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JP2004104210

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DESCRIPTION JP2004104210
An object of the present invention is to realize high sound quality of sound to be heard by a
listener. SOLUTION: The individual chairs 16 for seating a large number of listeners installed in
the guest seat space 12B of the auditorium 12 are directed toward the listeners sitting on a chair
16 present on the rear side as viewed from the stage 12A side. Each reinforcement speaker 30 is
attached so as to emit sound, and the sound emitted from the reinforcement speaker 30 is given
to the individual listeners as a sound to reinforce the sound emitted from the main speaker 26
and directly reaching the individual listeners. As heard, the sound emitted from the reinforcing
speaker 30 is generated from the reinforcing speaker 30 at a timing according to the time
required for the sound emitted from the main speaker 26 to reach the individual listeners
directly. [Selected figure] Figure 1
Acoustic equipment, acoustic equipment and buildings
[0001] The present invention relates to an acoustic device, an acoustic equipment, and a
building, and in particular, a chair for a listener to listen to a sound emitted from a sound source
sits in, the sound source being present The present invention relates to an acoustic device and an
acoustic device installed in a space arranged in a plurality of rows in a direction, the acoustic
device or a building in which the acoustic device is installed. 2. Description of the Related Art
Acoustic equipment installed in an indoor space where a large number of listeners sitting on a
chair listen to sounds, such as a conference room, a theater or an auditorium, generally has a
Hass effect. It is built using. The Hearth effect is that human beings perceive the direction
(position) of a sound source based on the direction of arrival of a direct (first) sound emitted
from a sound source (referred to as a direct sound) and This is a phenomenon in which a sound
that arrives with a delay time of about 5 to 50 milliseconds or less is perceived as a sound that
reinforces the direct sound (hereinafter, this sound is referred to as a reinforcement sound). Note
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that sound arriving with a delay time shorter than 5 ms with respect to direct sound changes the
sense of direction of direct sound when the difference between the direct sound arriving
direction and the delayed sound arriving direction is large. Sound (a principle of stereophonics),
and sounds arriving with a delay time longer than 50 ms with respect to direct sounds are
perceived as harmful echoes (a phenomenon in which the same sound is repeatedly heard)
separated from direct sounds, or walls And if it is reflected many times by the ceiling, it is
perceived as reverberation, so neither is perceived as a reinforcement sound. For this reason, in
the above-described acoustic equipment installed in the indoor space, reinforcing speakers for
generating a sound to be heard as a reinforced sound by the listener are placed at a plurality of
locations on the wall or ceiling of the indoor space. Each reinforcing speaker is disposed in a
distributed manner, so that the same sound as the sound emitted from the sound source is
generated from each reinforcing speaker, and the sound generated from each reinforcing speaker
is heard by the listener as a reinforcing sound. It is configured to control the amount of delay of
the timing of generating the size and the sound of the sound generated from. Further, according
to Patent Document 1, as a technology to make the listener perceive the direction of the sound
source by delaying the sound emitted from the sound source, the distance between the speaker
in front of the stage and the speaker who is the sound source on the stage There is disclosed a
technique for accurately performing sound image localization regardless of the position of the
listener by delaying the voice output timing of the speaker on the stage accordingly. [Patent
Document 1] Japanese Patent Application Laid-Open No. 10-126900 (page 5-6).
SUMMARY OF THE INVENTION However, even in a relatively large indoor space where high
quality voice transmission is required, such as in theaters and auditoriums, even if the abovedescribed audio equipment is installed, listening is possible. Many problems occur that the sound
heard by a person becomes unclear. That is, the above-mentioned audio equipment functions
effectively if the installation space is a relatively small space such as a conference room, but the
distance between the reinforcing speaker and the listener is inevitable as the installation space
becomes larger. The sound pressure level of the sound generated from the reinforcing speakers
is increased in order for the listener to be able to hear the sound generated from each of the
reinforcing speakers as the reinforcing sound of a certain volume. I can not but do. With the
increase of the sound pressure level, the sound pressure level of the reverberant sound generated
by the sound generated from the reinforcing speaker also increases, and as a result of this
reverberant sound being superimposed on the direct sound and the reinforcing sound, the sound
equipment In the space where the sound source is installed and in the vicinity of the reinforcing
speaker (for example, the distance from the sound source is within several meters). In places
other than the above, distortion of the direct sound and the reinforcement sound occurs due to
the superposition of the reverberation sound, which makes it difficult to ensure the clarity of the
listening sound. Also, in the prior art, it is a general feature that the directional shift between the
sound source and the reinforcing speaker seen from the listener is large, and in this case, the
magnitude of the sound generated by the reinforcing speaker and the delay from the appropriate
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value However, they often change the perception of the direction of the sound source and give an
unnatural impression. Further, the number of reinforcing speakers to be installed is increased
according to the enlargement of the space for installing the audio equipment, the increase of the
number of listeners, the increase of the area (area) where the listeners are seated, etc. In order to
achieve the above, extremely complicated control is required for the sound generated from the
reinforcing speaker. In such a case, the control is originally simplified due to economic reasons
or the like, otherwise the device is likely to become unstable, and not only does it perform its
function sufficiently, but howling and echo it was not originally expected There are many cases
where acoustic disturbances such as are induced. The present invention has been made in
consideration of the above-mentioned facts, and it is an object of the present invention to obtain
an acoustic device, an acoustic equipment and a building capable of realizing high sound quality
of the sound heard by a listener. SUMMARY OF THE INVENTION In order to achieve the above
object, according to the sound device of the invention as set forth in claim 1, a chair on which a
listener who listens to a sound emitted from a sound source can sit is An acoustic device installed
in a space arranged in a plurality of rows toward the direction in which the sound source is
present, wherein each chair is directed to a listener who sits on a chair present on the rear side
viewed from the sound source side As a reinforcing speaker attached so as to emit a sound, and a
sound emitted from the reinforcing speaker as a sound that reinforces a sound emitted from the
sound source and directly reaching an individual listener seated on an individual chair The
timing at which the sound is emitted from the reinforcing speaker is controlled according to the
time required for the sound emitted from the sound source to reach the individual listeners
directly so that the individual listeners will be heard. control Is characterized by comprising: a
stage, a.
According to the sound device of the first aspect of the present invention, a chair on which a
listener who listens to the sound emitted from the sound source is seated is installed in a space in
which a plurality of rows are arranged in the direction in which the sound source exists. Be done.
Here, in the invention according to claim 1, the reinforcing speaker is configured to emit a sound
to the individual chair disposed in the space toward the listener seated on the chair present on
the rear side viewed from the sound source side. It is attached. In addition, the chair in which the
speaker for reinforcement is attached may be all the chairs arrange ¦ positioned in space, or may
be some chairs, for example, the chair arrange ¦ positioned in the area relatively distant from a
sound source. Alternatively, it may be a chair having another chair on the rear side as viewed
from the sound source side, or a reinforcement speaker may be attached to a chair of a row of
plural rows of chairs, or in a single row In each of the chairs, a reinforcing speaker may be
attached to each chair. The control means according to the invention of claim 1 is a system in
which the sound emitted from the reinforcing speaker is transmitted directly from the sound
source to the individual listeners seated on the individual chairs (direct sound The sound emitted
from the sound source is required for the sound emitted from the sound source to reach the
individual listeners directly so that the individual listeners hear the sound as the sound that
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reinforces) Control according to time. As a result, for the chair in which each listener is seated,
the sound generated from the reinforcing speaker attached to the chair on the front side viewed
from the sound source side is heard as the reinforcement sound for each listener (Haas effect). As
described above, according to the first aspect of the present invention, in addition to allowing
listening at a position hardly influenced by reverberation in the vicinity of the reinforcing
speaker, the distance between the reinforcing speaker and the listener is reduced. Therefore, the
loudness of the sound emitted from the reinforcing speaker can be reduced, and the loudness of
the reverberant sound of the sound emitted from the reinforcing speaker is significantly reduced
accordingly. The clarity of the sound being played can be improved. In addition, the sound
emitted from the reinforcing speaker is absorbed by the listener who is mostly seated in the chair
before being reflected by the wall or ceiling, thus causing an acoustic disturbance such as
harmful echo. Nor. Furthermore, the individual chairs face the direction in which the sound
source is present, and the reinforcing speakers attached to the individual chairs emit a sound
toward the listener seated in the chair located on the rear side viewed from the sound source side
Therefore, for the individual listeners, the deviation in the arrival directions of the sound (direct
sound) emitted from the sound source and the sound (reinforcing sound) generated from the
reinforcing speaker is also very small, and the sense of direction of the sound source is not
impaired.
Therefore, according to the first aspect of the present invention, it is possible to realize high
sound quality of the sound to be heard by the listener. Further, if the reinforcing speakers are
attached in advance at the time of manufacture of the chair, the arrangement of the reinforcing
speakers in the space can be completed simultaneously by arranging the chair in the space.
[0015] In the invention according to claim 1, the reinforcing speaker is suitable for attaching the
reinforcing speaker so as to emit sound toward a listener sitting on a predetermined part of a
chair (for example, a chair present on the rear side) It is preferable to embed it in the backrest
portion etc. and conceal it so that it can not be seen from the outside. As a result, the possibility
of the reinforcing speaker being damaged by human beings can be greatly reduced, and the
appearance of the reinforcing speaker can be completely unknown, so that the design of the
chair can be prevented from being impaired. Therefore, it is desirable that the reinforcing
speaker be a speaker of a shape and size that can be embedded and concealed in a
predetermined portion of the chair. In the first aspect of the present invention, as the reinforcing
speaker, speakers of various known configurations can be applied. For example, as described in
the second aspect, the acoustic diaphragm is made of a piezoelectric vibrator. It is preferable to
apply the speaker (For example, utility model registration 3037167, Unexamined-JapanesePatent No. 2000-134682 etc.) of the structure which emits a sound by making it vibrate. Since
the speaker having the above configuration can be made extremely thin, as described above, it is
possible to easily embed the reinforcing speaker in the backrest portion of the chair and the like
so as to hide it from the outside. In addition, since the speaker composed of the piezoelectric
vibrator and the acoustic diaphragm is excellent in response particularly to the sound of about
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200 Hz or more, it is preferable when the sound emitted from the reinforcing speaker mainly
includes the sound in this frequency band. The effect is also obtained that the listener can be
made to listen with good reproducibility. In the invention according to claim 2, for example, as
described in claim 3, the piezoelectric vibrator is embedded in the back of a chair, and a
predetermined member constituting the back of the chair is used as an acoustic diaphragm. It is
preferable to generate a sound by vibrating the predetermined member by the piezoelectric
vibrator. As a result, there is no need to newly provide a member that acts as an acoustic
diaphragm in attaching the reinforcement speaker to the chair, so it is possible to embed the
reinforcement speaker in the backrest even if the chair is thin. It becomes. Furthermore, in the
case where a large number of chairs are arranged in a space where the acoustic device according
to the invention of claim 1 is installed, the control means controls the timing of generating sound
from the reinforcing speaker as the individual chairs. It may be configured to perform as a unit
the individual reinforcing speakers attached to the unit, but the desired timing of sound
generation from the reinforcing speakers (the above-mentioned sound for allowing the sound
emitted from the reinforcing speakers to be heard as the reinforcing sound The timing of
occurrence of) changes according to the time required for the sound emitted from the sound
source to reach the individual listeners directly, and the time is the distance from the sound
source to the distance between the sound source and the chair (the chair in which it is seated).
Taking account of the fact that, depending on the distance from the sound source, each group of
chairs may be divided into a plurality of groups of chairs. It is preferable to control the timing
which generates a sound from a speaker for reinforcement by making a loop into a unit.
According to the fourth aspect of the present invention, the multiple rows of chairs are divided
into groups of multiple rows of chairs according to the distance from the sound source, and the
timing for generating sound from the reinforcing speakers in units of individual groups is
determined. Since the control is performed, control of the timing at which sound is generated
from the reinforcing speakers can be simplified as compared with the case of performing control
of the individual reinforcing speakers as a unit. According to a fifth aspect of the present
invention, there is provided an audio equipment, which represents the sound device according to
any one of the first to fourth aspects, a main speaker as the sound source, and a sound to be
emitted from the main speaker. The amplifier includes an amplifier for amplifying an audio signal
and supplying it to the main speaker, and the control means of the acoustic device delays the
audio signal and supplies it to the reinforcing speaker and controls the delay time of the audio
signal. Thus, the present invention is characterized by controlling the timing at which sound is
generated from the reinforcing speaker. The invention according to claim 5 includes the acoustic
device according to any one of claims 1 to 4 in addition to the main speaker and the amplifier, so
that the invention according to any one of claims 1 to 4 is provided. Similar to the invention, it is
possible to realize high sound quality of the sound heard by the listener. [0021] In the building
according to the invention of claim 6, there is a space in which a plurality of chairs for seating
the listeners who listen to the sound emitted from the sound source are arranged in a plurality of
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rows toward the direction in which the sound source is present. It is characterized in that the
acoustic device according to any one of claims 1 to 4 or the acoustic equipment according to
claim 5 is installed in the space formed inside. In the invention according to claim 6, the acoustic
device according to any one of claims 1 to 4 or the acoustic equipment according to claim 5 is
installed in a space formed in the inside. Similarly to the invention described in any of the items
5, it is possible to realize high sound quality of the sound to be heard by the listener in the space.
Hereinafter, an example of an embodiment of the present invention will be described in detail
with reference to the drawings. An acoustic device 10 according to the present embodiment is
shown in FIG. The audio apparatus 10 is installed in an indoor space, and in FIG. 1, as an example
of the indoor space, a stage 12A where the speaker 14 is located and a listener who listens to the
lecture sit when a lecture is given. There is shown an auditorium 12 comprising a plurality of
seating spaces 12B with a number of chairs 16 (see also FIG. 2) mounted in rows towards the
stage 12A. When a lecture or the like is performed in the auditorium 12, a microphone 18 for
detecting a sound emitted by the speaker 14 is installed on the stage 12A.
The microphone 18 is connected to the preamplifier 20, and an audio signal representing the
voice emitted by the speaker 14 is amplified by the preamplifier 20 and output. The output end
of the preamplifier 20 is connected to the three main speakers 26 disposed behind the stage 12A
through the three frequency correction circuits 22 and the three amplifiers 24 respectively. On
the other hand, as shown by a broken line in FIG. 2, the individual chairs 16 installed in the
seating space 12B are sounded toward the listener seated on the chair 16 present on the rear
side as viewed from the stage 12A side. Reinforcing speakers 30 for emitting light are embedded
in the left and right two places of the backrest 28 respectively. As shown in FIG. 3B, the backrest
28 of the chair 16 includes a cushioning material 32 made of sponge or the like, a support
member 34 for supporting the cushioning material 32, and a back surface member 36 covering
the back of the backrest 28. A gap is formed between the support member 34 and the back
member 36. The reinforcing speaker 30 according to the present embodiment is configured by
attaching the piezoelectric vibrating body 38 disposed in the gap between the support member
34 and the back surface member 36 to the back surface member 36. The piezoelectric vibrator
38 is formed in a circular shape and on both sides of a piezoelectric element layer made of
bimorph or the like, and when an audio signal is applied, it vibrates with an amplitude according
to the voltage level of the applied audio signal. A circular hole (not shown) is bored in the center
of the piezoelectric vibrating body 38, and the other end of the mounting member 40 having an
enlarged diameter portion 40A formed at one end penetrates through the circular hole. A male
screw is formed in a portion of the mounting member 40 which penetrates the piezoelectric
vibrator 38, and the female screw of the nut 42 is screwed to the male screw, whereby the
mounting member 40 is integrated with the piezoelectric vibrator 38. Is attached to The enlarged
diameter portion 40A of the mounting member 40 is attached to the back member 36 by an
adhesive or the like. Further, an annular vibration control piece 44 is attached to one side surface
of the piezoelectric vibrator 38 along the outer peripheral edge portion. The vibration control
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piece 44 is made of an elastic material such as rubber and has a diameter that does not deviate
radially outward from the outer peripheral edge of the piezoelectric vibrator 38 (that is, a size
that makes the diameter of the piezoelectric vibrator 38 the largest). It is done. The vibration
control piece 44 acts as an inertial mass when the piezoelectric vibration body 38 vibrates, and
the portion of the piezoelectric vibration body 38 to which the vibration control piece 44 is stuck
is to keep stopping at the original position. When an audio signal is applied to the piezoelectric
vibrator 38, the central portion of the piezoelectric vibrator 38 mainly vibrates.
Then, when the central portion of the piezoelectric vibrator 38 vibrates, the vibration is
transmitted to the back member 36 through the attachment member 40, whereby the back
member 36 is also vibrated, and the vibration of the back member 36 causes piezoelectricity. The
sound represented by the audio signal applied to the vibrator 38 is emitted rearward as viewed
from the stage 12A. The vibration control piece 44 also has a function of suppressing the
resonance of the piezoelectric vibrating body 38 by absorbing the vibration of the piezoelectric
vibrating body 38 and improving the frequency characteristics of the reinforcing speaker 30. The
reinforcing speaker 30 is not limited to the configuration shown in FIG. 3B. For example, as
shown in FIG. 4, the reinforcing member 30 covering the back surface of the backrest portion 28
of the chair 16 is thick In the case where the cushioning material 32 is in close contact with the
cushioning material 32 to support the cushioning material 32, the notch 36A is formed in the
back member 36, and the piezoelectric vibrator 38 and the attachment member are formed in
the notch 36A. While accommodating members such as 40, the nut 42, and the vibration control
piece 44, a configuration in which the opening of the notch 36A is closed by the lid member 46
may be adopted. As shown in FIG. 1, the large number of chairs 16 installed in the seating space
12 B are divided into a plurality of groups each consisting of a plurality of rows of chairs (in FIG.
1, the group is described as block ) In addition, reinforcing speaker driving units 50 are
provided respectively corresponding to the respective groups (blocks) and the blocks A and B).
The reinforcing speaker 30 attached to the chair 16 belonging to the specific block is connected
to the reinforcing speaker driving unit 50 corresponding to the specific block. The reinforcing
speaker driving units 50 corresponding to the individual blocks have the same configuration.
Therefore, the reinforcing speaker driving unit 50 corresponding to the block A will be described
as an example. 50 is constructed by sequentially connecting howling suppression unit 52, delay
circuit 54, frequency correction circuit 56 and amplifier 58, and the audio signal output from
preamplifier 20 is input to howling suppression unit 52. The howling suppression unit 52
generates howling due to the microphone and the reinforcing speaker 30 when the microphone
is brought into the seating space 12 B, for example, when a listener asks a question to the
speaker in a lecture or the like. In order to prevent this, it is monitored whether or not the signal
level in a specific frequency band of the input audio signal has become equal to or higher than a
predetermined value, and the signal level is Perform howling suppression processing to reduce.
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The delay circuit 54 delays the audio signal input from the howling suppression unit 52 by a
predetermined delay time Δt1. Although the details will be described later, the delay time in the
delay circuit 54 is different in units of the individual reinforcing speaker driving units 50
corresponding to the individual blocks. The audio signal delayed by the delay circuit 54 is input
to the frequency correction circuit 56, and the signal level is adjusted for each frequency band in
accordance with the frequency characteristic of the reinforcing speaker 30, etc., and then
amplified by the amplifier 58 to correspond. It is respectively supplied to all reinforcing speakers
30 attached to all the chairs 16 belonging to the block. Next, the operation of the present
embodiment will be described. When a lecture is given in the auditorium 12, the voice emitted by
the speaker 14 at the time of the lecture is once converted into a voice signal by the microphone
18, and once amplified by the preamplifier 20, it is input to the frequency correction circuit 22.
The frequency correction circuit 22 adjusts the signal level of the input audio signal for each
frequency band in accordance with the frequency characteristic of the main speaker 26, the
sound field characteristic of the auditorium 12, and the like. The audio signal output from the
frequency correction circuit 22 is amplified again by the amplifier 24 and then supplied to the
main speaker 26. As a result, the sound emitted by the speaker 14 is emitted as a sound (sound
wave) from the main speaker 26 toward the passenger seat space 12 B, and the sound wave
propagates in the auditorium 12 and the listener is seated. By reaching each of the chairs 16, a
sound (sound wave) is to be heard by a listener seated on each chair 16. The main speaker 26
corresponds to the sound source described in claim 1. By the way, since the distance between the
main speaker 26 and the listener is different for each listener depending on where in the seating
space 12 B the listener is seated, the main speaker 26 After the sound (sound wave) is emitted,
the sound wave propagates in the auditorium 12 and reaches the position where the listener is
seated directly, and the time until the listener is heard as sound (direct sound) is also Each
listener is different depending on the distance between the main speaker 26 and the listener.
Therefore, due to the difference in sound wave propagation time for each listener, the optimal
sound generation timing from the reinforcing speaker 30 (allowing the listener to listen to the
sound generated by the reinforcing speaker 30 as a sound to reinforce the direct sound) The
timing for this will also be different for each individual listener.
Therefore, in the present embodiment, the large number of chairs 16 installed in the passenger
seat space 12 B are divided into groups (blocks) each consisting of a plurality of rows of chairs
16 according to the distance from the main speaker 26. The delay time in the delay circuit 54 of
the reinforcing speaker driving unit 50 corresponding to each block is generated by the sound
generated from the reinforcing speaker 30 attached to each chair 16 in each block. It is set to be
heard as a sound that reinforces the direct sound by a listener who is seated in the rear seat 16
of the. Specifically, for the block x (where n and m are both integers, n <m) composed of the chair
16 in the n-th row to the chair in the m-th row when viewed from the stage 12 A side, The time
(the direct sound propagation time) until the sound wave emitted from the main speaker 26
reaches each chair 16 is measured for each chair 16 of the (n + 1) th column to the (m + 1) th
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column, and the average value tx of the measured direct sound propagation times Calculate Then,
based on the time difference Δt (for example, about 10 milliseconds to 20 milliseconds) of the
arrival timing of the optimal reinforcement sound with respect to the arrival timing of the direct
sound and the average value tx of the direct sound propagation time, the (n + 1) th column to the
m + 1th column The delay time in the delay circuit 54 of the reinforcing speaker driving unit 50
corresponding to the block x so that the sound generated from the reinforcing speaker 30 arrives
approximately Δt after the direct sound arrives at each eye chair 16 Are set for the delay circuits
54 of the reinforcing speaker driving unit 50 corresponding to each block. Thus, the viewer who
is seated in each of the chairs 16 installed in the guest seat space 12 B perceives the sound
generated directly by the main speaker 26 as the direct sound and the viewer is seated. The
sound emitted backward by the reinforcement speaker 30 of the chair 16 present in front of the
chair 16 (same sound as the sound generated by the main speaker 26) is added to the viewer as
a reinforcement sound that reinforces the direct sound. It will be perceived. As described above,
in the present embodiment, since the chair 16 existing in front of the chair 16 in which the
individual listeners are seated emits a sound that is perceived as the reinforcement sound to the
individual listeners. The distance between each listener and the source of the reinforcement
sound (in this embodiment, the reinforcement speakers 30 attached to the front chair 16) is
small (this distance corresponds to the arrangement pitch P of the chairs 16 (see FIG. 1)
Approximately equal, usually about P = 0.9 to 1 m).
Therefore, since the sound pressure level of the sound to be generated by the reinforcing speaker
30 can be small while being able to listen in the vicinity of the speaker where the influence of the
reverberation is originally small, the sound generated by the sound generated by the reinforcing
speaker 30 The sound pressure level of the reverberant sound also decreases. Further, in
addition to the fact that the sound pressure level of the sound generated from the reinforcing
speaker 30 is small, the majority of the sound is absorbed by the listener present in the vicinity
of the reinforcing speaker 30, thus avoiding the induction of the echo. be able to. Furthermore, it
is clear that howling suppression is also between the reinforcing speaker 30 located in the
vicinity of the microphone and the microphone when the microphone is brought into the
customer seat space 12B, and the influence of reverberation is Because it is not received, the
processing content of the howling suppression circuit 52 can be sufficiently erased. These can
improve the intelligibility of sounds heard by individual listeners. Also, the reinforcement sounds
heard by the individual listeners are generated from the reinforcement speakers 30 attached to
the chair 16 located in front of the chair 16 where the individual listeners are seated. The
augmentation sounds heard by the individual listeners will come from the same direction as the
direct sound (i.e. in front of the individual listeners). As described above, for the individual
listeners, the difference between the direction of arrival of the sound generated from the main
speaker 26 (direct sound) and the sound generated from the reinforcing speaker 30
(reinforcement sound) is very small. The sense of direction is not likely to be disturbed from the
beginning, and compared with the case where the directions of arrival of the direct sound and
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the reinforcement sound are largely different, the setting amount of delay and level have less
influence on the direct sense of the direct sound. Control of the sound generated from the
reinforcing speaker 30 may also be simple. Although the example in which the delay time is
controlled in block units has been described above, the present invention is not limited to this.
The delay time is controlled in units of individual listeners (individual chairs 16). May be In this
case, although the configuration of the acoustic device 10 becomes complicated, the time
difference between the arrival timing of the direct sound and the arrival timing of the
reinforcement sound can be accurately controlled in units of individual listeners (individual
chairs 16). Further, in the above, as the reinforcing speaker according to the present invention,
by reinforcing the configuration that radiates the sound toward the listener present on the rear
side of the chair 16 by vibrating the back member 36 by the piezoelectric vibrating body 38
Although the example provided with the speaker 30 has been described, the present invention is
not limited to this, and instead of the back surface member 36, a configuration for vibrating a
dedicated acoustic diaphragm designed to emit a sound In place of the reinforcing speaker 30, a
more general dynamic speaker may be used.
However, these speakers are difficult to be thin as compared to the reinforcing speaker 30
described above, which may impair the design of the chair 16 or may be difficult to embed in the
chair 16. Because of the presence, it is desirable to adopt a similar configuration to the
reinforcing speaker 30 and the reinforcing speaker 30. As described above, according to the first
aspect of the present invention, each chair for a listener who listens to the sound emitted from
the sound source is seated on the back side as viewed from the sound source side. The
reinforcement speakers are attached to emit sound toward the listener sitting in the existing
chair, and the sound emitted from the reinforcement speaker is emitted from the sound source
and directly reaches the individual listeners sitting in the individual chairs The timing at which
the sound is emitted from the reinforcing speaker is the time required for the sound emitted from
the sound source to reach the individual listeners directly so that the individual listeners hear the
sound as a sound that reinforces Since the control is performed accordingly, it has an excellent
effect that high sound quality of the sound heard by the listener can be realized. According to the
second aspect of the invention, in the invention according to the first aspect, the speaker
configured to emit a sound by vibrating the acoustic diaphragm with the piezoelectric vibrator is
used as the reinforcing speaker. In addition, by attaching the reinforcing speaker, it is possible to
avoid that the design of the chair is impaired. According to the invention of claim 3, in the
invention of claim 2, the piezoelectric vibrator is embedded in the backrest of a chair, and a
predetermined member constituting the backrest of the chair is used as an acoustic diaphragm,
and the predetermined member is piezoelectric Since the sound is generated by being vibrated
by the vibrator, in addition to the above effect, there is an effect that it is possible to embed the
reinforcing speaker in the backrest even if the backrest is a thin chair. The invention according to
claim 4 relates to the invention according to claim 1 in which the multiple rows of chairs are
divided into groups of multiple rows of chairs according to the distance from the sound source.
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Since the timing of generating the sound from the reinforcing speaker is controlled, in addition to
the above effect, the configuration of the control means (sound device) can be simplified. [0047]
The invention according to claim 5 includes the acoustic device according to any one of claims 1
to 4, a main speaker, and an amplifier for amplifying an audio signal and supplying the amplified
signal to the main speaker. , And has an excellent effect of realizing high sound quality of the
sound to be heard by the listener.
According to the sixth aspect of the present invention, since the acoustic device according to any
one of the first to fourth aspects or the acoustic equipment according to the fifth aspect is
installed in a space formed in the inside, It has an excellent effect that high sound quality of the
sound heard by the listener in the space can be realized. BRIEF DESCRIPTION OF THE
DRAWINGS FIG. 1 is a block diagram showing a schematic configuration of an acoustic device
according to an embodiment of the present invention. FIG. 2A is a front view of a chair according
to the present embodiment, and FIG. FIG. 3A is a side view of a chair according to the
embodiment, and FIG. 3B is a schematic cross-sectional view showing an example of a reinforcing
speaker attached to each chair. FIG. 4 is a schematic cross-sectional view showing another
example of a reinforcing speaker attached to an individual chair. [Description of the code] 10
acoustic device 16 chair 18 microphone 26 main speaker 30 reinforcing speaker 36 back
member 38 piezoelectric vibrator 44 vibration control piece 50 reinforcing speaker driving unit
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