JP2904970B2 - Sound field simulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is a sound field simulator BACKGROUND OF THE, particularly the sound field of the sound environment in the design stage, and simulated on the basis of the design data, on Ruotojo simulator can of be simulated experience to listen person .

[0002]

2. Description of the Related Art Conventionally, in an initial stage of designing sound fields such as a concert hall, a studio, and a listening room, a sound ray method or a sound ray method has been used in order to grasp the basic properties of the room shape constituting the sound field. Geometric acoustic analysis such as the virtual image method is often performed.

[0003] However, it is not easy to accurately grasp an acoustic image such as a feeling of spatial expanse, a direction of sound, and a feeling of reverberation from numerical data obtained by geometric acoustic analysis.

[0004] For this reason, a sound field simulator has been proposed in the design stage, which allows the auditory experience of the acoustic effect of a completed concert hall. Such proposals include, for example, JP-A-3-38695 and JP-A-1-38695.
239,674, JP-A-3-15896, JP-A-61-262000, JP-A-60-1403
No. 95 publication.

All of these sound field simulators simulate how a sound from a sound source is heard at a sound receiving point in a sound field such as a concert hall based on design data, and simulate the sound in an audible room. It creates a sound field.

Therefore, the listener actually experiences the sound environment in the designed sound field in the audible room,
It is possible to evaluate whether or not the designed sound field matches the sound image of the listener.

[0007]

There are many halls constructed today that are not only dedicated to concerts, but also multipurpose halls that can be widely used for concerts and lectures. When designing the sound field of such a multipurpose hall, for example, for a mono sound source that does not use speakers such as a music concert, or for a multi sound source that uses multiple speakers such as a lecture, for example. It is necessary to form a sound field having a good sound environment. Because
For example, in a hall or the like in which reverberation sound is sufficiently obtained for a mono sound source, if a lecture or the like using a speaker is performed, the reverberation sound is too strong and the voice is difficult to hear.

[0008] In addition, even when performing a music concert or the like, it is necessary to evaluate what kind of sound environment will be obtained in the case of a multi-sound source that uses many speakers such as rock music.

However, the conventional sound field simulator can simulate the sound field only for a mono sound source, and there is no sound field simulator capable of simultaneously evaluating both the sound field of the mono sound source and the sound source of the multi sound source. Was.

[0010] The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide:
An object of the present invention is to provide a sound field simulator that allows a user to compare and experience a sound field when a mono sound source and a multi sound source exist.

[0011]

In order to achieve the above-mentioned object, the present invention provides a method for determining how a sound from a predetermined sound source in a sound field is heard at a predetermined sound receiving point based on sound field design data. In a sound field simulator that simulates and forms a simulated sound field in an audible room, the sound source does not use a speaker
And simulation data for omnidirectional mono sound signal, a memory source stores the simulation data in the case of directional multi-sound source using a speaker, before
The mono sound source and the multi sound source can be selected in an audible room.
The selecting means formed as described above, the simulation data of the sound source selected by the selecting means is read out from the memory , and the actually input audio signal and the read out
And sound field forming means for forming a simulated sound field in the audible room based on the simulation data. In the audible room, a sound field in the case where the sound source is a mono sound source and a multi sound source can be compared and experienced.

[0012]

As described above, in the sound field simulator of the present invention,
In the memory, simulation data for a mono sound source that does not use a speaker in a sound field and simulation data for a multi sound source that uses a speaker are stored in advance in a memory. Then, by operating the selection means, simulation data of a mono sound source or a multi sound source can be arbitrarily called from the memory, and the sound field of the mono sound source and the multi sound source can be compared and experienced in the audible room.

Therefore, by using the sound field simulator of the present invention, it is possible to compare and experience sound fields used for a mono sound source and for a multi sound source, and to accurately evaluate the sound field.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a preferred example of a sound field simulator according to the present invention. The sound field simulator of the embodiment includes a sound design CAD system 10 for designing a predetermined sound field such as a concert hall, and an arithmetic processing system 40 for creating a simulated sound field in the audible room 100 from data of the designed sound field. And

FIG. 2 shows an example of a sound field such as a concert hall designed by the CAD system 10 for acoustic design.

The acoustic design CAD system 10 of the embodiment designs such a sound field, and determines how the sound from the sound source 12 is heard at a predetermined sound receiving point 14 in the sound field. Computation is performed based on the design data of the field, and the computed simulation data is
Is written and stored in the memory 42.

At this time, the simulation data written in the memory 42 can be calculated as an impulse response received at the sound receiving point 14 when an impulse sound wave is output from the sound source 12 in the sound field. The impulse response includes a direct sound that directly reaches the sound receiving point 14 from the sound source 12, an initial reflected sound group that is subsequently reflected from a reflective surface such as a ceiling or a wall surface, and a reverberant sound group (the above-described reflected sound group). The sound density increases with the passage of time, and eventually becomes a group of reflected sounds that cannot be separated individually, so-called reverberation sounds). Each impulse response seen at this time comprehensively represents various effects such as sound absorption and reflection in the sound field.

A CAD system 10 for acoustic design of an embodiment
Is obtained by dividing such an impulse response at the sound receiving point 14 into 12 parts by dividing a hemispherical surface centered on the sound receiving point into directions, calculating each direction, and writing and storing it in the memory 42.

The audible room 100 for simulating this sound field has a listening room 1 where a listening person sits in the center of the floor.
10 are installed. Direct sound speakers 120R and 120L are arranged in front of the listening room 110, and 12 loudspeakers are arranged on the hemisphere centered on the listening room 110 so as to correspond to the 12 divided areas of the sound field. ... 122-12
Is arranged. In the embodiment, each speaker 122- is divided so that the horizontal direction is divided into eight and the ceiling direction is divided into four.
1, 122-2... 122-12 are arranged.

The CAD system 10 for acoustic design is placed on a monitor 112 installed in front of the listening room 110.
The design image of the sound field shown in FIG.
The image is displayed by the V system 30.

The arithmetic processing system 40 performs signal processing on the sound from the dry source 20 based on the simulation data of the sound field 12 stored in the memory 42,
A pair of direct sound speakers 120R, 1R via the amplifier 44
The direct sound is output from 20L, and the reflected sound corresponding to the impulse response in each direction is output from the twelve reflected sound speakers 122-1, 122-2 ... 122-12.
As a result, a simulated sound field similar to that when the sound from the sound source 12 in the sound field shown in FIG. You can actually experience the sound environment at the design stage.

It is preferable to use a dry source 20 recorded in an anechoic chamber as a sound source used for creating such a simulated sound field. A simulated sound field is created in the same manner from the sound (real voice, live performance, etc.) collected by the installed sound collecting microphone 124 as a dry source.

FIG. 3 shows a detailed circuit diagram of the sound field simulator of the embodiment.

In this embodiment, the memory 42 includes a mono sound source memory area 42a and a multi sound source memory area 42a.
b.

In the mono sound source memory area 42a, FIG.
The simulation data in the case of a mono sound source that does not use a speaker in the sound field shown in (1) is stored, and the simulation data in the case of a multi sound source using a speaker is stored in the multi sound source memory area 42b.

The simulation data in the case of the mono sound source is generated by using the sound design CAD system 10 and the sound source 1.
2 is simulation data obtained by calculation when the sound source 12 is located at the center of the stage and the sound source 12 is assumed to be a non-directional sound source.

The simulation data in the case of a multi-sound source is data when a sound source is set at a speaker setting position used in the sound field shown in FIG. In the case of using left and right two-channel speakers, simulation data created using each speaker setting position as a sound source is used. In this case, it is necessary to create simulation data in consideration of the directivity and frequency characteristics of the speaker.

FIG. 4 shows an example of simulation data when a mono sound source is installed in a sound field. FIG. 7A shows the waveform of all impulse responses, and FIG.
Is an impulse waveform 200 of a direct sound, and FIG.
Are the impulse waveform 210 of the initial reflected sound from each of the 12 divided directions and the impulse waveform 220 of the reverberant sound.
The impulse waveform 210 of each of these initial reflected sounds is stored as an impulse response for 500 ms from the time of output of the sound wave pulse from the sound source 12 in order to reduce the computational load on the arithmetic processing system 40. And 500m
The reverberation after s is obtained as an impulse response 220 having the same pattern as shown by a dotted line in the figure, and is set for each channel. Note that the impulse response of the reverberant sound may be formed so as to overlap the impulse response of the initial reflected sound for a certain period of time, if necessary.

The dry source 20 of the embodiment is a CD
Each output includes a player 20a, a DAT player 20b, a cassette player 20c, a disk player 20d, and a video deck 20e. The output of the microphone 124 installed in the audible room 100 is supplied to the switch 22 by the amplifier 1.
26 is input. The switch 22 arbitrarily selects each of these inputs under the control of a central control device (not shown), inputs an audio signal included in the selected input signal to the arithmetic processing system 40, and outputs the video signal to the AV system. It is configured to input to the system 30.

The arithmetic processing system 40 of the embodiment comprises a digital signal processor 60 and a DS for this digital signal processor.
And a P controller 50. Then, the DSP controller 50 operates the operation panel 1 installed in the audible room 100.
Arbitrary simulation data is read from the memory 42 in response to an input signal from the memory 30, and the digital signal processor 60 is controlled based on the read simulation data.

That is, the operation panel 130 is provided for
The sound source is configured so as to be easily operated by a listener sitting at 10, and specifically, a mono sound source selection unit 132 for selecting a sound field of a mono sound source, and a multi sound source selection unit 134 for selecting a sound field of a multi sound source. And Therefore, for example, when a mono sound source is selected by the mono sound source selection unit 132, the DSP controller 50
From 2a, the sound field of the concert hall currently being designed
The simulation data corresponding to the mono sound source is read. Then, the DSP controller 50 arithmetically controls the digital signal processor 60 based on the simulation data thus read.

The digital signal processor 60 is connected to the audio signal input via the switch 22 and the DSP controller 5
Based on the control signal input from 0, a direct sound and 12
The initial reflected sound group and the reverberant sound group for the channels are synthesized and reproduced, and these are transmitted via the digital amplifier 44 to the corresponding direct sound speakers 120R and 120L and the indirect sound 12-channel speaker groups 122-1 and 122-. 2 ... 122
Output to -12.

Thus, a simulated sound field simulating the sound field shown in FIG. 2 is created in the audible room 100 shown in FIG. 1, and the listener sitting in the listening room 110 receives the sound shown in FIG. In the hall, the sound environment of how the sound of the mono sound source 12 can be heard at the sound receiving point 14 can be actually experienced.

At this time, the image data of the sound field selected by the operation panel 132 is stored in the hall room type data memory 32.
And the image is displayed on the monitor 112 via the switch 34.

It should be noted that a video signal is output together with the audio signal from the disc player 20d or the video deck 20e used as the dry source 20, but when such a video signal is desired to be displayed on the display 112, it is not shown. Switching unit 3 according to a command from the central control unit
4 may be controlled so that the input from the switch 22 is selected.

FIG. 5 shows a detailed configuration of the digital signal processor 60 and the digital amplifier 44 used in the embodiment.

The digital signal processor 60 includes a switch 2
2 is input to the first and second initial delay generators 64 and 68 via the AD converter 62. The AD converter 62 outputs the audio signal input via the switch 22 when the audio signal is a digital signal, and outputs the digital signal when the input audio signal is an analog signal. After that, it is formed to output.

The first initial delay generating section 64 performs a delay process on the audio signal by the arrival time of the direct sound based on the impulse response of FIG. Control units 66R, 66L and reflected sound generation units 66-1, 66-2,.
Output to

The direct sound generators 66R and 66L convolve the input voice signal with the impulse response shown in FIG. 4B to generate a direct sound. Then, the direct sound obtained as described above is output to the speakers 120R and 120L via the DA amplifiers 44R and 44L, and the direct sound is generated in the audible room 100.

The reflected sound generator 6 for 12 channels
6-1, 66-2,..., 66-12 represent the initial reflection of each channel shown in FIG. 4C read from the memory 42 in the dry source sound signal input from the first initial delay generation unit 64. The sound impulse response is convoluted to generate an initial reflected sound for 12 channels that can be heard from each direction.
Then, the thus generated initial reflected sounds for 12 channels are output from the DA amplifiers 44-1, 44-2,.
12, and is output toward the audible room 100 via the corresponding 12-channel reflected sound speakers 122-1, 122-2, 122-12.

Further, the second initial delay generation unit 68
The input dry source sound signal is subjected to a predetermined delay process, and the reverberation sound generation units 70-1 and 70- for 12 channels are processed.
2. Output to 70-12.

The reverberation generator 70-170 for each channel
.., 70-12 convolve the impulse response for reverberation shown in FIG. 4C read from the memory 42 with the dry source sound signal input from the first initial delay generation unit 64. , And 12 channels of reverberation sound, which are reflected sound generation units 66-1, 66-2,.
66-12, digital amplifiers 44-1, 44-2 ... 44
-12, the corresponding indirect sound speaker 122-
, 122-12 to the audible room 100.

The present embodiment has the above configuration, and its operation will be described below.

First, it is assumed that the orderer of the concert hall shown in FIG. 2 experiences the sound field of the concert hall using the sound field simulator of this embodiment.

In this case, the orderer becomes a previewer,
The user sits on the audition seat 110 of the audible room 100 and operates the mono sound source selection unit 132 of the operation panel 130 so that the mono sound source memory area 42
Select the mono sound source stored in a.

Thus, the DSP controller 50
Reads simulation data from the mono sound source memory area 42a of the memory 42 when the mono sound source 12 that does not use a speaker is used in the sound field in the design stage,
The digital signal processor 60 is controlled.

As a result, the digital signal processor 60
A direct sound is calculated from the sound signal input from the dry source 20 and output from the direct sound speakers 120R and 120L, and an initial reflection sound and a reverberation sound for 12 channels are calculated from the input sound signal, , 122-12,..., 122-12.

In this way, a simulated sound field of a concert hall at the design stage is formed in the audible room 100, so that the listener sitting at the listening seat 110 can hear the mono sound source 12 in the sound field shown in FIG. The user can experience how to hear the sound from at the sound receiving point 14.

In the sound field at the design stage shown in FIG. 2, a listener listens to a mono sound source without using a speaker and a multi sound source using speakers or the like. By operating the selection unit 134, a multi sound source may be selected.

Thus, the DSP controller 50
Reads the simulation data for the multi-sound source of the sound field at the design stage stored in the multi-sound source memory area 42b in the memory 42, and similarly controls the digital signal processor 60.

Thus, when a plurality of speakers having predetermined directivity and frequency characteristics are installed in the audible room 100 at the speaker installation positions in the sound field shown in FIG. A simulated sound field of how the sound is heard is created, and the listener can experience the sound field when there is a mono sound source and a multi sound source.

In particular, according to the sound field simulator of the present embodiment, the listener who is in the audible room 100 has the operation panel 130 at hand.
By simply operating, the sound field of a mono sound source can be instantaneously switched to the sound field of a multi sound source, and both can be compared and experienced in a short period of time. Objectively evaluates the sound field of a multipurpose hall used for lectures etc. at the design stage,
This is extremely effective when fed back to the design.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention.

[0055]

As described above, according to the present invention,
The omnidirectionality without using a speaker as the sound source determines how the sound from the predetermined sound source in the sound field is heard at the sound receiving point .
In the case of the mono sound signal, the switch Misao in audible chamber as simulated sound field in the case of directional multi <br/> switch sound source using a speaker
There is an effect that it is possible to obtain a sound field simulator that can be compared easily by time without changing the time . This allows us to evaluate both the case where the sound field at the design stage is used as a sound field for a mono sound source such as a concert, and the case where the sound field is used as a sound field for a multi sound source using speakers such as a lecture. This can be performed while opening and comparing the two, which is extremely effective for designing various sound fields, particularly for designing a multipurpose hall.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of a sound field simulator of the present invention.

2 is an overall perspective view of a sound field in a design stage designed by the CAD system for design shown in FIG. 1;

FIG. 3 is a detailed circuit diagram of the sound field simulator shown in FIG.

FIG. 4 is a waveform diagram of an impulse response of a direct sound, a reflected sound, and a reverberant sound stored in the memory of FIG. 3;

FIG. 5 is a block circuit diagram showing a detailed configuration of a digital signal processor and a digital amplifier shown in FIG. 3;

[Explanation of symbols]

Reference Signs List 20 dry source 40 arithmetic processing system 42 memory 60 digital signal processor 64 first initial delay generator 68 second initial delay generator 66R, 66L direct sound controller 66-1, 66-2 ... 66-12 reflected sound Control unit 70 Reverberation sound control unit 100 Audible room 120R, 120L Direct sound speakers 122-1, 122-2, ... 122-12 Reflected sound speakers 130 Operation panel
TD005001

Claims (1)

(57) [Claims] 1. A sound field simulator which simulates how a sound from a predetermined sound source in a sound field is heard at a predetermined sound receiving point based on sound field design data to form a simulated sound field in an audible room. in the above, the simulation data for omnidirectional mono sound signal in which the sound source is not used speaker, a memory source stores the simulation data in the case of directional multi-sound source using a speaker, and the mono sound signal Multiple sound sources can be selected in the audible room
Selecting means formed so as to read simulation data of the sound source selected by the selecting means from the memory ,
Between the voice signal and the read simulation data
A sound field forming means for forming a simulated sound field in an audible room based on the sound field simulator, wherein a sound field in the case of a mono sound source and a multi sound source can be compared and experienced in the audible room.