 20-1, 202, ..., 20-8: horn speaker, 51-1, 51-2 , 51-3, 51-4 ... delay circuit, 52-1, 52-2, 52-3, 52-4 ...
multiplier, 53 ... connector 54-1, 54-2, 54-3, 54- 4 ... FIR filter
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