JPH02224600A - Sound field generating method - Google Patents

Abstract

PURPOSE:To generate a sound field in reply with the preference to a listener with a simple procedure by providing a memory storing a different reververation characteristic data from the type of a sound field, an operating section and a CPU or the like so as to execute a sound field generating processing program. CONSTITUTION:The reververation characteristic data depending on the shape of the sound field, that is, a circular hall, a rectangular hall and sector hole or the like and a high frequency attenuation characteristic data of reververation sound depending on the type of material of a reflecting wall are stored in a memory 13 of a parameter control circuit 11 in advance. Then when up-down keys of an operating section 15 are depressed simultaneously, a CPU 12 transits to the sound field generating mode and a sound field generating processing program is executed. That is, the sound field shape, size, type of material of wall and listening position in the sound field are set via the memory 13, a display section 14 and the parameter of the sound field is calculated. Thus, the sound field in replay with the preference to the user is generated with a simple operation by having only to operate the up-down key of the operation section 15 while observing the display of the display section 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for creating a sound field, and particularly to a method for creating a sound field in a desired concert hall, etc., while a listener is in a room or the like. In this method, a desired sound field can be created by setting the shape and size of the sound field and the material of the reflecting wall, and also specifying the listening position in the set sound field.

C. Conventional technology Conventionally, sound control devices have been proposed that create a sense of presence in a different acoustic space, such as a large concert hall or live studio, while the listener is in a normal listening room or room. has been done.

That is, as shown in FIG. 4, in this sound control device 1, for example, four speaker devices 3A, 3B, 3C13D are arranged on the left and right sides of the front and rear so as to surround the listener 2. .

As a result, audio signals SL and SR for two left and right channels obtained from a source 4, such as a compact disc device or a record player, are received by a sound field creation circuit 5 having a digital processing processor configuration, and are sent from a parameter control circuit 6. Various reverberation sounds etc. are added based on the input sound field parameter P.

In this way, the sound field creation circuit 5 creates audio signals SLF, 8 channels 1, SL, and 5II for the front, rear, left, and right channels, and sends these to the amplifier circuits 7A, 7B, and 7C17D, respectively.
After amplification in the corresponding speaker devices 3A to 3D
supply to.

In this way, the sound control device 1 generates four channels of audio signals SLF, to which various reverberation sounds, etc. have been added,
By emitting S□, SLR, and S□ from the speaker devices 3A to 3D, the listener 2 can listen to the sound field SPS as another acoustic space, such as a large concert hall, etc., while being in a normal listening room or room. , so that you can experience the realism of being in a live studio or the like.

D Problems to be Solved by the Invention By the way, in the acoustic control device 1 having such a configuration, the listener 2 uses the parameter control circuit 6 to determine the sound field parameters P for reproducing the sound field SPS of a concert hall or the like. In order to create the , it is necessary to perform various parameter settings.

As shown in Figure 5, the sound field parameters P that reproduce the sound field SPS include the volume level of the direct sound DIIY, the volume level and interval of the early reflected sound E IFL, and the delay from the direct sound D□. Time τ7□, volume level of reverberant sound R1V and direct sound. There are delay time τ□v1 from It won't happen.

However, such parameter settings cannot be carried out unless one is numerically familiar with the acoustic characteristics of the sound field SPS in a concert hall, etc.; It was practically impossible to reproduce P as desired.

For this reason, the acoustic characteristics of a typical sound field such as a concert hall, which has been determined in advance using conventional methods such as measurement and calculation, are stored in internal memory, and these acoustic characteristics are used to simplify the parameter settings described above. , an acoustic control device has been proposed that allows even general listeners to create a desired sound field within a predetermined range (Japanese Patent Laid-Open No. 61-257099).
Publication No.).

In other words, in such an acoustic control device, first, the reflected sound data of a predetermined concert hall, etc. is measured by acoustic distribution measurement using the time difference of impulse responses in the concert hall, etc., or based on the shape of the wall surface of the concert hall, etc. It is determined from the calculated virtual acoustic distribution, etc.

Next, from this reflected sound data and the arrangement of speaker devices such as a listening room used to reproduce the sound field, sound field parameters consisting of reflected sound parameters to be emitted by each speaker device are calculated and stored in a memory etc. Remember.

As a result, when listening to audio, each reflected sound of the audio signal obtained from the source is created based on the sound field parameters stored in memory, and the corresponding direction and
By making it possible to faithfully reproduce the reflected sound in an actual concert hall or the like, it is possible to experience the sense of being in a concert hall or the like in a listening room or the like.

However, even with this method, it is actually possible to create a sound field only within the range of the sound field parameters stored in memory, etc., and when changing the listening position or the size of the sound field, requires complicated operations based on complex calculations, and is still unsatisfactory in terms of usability for listeners.

The present invention has been made in consideration of the above points, and aims to propose a sound field creation method that can create a sound field according to the listener's preference using simple procedures.

Means for Solving Problem EIn order to solve this problem, in the present invention, the sound field S
Shape setting means SP2 for setting the shape of PS, and sound field SP
A capacity setting means SP3 for setting the size of S, and a sound field SP
Wall setting means SP4 for setting the material of the reflective wall S, shape setting means SP2, capacity setting means SP3 and wall setting means S
A listening position specifying means SP5 for specifying a listening position in the sound field SPS set by P4 is provided.

A desired sound field SPS can be created by selecting the shape and size of the F acting sound field SPS and the material of the reflecting wall, and by specifying the listening position in the selected sound field SPS.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 2, in which parts corresponding to those in FIG. A display section 14 consisting of a liquid crystal display and an operation section 15 consisting of up/down keys are connected.

In the case of this embodiment, the memory 13 of the parameter control circuit 11 stores in advance reverberation characteristic data that differs depending on the shape of the sound field SPS, that is, a circular hall, a rectangular hall, a fan-shaped hall, etc., and also reverberation characteristics that differ depending on the material of the reflecting wall. High frequency attenuation characteristic data of sound is stored.

Further, in this parameter control circuit 11, for example, by simultaneously pressing the up and down keys of the operation section 15, the CPU 12 shifts to the sound field creation mode and executes the sound field creation processing program SPI shown in FIG.

That is, the CPU 12 executes the sound field creation processing program SPI.
In the next step SP2, the sound field SPS
Execute the shape setting process.

In this step SP2, the CPU 12 performs the
), for example, a "circular hole" is displayed on the display section 14 of the operation panel 16 as the initial value of the hole shape indicating the sound field SPS.

In this state, the listener 2 presses the up key 15A of the operation section 15.
Alternatively, if the down key 15B is pressed, the CPL 112 sequentially cyclically displays hole shapes representing the sound field SPS, such as "rectangular hall", "fan-shaped hall", "circular hall", etc. stored in the memory 13 in advance.

As a result, if the listener 2 presses the confirmation key 15C of the operation unit 15 when the desired hole shape is displayed,
The PU 12 reads the reverberation characteristic data corresponding to the designated hall shape from the memory 13 to the work area, and proceeds to the subsequent step SP3 to execute a process for setting the size of the sound field SPS.

In this step SP3, the CPU 12 performs the steps shown in FIG.
), the display unit 14 of the operation panel 16 displays an initial value [100 m2] representing the size of the hole having the shape specified in step SP2 in terms of volume.

In this state, the listener 2 presses the up key 15A of the operation section 15.
Alternatively, if the down key 15B is pressed, the CPU 12 displays the number representing the volume up or down in a predetermined step amount.

As a result, when the listener 2 presses the confirmation key 15C of the operation unit 15 when the desired volume is displayed, the CPU 1
Step 2 stores the specified hole size in the work area, and moves to the next step SP4 to execute wall material setting processing.

In this step SP4, the CPU 12 performs the steps shown in FIG.
), the display section 14 of the operation panel 16 displays "5 trees" representing the reflection coefficient and material of the wall of the hole having the shape specified in step SP2.

In this state, the listener 2 presses the up key 15A of the operation section 15.
Alternatively, if the down key 15B is pressed, the CPU 12 sequentially cyclically displays data representing the reflection coefficient and material of the wall, such as "4 Cloth", "3 Concrete", "2 Marble", etc. stored in the memory 13 in advance.

As a result, when the listener 2 presses the confirmation key 15C of the operation unit 15 when the desired reflection coefficient and material of the wall are displayed, the CPU 12 selects the desired reflection coefficient and material of the wall. The high-frequency attenuation characteristic data is stored in the work area, and the process moves to the subsequent step SP5 to execute the process of setting the listening position.

In this step SP5, the CPU 12 performs the steps shown in FIG.
), the display section 14 of the operation panel 16 displays "Left-right position O" representing the center position as the initial value of the left-right listening position in the hall having the shape and size specified in steps SP2 and SF3. conduct.

In this state, the listener 2 presses the up key 15A of the operation section 15.
Alternatively, if the down key 15B is pressed, the CPU 12 displays the number representing the position up or down in a predetermined step amount.

As a result, when the listener 2 presses the confirmation key 15C of the operation unit 15 when the desired listening position is displayed, the CP
U12 stores the specified values of the left and right listening positions in the work area, and then displays "front/back position O" representing the center position as the initial value of the front/back listening positions.

In this state, the listener 2 presses the up key 15A of the operation section 15.
Alternatively, if the down key 15B is pressed, the CPU 12 displays the number representing the position up or down in a predetermined step amount, similar to the above-mentioned left and right positions.

As a result, when the listener 2 presses the confirmation key 15C of the operation unit 15 when the desired listening position is displayed, the CP
U12 stores the numerical values of the specified front and rear listening positions in the work area, and moves to the next step SP6.

In this step SP6, the CPU 13 outputs reverberation characteristic data corresponding to the shape of the hall stored in the work area, high-frequency attenuation characteristic data of reverberant sound corresponding to the wall material, and early reflection sound calculated based on the size of the hall shape. E□,
Sound field data is created using the interval, and the volume balance between the left and right speaker devices 3A and 3B, 3C and 3D and the front and rear speaker devices 3A and 3B are determined based on the listening position specified in step SP5 above. After calculating the volume ratio of the direct sound D□ and the reverberant sound REV in 3C13D and storing this in the memory 13 as the sound field parameter PI4, in the next step SP7,
The sound field creation processing program SPI is ended.

In this way, the listener 2 can set the desired sound field SPS by simply operating the up/down keys 15A to 15C of the operation unit 15 while visually checking the display on the display unit 14, which is a liquid crystal display. can be created.

Furthermore, the sound field parameters P, created in this way and stored in the memory 13, are stored in the memory 13 by the CPU 12 of the parameter control circuit 11 during actual audio listening.
The signal is read from and supplied to the sound field creation circuit 5.

As a result, the audio signals SL and SIl for the two left and right channels are input from the source 4 to the sound field creation circuit 5.
, various reverberant sounds etc. are added according to the sound field parameter P, and as a result, the audio signal 5LFSSL for four channels of front, rear, left and right is sent out from the sound field creation circuit 5,
11S□ and SIR are amplified in amplifier circuits 78 to 7D, respectively, and then supplied to corresponding speaker devices 3A to 3D.

In this way, this sound control device 1O can be used to create a sound field SPS in a different acoustic space desired by the listener 2, such as a large concert hall, a live studio, etc., while being in a normal listening room or room. It is designed to evoke a feeling.

According to the above method, the shape and size of the sound field SPS and the material of the reflecting wall are set respectively, and the listening position in the set sound field SPS is specified thereby, which allows easy operation. A sound field creation method that can create a desired sound field sps can be realized.

Furthermore, according to the above method, the display on the display unit can be visually checked f+1.
12, it is possible to create a desired sound field with the simple operation of operating the up/down keys, thereby significantly improving usability for the user who is the listener.

Furthermore, according to the above method, the sound field parameters PM created in the sound field creation processing program SPI, for example
By displaying the information on a screen or printing it out, it is possible to realize a sound field creation method useful for designers of concert halls, for example.

In the above embodiment, the shape and size of the sound field, the material of the reflecting wall, and the listening position in the sound field set by these parameters are specified as parameters to be set when creating the sound field. In addition to, for example, temperature, weather,
It may also be possible to specify parameters such as atmospheric parameters such as humidity and data on the number of customers.

Furthermore, in the above embodiment, the listening position in the set sound field is specified two-dimensionally, but the invention is not limited to this, and it may be specified three-dimensionally including the height direction. .

Furthermore, in the above embodiment, the shape of the hole, the size, and the material of the wall are set in this order, but the setting order is not limited to this, and the size or material of the wall may be set first. Also, the same effect as the above embodiment can be achieved.

Further, in the above-described embodiment, a case was described in which a liquid crystal display and up/down keys were used as the display unit and the operation unit, but the present invention is not limited to this. For example, in an image display device using a cathode ray tube, CAD (computer aided) using mouse, keyboard, etc.
It is also possible to create a hole shape using the method described in "Design" and specify the size, wall material, etc. for the created hole shape.

Incidentally, by doing this, the user can create the sound field while visually checking the hole shape.
Usability can be further improved.

H Effects of the Invention As described above, according to the present invention, the shape and size of the sound field and the material of the reflecting wall are set respectively, and the listening position in the set sound field is specified accordingly. , it is possible to realize a sound field creation method that can create a desired sound field with simple operations.

In this way, user-friendliness can be further improved.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing a sound field creation processing procedure according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of an acoustic control device that executes the sound field creation processing procedure, and FIG. 3 is a sound field creation processing procedure. FIG. 4 is a block diagram showing a conventional sound control device, and FIG. 5 is a characteristic curve diagram showing characteristics of sound field parameters. 1.10... Sound control device, 2... Listener, 3A to 3D... Speaker device, 4...
...Source, 5...Sound field creation circuit, 6.11
...Parameter control circuit, 7A to 7D...
・・Amplifier circuit, 12・Old・・CPU, 13・・・・・
Memory, 14...old display section, 15...operation section. Implementation IJ's i1 notice 1 2nd circle (A) CB) waste (C) CD) Sound field I 50 3 Figure

Claims (1)

[Scope of Claims] Shape setting means for setting the shape of the sound field; capacity setting means for setting the size of the sound field; wall setting means for setting the material of the reflective wall of the sound field; A sound system comprising a setting means, a listening position specifying means for specifying a listening position in the sound field set by the capacity setting means and the wall setting means, to create the sound field. How to create a place.