JPH0573081A - Sound field simulator - Google Patents

Abstract

PURPOSE:To provide the sound field simulator which enables a listener to experience plural sound sources in an audio room by comparison. CONSTITUTION:This sound field simulator simulates how the sound from a specific sound source in a sound field is listened to at a specific sound reception point according to design data on the sound field and generates a dummy sound field in the audio room. The sound field simulator includes a sound field memory 42 stored with simulation data on the plural sound fields, a console panel 132 which is so constituted as to select an optional sound field by the listener in the audio room, and a sound field generating means which reads the simulation data on the sound field, selected on the console panel 132, out of the sound field memory 42 and generates the dummy sound field in the audio room. The listener can experience the sound fields by comparison in the audio room by operating the console panel 132.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound field simulator, and more particularly to a sound field simulator which can simulate a sound environment of a sound field in a design stage based on design data and allow a listener to experience it.

[0002]

2. Description of the Related Art Conventionally, at the initial stage of designing each sound field in a concert hall, studio, listening room, etc., in order to grasp the basic properties of the room shape that constitutes the sound field, the sound ray method and Geometrical acoustic analysis such as virtual image method is often performed.

However, it is not easy to accurately grasp the acoustic image such as the feeling of space expanse, sound directionality, and reverberation from the numerical data obtained by the geometrical acoustic analysis.

For this reason, conventionally, at the design stage, a sound field simulator has been proposed in which the acoustic effect of a completed concert hall can be auditorily experienced. As such a proposal, for example, JP-A-3-38695, JP-A-1-
239674, JP-A-3-15896, JP-A-61-262000, JP-A-60-1403.
No. 95 publication is available.

In such a sound field simulator, in a sound field such as a concert hall, how sound from a sound source is heard at a sound receiving point is simulated based on design data and simulated in an audible room. It is designed to create 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 acoustic image of the listener.

[0007]

However, the conventional acoustic simulator has the following problems.

That is, the orderer of the concert hall or the like objectively evaluates the sound field in the design stage by comparing the sound environment of the designed sound field with that of another concert hall or the like. can do.

In particular, if the sound environment of the ordered concert hall can be compared with the sound environment of a concert hall close to the image of the orderer, such as the suntory hall or NHK hall, the sound field of the concert hall at the design stage is qualified. It can be evaluated as an effective material for design changes.

Particularly, in such an auditory evaluation, it is difficult to perform an objective and accurate evaluation unless the sound environments of a plurality of sound fields are continuously listened to without comparing with each other. The field simulator has a problem that such continuous comparison and evaluation cannot be performed at all.

The present invention has been made in view of such conventional problems, and an object thereof is to provide a sound field simulator that allows a listener to compare and experience a plurality of sound fields in an audible room. It is in.

[0012]

In order to achieve the above object, the present invention is based on sound field design data to determine how a sound from a predetermined sound source in a sound field is heard at a predetermined sound receiving point. In a sound field simulator for simulating and forming a simulated sound field in an audible room, a sound field memory for storing simulation data of a plurality of sound fields, and a listener for selecting and operating an arbitrary sound field in the audible room are formed. Sound field selecting means, and sound field forming means for reading simulation data of the sound field selected by the sound field selecting means from the sound field memory and forming a simulated sound field in the audible room. It is characterized in that the listener can compare and experience a plurality of sound fields in the audible room by operating the selection means.

[0013]

As described above, in the sound field simulator of the present invention,
A plurality of sound field simulation data are stored in the sound field memory, and the listener can select an arbitrary sound field in the audible room.

Therefore, the listener can compare and experience a plurality of sound fields in the audible room, and particularly, the sound environment of the sound field at the current design stage and the sound field of another concert hall that already exist are continuous. By listening to each other, it is possible to objectively and accurately compare and evaluate the sound field in the design stage, and use it as a material for effective design change.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a preferred example of the acoustic simulator according to the present invention. The acoustic simulator of the embodiment includes an acoustic 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 the designed sound field data. including.

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

The CAD system 10 for acoustic design of the embodiment performs such a sound field design, and determines how the sound from the sound source 12 sounds at a predetermined sound receiving point 14 in this sound field. Calculation is performed based on the design data of the field, and the calculated simulation data is calculated by the calculation processing system 40.
It 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 the sound source 12 outputs an impulse sound wave in the sound field.
This impulse response is from the sound source 12 to the sound receiving point 14
Including a direct sound that directly arrives at, an initial reflected sound group that comes after being reflected from a reflective surface such as a ceiling or a wall surface, and a reverberant sound group (the density of the reflected sound increases with the passage of time,
Eventually 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 absorption and reflection of sound in the sound field.

CAD system 10 for acoustic design of the embodiment
Calculates the impulse response at the sound receiving point 14 by dividing the hemispherical surface centered on the sound receiving point into 12 directions and writing the result in the memory 42.

The audible room 100 simulating this sound field has a listening room 1 in which a listener sits in the center of the floor.
Ten are installed. Direct sound speakers 120R and 120L are arranged in front of the listening seat 110. Further, on the hemispherical surface around the listening seat 110, twelve speakers are provided so as to correspond to the 12 divided regions of the sound field. For reflected sound 122-1, 122-2 ... 122-12
Are arranged. In the embodiment, the speakers 122- are 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.

On the monitor 112 installed in front of the listening seat 110, the CAD system 10 for acoustic design is installed.
The sound field design image shown in FIG.
An image is displayed by the V system 30.

Then, the arithmetic processing system 40 processes 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, 1 via the amplifier 44
Direct sound is output from 20L, and the opposite sound corresponding to the impulse response for each direction is output from the twelve reflected sound speakers 122-1 122-2 ... 122-12.
As a result, in the audible room 100, a sound field similar to that when the sound from the sound source 12 of the sound field shown in FIG. You can actually experience the sound environment at the design stage.

It is preferable to use the dry source 20 recorded in the anechoic chamber as a sound source used for creating such a simulated sound field. However, in the sound field simulator of the embodiment, it is provided in the audible room 100. From the sound (real voice or live performance on the spot) collected by the installed sound collecting microphone 124, a simulated sound field is similarly created using this as a dry source.

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

In the present embodiment, the memory 42 includes a first memory area 42a and a second memory area 42b.

The first memory area 42a stores simulation data in the case of a mono sound source which does not use a speaker and simulation data in the case of a multi sound source which uses a speaker in the sound field shown in FIG. ..

The simulation data in the case of the mono sound source uses the CAD system 10 for acoustic design, and the sound source 1
This is simulation data obtained by calculation when 2 is located at the center of the stage and it is assumed that the sound source 12 is an omnidirectional sound source.

Further, the simulation data in the case of the multi-sound source is the data in the case where the sound source is the speaker setting position used in the sound field shown in FIG. When the left and right two-channel speakers are used, simulation data created by using the speaker setting positions as sound sources are used. In this case, it is necessary to create the 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 established in the sound field. The figure (a) is a waveform of all impulse responses, and the figure (b) is
Is an impulse waveform 200 of the direct sound, which is shown in FIG.
Are the impulse waveform 210 of the initial reflected sound and the impulse waveform 220 of the reverberant sound that are divided into 12 directions.
The impulse waveform of each of the initial reflected sounds 210 is stored as an impulse response for 500 ms after the sound wave pulse is output from the sound source 12 in order to reduce the burden of calculation by the calculation processing system 40. And 500m
The reverberant sound after s is obtained as an impulse response 200 of the same pattern as shown by the dotted line in the figure, and is set for each channel. The impulse response of the reverberant sound may be formed to overlap with the impulse response of the initial reflected sound for a certain period of time, if necessary.

In the second memory area 42b, simulation data of a plurality of sound fields other than the sound field under design are stored.

In the embodiment, as shown in FIGS.
Based on the design data of the sound field such as one hall, the simulation data of each hall are simulated and stored for the case of mono sound source and the case of multi sound source. 6 is a balcony type hall, FIG. 7 is a wineyard type hall, and FIG. 8 is a perspective view of each sound field in the listening room.

The dry source 20 of the embodiment is a CD
A player 20a, a DAT player 20b, a cassette player 20c, a disc player 20d, and a video deck 20e are included, and each output is input to the switch 22. In addition, the output of the microphone 124 installed in the audible room 100 is fed to the amplifier 1 by the switch 22.
It is designed to be input via 26. Then, the switch 22 arbitrarily selects each of these inputs under the control of a central control unit (not shown), inputs the audio signal included in the selected input signal to the arithmetic processing system 40, and outputs the video signal as an AV signal. It is configured to input to system 30.

The arithmetic processing system 40 of the embodiment includes a digital signal processor 60 and a DS for the digital signal processor.
And a P controller 50. The DSP controller 50 is the operation panel 1 installed in the audible room 100.
An input signal from 30 reads arbitrary simulation data from the memory 42, and controls the digital signal processor 60 based on the read simulation data.

That is, the operation panel 130 is the listening seat 1
It is formed so that a listener sitting on 10 can easily operate it, and specifically, a first operation unit 132 for selecting an arbitrary sound field and either a mono sound source or a multi sound source of the selected sound field. And a second operation unit 134 for selecting whether or not. Therefore, for example, the sound field at the design stage stored in the first memory area 42a is designated by the first operation unit 132, and the second
When a mono sound source is selected by the operation unit 134 of the DSP controller 50, the DSP controller 50 causes the first memory area 42a of the memory 42 to operate.
Therefore, the simulation data corresponding to the mono sound source in the sound field of the concert hall currently being designed is read out. Then, the DSP controller 50 arithmetically controls the digital signal processor 60 based on the simulation data thus read.

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

As a result, 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 audition room 110 can hear the sound shown in FIG. In the field, it is possible to actually experience a sound environment in which the sound of the mono sound source 12 can be heard at the sound receiving point 14.

The image data of the sound field selected on the operation panel 132 at this time is stored in the hall room type data memory 32.
And is displayed on the monitor 112 via the switch 34. That is, in the data memory 32,
The three-dimensional image data of each sound field stored in the memory 42 is stored respectively, and the image data corresponding to the sound field selected by the operation panel 130 is read out from the memory 32 each time, and via the switch 34. , Monitor 112
It is supposed to be displayed above.

Although the video signal is output from the disk player 20d and the video deck 20e used as the dry source 20 together with the audio signal, it is not shown when it is desired to display such a video signal on the display 112. Switching device 3 according to a command from the central control unit
4 may be controlled to select the input from the switch 22.

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

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

The first initial delay generator 64 delays the voice signal by the arrival time of the direct sound based on the impulse response of FIG. Control units 66R and 66L and reflected sound generation units 66-1, 66-2, ... 66-12 for 12 channels
Output to.

The direct sound generators 66R and 66L generate a direct sound by performing a convolution operation on the input voice signal and the impulse response shown in FIG. 4 (b). Then, the direct sound thus obtained 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.

Also, the reflected sound generation section 6 for 12 channels
Reference numerals 6-1, 66-2, ... 66-12 represent the dry reflection sound signals input from the first initial delay generation unit 64, and the initial reflection of each channel shown in FIG. The impulse response for sound is subjected to convolution calculation to generate the initial reflected sound for 12 channels heard from each direction.
The 12 channels of the initial reflected sound thus generated are DA amplifiers 44-1, 44-2 ... 44-
12 through 12 and corresponding reflected sound speakers 122-1, 122-2 ... 122-12 for output to the audible room 100.

Further, the second initial delay generator 68 is
A predetermined delay process is applied to the input dry source sound signal, and reverberation sound generation units 70-1 and 70-for 12 channels are provided.
2 ... Outputs to 70-12.

Reverberation sound generation section 70-170 for each channel
-2 ... 70-12 convolves the dry source sound signal input from the first initial delay generation unit 64 with the reverberation sound impulse response shown in FIG. , Reverberation sound for 12 channels is generated, and the reverberation sound generation units 66-1, 66-2 for each channel are generated.
66-12, digital amplifiers 44-1, 44-2 ... 44
-12 through the corresponding indirect sound speaker 122-
1, 122-2 ... 122-12 is output to the audible room 100.

The present embodiment has the above construction, 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 listener,
Sit in the listening room 110 of the audible room 100, operate the first operation unit 132 of the operation panel 130, and select the sound field at the design stage (corresponding to FIG. 2) stored in the first memory area 42a. .. Next, the second operation unit 134 is operated to select, as the sound source 12, a mono sound source that does not use a speaker or the like.

As a result, the DSP controller 50
Controls the digital signal processor 60 by reading from the first memory area 42a of the memory 42 the simulation data when the mono sound source 12 that does not use a speaker is used in the sound field in the design stage.

As a result, the digital signal processor 60 is
Direct sound is calculated from the sound signal input from the dry source 20, is output from the direct sound speakers 120R and 120L, and initial reflected sound and reverberant sound for 12 channels are calculated from the input sound signal, and the corresponding The reflected sound speakers 122-1 122-2 ... 122-12 are caused to output.

In this way, since the simulated sound field of the concert hall at the design stage is formed in the audible room 100, the listener sitting in the listening seat 110 can hear the mono sound source 12 of the sound field shown in FIG. It is possible to simulate how the sound from sounds at the sound receiving point 14.

If the listener wants to hear and compare a mono sound source without a speaker and a multi sound source with a speaker in the sound field at the design stage shown in FIG. The multi-sound source may be selected by operating the operation unit 134.

As a result, the DSP controller 50
Reads the simulation data for the multi-sound source in the sound field at the design stage stored in the first memory area 42a in the memory 42 and controls the digital signal processor 60 in the same manner.

As a result, when a plurality of speakers each having a predetermined directivity and frequency characteristic are installed at the speaker installation position 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 in the case where a mono sound source and a multi sound source are present in comparison.

Further, in order to compare the concert hall in the design stage shown in FIG. 2 with other concert halls shown in FIGS.
By operating the operation unit 132 of 1., an arbitrary sound field, for example, the sound field of the concert hall shown in FIG. 6 may be selected. As a result, the DSP controller 50 reads the simulation data of the selected sound field shown in FIG. 6 from the second memory area 42b of the memory 42 and controls the digital signal processor 60.

As a result, a simulated sound field of the selected concert hall shown in FIG. 6 is created in the audible room 100 almost at the same time as the operation of the first operation section 132, and the listener can
It is possible to experience the comparison between the concert hall at the design stage shown in FIG. 2 and the concert hall shown in FIG. 6, and listen to and compare the two for comparative evaluation.

In particular, in the sound field simulator of the embodiment, the viewer in the audible room 100 only operates the operation panel 130 at hand, and the sound field in the concert hall at the design stage shown in FIG. The sound fields of the four existing concert halls shown in 8 can be switched instantaneously, and each sound field can be continuously compared and experienced without any time lag, so this comparative evaluation result is effective for design. You can give us feedback.

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

[0060]

As described above, according to the present invention,
A sound field memory that stores simulation data of multiple sound fields in a sound field simulator that simulates how sounds from a predetermined sound source in the sound field are heard at the receiving point and forms a simulated sound field in the audible room. And a sound field selecting means formed so that the listener can select and operate any sound field in the audible room, whereby the listener can operate a plurality of sounds in the audible room by operating the sound field selecting means. It is possible to experience the comparison of the fields instantly and continuously, and to objectively and accurately evaluate the sound field. In particular, according to the present invention, it is possible to instantly compare the sound field of a concert hall or the like in the design stage with the sound fields of other already completed concert halls without waiting time, so that the evaluation is more objective. It can be used as an effective material for design feedback.

[Brief description of drawings]

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

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

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

FIG. 4 is a waveform diagram of impulse responses of a direct sound, a reflected sound, and a reverberant sound stored in the memory of FIG.

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

FIG. 6 is an overall perspective view of a sound field in a balcony type hall.

FIG. 7 is an overall perspective view of a sound field in a wineyard type hall.

FIG. 8 is an overall perspective view of a sound field in a listening room.

[Explanation of symbols]

20 dry source 40 arithmetic processing system 42 memory 60 digital signal processor 64 first initial delay generation unit 68 second initial delay generation unit 66R, 66L direct sound control unit 66-1, 66-2 ... 66-12 reflected sound Control unit 70 Reverberation sound control unit 100 Audible room 120R, 120L Direct sound speaker 122-1, 122-2, ... 122-12 Reflected sound speaker 130 Operation panel
TD005101

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location G10K 15/08 7227-5H G10K 15/00 A

Claims (1)

[Claims] 1. A sound field simulator for simulating 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, a sound field memory for storing simulation data of a plurality of sound fields, a sound field selecting unit formed so that a listener can select and operate an arbitrary sound field in the audible room, and the sound field selecting unit selects Sound field forming means for reading the simulation data of the sound field from the sound field memory and forming a simulated sound field in the audible room, and by operating the sound field selecting means, a listener can operate a plurality of sounds in the audible room. A sound field simulator characterized by being able to compare and experience the fields.