JP2004104210A - Acoustic device, acoustic facility and building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a high quality of sounds to be received by listeners. <P>SOLUTION: Reinforcing speakers 30 are mounted respectively on many listener sitting chairs 16 installed in the seat spaces 12B of a hall 12 so as to produce sounds toward the listeners to sit on the chairs 16 located on the rear side, as seen from a stage 12A. The speakers 30 produce sounds at timings according to the time taken by sounds produced from a main speaker 26 to directly arrive at the individual listeners, so that the individual listeners can hear as sounds reinforcing the sounds directly arriving at the listeners from the main speaker 26. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an acoustic device, an acoustic facility, and a building, in particular, a space in which a plurality of chairs for a listener who listens to a sound emitted from a sound source are arranged in a plurality of rows in a direction in which the sound source exists. TECHNICAL FIELD The present invention relates to an acoustic device and acoustic equipment installed in a building, and a building in which the acoustic device or the acoustic equipment is installed.
[0002]
[Prior art]
Audio equipment installed in an indoor space, such as a conference room, a theater, or an auditorium, where a large number of listeners sitting on chairs listen to sound, is generally constructed using the Haas effect. The Haas effect means that the human perceives the direction (position) where the sound source exists based on the direction of arrival of the sound (direct sound) directly emitted from the sound source (called “direct sound”). A sound arriving with a delay time within about 5 to 50 milliseconds is perceived as a sound that directly reinforces the sound (hereinafter, this sound is referred to as a reinforcing sound).
[0003]
The sound arriving with a delay time shorter than 5 milliseconds from the direct sound acts to change the sense of direction of the direct sound if the difference between the arrival direction of the direct sound and the arrival direction of the delayed sound is large. (Stereophonic principle) A sound arriving with a delay time longer than 50 milliseconds from the direct sound is perceived as a harmful echo separated from the direct sound (a phenomenon in which the same sound is heard repeatedly), or on walls and ceilings. After being reflected many times, it is perceived as reverberation, and neither is perceived as a reinforcement sound.
[0004]
For this reason, the acoustic equipment installed in the indoor space as described above arranges reinforcing speakers for generating a sound that is heard as a reinforcing sound by a listener at a plurality of places on a wall or a ceiling of the indoor space. 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 generated from each reinforcing speaker so that the listener can hear the sound generated from each reinforcing speaker as a reinforcing sound. It is configured to control the loudness of the sound and the amount of delay in the timing at which the sound is generated.
[0005]
Patent Document 1 discloses a technique in which a sound emitted from a sound source is delayed so that a listener can perceive the direction of the sound source according to the distance between a speaker in front of the stage and a speaker as a sound source on the stage. There is disclosed a technique for delaying the sound output timing of a speaker on a stage to accurately perform sound image localization regardless of the position of a listener.
[0006]
[Patent Document 1]
JP-A-10-126900 (pages 5-6).
[0007]
[Problems to be solved by the invention]
However, in a relatively large indoor space such as a theater or an auditorium where high-quality voice transmission is required, even if the above-described sound equipment is installed, the sound heard by the listener becomes unclear. There are many problems. That is, the above-described acoustic equipment functions effectively when the installation space is a relatively small space such as a conference room, but as the installation space increases, the distance between the reinforcing speaker and the listener is inevitable. The sound pressure level of the sound generated from the reinforcement speaker must be increased in order for the sound generated from each reinforcement speaker to be heard by the listener as the reinforcement sound of a certain volume. I have to do it.
[0008]
With the increase in the sound pressure level, the sound pressure level of the reverberation sound generated by the sound generated from the reinforcing speaker also increases, and the reverberation sound is superimposed on the direct sound and the reinforcement sound, and as a result, the acoustic equipment is installed. In places other than the vicinity of the sound source and the reinforcing speaker (for example, the distance from the sound source is within several meters) in the space, the direct sound and the reinforcing sound are distorted due to the superposition of the reverberation sound, thereby ensuring the clarity of the listening sound. It will be difficult to do. Further, in the prior art, it is a general feature that the direction deviation between the sound source and the reinforcing speaker viewed from the listener is large, and in this case, the magnitude of the sound generated by the reinforcing speaker and the deviation from the appropriate value of the delay amount are increased. However, it often changes the perception of the direction of the sound source, giving an unnatural impression.
[0009]
Further, as the size of the space for installing the audio equipment increases, the number of listeners increases, and the area (area) in which the listeners sit increases, the number of reinforcing speakers installed increases, and a sufficient reinforcing effect is obtained. Requires extremely complicated control of the sound generated from the reinforcing speaker. In such a case, the control was originally simplified due to economic reasons, etc., or otherwise the device was liable to be unstable, not only did not perform its function sufficiently, but also howling or echo that was not initially assumed There are many cases where acoustic disturbances such as the above are induced.
[0010]
The present invention has been made in view of the above facts, and has as its object to obtain an acoustic device, an acoustic facility, and a building capable of realizing high quality sound heard by a listener.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the acoustic device according to the first aspect of the present invention is configured such that a plurality of chairs for a listener who listens to a sound emitted from a sound source are arranged in a plurality of rows in a direction in which the sound source exists. A sound device installed in a space that has been set, each of the chairs, a reinforcing speaker attached to emit a sound toward a listener sitting on a chair located on the rear side when viewed from the sound source side, The sound emitted from the reinforcing speaker is heard by the individual listeners as sound that reinforces the sound emitted from the sound source and directly reaching the individual listeners seated in the individual chairs, Control means for controlling the timing at which sound is emitted from the reinforcing speaker in accordance with the time required for the sound emitted from the sound source to directly reach the individual listeners. .
[0012]
In the acoustic device according to the first aspect of the present invention, chairs for a listener who listens to the sound emitted from the sound source are installed in a space in which a plurality of rows of chairs are arranged in the direction in which the sound source exists. Here, in the invention according to claim 1, a reinforcing speaker is provided in each of the chairs arranged in the space so as to emit a sound toward a listener sitting on a chair located on the rear side when viewed from the sound source side. Installed. The chair to which the reinforcing speaker is attached may be all chairs arranged in the space or some chairs, for example, chairs arranged in an area relatively far from the sound source. Or, a chair having another chair behind it as viewed from the sound source side may be used, a reinforcing speaker may be attached to a discrete row of chairs of a plurality of chairs, or a single row Also, the reinforcing speaker may be attached to each chair.
[0013]
The control means according to the first aspect of the present invention reinforces the sound (direct sound) emitted from the reinforcing speaker and emitted directly from the sound source and directly reaches individual listeners seated in individual chairs. The timing at which the sound is emitted from the reinforcing speaker so that each listener hears the sound as a sound (reinforcement sound) according to the time required for the sound emitted from the sound source to reach the individual listener directly Control. Thereby, the sound generated from the reinforcing speaker attached to the chair on the front side as viewed from the sound source side is heard as the reinforcing sound for each listener with respect to the chair on which the individual listener is seated. (Haas effect).
[0014]
As described above, according to the first aspect of the present invention, it is possible to listen at a position that is not easily affected by reverberation sound in the vicinity of the reinforcing speaker, and also to reduce the distance between the reinforcing speaker and the listener. Therefore, the volume of the sound emitted from the reinforcement speaker can be reduced, and the magnitude of the reverberation sound of the sound generated from the reinforcement speaker is significantly reduced. Clarity can be improved. In addition, most of the sound emitted from the reinforcing speaker is absorbed by a listener sitting on a chair before being reflected by a wall or ceiling, which may cause harmful echo and other acoustic disturbances. Nor. Furthermore, each chair faces the direction in which the sound source exists, and the reinforcing speaker attached to each chair emits a sound toward a listener sitting in a chair existing on the rear side when viewed from the sound source side. Therefore, for each listener, the difference between the arrival directions of the sound (direct sound) emitted from the sound source and the sound (reinforcement sound) generated from the reinforcing speaker is 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 heard by the listener. In addition, if the reinforcing speaker is attached in advance when the chair is manufactured, the arrangement of the reinforcing speaker in the space can be completed at the same time by arranging the chair in the space.
[0015]
In the invention described in claim 1, the reinforcing speaker is a backrest suitable for attaching the reinforcing speaker so as to emit a sound toward a listener sitting on a chair located on the rear side of the chair. Etc.) and concealed so as not to be seen from the outside. Thereby, the possibility that the reinforcing speaker is damaged by humans can be significantly reduced, and the appearance of the reinforcing speaker is completely unknown, so that the design of the chair can be prevented from being impaired. Therefore, it is desirable that the reinforcing speaker has a shape and a size that can be embedded and concealed in a predetermined portion of the chair.
[0016]
Further, in the invention according to claim 1, speakers having various known structures can be applied as the reinforcing speaker. For example, as described in claim 2, the acoustic diaphragm is vibrated by the piezoelectric vibrator. It is preferable to apply a speaker (for example, Japanese Utility Model Registration No. 3037167, Japanese Patent Application Laid-Open No. 2000-134682) configured to emit a sound. Since the speaker having the above configuration can be made extremely thin, as described above, it is possible to easily realize that the reinforcing speaker is buried in the backrest portion of the chair and concealed so as not to be seen from the outside. In addition, since the speaker composed of the piezoelectric vibrator and the acoustic diaphragm is particularly excellent in response to sound of about 200 Hz or more, it is preferable that the sound emitted from the reinforcing speaker mainly includes sound in this frequency band. The effect that the listener can hear with high reproducibility is also obtained.
[0017]
Further, 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, and the predetermined member is used as an acoustic diaphragm. It is preferable to generate sound by vibrating the piezoelectric vibrator. This eliminates the need to newly provide a member that acts as an acoustic diaphragm when attaching the reinforcing speaker to the chair, so that the reinforcing speaker can be embedded in the back even if the chair has a thin back. It becomes.
[0018]
Further, when a large number of chairs are arranged in the space where the acoustic device according to the first aspect of the present invention is installed, the control means controls the timing of generating sound from the reinforcing speaker to each chair. Although it may be configured such that each reinforcing speaker is performed as a unit, the desired timing of sound generation from the reinforcing speaker (the generation timing of the sound for causing the sound emitted from the reinforcing speaker to be heard as the reinforcing sound) ) Changes according to the time required for the sound emitted from the sound source to directly reach the individual listener, and the time is determined according to the distance from the sound source to the listener (the chair on which the listener is sitting). In consideration of this, for example, as described in claim 4, the individual groups when the multiple rows of chairs are divided into groups each including a plurality of rows of chairs according to the distance from the sound source are unitized. To, it is preferably configured to control the timing of generating a sound from the reinforcing speaker.
[0019]
According to the fourth aspect of the present invention, a large number of rows of chairs are divided into groups each composed of a plurality of rows of chairs according to the distance from the sound source, and the timing of generating sound from the reinforcing speaker is controlled on an individual group basis. As compared with the case where the control of the timing of generating the sound from the reinforcing speaker is performed for each reinforcing speaker as a unit, the configuration of the control means and, consequently, the acoustic device can be simplified.
[0020]
According to a fifth aspect of the present invention, there is provided an audio equipment, comprising: the audio device according to any one of the first to fourth aspects; a main speaker as the sound source; and an audio signal representing a sound to be emitted from the main speaker. Amplifying, comprising an amplifier to supply to the main speaker, the control means of the audio device, while delaying the audio signal and supplying it to the reinforcing speaker, by controlling the delay time of the audio signal, It is characterized in that timing for generating sound from the reinforcing speaker is controlled. According to a fifth aspect of the present invention, in addition to the main speaker and the amplifier, the audio device according to any one of the first to fourth aspects is provided. As in the present invention, it is possible to realize high quality sound heard by a listener.
[0021]
The building according to the invention according to claim 6, wherein a space in which a plurality of rows of chairs for a listener who listens to the sound emitted from the sound source are arranged in the direction in which the sound source exists is formed inside. The sound device according to any one of claims 1 to 4 or the sound equipment according to claim 5 is installed in the space. According to the sixth aspect of the present invention, 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 therein. As in the invention described in any one of the above items 5, it is possible to realize high sound quality of the sound heard by a listener in the space.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an acoustic device 10 according to the present embodiment. The acoustic device 10 is installed in an indoor space. In FIG. 1, as an example of the indoor space, a stage 12A on which the speaker 14 is located when a lecture or the like is performed, and a listener who listens to the lecture or the like are seated. The auditorium 12 comprises a seat space 12B in which a number of chairs 16 (see also FIG. 2) are arranged in a plurality of rows toward the stage 12A.
[0023]
When a lecture or the like is given in the auditorium 12, a microphone 18 for detecting a sound emitted by the lecturer 14 is provided on the stage 12A. The microphone 18 is connected to a preamplifier 20, and an audio signal representing a sound emitted by the speaker 14 is amplified by the preamplifier 20 and output. The output terminal of the preamplifier 20 is connected to three main speakers 26 disposed behind the stage 12A via three frequency correction circuits 22 and three amplifiers 24, respectively.
[0024]
On the other hand, as shown by a broken line in FIG. 2, each of the chairs 16 installed in the customer seat space 12B emits a sound toward a listener sitting on the chair 16 located on the rear side when viewed from the stage 12A side. Are buried at two positions on the left and right of the backrest 28, respectively. As shown in FIG. 3B, the backrest 28 of the chair 16 includes a cushion member 32 made of sponge or the like, a support member 34 that supports the cushion member 32, and a back member 36 that covers the back of the backrest 28. The gap is formed between the support member 34 and the back member 36.
[0025]
The reinforcing speaker 30 according to the present embodiment is configured such that a piezoelectric vibrator 38 disposed in a gap between the support member 34 and the back member 36 is attached to the back member 36. The piezoelectric vibrating body 38 has a circular piezoelectric element layer made of bimorph or the like formed on both sides, and when an audio signal is applied, vibrates at an amplitude corresponding to the voltage level of the applied audio signal. A circular hole (not shown) is formed 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 the circular hole. A male screw is formed in a portion of the mounting member 40 that passes through the piezoelectric vibrating body 38, and the female screw of the nut 42 is screwed to the male screw, so that the mounting member 40 is integrated with the piezoelectric vibrating body 38. Mounted on. The enlarged diameter portion 40A of the attachment member 40 is attached to the back member 36 with an adhesive or the like.
[0026]
An annular vibration control piece 44 is attached to one side surface of the piezoelectric vibrating body 38 along the outer peripheral edge. The vibration control 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 maximizes the diameter of the piezoelectric vibrator 38). Have been. The vibration control piece 44 acts as an inertial mass when the piezoelectric vibrating body 38 vibrates, and the portion of the piezoelectric vibrating body 38 to which the vibration control piece 44 is attached tends to stop at the original position. When an audio signal is applied to the piezoelectric vibrator 38, the center of the piezoelectric vibrator 38 mainly vibrates.
[0027]
When the central portion of the piezoelectric vibrator 38 vibrates, the vibration is transmitted to the back member 36 via the mounting member 40, so that the back member 36 also vibrates, and the vibration of the back member 36 causes the piezoelectric vibrator 38 to vibrate. Is radiated to the rear side when viewed from the stage 12A side. 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.
[0028]
The reinforcing speaker 30 is not limited to the configuration shown in FIG. 3B. For example, as shown in FIG. 4, the back member 36 that covers the back of the backrest 28 of the chair 16 is made thick, When the cushion member 32 is supported in close contact with the member 32, a notch 36A is formed in the back member 36, and the piezoelectric vibrator 38, the mounting member 40, and the nut are formed in the notch 36A. A configuration in which members such as the vibration control piece 42 and the vibration control piece 44 are housed and the opening of the notch 36A is closed by the lid member 46 may be adopted.
[0029]
As shown in FIG. 1, the large number of chairs 16 installed in the seating space 12B are divided into a plurality of groups each consisting of a plurality of rows of chairs (in FIG. 1, the groups are referred to as “blocks” and the blocks are referred to as “blocks”). A and B are shown), and a reinforcing speaker drive unit 50 is provided corresponding to each group (block). 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.
[0030]
Since the reinforcing speaker driving units 50 corresponding to the individual blocks have the same configuration, the configuration will be described below by taking the reinforcing speaker driving unit 50 corresponding to the block A as an example. The suppression unit 52, the delay circuit 54, the frequency correction circuit 56, and the amplifier 58 are sequentially connected, and the audio signal output from the preamplifier 20 is input to the howling suppression unit 52.
[0031]
The howling suppression unit 52 prevents howling from occurring by the microphone and the reinforcing speaker 30 when the microphone is brought into the audience space 12B, for example, when the listener asks a question to the speaker in the lecture. Howling to monitor whether the signal level in a specific frequency band of the input audio signal has exceeded a predetermined value, and lower the signal level when the signal level in the specific frequency band has exceeded a predetermined value. Perform suppression processing.
[0032]
In addition, the delay circuit 54 delays the audio signal input from the howling suppression unit 52 by a predetermined delay time Δt1. Although details will be described later, the delay time in the delay circuit 54 is different for each reinforcing speaker drive unit 50 corresponding to each block. The audio signal delayed by the delay circuit 54 is input to the frequency correction circuit 56, where the signal level is adjusted for each frequency band according to the frequency characteristics of the reinforcing speaker 30 and the like, and then amplified by the amplifier 58 to correspond. The power is supplied to all the reinforcing speakers 30 attached to all the chairs 16 belonging to the block.
[0033]
Next, the operation of the present embodiment will be described. When a lecture is given in the auditorium 12, the voice uttered by the speaker 14 at the time of the lecture is once converted into an audio signal by the microphone 18, temporarily amplified by the preamplifier 20, and then 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 according to the frequency characteristics of the main speaker 26, the sound field characteristics of the auditorium 12, and the like. The audio signal output from the frequency correction circuit 22 is supplied to the main speaker 26 after being amplified again by the amplifier 24.
[0034]
Thereby, the sound emitted by the speaker 14 is emitted as sound (sound wave) from the main speaker 26 toward the seating space 12B side, and the sound wave propagates in the auditorium 12 and each of the chairs in which the listener is seated By arriving at 16, sounds (sound waves) are heard by listeners seated in each chair 16. The main speaker 26 corresponds to the sound source described in claim 1.
[0035]
By the way, since the distance between the main speaker 26 and the listener is different for each individual listener depending on the position in the seating space 12B where the listener is seated, the sound ( The time from when the sound wave is emitted to when the sound wave propagates through the auditorium 12 to directly reach the position where the listener is seated and is heard as sound (direct sound) by the listener is also the main speaker 26. And the distance differs for each individual listener according to the distance between the listeners. Therefore, the optimum sound generation timing from the reinforcement speaker 30 (the sound generated by the reinforcement speaker 30 is made to be heard by the listener as the sound that directly reinforces the sound, due to the difference in the sound wave propagation time for each listener. For the individual listeners also differs for each individual listener.
[0036]
For this reason, in this embodiment, the large number of chairs 16 installed in the customer seat space 12B are divided into groups (blocks) each including 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 reinforcement speaker driving unit 50 corresponding to the block of the above, the sound generated from the reinforcement speaker 30 attached to each chair 16 in each block, the sound behind the chair 16 The sound is set so that the sound is directly reinforced by a listener sitting on the chair 16.
[0037]
Specifically, a main speaker 26 is provided for a block x (n and m are both integers, n <m) composed of the chairs 16 in the n-th row to the m-th row when viewed from the stage 12A side. Are measured for each of the chairs 16 in the (n + 1) -th to (m + 1) -th columns, and the average value tx of the measured direct sound propagation times is calculated. . The (n + 1) th column to the (m + 1) th column are based on the time difference Δt (for example, about 10 to 20 milliseconds) between the arrival timing of the optimal reinforcement sound and the arrival timing of the direct sound and the average value tx of the direct sound propagation time. A delay time in the delay circuit 54 of the reinforcement speaker driving unit 50 corresponding to the block x such that the sound generated from the reinforcement speaker 30 arrives at about Δt after the direct sound arrives at each chair 16 of the eyes. Is set for each of the delay circuits 54 of the reinforcing speaker drive unit 50 corresponding to each block.
[0038]
Thus, the sound generated by the main speaker 26 and directly arriving is perceived as a direct sound by the viewer seated in each chair 16 installed in the customer seat space 12B, and the chair 16 in which the viewer is seated is The sound emitted backward by the reinforcement speaker 30 of the chair 16 existing in front (the same sound as the sound generated by the main speaker 26) is perceived by the viewer as a reinforcement sound that reinforces the direct sound. Will be.
[0039]
As described above, in the present embodiment, the sound that is perceived as an augmentation sound by the individual listener is emitted from the chair 16 existing in front of the chair 16 in which the individual listener is seated. The distance between the listener and the source of the reinforcement sound (the reinforcement speaker 30 attached to the front chair 16 in the present embodiment) is small (this distance is substantially equal to the arrangement pitch P of the chair 16 (see FIG. 1). Usually P = about 0.9 to 1 m). Therefore, the sound can be heard in the vicinity of the speaker where the effect of the reverberation sound is small, and the sound pressure level of the sound to be generated by the reinforcing speaker 30 is small. The sound pressure level of the reverberating sound is also reduced. Further, in addition to the fact that the sound pressure level of the sound generated from the reinforcing speaker 30 is low, most of the sound is absorbed by a listener existing near the reinforcing speaker 30, so that the occurrence of echo is also avoided. be able to. Furthermore, it is clear that howling is suppressed when a microphone is brought into the seating space 12B, and the generation path is between the reinforcing speaker 30 located near the microphone and the microphone. Since it is not received, the erasure can be sufficiently performed by the processing contents of the howling suppression circuit 52. As a result, it is possible to improve the clarity of sound heard by individual listeners.
[0040]
In addition, since the reinforcement sound heard by each listener is generated from the reinforcement speaker 30 attached to the chair 16 located in front of the chair 16 in which each listener is seated, the individual reinforcement sound is generated. The reinforcement sound heard by the listener will come from substantially the same direction as the direct sound (ie, in front of the individual listener). As described above, for each listener, the difference between the arrival directions of the sound (direct sound) generated from the main speaker 26 and the sound (reinforcement sound) generated from the reinforcement speaker 30 is extremely small, and therefore, the direct sound Since the sense of direction is originally difficult to be disturbed, compared to the case where the arrival direction of the direct sound and the reinforcement sound is greatly different, the delay and the setting error of the level have less influence on the sense of direction of the direct sound, Control of the sound generated from the reinforcing speaker 30 is also simple.
[0041]
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, and the delay time may be controlled in units of individual listeners (individual chairs 16). . In this case, although the configuration of the acoustic device 10 is 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).
[0042]
In the above, the reinforcing speaker 30 according to the present invention has a configuration in which the back member 36 is vibrated by the piezoelectric vibrator 38 to emit sound toward a listener located behind the chair 16. However, the present invention is not limited to this, and instead of the back member 36, a configuration is adopted in which a dedicated acoustic diaphragm designed for emitting sound is vibrated. Alternatively, a more general dynamic speaker may be used instead of the reinforcing speaker 30. However, it is difficult to make these speakers thinner than the reinforcing speaker 30 described above, and there is a possibility that the design of the chair 16 may be impaired, or it may be difficult to embed in the chair 16. Therefore, it is desirable to employ the reinforcing speaker 30 or a configuration similar to the reinforcing speaker 30.
[0043]
【The invention's effect】
As described above, according to the first aspect of the present invention, a listener sitting on a chair that is located on the rear side when viewed from the sound source side is provided on individual chairs for a listener listening to the sound emitted from the sound source. The reinforcing speaker is attached so as to emit a sound toward, and the sound emitted from the reinforcing speaker reinforces the sound emitted from the sound source and directly reaching each listener seated in each chair. Since the timing at which sound is emitted from the reinforcing speaker is controlled in accordance with the time required for the sound emitted from the sound source to reach the individual listener directly so that the individual listener can listen to the sound, the listener This has an excellent effect that it is possible to realize high sound quality of the sound heard by the user.
[0044]
According to a second aspect of the present invention, in the first aspect of the invention, a speaker having a configuration that emits sound by vibrating an acoustic diaphragm with a piezoelectric vibrator is used as the reinforcing speaker. By attaching the speaker for use, it is possible to prevent the design of the chair from being impaired.
[0045]
According to a third aspect of the present invention, in the second aspect of the present invention, the piezoelectric vibrating body is embedded in a back of a chair, a predetermined member constituting the back of the chair is used as an acoustic diaphragm, and the predetermined member is formed of a piezoelectric vibrating body. Since sound is generated by vibrating, in addition to the above-described effects, there is an effect that even in a chair with a thin backrest, the reinforcing speaker can be embedded in the backrest.
[0046]
According to a fourth aspect of the present invention, in the first aspect of the invention, a plurality of chairs are divided into groups each consisting of a plurality of rows of chairs according to the distance from the sound source. Since the timing of generating sound from the speaker is controlled, there is an effect that the configuration of the control means (sound device) can be simplified in addition to the above effects.
[0047]
According to a fifth aspect of the present invention, there is provided the audio apparatus according to any one of the first to fourth aspects, a main speaker, and an amplifier for amplifying an audio signal and supplying the amplified audio signal to the main speaker. This has an excellent effect that it is possible to realize high sound quality of the sound heard by the user.
[0048]
According to a 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 therein, This has an excellent effect that it is possible to realize high sound quality of the sound heard by the listener.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a schematic configuration of an acoustic device according to an embodiment.
FIG. 2A is a front view and FIG. 2B is a rear view of the chair according to the present embodiment.
FIG. 3A is a side view of a chair according to the present embodiment, and FIG. 3B is a schematic sectional view showing an example of a reinforcing speaker attached to each chair.
FIG. 4 is a schematic sectional view showing another example of a reinforcing speaker attached to each chair.
[Explanation of symbols]
10 Acoustic equipment
16 chairs
18 microphone
26 Main speaker
30 Speaker for reinforcement
36 Back member
38 Piezoelectric vibrator
44 Vibration control piece
50 Reinforcement speaker drive unit

Claims (6)

A chair for seating a listener who listens to a sound emitted from a sound source is an acoustic device installed in a space arranged in a plurality of rows toward a direction in which the sound source exists,
A reinforcing speaker attached to each of the chairs so as to emit a sound toward a listener sitting on a chair located on the rear side as viewed from the sound source side,
The sound emitted from the reinforcing speaker is heard by the individual listeners as sound that reinforces the sound emitted from the sound source and directly reaching the individual listeners seated in the individual chairs, Control means for controlling the timing at which sound is emitted from the reinforcing speaker according to the time required for the sound emitted from the sound source to reach the individual listeners directly,
An acoustic device comprising: The acoustic device according to claim 1, wherein the reinforcing speaker is a speaker configured to emit sound by vibrating an acoustic diaphragm with a piezoelectric vibrator. The acoustic device according to claim 2, wherein the piezoelectric vibrator is buried in a backrest of the chair, and generates sound by vibrating a predetermined member constituting the backrest of the chair as the acoustic diaphragm. Many rows of chairs are arranged in the space,
The control means controls the timing of generating sound from the reinforcing speaker in units of individual groups when the multi-row chairs are divided into groups each including a plurality of rows of chairs according to the distance from the sound source. The acoustic device according to claim 1, wherein the acoustic device is controlled. An acoustic device according to any one of claims 1 to 4,
A main speaker as the sound source,
An amplifier that amplifies an audio signal representing a sound to be emitted from the main speaker and supplies the amplified signal to the main speaker,
The control unit of the audio device delays the audio signal and supplies the delayed audio signal to the reinforcement speaker, and controls a delay time of the audio signal to control a timing at which a sound is generated from the reinforcement speaker. A sound facility characterized by that. A space in which a plurality of rows of chairs for a listener who listens to a sound emitted from a sound source to be arranged in a direction in which the sound source exists is formed therein. A building, wherein the acoustic device according to any one of claims 4 to 7 or the acoustic equipment according to claim 5 is installed.

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