JPH0562753B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] This invention simulates the reflected sound of an acoustic space such as a hall when playing a record or playing a musical instrument, thereby making the sound as if it were played in the hall. This invention relates to a sound room that can be effectively used as a sound control device that can create an atmosphere as if you are listening to or playing a performance. [Prior Art] When listening to music in a normal listening room or room, the sense of presence can be changed by adding some kind of reverberation to the source. Conventionally, devices that add reverberant sound extract the reverberant components contained in the source itself by, for example, subtracting the left and right channel signals, and then appropriately emphasize, delay, or change the phase. do,
There was a so-called sound processor. However, the reverberation components contained in the source are artificially added through processing such as mixing and adding echoes during recording, and are naturally different from natural reverberations, so it is difficult to enhance, delay, etc. Even with phase changes, it was not possible to obtain the sense of being in the actual hall. Furthermore, since only the reverberation components contained in the source itself can be used, the reverberation is fixed and it is completely impossible for the listener to freely reproduce various hall spaces. Therefore, in order to eliminate the drawbacks of the conventional devices, a device that simulates the reflected sound in an actual hall or the like is being considered. This is done by placing multiple reflective sound speakers around a listening point (listener's position) in a normal room or listening room, etc., and based on reflected sound data in an acoustic space such as a hall. In order to simulate the reflected sound in a model space similar to this, the parameters (reflected sound parameters) for generating the reflected sound to be emitted by each reflected sound speaker are determined, and the reflection of the source signal is calculated based on these reflected sound parameters. (Hereinafter, such a system as a whole will be referred to as a sound room system, and the room or listening room used for this system will be referred to as a sound room.) Note that "reflected sound data" here refers to data that is an element that constitutes reflected sound in an acoustic space, and specifically, the arrival direction and distance (= delay) of reflected sound determined from virtual sound source distribution, etc. time) and amplitude level. In addition, "reflected sound parameters" are used to simulate the reflected sound specified by the reflected sound data using multiple speakers placed around the listening point (listener's listening position) in a sound room. These are parameters for generating reflected sound, specifically the delay time and gain parameters. This reflected sound parameter is determined based on the relationship between the reflected sound data and the position of the speaker relative to the listening point. When realizing such a sound room system, the sound room itself needs to have as little reflection as possible, that is, it needs to be dead. In addition, in the sound room system, each
Since the direction of the reflected sound from the book is also reproduced, even when simulating the same sound field, the reflected sound parameters that should be used will differ depending on the number of speakers and their placement position. It is extremely difficult for the listener to set the reflected sound parameters by himself/herself depending on the situation. Therefore, considering usability, the reproduction conditions of the reproduction sound field, such as the number of speakers and their placement positions, are predetermined.
It would be convenient for anyone to easily enjoy the sound room system if the reflected sound parameters to be used for each speaker were determined in advance to meet these playback conditions. [Problems to be Solved by the Invention] The present invention aims to provide a sound room that has the necessary conditions as a sound room system as described above. [Means for Solving the Problems] The present invention provides at least a side wall portion around the inner surface of a room on which a reflective or sound-absorbing acoustic panel is disposed, and a ceiling panel on which a reflective or sound-absorbing acoustic panel is disposed. an in-room acoustic processing means having a ceiling above the inner surface of the room; a side ceiling above the inner surface of the room filled with a sound absorber; a listener listening position set at a predetermined position in the room; The reproduction conditions of the reproduction sound field are set in advance by four speaker reproduction means, which are housed in the upper part of the four corners of the room where the ceiling parts intersect, and are arranged so as to surround the periphery of the listener's listening position. It is set. Under these playback conditions, an in-room electroacoustic processing means is integrally provided, and the in-room electroacoustic processing means simulates an acoustic space or a model space similar to this under the playback conditions. First, the reflected sound parameters necessary to generate the reflected sound to be supplied to the four speaker reproduction means are stored in advance, and the reflected sound is generated by convolution calculation using the reflected sound parameters.
The signal is supplied to each corresponding speaker. [Operation] According to the solution of the present invention, since the inner surface of the room is treated with a sound absorption treatment means, it has a solid characteristic and the reflection of the room itself is reduced, so that the characteristics of the reflected sound emitted from the speaker are effectively improved. The acoustic space such as a hall, which is specified by its reflected sound characteristics, is well reproduced. In addition, when reproducing reflected sound, the reproduction conditions of the reproduction sound field, such as the acoustic characteristics of the room, the number and arrangement position of speaker reproduction means, and the position of the listening point, are set in advance. The reflected sound parameters used for each speaker reproduction means can be set and stored in advance. Therefore, an optimized reflected sound reproduction state can be easily and uniquely achieved, the difficulty of the listener setting the reflected sound parameters by himself or herself is eliminated, and anyone can easily enjoy the sound room system. [Principle of Sound Room System] Before describing embodiments of the present invention, a sound room system to which the present invention is applied will be described. As mentioned above, a sound room system is
In a normal listening room, etc., multiple speakers for reflected sound are placed around the listening point (listener's position), and based on the reflected sound data in the acoustic space such as a hall, a model of that acoustic space (or similar Parameters (reflected sound parameters) for generating the reflected sound that should be emitted by each reflective sound speaker to simulate the reflected sound in the space (reflected sound parameters)
is determined, and the reflected sound of the source signal is generated based on this reflected sound parameter. The reflected sound data includes an arrival signal of the reflected sound, a delay time, an amplitude level, etc., which can be obtained from a virtual sound source distribution in an acoustic space such as a hall. Here, the virtual sound source refers to an effective sound source of reflected sound viewed from a specific sound receiving point in an acoustic space such as a hall. In other words, the sound emitted from the actual sound source (referring to the actual sound source) not only reaches the sound receiving point as direct sound, but also reflects from all reflective parts in the acoustic space such as walls, ceilings, floors, seats, etc. and reaches the sound receiving point. In this case, at the sound receiving point,
Reflected sound can be regarded as sound emitted from a sound source that is an extension of a line connecting the sound receiving point and a reflection point such as a wall surface, so it can be understood as a virtual sound source at that sound receiving point, that is, a virtual sound source. You can get it. Therefore, the acoustic space at a certain sound receiving point is
It can be understood as the distribution of virtual sound sources at the sound receiving point, and even in a normal listening room or room, by simulating the reflected sound from each virtual sound source, it is possible to reproduce the acoustic space and actually You can experience a sense of realism as if you were inside the acoustic space. The position of a virtual sound source is determined by the direction and distance from the sound receiving point, so to simulate the reflected sound from the virtual sound source, direct sound is moved from the direction of the virtual sound source with a time delay corresponding to the distance. , and at a volume corresponding to the amplitude level of the reflected sound. Then, by performing this for each virtual sound source in the acoustic space, the acoustic space can be reproduced. There are two ways to find a virtual sound source: one is to actually measure the impulse response in an acoustic space such as a hall to be reproduced, and the other is to calculate it from the shape of the acoustic space such as a hall. As the former measurement method, there is a so-called four-point method. This method utilizes the time difference between the impulse responses of four adjacent points in an acoustic space to determine the coordinates of a virtual sound source as seen from those points. An example of measuring the virtual sound source distribution of a certain hall using the four-point method is shown in FIGS. 2 to 4. Figure 2 is a projection view on the X-Y plane (horizontal plane), Figure 3 is a projection view on the
3 is a projection view on the -Z plane. FIG. 3 is a projection view on the XZ plane. The magnitude of o in the figure represents the level of reflected sound, which is typically measured by microphone MIC ₀ , for example. A mirror image method is a method for obtaining a virtual sound source by calculation rather than measurement. As shown in FIG.
Sound source 30 located at a virtual image position using a mirror as the reflected sound at 4
These virtual sound sources 30 are determined according to the wall shape of the acoustic space. An example of finding the virtual sound source distribution of a certain hall using the mirror image method is shown in FIGS. 6 and 7. Figure 6 is X-Y
A projection view onto a plane (horizontal plane), FIG. 7 is a projection view onto a YZ plane. In the case of the mirror image method, the amplitude level is set depending on the distance from the sound receiving point 28 to the virtual sound source. When simulating the reflected sound of the source signal from each virtual sound source in a listening room, etc. based on the virtual sound source distribution data obtained by measurement or calculation as described above, multiple speakers are installed on all sides of the listening room, etc. and send the source signal from an appropriate speaker (corresponding to the direction of the virtual sound source) to an appropriate time delay (corresponding to the distance to the virtual sound source).
By emitting this at an appropriate volume (corresponding to the amplitude level of the reflected sound), it is possible to simulate the reflected sound of the source signal. In this case, the arrival direction, distance, and level of the reflected sound heard at the listening point vary depending on the position of the listening point, that is, the position where the snor listens in the listening room, etc., and the position of each speaker. (and distance if necessary) to calculate the volume and delay time at which the reflected sound should be emitted from the speaker in which direction. Additionally, speakers should ideally be placed in the direction of all virtual sound sources. However, in order to achieve this, speakers would have to be placed all over at least the upper hemisphere of the listening room, centering on the listening point, which is impossible in reality. Economically, the limit is about 4 to 10 speakers, so arrange that many speakers around the listening room, etc., define the area to be assigned to each speaker, and listen to the virtual sound sources included in each area. The reflected sound of each is represented and simulated by the corresponding speaker. According to this method, the reflected sound from a virtual sound source located between adjacent speakers is representatively emitted by one of the speakers, so strictly speaking, it is possible to accurately simulate the direction of the virtual sound source. However, as long as the number of speakers is large enough, there is no problem in practice, and considering that there is a limit to the ability of human hearing to determine direction, this is sufficient. Alternatively, if it is necessary to accurately simulate the direction of a virtual sound source between adjacent speakers, this can be achieved by volume distribution between the speakers. In this way, when simulating the reflected sound from a virtual sound source located between adjacent speakers by representing it with any one speaker, and when simulating it by distributing the volume between the speakers, the volume that should be emitted from each speaker is and delay time will be explained respectively. When simulating using one speaker as a representative, Figure 8 shows eight speakers centered around the listening point 34.
This is an arrangement of SP1 to SP8. Here, the acoustic space is defined as the central position of the adjacent speakers and the listening point 3.
Eight areas on the horizontal plane, separated by a line connecting 4.
Divide into d1-d8. If the reflected sounds in each region d1 to d8 are P _Mo , then at the listening point 34 these reflected sounds P _Mo
The playback sound of each speaker SP1 to SP8 necessary to obtain
P _Ms (M=1 to 8) is expressed by the following formula.

[Table] ⁿ⁼¹ 〓
However, NM (M = 1 to 8): Number of virtual sound sources in each area d1 to d8 (=number of reflected sounds) U: Unit function t: Time τn: Delay time of reflected sound Depending on the volume distribution between adjacent speakers When simulating. As shown in FIG. 9, four speakers SP1 to SP4 are arranged, for example, in the four corners of the sound room 50, and four quadrants n, m, l, k, and each speaker SP1 to SP4 simulates the reflected sound from a virtual sound source in each left and right quadrant. That is, the volume ratio of speakers SP4 and SP1 simulates the reflected sound in quadrant n, the volume ratio of speakers SP1 and SP2 simulates the reflected sound in quadrant m, and the volume ratio of speakers SP2 and SP3 simulates the reflected sound in quadrant l. The reflected sound is simulated, and the reflected sound in quadrant k is simulated by the volume ratio of speakers SP3 and SP4. Each speaker SP1 to SP4 required to simulate each reflected sound
The reproduced sound P _Ms (M=1 to 4) is as follows.

〔Example〕

An embodiment of this invention is shown in FIG. The embodiment shown in FIG. 1 shows an example of a sound room according to the present invention configured as a room of a general size. The sound room 50 in FIG. 1 includes a floor section 260,
The wall portion 262 and the ceiling portion 264 constitute an outer frame. The wall portion 262 and the ceiling portion 264 have an anti-vibration structure. A ceiling panel 266 having a sound absorbing or reflecting effect is attached to the ceiling portion 264. The ceiling 264 has an embedded lighting 268 and a microphone 2.
70 etc. are installed. The side ceiling 272 is filled with glass wool 271. Furthermore, a noise-reducing ventilation fan 274, an opening adjustment material 273, etc. are provided on the side ceiling 272, and speaker built-in units 276 are provided at the four corners of the room, in which speakers (not shown) are built. On the side part 262, an acoustic panel 230, which has a reflective part on one side and a sound absorbing part on the other side, has an upper part supported by the upper mounting sash 210 and a lower part supported by the lower mounting sash 202. These are removably attached, with the reflective part facing up, and the others with the sound absorbing part facing up. Arbitrary acoustic characteristics can be obtained by arranging one with the sound absorbing part facing up and the other with the reflecting part facing up. The wall section 262 includes a soundproof door 278, a control section (electroacoustic control, lighting control, ventilation fan control, air conditioning control for the sound room system) 280, and a built-in amplifier unit 29 for the sound room system.
2, soundproof window unit 294, corner member 296,
An aperture adjustment panel 298 and the like are installed. An example of a mounting structure for the acoustic panel 230 on the wall portion 262 is shown in FIG. This acoustic panel 23
0 has plywood 23 on one side of glass wool 232.
4 are attached, and their peripheries are supported by a frame 236. The glass wool 232 side constitutes a sound absorbing section, and the plywood 34 side constitutes a reflecting section, and depending on the purpose of use, either side is used facing up. The outer peripheral surface of the acoustic panel 230 is covered with a cylindrical decorative cloth 240 in the vertical direction. The upper and lower opening ends of the decorative cloth 240 are connected to the fixing member 24
6,252, respectively. At the upper end of the fixing member 246 and the lower end of the fixing member 252,
Concave portions 250 and 256 are formed, respectively. A height adjustment member 200 is installed at the bottom of the wall portion 262, and a lower mounting sash 202 is mounted on the height adjustment member 200 with screws 20.
It is fixed by 4. Lower mounting sash 202
is provided with an outlet 206. The upper surface of the lower mounting sash 202 is formed with a concave portion 208 to which the lower convex portion 256 of the acoustic panel 230 is removably engaged. Additionally, an upper mounting sash 2 is attached to the upper part of the wall portion 262.
10 is fixed with screws 212. The lower surface of the upper mounting sash 210 is formed with a grooved portion 114 to which the upper protruding portion 250 of the acoustic panel 230 is removably engaged. When attaching the acoustic panel 230 to the wall 262, operate as shown by arrow A in the center of FIG.
First, the upper protruding part 250 of the acoustic panel 230 is fitted into the concave part 250 of the upper mounting sash 210, and in this state, the lower protruding part 2 of the acoustic panel 230 is inserted.
50 is fitted into the groove 208 of the lower mounting sash 202. Although FIG. 14 shows a case where the reflective part side is facing up, the case where the sound absorbing part side is facing up is also mounted on the wall part 262 in the same manner. Note that the sound room 50 shown in FIG. 1 is designed so that its reflection characteristics can be changed in various ways by combining the sound absorbing part and the reflecting part of the acoustic panel 230 so that it can be applied to various uses. Since it is better for the system to have as little reflection as possible from the room 50 itself, it is preferable to use all the sound absorbing parts with the sound absorbing parts facing up. However, the sound absorbing section and the reflecting section may be appropriately arranged to such an extent that no special discomfort occurs even during normal conversation. [Example (1) of use of the room 50 shown in FIG. 1] Next, FIG. 15 shows an example of a sound room system configured for playback of a stereo device or a video device using the sound room 50 shown in FIG. Shown below. In FIG. 15, main speakers 64 and 66 are arranged at the front left and right sides of the sound room 50. As shown in FIG. In addition, in the four corners of sound room 50,
Speakers 56, 58, 60, and 62 for reflected sound are arranged. Speakers 56, 5 for this reflected sound
As described above, the speakers 8, 60, and 62 are previously integrally arranged in the structure of the sound room 50 (inside the speaker built-in unit 276 in FIG. 1). The signal from the source 44 passes through a preamplifier 68 and a power amplifier 70 and is directly generated from the main speaker 66 as sound. In addition, the processor 46 generates a reflected sound signal of the signal of the source 44 for each channel based on the reflected sound parameters of each channel, and sends the reflected sound signal to the speakers 56, 58, 60, 62 for each reflected sound via the 4-channel amplifier 72. , supply to. Arithmetic processing units for generating reflected sound (processor 4
6, etc.) is built into the control section 280 in FIG. Also amplifiers (power amplifier 70, 4
channel amplifier, etc.) is built in the amplifier built-in unit 292 shown in FIG. 1, and these control section 280 and the amplifier built-in unit 292 correspond to the in-room electroacoustic processing means. The reflected sound parameters can be varied by the listener 74 operating the remote controller 76 at the listening position. Note that in an actual hall, there is a time delay in the direct sound depending on the distance between the sound source and the sound receiving point, but the time when the direct sound arrives is set as 0, and the reflected sound parameter of the delay time is determined based on that point. For example, the direct sound is sent directly to the main speaker 6 without any time delay.
Even when emitted from 4.66, the timing of the direct sound and reflected sound is well-coordinated. A specific example of the processor 46 in FIG. 15 is shown in FIG. In FIG. 16, left and right channel audio inputs from the preamplifier 68 are mixed by a mixing circuit 100 and level-adjusted by an input volume 102. The signal is then A/D converted by an A/D converter 106 via a low pass filter (for preventing aliasing during A/D conversion) and a sample/hold circuit 104 . Furthermore, in order to impart frequency characteristics to the reflected sound, a digital filter 10 is applied to each channel.
8, 110, 112, 114. Digital filters 108, 110, 112,
The source signal output from 114 is transmitted to reflected sound generation circuits 116, 118, 120, 1 of each channel.
22. Reflected sound generation circuit 116, 11
8, 120, and 122 calculate the reflected sound of the source signal for each channel based on the reflected sound parameters (delay time data and gain data) of each channel stored in the memory (ROM) 126 according to instructions from the microcomputer 124. Generate signals respectively. These generated reflected sound signals are A/D converted in a time division multiplexed manner by the A/D converter 124. The output signal of the A/D converter 124 is distributed to each channel and sent to a sample/hold circuit and a low-pass filter 12.
6, 128, 130, and 132, respectively, and are smoothed back to analog signals. The signals are then supplied to each channel speaker 56, 58, 60, 62 via the output volume 134, 136, 138, 140 and the power amplifier 48, 50, 52, 54, respectively. As a result, each channel speaker 56, 58, 60, 62 generates reflected sound from the virtual sound source in each corresponding direction, and an acoustic space such as a hall specified by the distribution of the virtual sound source is reproduced. Note that the memory (ROM) 126 stores reflected sound parameters of various acoustic spaces such as halls and frequency characteristics parameters of the digital filters 108, 110, 112, and 114 for each channel. , the parameters of any of the holes are read out via the remote control sensor interface 142 according to a command from the microcomputer 124. These read parameters are stored in RAM12.
7 will be transferred once. And this RAM127
The frequency characteristics of digital filters 108, 110, 112, and 114 are controlled based on the parameters held in . The frequency characteristic parameters held in the RAM 127 are stored in the wireless remote control 7
Adjustment can be made according to preference by operating 6. Also, based on the reflected sound parameters held in the RAM 127, the reflected sound generation circuits 116, 118,
At 120 and 122, reflected sound of the source signal is generated for each channel. The reflected sound parameters held in the RAM 127 are stored in the wireless remote control 76
Adjustments can be made by operating the , which allows you to change the aftertaste according to your preference. By the way, the reflected sound generation circuits 116, 118, 1
20 and 122 can generate a reflected sound signal by superimposing (convolution operation) signals obtained by delaying these input signals (source signals).
The generation of reflected sound by this convolution will be explained below. The reflected sound generation by the convolution operation is performed by the first
Based on the reflected sound parameter sequence of each channel shown in FIG. 3, signals with various time delays and amplitude levels are created from the source signal (direct sound), and these are superimposed. That is, to explain one channel, the reflected sound parameter sequence to be used in that channel is based on the input signal (direct sound) as shown in FIG. 17, and the delay time τ _i
(i = 1, 2, ..., n) and gain (amplitude level)
Assuming that it is configured with a combination of parameters of g _i , as shown in FIG _.
Delayed signals are taken out from each tap corresponding to , respectively, gain g _i is applied by amplitude adjusters 152 - 1 to 152 - n, and the signals are combined by adder 153 . As a result, the adder 153 outputs the reflected sound signal X _put = _o 〓 ⁱ⁼¹ X _i · g _i (3). In addition, although the above description shows only one channel of reflected sound signals having a plurality of channels, reflected sound signals of other channels can also be generated with a similar configuration. By the way, as the adjustment of the reflected sound parameters using the wireless remote controller 76, the following can be done, for example. If you multiply the delay time parameter by a coefficient and relatively expand or reduce the delay time,
The size (SIZE) of the hall to be reproduced will be variable. i.e. large coefficients (>1)
If you multiply the delay time by increasing the delay time, the hole will become wider, and if you multiply by a small coefficient (<1) and shorten the delay time, the hole will become narrower. In this way, the width of the hole can be adjusted by a factor of about 0.0 to 3.0 (depending on the increase in memory capacity, it is possible to increase the size to any multiple). Furthermore, by varying the slope of the gain (corresponding to the amplitude level of the reflected sound) of the reflected sound parameter sequence, the live feeling (LIVENESS) can be varied. That is, making the gain slope steeper gives a dead characteristic, while making it gentler gives a live characteristic. This is achieved by increasing or decreasing the level of the parameter of the reflected sound with a longer transmission time. In addition, the delay time, gain, or both of the reflected sound parameter sequence can be periodically varied, for example,
By varying the values of each parameter with a sinusoidal low-frequency signal, the spatial clarity of the reproduced acoustic space can be blurred (DIFFUSION), producing special acoustic effects. Incidentally, there are various possible arrangements of the reflected sound speakers in the sound room 50 in addition to those described above. Below, various arrangement columns will be explained. FIG. 19 shows four speakers 56, 58, 6
0 and 62 are placed at the four corners of the ceiling toward the center of the sound room 50. In this case, since the speakers 56, 58, 60, and 62 are on the ceiling,
The upper hemisphere including the ceiling and horizontal directions can be simulated. As the data of the virtual sound source, the second
The reflected sound parameters for creating the reflected sound to be emitted from each speaker 56, 58, 60, 62 using the data projected on the X-Y plane shown in the figure and FIG. Find it by FIG. 20 shows four speakers 56, 58, 6.
0 and 62 are placed at the four corners of the wall of the sound room 50, facing toward the center of the room 180, and a speaker 55 is placed at the center of the ceiling facing downward, forming a pyramid shape. Speakers 56 at the four corners,
Regarding the speakers 58, 60, and 62, use the data projected onto the X-Y plane as in the case of FIG.
Find the reflected sound parameters to be used at 0.62. Further, regarding the speaker 55, the reflected sound from the upper hemisphere of the data projected on the X-Y plane and the X-Z plane is simulated. in this case,
Since the vertical position of the reflected sound played by the four surrounding speakers 56, 58, 60, 62 is simulated by the ceiling speaker 55, the reflected sound played by the four surrounding speakers 56, 58, 60, 62 is simulated. The delay time and level of the reflected sound emitted from the ceiling speaker 55 are calculated in relation to the above. As a calculation method, if the reflected sound P _o is tilted by θ _o degrees in the Z-axis (vertical axis) direction with respect to the Y-axis (horizontal axis), the reproduced sound to be emitted by the ceiling speaker 55 is P _s (t) = _Nu 〓 ⁿ⁼¹ P _o COS (θ _o ) × U (τ _o ) However, Nu: the number of reflected sounds on the upper hemisphere. The speaker 57 is placed facing upward.This floor speaker 57 simulates the sound reflected from the lower hemisphere of the data projected on the Y-Z plane and the X-Z plane.In this case , the reproduced sound P _r to be emitted by the floor speaker 57 is _calculated as follows: P _r (t ₎ = _Nv 〓 ^m=1 P _n COS ( θ _n )×U(τ _n ) However, Nv: Number of reflected sounds on the lower hemisphere. Figure 22 shows speakers 56, 58, 60, and 62 placed at the four corners of the ceiling of a sound room 50 and directed toward the center of the room. and a speaker 5 between them.
9, 61, 63, and 65 are respectively arranged toward the center of the sound room 50. In this case, data of a virtual sound source projected onto the XY plane is used. Also, in this case, since there are a large number of speakers, the reflected sound from the virtual sound source in the center of the adjacent speakers only needs to be emitted as a representative sound from one of the speakers, so it is similar to that shown in Fig. 8 above. Based on equation (1) above, each speaker 56, 58, 6
Find the reproduced sounds of 0, 62, 59, 61, 63, and 65. [Example (2) of use of the sound room 50 shown in FIG. 1] FIG. 23 shows an example of a sound room system configured for musical instrument performance (including singing) using the sound room 50 shown in FIG. 1. In FIG. 23, the sound room 50 is located in the first
As in the case of Fig. 5, the characteristic is assumed to be dead. At the four corners of the room 50, there are reflective sound speakers 56, 58,
60 and 62 are arranged. Further, microphones 270, 270 are arranged on the ceiling. A mobile microphone 84 is also placed near the musical instrument 90. Incidentally, the microphone 84 picks up the sound of the musical instrument itself, and the microphones 270 and 270 pick up the sound taking into consideration the directionality of the musical instrument (which direction the musical instrument is facing). When the performer 88 plays the musical instrument 90, the sounds are picked up by the microphones 270, 270, and the signals are mixed by the microphone mixing circuit 92. Then, a reflected sound is created by the processor 46 based on the parameters of the reflected sound. This is transmitted to each speaker 5 via a 4-channel amplifier 72.
By emitting sounds from the instruments 6, 58, 60, and 62, the player 88 can enjoy playing the instrument in an atmosphere as if he were playing in a hall. Note that in the case of playing a musical instrument or singing, the source signal does not originally contain reverberation components, and the reflected sound generation circuits 116, 118, 120, 122 (16th
Since it is difficult to obtain a sufficiently long reflected sound using only the reverberation sound generation circuit 123 as shown in the box in FIG. As the reverberation sound generation circuit 123, a simple configuration using a field back loop such as a comb filter or an all-pass filter can be used. The reverberation sound generation circuit 123 can be turned off in the case of record reproduction (FIG. 15) in which the source originally contains reverberation sound. The processor 46 and 4-channel amplifier 72 shown in FIG. 23 are also housed in the control section 280 and the amplifier built-in unit 292 shown in FIG. 1, respectively, as in the case of the usage example shown in FIG. 15 described above. Further, the microphone mixing circuit 92 is built into the control section 280 shown in FIG. In addition, an example of the use of Fig. 15 (stereo etc. playback)
In the example of use (playing a musical instrument, etc.) shown in FIG.
Turns on/off the amplifiers connected to the microphone 84, etc. In addition, when performing in an actual hall, the performer will listen to the reflected sound while performing at the performance position, so the sound source and sound receiving point are both set at the performance position, that is, on the stage. If the reflected sound is generated using the reflected sound parameters of each speaker based on the virtual sound source distribution, the performer can perform in the room 50 with the atmosphere of being on the stage of the hall or the like. Furthermore, the present invention is not limited to this, and by obtaining reflected sound parameters based on virtual sound source distributions obtained by varying the sound source and sound receiving point, it is possible to enjoy a variety of performances. Here, another example of the arrangement of microphones in the sound room 50 will be explained. Arrangement in Fig. 24 Fig. 24 shows an example of arrangement of four microphones. That is, the microphones 82, 83, 84,
85 is each speaker 5 on the ceiling of the sound room 50
6, 58, 60, and 62, respectively. Each microphone 82, 83, 84,
85 is the adjacent speaker 56, 58, 60, 62
Howling is less likely to occur because the location is equidistant from the Also, microphone 8
2, 83, 84, and 85 are attached to the ceiling wall and arranged so that the frequency characteristics of the microphone input are flat. Arrangement in Figure 25 Figure 25 shows microphones 82, 83, 84,
85 are arranged at the four corners of the floor of the sound room 50. With this arrangement, the sound pressure at the microphone pickup point is the highest over the entire frequency band, and the frequency characteristics are flat. In addition, speakers 56, 58, 6
The influence of direct sound radiation from 0.62 is small,
The howling margin is also large. Arrangement in FIG. 26 FIG. 26 shows four directional microphones 82,
83, 84, and 85 are arranged near the four corners of the ceiling of the sound room 50, facing toward the musical instrument sound source (toward the center of the room 50). Microphones 82, 83, 84, 85 are connected to speakers 56, 5
Although the speakers 8, 60, and 62 are arranged close to the radiation axes, they have strong directivity, and the speakers 56, 5
8, 60, and 62, so speaker 5
The sounds from 6, 58, 60, and 62 are not picked up, and the howling margin increases significantly. [Embodiment 2] In the embodiment shown in Fig. 27, the present invention is configured for use in a small space, and each component is constructed into a unit shape and assembled into a capsule shape, so that it can be easily installed in an existing room. This allows you to configure a sound room. By using this, it is possible to realize a sound room system in a general home or the like without remodeling the room itself. Also,
It can also be used as a soundproof room for practicing piano, etc. This sound room 300 has four corner materials 301, 302, 304, and 306 as supports.
Between these, wall panels 310, 312, 314,
316 to form the wall surface. Further, a ceiling unit 318 is fitted into the ceiling, and a floor panel 320 is fitted into the floor. These wall panels 3
10,312,314,316, ceiling unit 3
18. The floor panel 320 has a sound-absorbing surface (the floor panel 320 can be easily made sound-absorbing by laying a carpet, etc.) Wall panel 3
10, 312, 314, 316 are of a certain width as one unit, and by connecting them horizontally,
A sound room of any size can be constructed (the ceiling unit 318 and floor panel 320 are also prepared with corresponding sizes).The wall panel 310 has electrical acoustics, lighting, A control unit 322 having built-in control devices for a ventilation fan, an outlet, etc. is provided. In addition, the wall panel 316
is provided with a door 324 for entry and exit. Furthermore, although not shown, a microphone and speakers are embedded in the ceiling unit 318 at each corner. 28 and 29 show a capsule-shaped sound room 300 made by assembling the one shown in FIG. 27. The one shown in Fig. 28 is for stereo reproduction, and the one shown in Fig. 29 is used for musical instrument performance. Speakers 326 are embedded in the four corners of the ceiling unit 318. Further, a lighting 330 is installed in the center of the ceiling unit 318. [Effects of the Invention] As explained above, according to the present invention, since the inner surface of the room is treated with sound absorption treatment, it has a solid characteristic, and as a result, the reflection of the room itself is reduced, so that the sound emitted from the speaker is The characteristics of the reflected sound are effectively utilized, and an acoustic space such as a hall specified by the characteristics of the reflected sound is well reproduced. In addition, when reproducing reflected sound, the reproduction conditions of the reproduction sound field, such as the acoustic characteristics of the room, the number and arrangement position of speaker reproduction means, and the position of the listening point, are set in advance. The reflected sound parameters used for each speaker reproduction means can be set and stored in advance. Therefore, an optimized reflected sound reproduction state can be easily and uniquely achieved, the difficulty of the listener setting the reflected sound parameters by himself or herself is eliminated, and anyone can easily enjoy the sound room system. In addition, since multiple speakers for reproducing reflected sound and arithmetic processing means for creating reflected sound are integrated in advance in a sound-absorbing room, there is no need to worry about the hassle of arranging speakers, installing them, wiring, etc., and reducing the appearance. Inconveniences such as poor performance are eliminated, and the desired sound room can be easily realized.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention. Figures 2, 3, and 4 are diagrams showing virtual sound source distributions obtained by the four-point method;
Y plane projection view, Figure 3 is Y-Z plane projection view, Figure 4
The figure is an XZ plane projection view. FIG. 5 is a diagram showing the principle of the virtual sound source measurement method using the mirror image method. 6 and 7 are diagrams showing virtual sound source distributions determined by the mirror image method, where FIG. 6 is an X-Y plane projection view and FIG. 7 is a Y-Z plane projection view. FIG. 8 is a plan view showing how reflected sound is reproduced by eight surrounding speakers. FIG. 9 is a plan view showing a reflected sound reproduction state by four surrounding speakers. Figure 10,
Figures 11 and 12 show the volume distribution between each speaker to simulate reflected sound between adjacent speakers, and Figure 10 shows the volume distribution between each speaker.
Figure 11 is based on the COS function, Figure 11 is based on the linear function, and Figure 12 is based on the log function.
Figure 13 shows a reflected sound parameter string used to create the reflected sound to be supplied to each speaker when simulating the reflected sound with the speaker arrangement shown in Figure 9 based on reflected sound measurement data using the 4-point method. FIG. FIG. 14 is a sectional view showing the mounting structure of the acoustic panel 30 in the sound room 50 of FIG. FIG. 15 is a block diagram showing an example of a sound room system configured for playback of a stereo device or a video device using the sound room 50 of FIG. 1. Figure 16 shows
16 is a block diagram showing an example of the configuration of the processor 46 in FIG. 15. FIG. FIG. 17 is a diagram showing a reflected sound parameter sequence used for reflected sound generation in the reflected sound generation circuits 116, 118, 120, and 122 of FIG. 16. FIG. 18 shows a first circuit configured to generate a reflected sound signal of an input signal by a convolution operation using the reflected sound parameters shown in FIG. 17.
Reflected sound generation circuits 116, 118, 120 in Fig. 6,
122. FIG. Figures 19 to 22
The figures are perspective views showing other examples of speaker arrangement in the sound room 50. 23rd
FIG. 1 is a block diagram showing an example of a sound room system configured for playing musical instruments using the room 50 shown in FIG. FIGS. 24 to 26 are perspective views showing other examples of arrangement of microphones in the sound room 50, respectively. 27th
The figure is an exploded perspective view showing another embodiment of the invention. 28 and 29 are diagrams showing how the sound room 300 of FIG. 27 is used, in which FIG. 28 is configured for stereo reproduction, and FIG. 29 is configured for musical instrument performance. 50,300...sound room, 280,3
22...Control unit, 326...Ceiling-mounted speaker, 270...Ceiling-mounted microphone.

Claims (1)

[Claims] 1. At least a side wall portion around the inner surface of the room where a reflective or sound-absorbing acoustic panel is disposed, and a ceiling portion above the inner surface of the room where a reflective or sound-absorbing ceiling panel is disposed. , an in-room acoustic processing means having a side ceiling above the inner surface of the room filled with a sound absorbing material, a listener listening position set at a predetermined position in the room, and a room where the side ceiling intersects. four speaker reproduction means arranged to surround the listener's listening position while being absorbed in the side ceiling at the upper part of the four corners; Based on the reflected sound data consisting of the direction of arrival, delay time, and amplitude level of each reflected sound, each of the four speaker reproduction means is used to reproduce sounds in the acoustic space or a similar model space around the listener's listening position. In order to reproduce a large number of reflected sounds, each of the speakers is determined from the relationship between the in-room placement position of the speaker reproduction means, the in-room set position of the listener listening position, and each reflected sound arrival direction of the reflected sound data. Impulse response characteristics consisting of delay time and gain of a group of reflected sounds to be emitted by the reproduction means are stored as reflected sound parameters for each of the speaker reproduction means, respectively,
Based on each of these memorized reflected sound parameters,
By performing a convolution operation on the source signal to be reproduced in the room, signals of reflected sound groups to be emitted by the four speaker reproduction means are respectively generated, and the corresponding positions of the four speaker reproduction means are generated. What is claimed is: 1. A sound room, characterized in that it is integrally equipped with in-room electroacoustic processing means configured to supply electricity to each of the sounds.