JP3699072B2 - Audio equipment, audio equipment and buildings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an audio device, audio equipment, and a building, and in particular, a space in which chairs for a listener who listens to sound emitted from a sound source are arranged in a plurality of rows in a direction in which the sound source exists. The present invention relates to an acoustic device and an acoustic facility installed in the building, and an acoustic device or a building where the acoustic facility is installed.
[0002]
[Prior art]
Audio equipment installed in an indoor space where a large number of listeners seated on a chair listen to sound, such as a conference room, a theater, or a lecture hall, is generally constructed using the Haas effect. With the Haas effect, humans perceive the direction (position) in which a sound source exists based on the direction of arrival of a sound (directly called) that is emitted directly from the sound source (directly) and This is a phenomenon in which a sound that arrives with a delay time of 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]
Note that a sound that arrives with a delay time shorter than 5 milliseconds from the direct sound acts to change the direction of the direct sound when the difference between the direct sound arrival direction and the delayed sound arrival direction is large. (Stereophonic principle) The sound that arrives with a delay time longer than 50 milliseconds from the direct sound is perceived as harmful echo (a phenomenon in which the same sound can be heard repeatedly) separated from the direct sound, or on the wall or ceiling. Since it is perceived as reverberation after being reflected many times, none is perceived as a reinforcing sound.
[0004]
For this reason, the acoustic equipment installed in the indoor space as described above distributes reinforcing speakers for generating sounds to be heard as a reinforcing sound by the listener in multiple locations on the walls and ceiling of the indoor space. The same sound as that 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 sound is heard by the listener as a reinforcing sound. It is configured to control the volume of sound and the delay amount of the timing for generating the sound.
[0005]
Patent Document 1 discloses, as a technique for causing a listener to perceive the direction of a sound source by delaying sound emitted from 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 has been 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.
[0006]
[Patent Document 1]
JP-A-10-126900 (page 5-6).
[0007]
[Problems to be solved by the invention]
However, in a relatively large indoor space where high-quality sound transmission is required, such as in a theater or a lecture hall, the sound heard by the listener is unclear even if the above-mentioned acoustic equipment is installed. There are many problems. In other words, the acoustic equipment as described above 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 inevitably increased as the installation space increases. Therefore, the sound pressure level of the sound generated from the reinforcing speaker is increased in order for the listener to listen to the sound generated from each reinforcing speaker as a certain level of reinforcing sound. I must do it.
[0008]
As the sound pressure level increases, the sound pressure level of the reverberant sound generated by the sound generated from the reinforcing speaker also increases, and as a result of the reverberant sound being superimposed directly on the sound and the reinforcing sound, the sound equipment was installed. In places other than the vicinity of the sound source and the reinforcing speaker (for example, within a few meters from the sound source) in the space, the direct sound and the reinforcing sound are distorted by superimposition of the reverberant sound, thereby ensuring the clarity of the listening sound. Difficult to do. Further, in the prior art, a general feature is that the direction deviation between the sound source and the reinforcing speaker as viewed from the listener is large, and in this case, the magnitude of the sound generated by the reinforcing speaker and the deviation of the delay amount from the appropriate values are different. However, it often changes the perception of the direction of the sound source and gives an unnatural impression.
[0009]
In addition, the number of speakers to be installed increases as the space for installing sound equipment increases, the number of listeners increases, the area (area) where listeners sit, etc., to obtain a sufficient reinforcing effect Therefore, extremely complicated control is required for the sound generated from the reinforcing speaker. In such a case, the control was originally simplified due to economic reasons, etc. Otherwise, the device is likely to become unstable, and not only does not perform its function sufficiently, but also howling and echoes that were not originally assumed There are many cases in which acoustic disturbances such as these are induced.
[0010]
The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain an acoustic device, an acoustic facility, and a building that can realize 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 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. Sound device installed in a designated space, each chairBy oscillating a predetermined member constituting the backrest of the chair as an acoustic vibration plate with a piezoelectric vibrator, embedded in the backrest ofSounds toward the listener sitting on the chair on the rear side as seen from the sound source sideComplementThe sound emitted from the strong speaker and the reinforcing speaker is heard by the individual listener as a sound that reinforces the sound emitted from the sound source and directly reaching the individual listener seated on the individual chair. 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. It is characterized by.
[0012]
  In the acoustic device according to the first aspect of the present invention, chairs on which a listener who listens to the sound emitted from the sound source is seated are installed in a space in which a plurality of rows are arranged in the direction in which the sound source exists. Here, in the invention according to claim 1, the individual chairs arranged in the spaceBy vibrating the predetermined member constituting the backrest of the chair as the acoustic diaphragm with the piezoelectric vibrator on the backrest of theSounds toward the listener sitting on the chair on the rear side as seen from the sound source sideComplementStrong speakerBurieding. Note that the reinforcing speakerBuriedThe chairs may be all the chairs arranged in the space or a part of the chairs, for example, chairs arranged in an area relatively far from the sound source or after being viewed from the sound source side A chair with other chairs on the side may be used, and reinforcing speakers are placed on the chairs in multiple rows.BuriedYou can also add reinforcement speakers to each chair in a single row.BuriedMay be.
[0013]
The control means according to the first aspect of the invention reinforces the sound (direct sound) that is emitted from the reinforcing speaker and directly reaches the individual listeners seated on the individual chairs. The sound is emitted from the reinforcing speaker so that it can be heard by each listener as a sound to be played (reinforcing sound) according to the time required for the sound emitted from the sound source to reach each listener directly. Control. As a result, the sound generated from the reinforcing speaker attached to the front chair as viewed from the sound source side is heard as a reinforcing sound for the individual listeners. (Haas effect).
[0014]
As described above, according to the first aspect of the present invention, in addition to being able to listen at a position that is not easily affected by reverberant sound in the vicinity of the reinforcing speaker, the distance between the reinforcing speaker and the listener can be reduced. Therefore, the volume of the sound emitted from the reinforcing speaker can be reduced, and the magnitude of the reverberant sound of the sound emitted from the reinforcing speaker is greatly reduced. The clarity of the image can be improved. In addition, most of the sound emitted from the reinforcing speaker is absorbed by the listener sitting on the chair before being reflected by the wall or ceiling, which can cause acoustic disturbances such as harmful echoes. Nor. Furthermore, the individual chairs face the direction in which the sound source exists, and the reinforcing speakers attached to the individual chairs emit sound toward the listener sitting on the chair existing on the rear side when viewed from the sound source side. Therefore, for each listener, the difference in arrival direction between the sound emitted from the sound source (direct sound) and the sound generated from the reinforcing speaker (reinforcing sound) 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 achieve high quality sound that is heard by the listener. If the reinforcing speaker is attached in advance when the chair is manufactured, the placement of the reinforcing speaker in the space can be completed at the same time by arranging the chair in the space.
[0015]
  AlsoIn the invention of claim 1IsReinforcing speakerTheChairBack ofMotaBecause it is buried in thisIt is possible to greatly reduce the possibility that the reinforcing speaker is damaged by human beings, and since the appearance of the reinforcing speaker is not known at all, it is possible to avoid the deterioration of the design of the chair.In the first aspect of the present invention, the reinforcing speaker employs a structure that emits sound by vibrating the acoustic diaphragm with a piezoelectric vibrating body, but this structure can be made extremely thin. It is also easy to embed a reinforcing speaker in the back of the chair and hide it from the outside. In addition, a speaker comprising a piezoelectric vibrator and an acoustic diaphragm is particularly 200 H z Excellent response to sound above a certain level, so that when the sound emitted from the reinforcing speaker mainly includes sound in this frequency band, the listener can listen with good reproducibility. It is done. Further, since the predetermined member constituting the back of the chair is used as the acoustic diaphragm, it is not necessary to newly provide a member that acts as the acoustic diaphragm when attaching the reinforcing speaker to the chair, and the thickness of the back is thin. Even in a chair, the reinforcing speaker can be embedded in the backrest.
[0016]
  The acoustic device according to the invention of claim 2 is provided in a space in which 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 plurality of rows of reinforcing speakers attached to individual chairs so as to emit sound toward a listener seated in a chair existing on the rear side as viewed from the sound source side; After a direct sound that reaches directly from the sound source arrives at each of the chairs, the arrived sound is heard as a reinforcement sound that reinforces the direct sound by individual listeners seated on each of the multiple rows of chairs The multiple rows of chairs are moved from the plurality of rows of chairs according to the distance from the sound source so that the sound emitted from the reinforcing speaker arrives at each of the rows of chairs at a timing when time elapses. Divided into groups The individual listener who seated the sound generated from the sound source on the individual chair, with the timing of the sound generated from the individual reinforcing speakers corresponding to the individual chairs in the group as a unit And a control means for delaying each by a delay time set on the basis of the average value of the time required to reach the direct sound and the predetermined time.
[0017]
  In the acoustic device according to the second aspect of the present invention, chairs on which a listener who listens to the sound emitted from the sound source is seated are installed in a space in which multiple rows are arranged in the direction in which the sound source exists. Here, in the invention according to claim 2, the reinforcing speaker is provided so that the individual chairs arranged in the space emit a sound toward the listener sitting on the chair existing on the rear side when viewed from the sound source side. It is attached. In the invention according to claim 2, the chair to which the reinforcing speaker is attached may be all the chairs arranged in the space, or a part of the chair, similarly to the invention according to claim 1. For example, it may be a chair arranged in an area relatively far from the sound source, or a chair with other chairs on the rear side when viewed from the sound source side, and a row of multiple rows of chairs. Reinforcing speakers may be attached to the chairs, or reinforcing speakers may be attached to each chair in a single row.
[0018]
  The control means according to the second aspect of the present invention provides the individual listening device in which the incoming sound is seated on each of the multiple rows of chairs after the direct sound arrives directly from the sound source to each of the multiple rows of chairs. Multiple rows of chairs from the sound source so that the sound emitted from the reinforcing speakers arrives at each of the multiple rows of chairs at the time when a predetermined time is heard as a reinforcement sound that directly reinforces the sound to the user. Individual reinforcing speakers corresponding to individual chairs in the group (for listeners sitting on individual chairs), with each group as a unit divided into groups of chairs of multiple rows according to distance The timing at which sound is emitted from the reinforcing speaker (located in front of each chair as seen from the sound source side) so that the sound is emitted to each listener who is seated in the individual chair. Direct sound And based on the predetermined time and the average value of the time required to reach to only each delay a delay time which is set. As a result, the sound generated from the reinforcing speaker attached to the front chair as viewed from the sound source side is heard as a reinforcing sound for the individual listeners. (Haas effect).
[0019]
  As described above, in the invention described in claim 2, as in the invention described in claim 1, the clarity of the sound heard by the listener can be improved, and acoustic disturbance such as harmful echo is induced. There is nothing. Furthermore, the individual chairs face the direction in which the sound source exists, and the reinforcing speakers attached to the individual chairs emit sound toward the listener sitting on the chair existing on the rear side when viewed from the sound source side. Therefore, for each listener, the difference in arrival direction between the sound emitted from the sound source (direct sound) and the sound generated from the reinforcing speaker (reinforcing sound) is very small, and the sense of direction of the sound source is not impaired. Therefore, also in the second aspect of the invention, it is possible to realize high quality sound to be heard by the listener. If the reinforcing speaker is attached in advance when the chair is manufactured, the placement of the reinforcing speaker in the space can be completed at the same time by arranging the chair in the space.
  Furthermore, in the invention according to claim 2, the multiple 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 same reinforcement speakers corresponding to the individual chairs in the same group are used. Control is made so that sound is emitted at the same timing, and the control of the timing for generating sound from the reinforcing speaker is simpler than when the individual reinforcing speaker attached to each chair is used as a unit. Thus, it is possible to realize simplification of the configuration of the control means, and consequently the acoustic device.
[0020]
  Claim3The acoustic equipment according to the described invention is the first aspect.OrClaim2An audio signal representing a sound to be emitted from the main speaker and supplying the sound signal to the main speaker, and the control means of the audio device includes the audio A signal is delayed and supplied to the reinforcing speaker, and a delay time of the audio signal is controlled to control timing for generating sound from the reinforcing speaker. Claim3In addition to the main speaker and the amplifier, the invention described in claim 1OrClaim21 is provided.OrClaim2As with the invention described above, it is possible to achieve high quality sound that is heard by the listener.
[0021]
  Claim4The building according to the invention described is formed with a space in which a chair for a listener who listens to a sound emitted from a sound source is arranged in a plurality of rows in a direction in which the sound source exists, In the space, claim 1OrClaim2On-board acoustic device or claim3It is characterized in that the described audio equipment is installed. Claim4In the described invention, the space formed inside is claimed in claim 1.OrClaim2On-board acoustic device or claim3The sound equipment according to claim 1 is installed.3As in any of the inventions described in any one of the above, it is possible to improve the quality of the sound heard by the listener in the space.
[0022]
DETAILED DESCRIPTION OF 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 where the speaker 14 is located and a listener who listens to the lecture are seated when giving a lecture. The auditorium 12 is composed of a passenger seat space 12B in which a plurality of chairs 16 (see also FIG. 2) are installed in a plurality of rows toward the stage 12A.
[0023]
When a lecture or the like is performed in the auditorium 12, a microphone 18 for detecting the 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 sound uttered by the speaker 14 is amplified and output by the preamplifier 20. The output terminal of the preamplifier 20 is connected to three main speakers 26 installed 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 chair 16 installed in the passenger seat space 12B emits a sound toward the listener sitting on the chair 16 existing on the rear side when viewed from the stage 12A side. The reinforcing speakers 30 are embedded in two places on the left and right sides of the backrest portion 28, respectively. As shown in FIG. 3B, the backrest portion 28 of the chair 16 includes a cushion material 32 made of sponge or the like, a support member 34 that supports the cushion material 32, and a back surface member 36 that covers the back surface of the backrest portion 28. A 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 by attaching a piezoelectric vibrating body 38 disposed in the gap between the support member 34 and the back member 36 to the back member 36. The piezoelectric vibrating body 38 is circular and has piezoelectric element layers made of bimorph or the like formed on both sides thereof. When an audio signal is applied, the piezoelectric vibrating body 38 vibrates with 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 a diameter-enlarged portion 40A formed at one end passes through 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 into the male screw, so that the mounting member 40 is integrated with the piezoelectric vibrating body 38. Installed 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 vibrating body 38 (that is, a size that maximizes the diameter of the piezoelectric vibrating body 38). Has been. The vibration control piece 44 acts as an inertial mass body when the piezoelectric vibrating body 38 vibrates, and the portion of the piezoelectric vibrating body 38 to which the vibration control piece 44 is adhered tends to stop at the original position. When an audio signal is applied to the piezoelectric vibrating body 38, the central portion of the piezoelectric vibrating body 38 mainly vibrates.
[0027]
When the central portion of the piezoelectric vibrating body 38 vibrates, the vibration is transmitted to the back member 36 via the attachment member 40, so that the back member 36 also vibrates, and the vibration of the back member 36 causes the piezoelectric vibrating body 38 to vibrate. The sound represented by the audio signal applied to is radiated rearward as 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 thick, and the cushion 30 When the structure is in close contact with the material 32 to support the cushion material 32, a notch 36A is formed in the back member 36, and the piezoelectric vibrating body 38, the mounting member 40, and the nut are formed in the notch 36A. 42, the vibration control piece 44 and the like may be accommodated, and the opening of the notch 36A may be closed by the lid member 46.
[0029]
As shown in FIG. 1, a large number of chairs 16 installed in the passenger seat space 12B are divided into a plurality of groups each composed of a plurality of rows of chairs (in FIG. 1, the group is expressed as “block”, and the block Reinforcing speaker driver 50 is provided corresponding to each group (block). The reinforcing speaker 30 attached to the chair 16 belonging to a 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 of the reinforcing speaker driving unit 50 corresponding to the block A will be described below 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 the occurrence of howling by the microphone and the reinforcing speaker 30 when a microphone is brought into the seat space 12B, for example, when a listener asks the speaker a question during a lecture. Therefore, howling is performed to monitor whether or not the signal level in a specific frequency band of the input audio signal exceeds a predetermined value, and to reduce the signal level when the signal level in the specific frequency band exceeds a predetermined value. Perform suppression processing.
[0032]
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 driving unit 50 corresponding to each block. The audio signal delayed by the delay circuit 54 is input to the frequency correction circuit 56, the signal level is adjusted for each frequency band in accordance with the frequency characteristics of the reinforcing speaker 30, etc., and then amplified by the amplifier 58 to correspond. The signals are supplied to all the reinforcing speakers 30 attached to all the chairs 16 belonging to the block.
[0033]
Next, the operation of this embodiment will be described. When a lecture is given at the lecture hall 12, the voice uttered by the speaker 14 at the time of the lecture is once converted into a voice signal by the microphone 18, amplified once 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 amplified again by the amplifier 24 and then supplied to the main speaker 26.
[0034]
As a result, the sound uttered by the speaker 14 is emitted as sound (sound wave) from the main speaker 26 toward the audience space 12B, and the sound wave propagates through the auditorium 12 and each chair is seated by the listener. By arriving at 16, sound (sound wave) is heard by each listener seated in each chair 16. The main speaker 26 corresponds to the sound source described in claim 1.
[0035]
By the way, the distance between the main speaker 26 and the listener is different for each listener depending on which position in the seat space 12B the listener is seated. The time from when the sound wave is emitted until the listener reaches the position where the listener is seated and is heard as a sound (direct sound) by the listener is also the main speaker 26. And different for each listener depending on the distance of the listener. Therefore, due to the difference in the sound wave propagation time for each listener, the optimal sound generation timing from the reinforcing speaker 30 (the sound generated by the reinforcing speaker 30 is heard by the listener as a sound that directly reinforces the sound. (Timing) for each listener is also different.
[0036]
For this reason, in this embodiment, a large number of chairs 16 installed in the passenger seat space 12B 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 calculated based on the sound generated from the reinforcing speaker 30 attached to each chair 16 in each block. It is set so that the listener who is seated in the chair 16 can listen to the sound directly as a sound.
[0037]
Specifically, when viewed from the stage 12A side, the main speaker 26 is applied to a block x (n and m are integers, n <m) composed of the chair 16 in the n-th row to the chair in the m-th row. Is measured for each chair 16 in the (n + 1) -th column to the (m + 1) -th column, and the average value tx of the measured direct sound propagation time is calculated. . Then, based on the time difference Δt (for example, about 10 ms to 20 ms) of the optimal reinforcement sound arrival timing with respect to the direct sound arrival timing and the average value tx of the direct sound propagation time, the (n + 1) th column to the (m + 1) th 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 about Δt after the direct sound arrives at each chair 16 of the eyes. Is set for each delay circuit 54 of the reinforcing speaker driver 50 corresponding to each block.
[0038]
As a result, the viewer who is seated in each chair 16 installed in the passenger seat space 12B perceives the direct sound generated by the main speaker 26 as a direct sound and the chair 16 where the viewer is seated. The sound emitted backward by the reinforcing speaker 30 of the chair 16 existing in the front (the same sound as the sound generated by the main speaker 26) is perceived by the viewer as a reinforcing sound that directly reinforces the sound. It will be.
[0039]
Thus, in this embodiment, since the sound perceived as a reinforcement sound by the individual listener is emitted from the chair 16 existing in front of the chair 16 where the individual listener is seated, The distance between the listener and the source of the reinforcing sound (in this embodiment, the reinforcing speaker 30 attached to the front chair 16) 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 that is originally affected by the reverberant sound, and the sound pressure level of the sound that should be generated by the reinforcing speaker 30 can be reduced. The sound pressure level of the reverberant sound is also reduced. Further, in addition to the low sound pressure level of the sound generated from the reinforcing speaker 30, most of the sound is absorbed by the listener existing in the vicinity of the reinforcing speaker 30, thereby avoiding the induction of echoes. be able to. Further, it is clear that the suppression of howling when a microphone is brought into the passenger seat space 12B is between the reinforcing speaker 30 and the microphone located in the vicinity of the microphone. Therefore, it can be sufficiently erased depending on the processing contents of the howling suppression circuit 52. As a result, it is possible to improve the clarity of sounds heard by individual listeners.
[0040]
Further, since the reinforcement sound heard by each listener is generated from the reinforcement speaker 30 attached to the chair 16 positioned in front of the chair 16 on which the individual listener is seated, The reinforcement sound heard by the listener comes from the same direction as the direct sound (ie, in front of the individual listener). As described above, since the difference in the arrival direction between the sound generated from the main speaker 26 (direct sound) and the sound generated from the reinforcing speaker 30 (reinforcing sound) is very small for individual listeners, The sense of direction is inherently difficult to disrupt, and the delay and level setting errors have less impact on the direct sound direction than when the direct sound and the direction of arrival of the reinforcement sound are significantly different. Control over the sound generated from the reinforcing speaker 30 is simple.
[0041]
In addition, although the example which controls delay time per block was demonstrated above, it is not limited to this, You may make it control delay time for each listener (individual chair 16) as a unit. . 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 description, the reinforcing speaker 30 according to the present invention is configured to radiate sound toward the listener existing on the rear side of the chair 16 by vibrating the back member 36 by the piezoelectric vibrating body 38. 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 to radiate 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 risk that the design of the chair 16 may be impaired or embedded in the chair 16. Therefore, it is desirable to adopt a configuration similar to the reinforcing speaker 30 or the reinforcing speaker 30.
[0043]
【The invention's effect】
  As described above, the invention according to claim 1 is an individual chair on which a listener who listens to a sound emitted from a sound source is seated.By vibrating the predetermined member constituting the backrest of the chair as the acoustic diaphragm with the piezoelectric vibrator on the backrest of theSounds toward the listener sitting on the chair on the rear side as seen from the sound source sideComplementPowerful speakersBuried, So that the sound emitted from the reinforcing speaker is heard by the individual listener as a sound that reinforces the sound emitted from the sound source and directly reaching the individual listener seated on the individual chair. The timing at which the sound is emitted from the speaker is controlled according to the time required for the sound emitted from the sound source to reach each listener directly, so that the quality of the sound heard by the listener can be improved.In addition, even for a chair with a thin backrest, it is possible to easily embed a reinforcing speaker in the back of the chair so as not to be seen from the outside without impairing the design of the chair., Has an excellent effect.
[0044]
  According to the second aspect of the present invention, a sound is sent to an individual chair for a listener who listens to a sound emitted from a sound source to a listener who sits on a chair existing on the rear side as viewed from the sound source side. Reinforcing speakers are attached so that the direct sound coming directly from the sound source arrives at each of the multiple rows of chairs, and then the incoming sound is directly emitted to individual listeners seated on each of the multiple rows of chairs. Each of the multiple rows of chairs according to the distance from the sound source so that the sound emitted from the reinforcing speakers arrives at each of the multiple rows of chairs at the timing when a predetermined time heard as a reinforcing sound to be reinforced has passed. With each group when divided into groups of chairs in multiple rows as a unit, the timing at which sound is emitted from each reinforcing speaker corresponding to each chair in the group, the sound emitted from the sound source is individual Chair Since the delay time set based on the average value of the time required to reach each seated individual listener as a direct sound and the predetermined time is delayed, the sound quality of the sound heard by the listener can be improved. At the same time, there is an excellent effect that the configuration of the control means (sound device) can be simplified.
[0047]
  Claim3The invention described in claim 1OrClaim2The above-described acoustic apparatus, the main speaker, and the amplifier that amplifies the audio signal and supplies the amplified audio signal to the main speaker have an excellent effect that the quality of the sound heard by the listener can be improved.
[0048]
  Claim4The invention described in claim 1 is provided in a space formed therein.OrClaim2On-board acoustic device or claim3Since the described acoustic equipment is installed, it has an excellent effect that it is possible to realize high quality sound that is heard by a listener in the space.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a schematic configuration of an acoustic device according to an embodiment.
2A is a front view and FIG. 2B is a rear view of a chair according to the present embodiment.
3A is a side view of a chair according to the present 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 sectional view showing another example of a reinforcing speaker attached to each chair.
[Explanation of symbols]
10 Audio equipment
16 Chair
18 Microphone
26 Main speaker
30 Speaker for reinforcement
36 Back member
38 Piezoelectric vibrator
44 Vibration control piece
50 Reinforcing speaker drive

Claims (4)

A chair on which a listener who listens to a sound emitted from a sound source is seated is an acoustic device installed in a space arranged in a plurality of rows in a direction in which the sound source exists,
To a listener who sits on a chair that is embedded in the backrest of each chair and is seated on the backside as seen from the sound source side by vibrating a predetermined member that constitutes the backrest of the chair as an acoustic diaphragm with a piezoelectric vibrator . and reinforcement speaker that Hassu the sound towards,
The sound emitted from the reinforcing speaker is heard by the individual listener as a sound that reinforces the sound emitted from the sound source and directly reaching the individual listener seated on the individual chair. 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 reach the individual listeners directly;
An acoustic device comprising: A chair on which a listener who listens to a sound emitted from a sound source is seated is an acoustic device installed in a space arranged in multiple rows in a direction in which the sound source exists,
Reinforcing speakers attached to individual chairs so as to emit sound toward a listener seated on a chair existing on the rear side as viewed from the sound source side;
As a reinforcement sound that reinforces the direct sound to individual listeners seated on each of the multiple rows of chairs after the direct sound that directly arrives from each of the sound sources arrives at each of the multiple rows of chairs A plurality of the multiple rows of chairs according to the distance from the sound source so that the sound emitted from the reinforcing speaker arrives at each of the multiple rows of chairs at a timing when a predetermined time has been heard. With the individual groups when divided into groups of chairs in a row as a unit, the timing at which sound is emitted from the individual reinforcing speakers corresponding to the individual chairs in the group, the sound emitted from the sound source is the individual A control means for delaying each of the individual listeners seated in the chair by an average value of the time required for reaching the direct sound and a delay time set based on the predetermined time ;
An acoustic device comprising: The acoustic device according to claim 1 or 2,
A main speaker as the sound source;
An amplifier that amplifies an audio signal representing sound to be emitted from the main speaker, and supplies the amplified signal to the main speaker;
The control means of the acoustic device delays the audio signal and supplies the audio signal to the reinforcing speaker, and controls the timing of generating sound from the reinforcing speaker by controlling the delay time of the audio signal. Sound equipment characterized by that. A chair in which a listener who listens to a sound emitted from a sound source is seated is formed in a space in which a plurality of rows are arranged in a direction in which the sound source exists, and the space is formed in the space. A building comprising the acoustic device according to claim 2 or the acoustic equipment according to claim 3.

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