JP2006133262A - Room acoustic generating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain sound field effect having spatial feeling and sound spreading in a small-scale space such as a music practice soundproof room. <P>SOLUTION: The soundproof room 10 not exceeding 1-4 mats comprises arranging speakers S<SB>11</SB>and S<SB>12</SB>outward at a corner position making an opposite angle at an upper part respectively, arranging microphones M<SB>1</SB>and M<SB>2</SB>at the other corner position making an opposite angle at the upper part respectively, and arranging speakers S<SB>12</SB>and S<SB>22</SB>inward at a corner part making an opposite angle at a height of 1-1.5 m from a floor face more downward than that of the speakers S<SB>11</SB>and S<SB>21</SB>respectively. The speakers S<SB>11</SB>and S<SB>12</SB>are connected in a reverse phase, and the speakers S<SB>21</SB>and S<SB>22</SB>are also same. A first signal processing channel forms an initial reflection sound signal and an indirect sound signal such as an acoustic sound signal on the basis of a sound signal from the microphone M<SB>1</SB>to be supplied to the speakers S<SB>11</SB>and S<SB>12</SB>. A second signal processing channel similarly forms the indirect sound signal on the basis of a sound signal from the microphone M<SB>2</SB>to be supplied to the speakers S<SB>21</SB>and S<SB>22</SB>. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a room sound generation apparatus suitable for use in a small-scale space such as a soundproof room for music practice.

  Conventionally, as an indoor sound generation device, speakers from four groups (12 per group, three) are installed on the indoor ceiling and two microphones provided on the indoor ceiling (or upper front and rear inner wall surfaces) are used. It is known that a reverberation effect is obtained by forming a 4-channel reverberation signal based on a sound signal and supplying the reverberation sound signal to four groups of speakers (see, for example, Patent Document 1). In this case, it is also known that four additional speakers are installed at four corners in the vicinity of the floor surface, and a four-channel reverberation signal is supplied to each of the four additional speakers to increase the reverberation feeling (patent). Reference 1).

On the other hand, as another indoor sound generation apparatus, one microphone is installed on the ceiling of the room and one speaker is installed downward on the floor of the room, and is initially reflected by the processing unit based on the sound signal from the microphone. There is known one that generates room sound including indirect sound by forming an indirect sound signal such as a sound signal and a reverberation sound signal and supplying the indirect sound signal to a speaker (see, for example, Patent Document 2).
US Pat. No. 5,525,765 US Pat. No. 5,559,891

  According to the above-described 4-channel indoor sound generation device, 12 speakers are installed on the ceiling of the room and two microphones are provided near the speaker group, so that the distance between the microphone and the speaker is short and stable. The loudspeaker gain cannot be increased. Even if four additional speakers are provided at four corners near the floor, the sound propagation direction is limited to the direction from the ceiling to the floor and the direction near the floor and parallel to the floor. In addition, since only the reverberation sound is generated as a generated sound, a listener such as a musical instrument player does not feel the sound spread like a performance hall. Therefore, it is difficult to obtain a sound field effect with a sense of space and a feeling of sound expansion, and if an attempt is made to enhance the sound field effect, there is a risk of sound quality degradation such as coloration and howling. In addition, since the number of speakers is as large as 12 or 16, there are problems that the cost is high and the workability is not good.

  According to the above-described one-channel indoor sound generation device, although indirect sounds such as initial reflected sound and reverberation sound can be generated, there is only one channel of processing unit, and one speaker provided downward on the floor as a speaker. Therefore, it is difficult to obtain a sufficient sound field effect.

  An object of the present invention is to provide a novel indoor sound generation device capable of obtaining a sound field effect with a sense of space and a feeling of sound expansion with a small number of speakers.

An indoor sound generation device according to the present invention includes:
A room sound generation device that generates room sound including indirect sound based on sound generated in a room,
A plurality of first speakers respectively provided outward at positions spaced apart from each other in the upper part of the room;
A plurality of second speakers provided inwardly at positions spaced apart from each other below the plurality of first speakers and above the floor surface in the room, the plurality of first speakers; Each pair is formed, and each pair is connected to the first speaker so that the second speaker is in reverse phase,
A plurality of microphones provided to receive the sound spaced apart from each other on one or a plurality of surfaces or ridge lines of front, rear, left and right wall surfaces, ceiling surfaces and floor surfaces in the room;
A processing unit having a plurality of signal processing channels corresponding to a plurality of sets formed by the plurality of first and second speakers and corresponding to the plurality of microphones, respectively, each microphone corresponding to each signal processing channel An indirect sound signal is formed on the basis of the sound signal from and supplied to the corresponding first and second speakers, and the room is connected via the plurality of first and second speakers. It generates sound.

  According to the indoor sound generation device of the present invention, since the plurality of first speakers are provided outward at positions separated from each other in the upper part of the room, the sound is widely distributed in the room for each first speaker. Can be passed. In the room, a plurality of second speakers are placed inward at positions spaced apart from each other below the first speaker and above the floor (preferably at a height in the range of about 1 to 1.5 m). Since it is provided, the position of the sound image can be lowered by the second speaker, and the feeling of sound expansion is further increased. Furthermore, a plurality of second speakers are grouped with a plurality of first speakers, and a sound image for each group is obtained by connecting the second speaker to the first speaker so as to have an opposite phase for each group. Since the localization is obscured, the sound field effect is less directional. In addition, an indirect sound signal such as an early reflection sound signal and a reverberation sound signal is formed using a plurality of microphones and a plurality of signal processing channels, and the first and second sets of indirect sound signals corresponding to each signal processing channel are formed. Since the sound is supplied to the two speakers, it is possible to further increase the sense of sound expansion and to give the listener a sense of space according to the scale of the performance hall or the like. Therefore, even if the room is a small space with a sense of pressure and obstruction like a soundproof room for music practice, it is possible to obtain a sound field effect with a sense of space and a feeling of sound expansion like a performance hall. . The number of speakers may be at least four if the number of channels is two, and may be at least eight if the number of channels is four.

  In the indoor sound generation device according to the present invention, it is preferable that the plurality of first speakers are respectively provided at corner positions that form a diagonal in the upper part of the room. The corner position that forms the diagonal in the upper part of the room is the place where the effect is maximum as a speaker installation place (directivity coefficient Q≈8), and all the vibration modes in the room are excited. Therefore, the feeling of sound expansion is the best.

  As described above, when a plurality of first speakers are provided at corner positions that are diagonal in the upper part of the room, the plurality of second speakers are set to the installation positions of the plurality of first speakers in the room. It is preferable that each corner is provided at a corner position other than the corresponding corner. If it does in this way, the 1st and 2nd speaker can be widely disperse | distributed and arrange | positioned in a room, and a feeling of sound expansion can be improved.

  As described above, when a plurality of first speakers are provided at diagonal corners in the upper part of the room, a plurality of microphones correspond to the installation positions of the plurality of first speakers in the upper part of the room. It is preferable to provide each at a corner position that forms a diagonal other than the corner to be performed. The diagonal corner position in the upper part of the room is a place where the sound pressure is high in all vibration modes of the room, and dip at a specific frequency due to the vibration mode is unlikely to occur, so it is optimal as a microphone installation location. .

  According to the present invention, since the speaker arrangement as described above is devised and the indirect sound generation is made into a plurality of channels, a sound field effect with a sense of space and a feeling of sound expansion can be obtained in a small-scale space. In addition, since the number of speakers is small, the cost can be reduced and the workability can be improved.

  FIG. 1 shows a soundproof room for music practice in which a room acoustic generator according to an embodiment of the present invention is used. The cross section along the line AA ′ is shown in FIG. 2 and the line BB ′. The cross section along the line is shown in FIG. 3, the vertical cross section along the line CC ′ is shown in FIG. 4, and the vertical cross section along the line DD ′ is shown in FIG.

The soundproof room 10 includes a rectangular parallelepiped performance space surrounded by a floor 12, a front wall 14, a rear wall 16, a right wall 18, a left wall 20, and a ceiling 22. The floor 12, the front and rear walls 14 to 20, and the ceiling 22 are all constituted by sound insulation panels incorporating a sound absorbing material. A door DR made of a sound insulation panel similar to that of the front wall 14 is attached to the front wall 14 so as to be openable and closable, and a glass window WD is provided on the door DR. The right wall 18 and left wall 20, a glass window WD ₁ and WD _2, respectively. The glass windows WD, WD ₁ , and WD ₂ are all configured to suppress vibrations by suppressing the resonance of the glass portion.

  The sound insulation performance of the soundproof room 10 is set so that, for example, a piano sound of about 90 dB is about 60 dB (about “human voice”) or less outside even if a piano is played in the performance space. In the performance space, the average sound absorption rate of piano sound is about 0.25 to 0.35, and it is closer to “dead” than the average sound absorption rate of around 0.1 in a general residential vacancy (western room) (echo generation) Is suppressed).

  As an example, the width of the floor 12 is about 1 to 4 tatami mats, and the indoor dimensions are a width W of 1654 mm, a depth K of 2536 mm, and a height H of about 1747 mm. A sound reflective panel can be attached to the inner surfaces of the walls 14 to 20 as necessary to adjust the live / dead feeling.

As shown in FIGS. 1, 2, 4, and 5, the speakers S ₁₁ and S ₂₁ are arranged outward (in the corner direction where three ridge lines intersect) at diagonal corner positions in the upper part of the soundproof room 10. Is done. Further, omnidirectional (or directional) microphones M ₁ and M ₂ are arranged at corner positions other than the corner corresponding to the installation positions of the speakers S ₁₁ and S ₂₁ , respectively. The sound signals from the microphones M ₁ and M ₂ are converted into 2-channel indirect sound signals, as will be described later, and these 2-channel indirect sound signals are supplied to the speakers S ₁₁ and S ₂₁ , respectively.

As shown in FIGS. 1, 3, 4, and 5, in the soundproof room 10, the speaker S ₁₁ is located at a corner position below the speakers S ₁₁ and S ₂₁ and diagonally at a predetermined height h from the surface of the floor 12. ₁₁ and S ₂₁ , speakers S ₁₂ and S ₂₂ are respectively arranged inwardly (in the direction of the wall facing the wall to be installed) at a corner position different from the corner corresponding to the installation position of S ₂₁ and S ₂₁ . Speaker _{S 12, S 22} are intended to respectively form a speaker _{S 11, S 21} and set, is connected to each opposite phases to the speaker _{S 11, S 21.}

The speakers S ₁₁ , S ₂₁ , S ₁₂ , and S ₂₂ can all be arranged by a support method using a support column, a mounting method using a metal fitting, or an adhesive method using a tape, and the same applies to the microphones M ₁ and M _2. Can be arranged. The height h from the surface of the floor 12 to the center of the speaker is preferably set within a range of about 1 to 1.5 m. As the speakers S ₁₁ , S ₂₁ , S ₁₂ , and S ₂₂ , a full range having a diameter of 10 cm or less is used as an example.

FIG. 6 shows an indoor sound generation device used in the soundproof room 10, and this device receives the sound generated in the soundproof room 10 from the microphones M ₁ and M ₂ and the microphones M ₁ and M ₂ . Signal processing channels SP ₁ and SP ₂ that receive sound signals as input, speakers S ₁₁ and S ₁₂ connected to the signal processing channel SP ₁ , and speakers S ₂₁ and S ₂₂ connected to the signal processing channel SP ₂ And a controller CNT for controlling the operation of the signal processing channels SP ₁ and SP ₂ .

Signal processing channel _SP 1, SP _2, the initial reflected sound signal based on the sound signal from the microphone _M 1, _{M 2,} respectively, and forms an indirect sound signal such as a reverberant sound signal, from the channel SP ₁ and SP ₂ Indirect sound signals are supplied to a set of speakers S ₁₁ and S _{12 and} a set of speakers S ₂₁ and S ₂₂ , respectively. Speaker S ₁₂ is connected in series such that the opposite phase to the speaker S _11, the speaker S ₂₂ are connected in series so as to be opposite phase to the speaker S _21. The speakers S ₁₁ and S ₁₂ may be connected in parallel so as to be in opposite phases. The same applies to the speakers S ₂₁ and S ₂₂ .

The controller CNT includes a display DP made of liquid crystal or LED (light emitting diode), operating elements AS, FC, VR, SW, etc., a readable / writable data memory DM, a recording terminal _JR, and a reproduction terminal _JP . An interface IF ₁ dedicated to MIDI (Musical Instrument Digital Interface) and a general-purpose interface IF ₂ such as RS-232C are provided. A MIDI format controller MD can be connected to the interface IF ₁ , and a personal computer (PC) format controller PN can be connected to the interface IF ₂ .

The signal processing channels SP ₁ and SP ₂ have the same configuration, and the configuration of the channel SP ₁ will be described with reference to FIG. 7 as a representative. Sound signal from the microphone M ₁ is amplified by the head amplifier (AMP) 30 is supplied to an A / D (analog / digital) converter 32 to be converted into sound signal in digital form. The digital sound signal from the A / D converter 32 is supplied to the initial delay circuit 34.

FIG. 8 shows the relationship between level and generation timing for various sounds in the performance hall. T _S is a sound source sound of musical instruments, such as the user to play, referred to as the source sound. The source sound T _S generated at the time T _S is heard as a direct sound Td in the user's ear without passing through a reflection path such as a wall. The initial reflected sound Ti is a reflected sound that is heard with a delay of the initial delay time t ₁ from the direct sound Td, and the reverberant sound Tr is heard with a delay time t ₂ from the first sound in the initial reflected sound group. It is a repetitive reflected sound that gradually attenuates. The initial reflected sound Ti and the reverberant sound Tr are referred to as indirect sounds with respect to the direct sound Td.

In the signal processing channel SP ₁ in FIG. 7, in order to simulate a sound field effect such as a performance hall, an initial reflected sound signal and a reverberation sound signal are formed as an indirect sound signal based on the sound signal from the microphone M ₁ . The initial delay circuit 34 gives a delay corresponding to the initial delay time t ₁ to the sound signal from the A / D converter 32. Since the initial delay time t ₁ changes according to the hole size, liveness, etc., the initial delay circuit 34 is supplied with a control signal CS _{1 in} order to control the delay time. The sound signal Sd from the initial delay circuit 34 is supplied to the initial reflected sound formation circuit 36 and the reverberation sound formation circuit 38.

The initial reflected sound forming circuit 36 is formed by connecting FIR (Finite Impulse Response) type digital filters 36a and 36b in cascade, so that the sound signal Sd input to the filter 36a is transmitted from the filter 36b as the initial reflected sound signal Si. It has become. Since the level of the initial reflected sound Ti and the length of the generation period vary depending on the hole size, liveness, and the like, the filters 36a and 36b include filters for controlling the level of the initial reflected sound signal Si and the length of the generation period. Control signals CS ₂ and CS ₃ are respectively supplied.

The reverberation generation circuit 38 is a cascade connection of a delay circuit 38a, a reverberation unit 38b, and an attenuator (ATT) 38c. The sound signal Sd input to the delay circuit 38a is transmitted from the attenuator 38c as a reverberation signal Sr. It has become. Delay circuit 38a is for applying a delay corresponding to the delay time t ₂ the sound signal Sd. Delay time t _2, since changes in accordance with the hole size, liveness, etc., the delay circuit 38a, for controlling the delay time, the control signal CS ₄ is supplied. Since the level of the reverberation sound Tr and the length of the reverberation period change according to the hall size, liveness, etc., the control signal CS is supplied to the attenuator 38c in order to control the level of the reverberation sound signal Sr and the length of the reverberation time. ₅ is supplied.

The adder 40 adds the initial reflected sound signal Si and the reverberation sound signal Sr, and the sound signal Sm as an addition output is supplied to the howling prevention circuit 42. Howling prevention circuit 42, the equalizer in the (EQ) 42a and attenuator (ATT) 42b that cascaded, a frequency characteristic in the equalizer 42a so as not to cause howling in connection with a microphone _{M 1} and loudspeaker _{S 11, S 12} The attenuator 42b controls the attenuation characteristics. As the equalizer 42a, any of a graphic equalizer, a parametric equalizer, a minimum phase equalizer, and the like can be used, but a minimum phase equalizer with a small phase change is preferably used. The sound signal from the howling prevention circuit 42 is supplied to a high pass filter (HPF) 44. The high-pass filter 44 is an IIR (Infinite Impulse Response) type digital filter, and is used to remove noise components from the sound signal. The sound signal from the high-pass filter 44 is supplied to a low-pass filter (LPF) 46 for tone color adjustment. The low-pass filter 46 is composed of an IIR type digital filter, and the frequency characteristic and the cut-off frequency Fc are controlled by control signals CS ₆ and CS ₇ , respectively.

FIG. 9 shows frequency characteristics that are selectively set by the low-pass filter 46. As an example, the frequency characteristics F ₁ , F ₂ , F ₃ , and F ₄ correspond to four types of sound fields of small hall, middle hall, large hall, and church, respectively, and the cut-off frequencies fc are f ₁ and f, respectively. ₂ , f ₃ and f ₄ . The attenuation rate (slope) a is −6 dB / oct for the frequency characteristics F _{1 to} F ₃ and −12 dB / oct for the frequency characteristics F ₄ . The contents of the control signals CS _{1 to} CS ₇ are set in advance corresponding to the four types of sound fields. In the controller CNT of FIG. 6, a different sound field is selected every time the controller AS is operated. For example, when a church sound field is selected, control signals CS _{1 to} CS corresponding to the church sound field are selected. ₇ is supplied to the signal processing channel SP ₁ , and as an output signal of the low-pass filter 46, a sound signal including an early reflection sound signal and a reverberation sound signal simulating a church sound field is transmitted. At this time, the frequency characteristic F ₄ is set in the low-pass filter 46. The operation for obtaining a sound signal simulating the sound field related to the selection in accordance with the sound field selection is the same for other sound fields such as small halls. When the sound field is selected, the cut-off frequency fc (any one of f _{1 to} f ₄ ) of the low-pass filter 46 can be arbitrarily changed up and down by operating the operation element FC of the controller CNT.

The sound signal from the low-pass filter 46 is supplied to a user volume (UVR) circuit 48. In the volume circuit 48, the level of the sound signal is adjusted in accordance with the operation of the operation element VR of the controller CNT in FIG. Sound signal Sa is supplied to a D / A (digital / analog) converter 50 via a system ON / OFF switch SW _1. Switch SW ₁ is intended to be turned on or off by operating the operating element SW of the controller CNT of FIG. 6, switch SW ₁ is a sound signal when the ON state is supplied to the D / A converter 50.

The D / A converter 50 converts a digital sound signal into an analog sound signal, and the analog sound signal is supplied to an output amplifier (AMP) 52. As the output amplifier 52, an analog amplifier of about 20 to 40 W can be used. The sound signal amplified by the output amplifier 52 is supplied to the speakers S ₁₁ and S ₁₂ and converted into sound.

In the controller CNT of FIG. 6, the data memory DM stores the initial values of the control signals CS _{1 to} CS ₇ , and when the power switch (not shown) is turned on, the control signals CS _{1 to} CS stored in the memory DM are stored. ₇ , the acoustic characteristic corresponding to the initial sound field is set. Thereafter, an arbitrary sound field can be selected from the plurality of sound fields as described above by operating the operation element AS. The memory DM stores the contents of the control signals CS _{1 to} CS ₇ and the operation states of the operation elements AS, FC, VR..., And recalls the previous acoustic characteristics by operating the operation elements and reproduces them at the next use. It may be.

In the controller CNT, recording means such as a CD (compact disc) recorder can be connected to the recording terminal _JR , and for example, a digital sound signal from the volume circuit 48 can be recorded. In this case, an analog sound signal input to the A / D converter 32 or an analog sound signal output from the D / A converter 50 may be recordable. The reproduction in the terminal J _P, can be connected to the recording means as described above, a sound signal recorded in the recording means can be reproduced in the soundproof chamber 10. In this case, when the sound field effect based on the circuits 34 to 46 is not added to the analog sound signal recorded in the recording means, the sound signal may be input to the A / D converter 32 or the amplifier 30. .

When the controller MD is connected to the interface IF ₁ in the controller CNT, the sound field control as described above with respect to the controller CNT can be performed by the controller MD. In this case, the controller MD may be controlled from a remote place by connecting to the controller CNT by wire or wireless. When the controller PN is connected to the interface IF ₂ , the sound field control as described above with respect to the controller CNT can be performed by the controller PN. In this case, control may be performed from a remote location by connecting the controller PN to the controller CNT by wire or wireless (for example, by connecting to the Internet).

According to the above-described embodiment, the speakers S ₁₁ and S ₂₁ are respectively provided outward at the corner positions that form a diagonal in the upper portion having the greatest effect in the soundproof room 10, and the microphones M ₁ and M ₂ are provided to the speakers S ₁₁ , Other than the corner corresponding to the installation position of S ₂₁ , the speakers S ₁₂ and S ₂₂ are provided at corner positions that make a diagonal with high sound collection efficiency, and the speakers S ₁₂ and S ₂₂ are located below the speakers S ₁₁ and S ₂₁ and about 1-1 A signal processing channel provided at each corner position that forms a diagonal other than the corner corresponding to the installation position of the speakers S ₁₁ and S ₂₁ within a range of 0.5 m, and that receives sound signals from the microphones M ₁ and M ₂ , respectively. SP _1, 2 set of speakers of the antiphase connection to form an indirect sound signal including an initial reflected sound signal and reverberation sound signals by SP _{2 S} 11 -S ₁ , Since then supplied respectively to the S ₂₁ -S _22, tightness and spatial feeling and sound spaciousness rich sounds, such as effective use to play hall narrow space soundproof chamber 10 with a stagnation A field effect can be obtained.

FIG. 10 shows a modified example of speaker connection. The plus terminal and the minus terminal of the output amplifier 52 are connected to the plus terminal and the minus terminal of the speaker S ₁₁ through the attenuator 53, respectively, and the minus terminal and the plus terminal of the speaker S ₁₂ are connected through the attenuator 53, respectively. Connected.

According to the modification of FIG. 10, the speakers S ₁₁ and S ₁₂ are connected in parallel so as to have opposite phases. In addition, since the speaker S ₁₁ receives the sound signal via the attenuator 53, the volume is lower than that of the speaker S ₁₂ . The connection form of FIG. 10 can also be applied to the speakers S ₂₁ and S ₂₂ . Since the speakers S ₁₁ and S ₂₁ are installed at the corner positions in the upper part of the room, the sound volume may become large, and the sound volume can be optimized by connecting as shown in FIG.

  The present invention is not limited to the above-described embodiment, and can be implemented in various modifications. For example, the following changes are possible.

(1) The speakers S ₁₁ and S ₂₁ are not limited to the upper corner position in the room, and may be provided at positions separated from each other such as on the ridge line in the upper portion of the room.

(2) The speakers S ₁₂ and S ₂₂ may be provided not only at the corner positions but also at positions separated from each other such as on the ridgeline or on the wall surface.

(3) The microphones M ₁ and M ₂ are not limited to the upper corner position in the room, but are located at positions separated from each other on one or more of the front, rear, left and right wall surfaces, the ceiling surface and the floor surface, or on the ridgeline. It may be provided.

  (4) The number of signal processing channels may be four, and a total of eight speakers may be provided, two for each channel. In addition, an example in which two speakers are provided for each signal processing channel has been described, but two or more speakers may be provided, and in this case, a series-parallel connection method may be used.

  (5) As an indirect sound signal, an example of forming an initial reflected sound signal and a reverberation sound signal has been shown, but the reverberation sound signal can also be omitted.

It is a perspective view which shows the soundproof room for music practice in which the room acoustic generation apparatus concerning one Embodiment of this invention is used. FIG. 2 is a transverse sectional view taken along line A-A ′ of FIG. 1. It is a cross-sectional view which follows the B-B 'line of FIG. It is a longitudinal cross-sectional view which follows the C-C 'line | wire of FIG. It is a longitudinal cross-sectional view which follows the D-D 'line | wire of FIG. It is a block diagram which shows the indoor sound production | generation apparatus used in the soundproof room of FIG. It is a block diagram which shows the 1st signal processing channel in the room acoustic generator of FIG. It is a timing diagram which shows the various sounds in a performance hall. It is a characteristic view which shows the frequency characteristic selectively set in a low-pass filter. It is a circuit diagram which shows the modification of speaker connection.

Explanation of symbols

10: soundproof room, 34: initial delay circuit, 36: early reflection sound forming circuit, 38: reverberation sound forming circuit, 42: howling prevention circuit, low-pass filter for tone adjustment, M ₁ , M ₂ : microphone, SP ₁ , SP ₂ : Signal processing channel, CNT: Controller, S ₁₁ , S ₁₂ , S ₂₁ , S ₂₂ : Speaker.

Claims (4)

A room sound generation device that generates room sound including indirect sound based on sound generated in a room,
A plurality of first speakers respectively provided outward at positions spaced apart from each other in the upper part of the room;
A plurality of second speakers provided inwardly at positions spaced apart from each other below the plurality of first speakers and above the floor surface in the room, the plurality of first speakers; Each pair is formed, and each pair is connected to the first speaker so that the second speaker is in reverse phase,
A plurality of microphones provided to receive the sound spaced apart from each other on one or a plurality of surfaces or ridge lines of front, rear, left and right wall surfaces, ceiling surfaces and floor surfaces in the room;
A processing unit having a plurality of signal processing channels corresponding to a plurality of sets formed by the plurality of first and second speakers and corresponding to the plurality of microphones, respectively, each microphone corresponding to each signal processing channel An indirect sound signal is formed on the basis of the sound signal from and supplied to the corresponding first and second speakers, and the room is connected via the plurality of first and second speakers. A room sound generation device that generates sound.   The room sound generation device according to claim 1, wherein the plurality of first speakers are provided at corner positions that form a diagonal in the upper part of the room.   The room sound generation device according to claim 2, wherein the plurality of second speakers are provided at corner positions that are diagonal in the room other than the corner corresponding to the installation position of the plurality of first speakers.   4. The room acoustic generation device according to claim 2, wherein the plurality of microphones are provided at corner positions that form a diagonal other than a corner corresponding to an installation position of the plurality of first speakers in the upper part of the room.

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