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JP2008067000

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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 JP2008067000
The present invention provides a sound generating device capable of controlling a spatial
impression showing a clearness and a spreading feeling of sound. SOLUTION: A shape of a wall
surface of a used hole stored in advance in a storage unit 3 so that a sound generation device 1
can hear a sound according to a set clarity and a sense of spread at an audience position. Based
on the information on the audience position, the position where the sound generator 1 is
installed, and the set value output from the operation unit 5, the control unit 6 uses D, LF as
indicators of the clarity and the spread feeling, and the delay time The amplification factor is
calculated, the audio signal is delayed in the signal processing unit 8, amplified in the amplifiers
7-1 and 7-2, and the main acoustic beam is directed from the speakers 2-1 and 2-2 toward the
audience position in the side wall direction By emitting the side acoustic beam, the intelligibility
and the sense of spread of the sound at the audience position 111 can be easily controlled.
[Selected figure] Figure 1
Sound generator
[0001]
The present invention relates to a technology for controlling the spread of a sound field in a hall
or the like.
[0002]
In acoustic facilities such as halls, with the diversification of applications, reverberant sounds
were added to give acoustics that reduce reverberation in order to clearly convey voices such as
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speech, and to give a sense of loudness in concerts etc. Various acoustic characteristics such as
acoustic characteristics are required.
Although it is possible to cope with this control of the acoustic characteristics by moving a
structure such as a wall that constitutes a hole, this is a large-scale device and the control thereof
is difficult. Therefore, in order to control the acoustic characteristics easily, there is a method of
controlling an audio signal to be emitted by performing signal processing using an FIR (Finite
Impulse Response) filter. (For example, Patent Document 1) JP-A-6-149276
[0003]
However, in the invention disclosed in Patent Document 1, it is necessary to place a plurality of
microphones at each place of the hole, which takes time for installation. In addition, although
there is a disclosure about emitting an early reflection sound with a tone close to nature, a means
for freely setting the sound transmission mode is not disclosed.
[0004]
The present invention has been made in view of the above-described circumstances, and a single
speaker system emits sound separately in the direction of the audience and in the direction of the
side wall such as a hole, and changes the delay and volume of each sound. An object of the
present invention is to provide a sound generation device capable of controlling the clarity of
sound and the sense of sound spread.
[0005]
In order to solve the above-mentioned problems, the present invention provides, in a sound
generating device for generating sound, wall surface information indicating a shape of a wall
surface in a region having at least one wall surface, and audience region information indicating
an audience region within the region. And storage means having installation position information
indicating the position of the sound generation device in the area, parameter setting means for
setting a value of a parameter indicating how to feel sound in the audience area, and the wall
surface information. Reading means for reading the audience area information and the
installation position information from the storage means, the first sound emission path for
emitting the sound directly to the audience area, and the wall surface reflected one or more times
by the audience Sound emission path setting means for setting a second sound emission path for
sound emission to the area, and a first delay time and a first delay time when the audio signal is
emitted using the first sound emission path Delay / amplification factor determining means for
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determining a second delay time and a second amplification factor when the width ratio, the
audio signal is emitted using the second emission path, and delay / amplification factor
determination means Signal processing means for delaying the audio signal based on the first
and second delay times determined to generate first and second signals, and the first means
determined by the delay / amplification factor determining means Amplifying means for
amplifying the first and second signals based on a second amplification factor to generate first
and second amplified signals, and sound based on the first amplified signal. And a second sound
emitting means for emitting a sound based on the second amplified signal toward the second
sound emission path. The delay / amplification factor determining unit may include the wall
surface information read by the reading unit and the audience area. The first and second delay
times and the first and second delay times such that the arrival mode of the sound wave in the
audience area corresponds to the parameter set by the parameter setting means based on the
information and the installation position information. There is provided an acoustic generator
characterized in that an amplification factor of 2 is determined.
[0006]
Further, in another preferred embodiment, when the impulses are generated from the first and
second sound emitting means, the parameters include all acoustic energy reaching the audience
area and sound reaching a first predetermined time. The delay / amplification factor determining
means may determine the first and second delay times and the first and second amplification
factors in accordance with the ratio.
[0007]
Further, in another preferred embodiment, the parameter is a third predetermined sound energy
which reaches the audience area for a second predetermined time when impulses are generated
from the first and second sound emitting means. The delay / amplification factor determining
means is a value representing a ratio to the acoustic energy reached through reflection of the
wall in time, and the first and second delay times and the first and second delay times
corresponding to the ratio. A second amplification factor may be determined.
[0008]
Further, in another preferable aspect, the first and second sound emitting means are array
speakers having a plurality of speakers, and the sound emission path setting means controls the
sound emission from the speakers so as to control the sound emission from the speakers. The
first and second sound emission paths may be set.
[0009]
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3
According to the present invention, a single speaker system emits sound separately in the
direction of the audience and in the direction of the side wall such as a hole, and changes the
delay and volume of each sound to show the clarity and the sense of loudness of the sound. An
acoustic generator capable of controlling an impression can be provided.
[0010]
Hereinafter, an embodiment of the present invention will be described.
[0011]
Embodiment FIG. 1 is a block diagram showing a configuration of a sound generating device 1
according to an embodiment of the present invention.
First, the configuration of the sound generator 1 installed in the hall will be described.
The loudspeaker 2-1 and the two loudspeakers 2-2 are narrow directivity horn loudspeakers
whose directivity direction can be changed by changing the orientation of the loudspeakers, and
the loudspeaker 2-1 is In the audience area of the hall, the two speakers 2-2 emit sound to the
wall surfaces on both sides of the hall (in the audience area, the wall surfaces present to the left
and right in the installation direction of the sound generator 1, hereinafter referred to as side
walls) As such, the orientation of the loudspeakers is controlled.
Hereinafter, the sound emitted from the speaker 2-1 is referred to as a main acoustic beam, and
the sound emitted from the speaker 2-2 is referred to as a side acoustic beam.
[0012]
The storage unit (storage means) 3 listens to the information (wall surface information) of the
shape of the wall surface of the hole where the sound generator 1 is installed, which is input
from the information input unit 4, and the sound emitted from the sound generator 1 in the hole.
Environment of the environment where the sound generator 1 is installed, such as information of
the audience area (audience area information) indicating the region, information of the position
(coordinates, orientation of the sound generator 1) where the sound generator 1 is installed
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(installation position information) It has a room information storage area for storing information.
Here, the wall surface information indicates the shapes of all the wall surfaces forming the hole,
but it is sufficient if at least information on the shape of the wall surface of the side wall is
included.
[0013]
The operation unit (parameter setting means) 5 has a volume for setting the clarity and the sense
of spread of the sound as a parameter indicating how to feel the sound in the audience area, and
outputs each set value to the control unit 6.
The control unit 6 reads and executes a program stored in a predetermined area of the storage
unit 3 to obtain wall surface information read out from the room information storage area of the
storage unit 3, audience area information, and installation position information. Based on the
setting value output from the operation unit 5, the delay time of the main acoustic beam and the
side acoustic beam and the amplification factor for determining the volume are calculated.
For example, D (definition) 50 and LF (early lateral energy fraction) are used as indices of
intelligibility and sense of spread, respectively, and the control unit 6 increases D50 to improve
the sense of intelligibility, and increases sense of spread. In order to increase LF, the delay times
and amplification factors of the main and side acoustic beams are calculated.
Then, a delay control signal indicating the calculated delay time is output to the signal processing
unit 8, and the amplifiers 7-1 and 7-2 are controlled so as to obtain the calculated amplification
factor.
[0014]
Here, D50 and LF will be described. D50 is expressed by the equation shown in Equation 1, and
is the ratio of the acoustic energy of the impulse response up to the initial 50 ms of the impulse
response to the total acoustic energy of the impulse response at a predetermined position (in the
present embodiment, the audience area) It is a value that is considered to be correlated with the
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clarity. Then, if D50 is increased by causing the acoustic energy to reach a predetermined
position by 50 ms at the initial stage, sound clarity can be improved.
[0015]
[0016]
In addition, LF is expressed by a mathematical expression shown in Equation 2, and the side of
the impulse response from 5 ms to 80 ms to the acoustic energy of the impulse response up to
the initial 80 ms at the predetermined position (in the present embodiment, the audience area). It
is the ratio of the sound energy coming from, and is a value that is considered to be correlated
with the sense of the sound spread.
Then, if the LF is increased by causing a large amount of acoustic energy (in this embodiment,
the acoustic energy of the side acoustic beam) coming from the side between 5 ms and 80 ms to
a predetermined position, sound can be generated. Sense of spread can be increased.
[0017]
[0018]
Here, p (t) described in Equation 1 and Equation 2 indicates an impulse response from all
directions, and pL (t) described in Equation 2 indicates an impulse response from the side.
[0019]
Furthermore, the control unit 6 causes the direction control unit 10 to use the loudspeaker 2-1
as the audience area of the hall based on the wall surface information read from the room
information storage area of the storage unit 3, the audience area information, and the installation
position information. The pointing direction of the loudspeakers is controlled so that the two
loudspeakers 2-2 are emitted to the wall on both sides of the hole.
[0020]
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The signal processing unit 8 performs delay processing on the audio signal input from the signal
input unit 9 in accordance with the delay control signal output from the control unit 6, and emits
the main audio beam as a main audio beam. An audio signal and an audio signal for a side
acoustic beam to be emitted as a side acoustic beam are generated.
Then, the audio signal for the main acoustic beam is output to the amplifier 7-1, and the audio
signal for the side acoustic beam is output to the amplifier 7-2.
Here, the audio signal for the side acoustic beam is signal-processed by an FIR filter so as to fill in
between the sidewall multiple reflections before being output to the amplifier 7-2.
Here, although the FIR filter is used as the digital filter, an IIR (Infinite Impulse Response) filter
may be used, or the audio signal for the side acoustic beam is output as it is to the amplifier 7-2
without using the digital filter. You may do it.
[0021]
The amplifier 7-1 amplifies the audio signal for the main acoustic beam output from the signal
processing unit 8 at an amplification factor controlled by the control unit 6, and outputs the
amplified audio signal to the speaker 2-1 for emission as a main acoustic beam. Similarly, the
amplifier 7-2 amplifies the audio signal for the side acoustic beam output from the signal
processing unit 8 at a controlled amplification factor from the control unit 6, outputs it to the
speaker 2-2 and emits it as a side acoustic beam. .
[0022]
Next, the operation in the case where the sound generator 1 is installed in the hole 100 with a
width of 15 m as shown in FIG. 2 will be described. The sound generator 1 is installed in the
vicinity of a 15 m wide wall surface 100 a of the hole 100 as illustrated. Here, as shown by the
broken line in the figure, the audience position is originally the audience area 110 having a
certain range, but in the following, the position of the center of gravity of the audience area 110
is used to simplify the description. The audience position 111 is assumed to be 20 m in the front
direction of the sound generator 1.
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[0023]
First, when the sound generator 1 is installed in the hole 100, information on the shape of the
wall surface of the hole generated by CAD information or the like in the room information
recording area of the storage unit 3 via the information input unit 4, audience position 111 And
the information on the position where the sound generator 1 is installed are stored. Based on the
information in the room information recording area, the control unit 6 causes the direction
control unit 10 to emit the speakers 2-1 in the audience area of the hole and the two speakers 22 in the side wall of the hole, respectively. Control the pointing direction of the speaker. Also,
from the information in the room information recording area and the sound velocity 340 m / s,
the time t0 for the main sound beam emitted from the speaker 2-1 to reach the audience position
111, the side sound beam emitted from the speaker 2-2 sidewall Can be calculated once to reflect
to the audience position 111, 1 to 2 times to reflect to the audience position 111, and t3 to t4 in
order. As an example, the state of the side acoustic beam sb2 showing a state of being reflected
twice to the side wall is shown as a two-dot chain line in FIG. From the path length of 36.1 m and
the speed of sound of this side acoustic beam, it can be calculated as t2 = 106 ms. Similarly, it
can be calculated that t0 = 59 ms, t1 = 74 ms, t3 = 145 ms, and t4 = 186 ms. FIG. 3 shows an
impulse response sequence at the audience position 111 when the main acoustic beam and the
side acoustic beam are emitted, which indicate an impulse signal not subjected to delay
processing and amplification processing. The horizontal axis of the graph indicates the time
elapsed since the main acoustic beam and the side acoustic beam were emitted from the speakers
2-1 and 2-2, and the vertical axis indicates the volume of the impulse response. The broken line
in the figure indicates an impulse response when the signal processing unit 8 convolutes the
audio signal for side acoustic beam with the FIR filter.
[0024]
Next, the operator operates the operation unit 5 to set the clarity (D50) and the sense of spread
(LF). Then, the control unit 6 causes the signal processing unit 8 to perform delay processing of
the audio signal according to the setting in the operation unit 5, and controls the amplification
factor of the amplifiers 7-1 and 7-2. Here, the increase and decrease of D50 and LF when the
delay time and the amplification factor are controlled will be described.
[0025]
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First, the case where the delay of the audio signal is controlled will be described using FIGS. 4 (a)
to 4 (e). 4 (a) to 4 (e) show impulse response trains in the same manner as FIG. 3, and the
horizontal axis of the graph represents that at least one of the main acoustic beam and the side
acoustic beam emitted earlier is emitted. Indicates the time elapsed since
[0026]
First, as shown in FIG. 4A, when the alphabet is waved in the order of arrival for each impulse
response of the impulse response train, the impulse response A is generated from t0 to t0 + 50
ms when the first impulse response A arrives. To F, and from t0 to t0 + 80 ms, impulse responses
A to I are included. Then, as shown in FIG. 4B, when the audio signal for the main sound beam is
delayed by 10 ms, impulse responses A to H are included between t0 and t0 + 50 ms, and delay
processing is performed. D50 is increased by adding the impulse responses G and H, as
compared to the case where no. Also, the impulse response that reaches from the side from t0 +
5 ms to t0 + 80 ms, that is, the impulse response corresponding to the side acoustic beam
includes impulse responses B to K, and impulse responses J and K compared to the case without
delay processing. The LF also increases with the addition of.
[0027]
On the other hand, as shown in FIG. 4C, when the audio signal for side acoustic beam is delayed
by 10 ms, impulse responses A to D are included between t0 and t0 + 50 ms, and the delay
processing is performed. As compared with the case of not performing, the loss of the impulse
responses E and F reduces D50. Then, the impulse responses that are received from the side from
t0 + 5 ms to t0 + 80 ms include the impulse responses B to H, and the loss of the impulse
response I also reduces LF as compared with the case where the delay processing is not
performed.
[0028]
Next, the case where the amplification factor is controlled will be described. As shown in FIG. 4D,
as compared with the case of FIG. 4A, the amplification factor of the audio signal for the main
sound beam is increased to decrease the amplification factor of the audio signal for the side
sound beam. When the volume of the main acoustic beam is relatively increased, the ratio of the
acoustic energy of the main acoustic beam is increased, and the impulse responses A to F
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reached from t 0 to t 0 + 50 ms with respect to the total acoustic energy. As the ratio increases,
D50 increases. In addition, since the ratio of the acoustic energy from B to I to the side arriving
from t0 + 5 ms to t0 + 80 ms to the acoustic energy from impulse response A to I arriving from
t0 to t0 + 80 ms decreases, LF decreases Do.
[0029]
On the other hand, as shown in FIG. 4 (e), when the volume of the side acoustic beam is relatively
increased, the ratio of the acoustic energy of the main acoustic beam decreases, from t0 to t0 +
50 ms with respect to the total acoustic energy. Since the ratio of the acoustic energy of the
impulse responses A to F to reach R decreases, D50 decreases. In addition, since the ratio of the
acoustic energy from B to I, which arrives from the side from t0 + 5 ms to t0 + 80 ms, to the
acoustic energy of the impulse response A to I arriving from t0 to t0 + 80 ms increases, the LF
increases Do.
[0030]
Thus, when the delay time of the main acoustic beam is increased, D50 and LF both increase, and
when the delay time of the side acoustic beam is increased, both D50 and LF decrease. Therefore,
D50 and LF both increase and decrease with positive correlation due to the control of the delay
time. On the other hand, when the volume of the main acoustic beam is increased relative to the
volume of the side acoustic beam, D50 increases and LF decreases. Also, if the volume of the side
acoustic beam is increased relative to the volume of the main acoustic beam, D50 decreases and
LF increases. Therefore, depending on the control of the volume, that is, the control of the
amplification factor, D50 and LF increase or decrease with a negative correlation. As a result,
D50 and LF can be adjusted to various values by a combination of control of delay time and
amplification factor, and it is possible to cope with various intelligibility and sense of expansion.
[0031]
For example, in the case where only the intelligibility is improved and it is not desired to change
the sense of spread, D50 may be increased to keep LF constant. In that case, D50 is increased by
the process of delaying the audio signal for the main sound beam, and the LF is increased due to
the effect. On the other hand, if the amplification factors of the amplifiers 7-1 and 7-2 are
controlled so that the volume of the side acoustic beam becomes relatively smaller than the
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volume of the main acoustic beam in order to restore the LF to the original level, D50 can be
further increased to lower LF. This makes it possible to maintain LF constant and increase D50
only. In addition, although the process which delays the audio signal for main acoustic beams is
performed here, you may further delay process with respect to the audio signal for side acoustic
beams. In this case, processing may be performed so as to delay the main acoustic beam relative
to the side acoustic beam.
[0032]
Then, each audio signal subjected to delay and amplification control is emitted from the speaker
2-1 as a main acoustic beam and emitted as a side acoustic beam from the speaker 2-2, and as a
sound according to the set intelligibility and sense of spread, The audience position 111 is
reached.
[0033]
As described above, the shape of the wall of the used hole stored in advance in the storage unit 3
so that the sound generation device 1 can hear the sound according to the set intelligibility and
the sense of spread at the audience position. Based on the information on the audience position,
the position where the sound generator 1 is installed, and the set value output from the
operation unit 5, the control unit 6 uses D50 and LF as indicators of clarity and a sense of
spread, and delay time The amplification factor is calculated, the audio signal is delayed in the
signal processing unit 8, amplified in the amplifiers 7-1 and 7-2, and the main acoustic beam is
directed from the speakers 2-1 and 2-2 toward the audience position in the side wall direction By
emitting the side acoustic beam, the intelligibility and the sense of spread of the sound at the
audience position 111 can be easily controlled.
[0034]
Although the embodiments of the present invention have been described above, the present
invention can be implemented in various aspects as follows.
[0035]
<Modification 1> In the embodiment, the speaker 2-1 is a narrow directivity horn speaker
directed to the audience area of the hole, and the two speakers 2-2 are narrow directed to the
side wall of the hole. Although a directional horn speaker is used, the sound generator 11 may
emit the main sound beam directed to the audience area as the array speaker 12 and the side
sound beam directed to the side wall.
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In this case, as shown in FIG. 5, the phase and amplitude of the signal output from the signal
processing unit 8 are controlled so that the directional direction of the sound emitted from the
array speaker 12 can be controlled. A pointing control unit 18 is provided which outputs to each
of the amplifiers 17-1, 17-2, ..., 17-n connected to the speakers 12-1, 12-2, ..., 12-n. Just do it.
Here, with regard to the direction to be directed, the shape of the wall of the hole where the
sound generating device 11 stored in the room information storage area of the storage unit 3 is
installed, the audience area, the position where the sound generating device 11 is installed, etc.
The control unit 6 may calculate based on the information of the environment in which the
generator 11 is installed.
At this time, not only the direction in which the light beam is directed but also the directivity
angle (the spread of the acoustic beam) may be controlled. Thereby, the same effect as that of the
embodiment can be obtained. The main acoustic beam and the side acoustic beam may be
emitted in different directional directions by using a plurality of array speakers.
[0036]
<Modification 2> In the embodiment, the audience position 111 is set as the position of the
center of gravity of the audience area 110, but the audience positions may be set at a plurality of
places in the audience area 110. In this case, the difference between D50 determined by the
intelligibility set by the operation unit 5 and D50 at each listening position when sound is
emitted is calculated, and the sum of D50 differences at each audience position is minimized. It is
sufficient to make the control unit 6 calculate so that In this way, since the calculation is not in
one place but in a certain range, the set intelligibility can be given without discomfort to a wider
audience area. The control unit 6 may calculate LF as well as D50.
[0037]
<Modification 3> In the embodiment, the speed of sound is set to 340 m / s, but as indicated by a
broken line in FIG. 1, the temperature sensor 11 is connected to the control unit 6 and the
temperature detected by the temperature sensor 11 The controller 6 may be made to calculate in
such a way that the speed of sound has temperature dependency based on the following
04-05-2019
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equation. In that case, if the temperature detected by the temperature sensor 11 is t (° C.), it
may be calculated and corrected as 331.5 + 0.61 t (m / s). By this, it is possible to control the
clarity and the sense of expansion more accurately. The temperature sensor 11 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 6 by
[0038]
<Modification 4> In the embodiment, the side acoustic beam is emitted toward the side wall of
the hole, but another side acoustic beam may be directed to the audience or a direction other
than the direction in which the primary reflected sound reaches the audience, for example ,
Ceiling, upper side wall, upper rear wall, etc. As a result, it is possible to control the feeling of
being enveloped in the reverberation sound (LEV: Listener Envelope) separately from the
intelligibility and the sense of spread. Also, in order to prevent naturalness and howling, the
directional axis may be moved dynamically to make the sound field structure have time variation.
[0039]
<Modification 5> In the embodiment, the clarity is D50, and the ratio of the acoustic energy up to
the initial 50 ms to the total acoustic energy of the impulse response at the audience position is
used as the index of the sound clarity The time of 50 ms may be changed. In this case, the
change may be made by operating the operation unit 5. In this way, it is possible to test the
change in sound clarity at various setting values, and it is possible to select the optimum setting
value suitable for the installation environment. The values (5 ms, 80 ms) regarding time may be
set for LF as well as D50.
[0040]
<Modification 6> In the embodiment, D50 and LF are used as indices of clarity and a feeling of
spread, but another index may be newly created and calculated. In this case, the program stored
in the predetermined area of the storage unit 3 via the information input unit 4 may be changed
to a program that can be calculated based on the new index, or the storage unit in advance A
plurality of programs may be stored in 3 and a program may be selected in the operation unit 5.
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In this way, various indicators can be used to test the changes in clarity and sense of spread, and
it is possible to select the most suitable program for the installed environment.
[0041]
<Modification 7> In the embodiment, the sound generation device 1 is installed in the hole 100
in a space closed by wall surfaces, but is installed in a region having an audience area and at
least one wall surface. It is also good. In this case, the main acoustic beam may be emitted to the
audience area and the side acoustic beam may be emitted to the wall surface. Then, the side
acoustic beam reflected on the wall surface may reach the audience area. Thus, the sound
generator 1 can be installed not only indoors but also in various places.
[0042]
It is a block diagram showing composition of a sound generator concerning an embodiment of
the present invention. It is explanatory drawing which shows the relationship between the sound
generation apparatus installed in the hall | hole, and an audience position. It is an explanatory
view showing an impulse response sequence in an audience position when not performing delay
processing. It is explanatory drawing which shows the impulse response sequence in an audience
position. It is explanatory drawing which shows the impulse response sequence in the audience
position at the time of delay-processing to a main acoustic beam. It is explanatory drawing which
shows the impulse response sequence in the audience position at the time of delay-processing to
a side acoustic beam. It is explanatory drawing which shows the impulse response sequence in
the audience position at the time of making volume of the main acoustic beam relatively large. It
is explanatory drawing which shows the impulse response sequence in the audience position at
the time of making the volume of a side acoustic beam relatively large. It is a block diagram
which shows the structure of the sound generation apparatus which concerns on the
modification 1 of this invention.
Explanation of sign
[0043]
DESCRIPTION OF SYMBOLS 1, 11 ... Sound generator, 2-1, 2-2, 12-1, 12-2, ..., 12-n ... Speaker, 3
... Storage part, 4 ... Information input part, 5 ... Operation part, 6: Control unit, 7-1, 7-2, 17-1, 172, ..., 17-n ... Amplifier, 8 ... Signal processing unit, 9 ... Signal input unit, 10 ... Direction control
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unit, 11 ... Temperature sensor, 12 ... Array speaker, 18 ... Pointing control unit, 100 ... Hall, 100a
... Hall wall surface, 110 ... Audience area, 111 ... Audience position
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