JP2000224700A - Sound field control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply an acoustic effect optimum for each room space to an audience in the case of sound field control in indoor space such as the inside of a hall. SOLUTION: When the number of input systems from sound collecting means 102a and 102b for picking up the sounds of a sound source is defined as N and the number of output systems to speakers 106a-106d for discharging the sounds to indoor space is defined as N, N×M pieces of sound field control means 104 are provided corresponding to each combination of respective input systems and respective output systems. Besides, acoustic characteristic data are found by simulating or measuring the indoor space, sound field control data are generated by arbitrarily editing these acoustic characteristic data, these sound field control data are programmed in the sound field control means 104 and the sound field control means 104 generate the output of speakers reflected with these sound field control data. By reflecting the characteristics of an electric loudspeaker system with the sound field control data, the architectural acoustic effect in indoor space is electrically changed or emphasized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound field control device for electrically changing or enhancing the architectural acoustic effect of an indoor space such as a theater or a hall, and more particularly to a sound field control device corresponding to the positions of sound sources and speakers and the shape of the room. , Which makes it possible to optimize sound effects.

[0002]

2. Description of the Related Art Heretofore, in order to improve the acoustic effect of a hall or the like, reverberation machines, which are means for adjusting the reverberation, have been used to enhance the reverberation and loudness at the audience seats.

[0003] Also, Japanese Patent Application Laid-Open No. 3-89700 discloses that
In an audio loudspeaker for loudspeaking the sound of a performer on a stage with a plurality of speakers, a sound signal collected by a plurality of microphones is subjected to necessary time delay and amplification using a delay device and an amplification device, and Make the necessary additions and distributions,
A method is described in which the localization direction of a sound image radiated from each speaker matches the direction of a sound source (actor).

[0004] Japanese Patent Publication No. 2568972 describes a sound field control device capable of creating a sound field close to an actual indoor hall in an outdoor space. This device assumes a virtual wall surface of a virtual hall outdoors, and uses several positions on the virtual wall surface as simulation points, and arranges a sound field control speaker near the point. Then, when the sound is emitted from the actual sound source, the virtual reflected sound synthesizing unit synthesizes the virtual reflected sound signal at the simulation point and supplies it to each sound field control speaker, and generates the virtual reflected sound from each speaker. Make sound.

The virtual reflected sound synthesizing unit performs a convolution operation between the sound signal of the sound source and the reflected sound parameter using an FIR filter in which the reflected sound parameter is incorporated, and synthesizes a virtual reflected sound signal at a simulation point.

By doing so, it is possible to obtain an acoustic effect as if playing in an indoor hall, even when performing in an outdoor venue.

[0007]

However, the conventional sound field control device cannot perform precise sound field control according to the indoor shape of a theater or a hall. In addition, in a loudspeaker system that electrically loudspeaks the sound on the stage, it is necessary to localize the sound image.However, with conventional devices, the sound effect in the indoor space is changed and enhanced while realizing the sound image localization. Fine sound field control cannot be performed.

In the method using a reverb machine,
Although a method of adjusting the sound effect according to the volume of the room or the like is known, an adjustment method corresponding to a more realistic situation such as the shape of the room and the positions of the speaker and the performer has not been established.

The present invention solves such a conventional problem, and performs a precise sound field control on a room to be controlled in consideration of the room shape and the positions of speakers and performers. It is an object of the present invention to provide a sound field control device that can change and enhance the acoustic effect of an indoor space while localizing a sound image, which is a mission of an electric loudspeaker system.

[0010]

Therefore, in the sound field control apparatus of the present invention, the number of input systems from the sound collection means for collecting the sound of the sound source is N, and the number of output systems to the speaker for emitting sound to the indoor space. Is M, N × M sound field control means corresponding to each combination of each input system and each output system are provided. In addition, acoustic characteristic data is obtained by simulation or actual measurement of an indoor space, and the acoustic characteristic data is arbitrarily edited to generate sound field control data. Then, the sound field control data is incorporated into the sound field control means, and the sound field control means is configured to generate a speaker output reflecting the sound field control data.

By reflecting the sound field control data on the characteristics of the electric loudspeaker system, the architectural acoustic effect in the indoor space is electrically changed or enhanced. With this sound field control device, it is possible to perform sound field control according to the sound source position and sound source type, and since the control form takes into account the room shape, a more optimal sound field construction is possible according to the situation. Becomes possible.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a theater, in which sound from one or a plurality of sound sources such as speakers, performers, musical instruments, etc. is emitted through an electric loudspeaker system.
In a sound field control device for controlling a sound field in an indoor space such as a hall, a public hall, a broadcasting studio, and a recording studio, the number of input systems from sound collecting means for collecting sound of a sound source is N, and the speaker emits sound to the indoor space. Assuming that the number of output systems to the system is M, N × M sound field control means corresponding to each combination of each input system and each output system are provided, and each of the sound field control means Generates speaker output by reflecting sound field control data obtained by performing arbitrary editing on acoustic characteristics data obtained from simulations for simulations or simulations assuming virtual walls in indoor space or actual measurements in indoor spaces Then, the architectural acoustic effect of the indoor space is electrically changed or enhanced. The sound field control means is configured in accordance with the number of input systems such as the number of microphones and sound sources involved in sound pickup and the number of output systems such as the number of speakers to be output, and controls one input system and one output system corresponding thereto. One sound field control means is assigned. Therefore, the total number of sound field control means is the number of input systems × the number of output systems.

According to a second aspect of the present invention, the sound field control means includes a sound image localization adjusting device including a delay circuit and a signal level adjusting circuit, and a signal processing device including an FIR filter and a signal level adjusting circuit. A device is provided to generate the output of the speaker by reflecting the sound field control data on the filter characteristics of the FIR filter. The sound image localization adjustment device performs time delay and signal level adjustment for performing loudspeaking so that sound image localization is realized at the listening position, and the signal processing device performs sound field control data that changes or enhances the acoustic characteristics of the indoor space. Has the function of reflecting the characteristics of the electrical loudspeaker system. This makes it possible to simultaneously achieve the effect of improving the sense of volume while realizing the sound image localization and the sound effect of changing or enhancing the sound characteristics.

According to a third aspect of the present invention, the sound image localization adjusting device and the signal processing device are connected in parallel.
An input signal is branched into two systems, localization adjustment is performed on one of the signals, processing for changing or enhancing acoustic characteristics is performed on the other signal, and the signals are mixed and output.

According to a fourth aspect of the present invention, the sound image localization adjusting device and the signal processing device are connected in series.
No need for branching or mixing means, a simple system,
The effect of improving the sense of volume while realizing sound image localization and the sound effect of changing or enhancing sound characteristics can be realized at the same time.

According to a fifth aspect of the present invention, in the sound field control device of the third aspect, a pulse time and a pulse level of an impulse response or an echo time pattern in an indoor space are obtained by simulation or actual measurement, and the pulse level is edited. The sound field control data obtained as described above is reflected on the filter characteristics of the FIR filter. That is, sound characteristic data such as an impulse response is obtained by simulation or actual measurement, and then the obtained sound characteristic data is processed to create sound field control data. The acoustic characteristic data is obtained according to the following procedure.

According to the indoor building shape to be controlled,
Create an analysis model for performing a simulation. If the shape has an acoustic defect or the acoustic effect is to be emphasized, the analysis model is appropriately changed. Further, the analysis model reflects sound absorption data and acoustic impedance data of a material used on the indoor wall surface.

Subsequently, sound source positions of speakers, performers, musical instruments, etc. on the stage are determined, and omnidirectional point sound sources for simulation or directivity according to assumed sound source types are set at corresponding positions in the analysis model. A simulation sound source having characteristics is set.

Next, an analysis point for obtaining acoustic characteristic data is set at or near the position of the output speaker used for control. This point may be an "area" having a certain size.

Then, acoustic simulations such as the virtual image method are carried out, and the sound wave emitted from the sound source arrives at the prayer point via various paths.
An incident path and an impulse response or an echo time pattern are obtained as acoustic characteristic data.

Next, sound field control data is created by processing the obtained acoustic characteristic data. The incident direction of the sound wave and the impulse response or the echo time pattern are compared and examined, and those that do not affect the listener or have an adverse effect are extracted from the pulse train and are deleted from the data. The data determined in this way is used as sound field control data as FIR in the signal processing means.
Incorporate as filter characteristics.

The acoustic characteristic data such as the impulse response is not limited to the simulation, but may be obtained by setting a measurement point corresponding to an analysis point in the real space and performing actual measurement there.

By passing the signal to be amplified through this filter, it is converted into a signal that changes or enhances the acoustic effect of the indoor space.

According to a sixth aspect of the present invention, in the sound field control device of the fourth aspect, the pulse time and the pulse level of the impulse response or the echo time pattern in the indoor space are obtained by simulation or actual measurement. The sound field control data obtained by editing the time series is reflected in the filter characteristics of the FIR filter. In the sound field control device according to the fourth aspect, since the sound image localization adjustment device and the signal processing device are connected in series, it is necessary to create sound field control data in consideration of the delay processing performed by the sound image localization adjustment device. is there. Therefore, when sound field control data is created by processing acoustic characteristic data obtained by simulation or actual measurement, the incident direction of the sound wave is compared with the impulse response or echo time pattern, and the sound wave is extracted from the pulse train. After extracting those that do not affect the listener or those that have an adverse effect as effects, and deleting them from the data, the data is corrected with the delay time set in the delay circuit built into the sound image localization adjustment device Then, sound field control data is obtained.

According to a seventh aspect of the present invention, in the sound field control device of the third aspect, the pulse level is edited so as to be in accordance with psychological data relating to the sound image localization obtained in the psychoacoustic experiment. By editing such sound field control data, it is possible to convert the sound field control data into data that gives the listener a more prominent sense of localization.

According to an eighth aspect of the present invention, in the sound field control device of the fourth aspect, the pulse level after editing the time series of the pulse time is made to follow the psychological data relating to the sound image localization obtained in the psychoacoustic experiment. By editing such sound field control data, the sound field control data can be converted into data that gives the listener a more remarkable sense of localization of the sound image.

According to a ninth aspect of the present invention, as the speakers, a plurality of speakers are arranged in a concentrated manner, sound field control means are connected to each of the speakers, and each of the sound field control means comprises a sound source of each speaker. The sound field control data corresponding to the output direction is reflected on the filter characteristics of the FIR filter, and a plurality of directionally controlled speakers are arranged uniformly, for example, in a hemispherical shape. An independent signal is input to the speaker alone.

According to the tenth aspect of the present invention, the sound output direction data corresponding to each speaker is classified by comparing the sound output direction data obtained by simulation or actual measurement with the sound output direction of each speaker. The sound field control data edited from the sound output direction data is incorporated into the filter characteristics of the FIR filter of the sound field control means connected to the corresponding speaker. Thus, by creating sound field control data according to the direction of each speaker, more realistic and tight sound field control can be performed.

According to an eleventh aspect of the present invention, in the sound field control device of the third aspect, an impulse response of the indoor space is obtained by simulation or actual measurement, and an inverse phase function of the impulse response and a sound effect from the impulse response are obtained. A superposition calculation is performed with a function from which a pulse component that causes deterioration is removed, and the obtained function is reflected as sound field control data in the filter characteristics of the FIR filter. As a result, the sound wave path that seems to have an adverse acoustic effect is canceled by the output from the speaker, and the sound wave path is enhanced with respect to the other sound wave paths.

According to a twelfth aspect of the present invention, in the sound field control device of the fourth aspect, the impulse response of the indoor space is obtained by simulation or actual measurement, and the acoustic effect is degraded from the inverse phase function of the impulse response and the impulse response. A function obtained by removing a pulse component that causes the superposition calculation is superimposed, and a function obtained by adjusting the time series is reflected on the function as sound field control data in the filter characteristics of the FIR filter. This allows
The sound path that is deemed to have an adverse acoustic effect is canceled by the output from the speaker, and is enhanced with respect to the other sound paths.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 shows the configuration of a sound field control device according to a first embodiment. Sound collecting microphones 102a and 102b are installed on a stage 101 of a theater to be controlled by the sound field control device, and a sound source 103 such as a CD is arranged beside the stage 101. Output means 106a to 106d such as speakers for emitting sound are arranged.

The sound field control means 104 of the sound field control device includes sound pickup microphones 102a and 102b and a sound source 103 such as a CD.
An audio signal to be output to the output units 106a to 106d is generated from the input audio signal. This signal is amplified by the amplifying unit 105, output to the output units 106a to 106d, and emitted from the output units 106a to 106d into the indoor space.

The sound field control means 104, as shown in FIG.
A plurality of sound field control means 202a to 202l are provided. The number of the sound field control means 202a to 202l is determined according to the number of input systems indicating the number of microphones and sound sources related to sound collection, and the number of output systems indicating the number of speakers to be output. One sound field control means is assigned to one corresponding output system. Therefore, the total number of sound field control means is the number of input systems × the number of output systems.

In FIG. 2, inputs 201a to 201c are respectively connected to 102a, 102b and 103 in FIG.
a to 203d are connected to 106a to 106d in FIG. 1, respectively.

As shown in FIG. 3, each sound field control means includes a signal branching means 302 for branching an input signal into two systems.
In order to realize sound image localization at the listening position with respect to the branched signal, a time for performing loudspeaking is delayed, and a localization adjusting means 303 for adjusting a signal level, and for the other branched signal, A signal processing means 304 for performing FIR filtering and signal level adjustment to change or enhance the acoustic characteristics of the space; and a signal mixing means 305 for mixing output signals of the localization adjustment means 303 and the signal processing means 304. And

The localization adjusting means 303 comprises a delay circuit and a signal level adjusting circuit.
Is composed of an FIR filter and a signal level adjusting circuit.

An input 301 to be input to the sound field control means 300
Are divided into two systems by a signal branching unit 302 and input to a localization adjusting unit 303 and a signal processing unit 304, respectively.

The localization adjusting means 303 delays the signal so as to establish the sound image localization and adjusts the level. This is a conventionally known technique, and a detailed description thereof will be omitted.

The signal processing means 304 changes or enhances the sound effect by using an FIR filter and a signal level adjuster. The FIR filter incorporates sound field control data, and the FIR filter uses the sound field control data to perform a convolution operation on an input audio signal to convert a sound effect.

The outputs of the localization adjusting means 303 and the signal processing means 304 are combined into one system by the signal mixing means 305 and become the output 306 of the sound field control means 300.

As described above, the sound field control means can output a loudspeaker signal for realizing sound image localization and also output a signal for changing or amplifying the sound effect at the same time. It is possible to achieve sound effects at the same time. In addition, by stopping the output of the signal processing unit 304, it is possible to realize only the sound image localization loudspeaker, and by stopping the localization adjustment unit 303, only the change or enhancement of the sound effect is realized. Is possible. As a result, it is possible to select a usage method according to the application.

Each of the sound field control means 202a to 202
In 202l (FIG. 2), sound field control data, sound field control parameters for setting a delay time, an adjustment level, and the like are input according to the corresponding input system and output system. For example, the sound field control parameters of the sound field control means 202f are determined by the conditions of the input system 201b and the output system 203b. This makes it possible to control the sound field according to the position and type of each sound source and the position and type of the speaker that outputs the loudspeaker. Further, the number of input systems and the number of output systems of the sound field control means vary according to the number of connected sound source systems and the number of output systems.

Next, a method of creating sound field control data set in the FIR filter of the signal processing means will be described.

FIG. 5 is a schematic view of an indoor facility to be controlled. Sound sources 502a and 502b such as speakers, performers, and musical instruments are present on the stage 501, and control speakers 503a to 503d are installed on or near a wall surface. The control speakers 503a to 503d may be existing equipment or may be newly added for control. Sound field control data required for performing sound field control on this space is created by simulation.

First, a simulation model is created,
In addition, the room shape is changed so that the sound effect can be realized. If there is an acoustic effect at present or if it is desired to enhance the present spatial impression effect as it is, there is no need to change the room shape, and a simulation model is created with the same shape.

FIG. 6 shows a simulation model in which the interior shape is changed. Here, the stage 601 is changed, and the surroundings are surrounded by a stage reflector 602 to enhance the sound effect. Elements that determine the acoustic characteristics of the space, such as the sound absorption characteristics and the acoustic impedance characteristics of the surrounding wall surface, are known and are reflected in the simulation. A position corresponding to the position of the speaker / instrument / player in the real space is determined by a simulation model, and the sound source 603a and the
603b is defined. Also, as the sound source type for simulation, a non-directional point sound source that radiates sound uniformly in all directions or a sound source having directional characteristics and frequency characteristics corresponding to a sound source in real space is set. Then, a simulation point 605 is set on the vibration surface of the speaker 604 to be controlled. This simulation point 605 is not limited to the speaker vibration surface,
It may be a wall near the speaker, and not a point,
The area may have a finite size.

As described above, after setting the sound source 603 and the simulation point 605, a simulation is performed on the sound wave state at the simulation point 605 when sound is emitted from the sound source, and acoustic characteristic data is obtained.

As a simulation method, the sound source 603
The sound wave radiated from is incident on and passes through the simulation point 605 under the influence of the architectural characteristics of the indoor space, and the apparent "radiation path / radiation direction" and time series characteristics radiated from the simulation point 605 Any method may be used as long as the "impulse response" or "echo time pattern" indicating the above can be grasped as acoustic characteristic data.

Currently established techniques include a virtual image method for performing a simulation based on the relationship between a virtual image sound source and a simulation point of the sound source with respect to all indoor walls of the sound source,
When a sound ray is emitted from the sound source to the surroundings and hits the wall, energy attenuation according to the sound absorption characteristics of the wall and reflection according to the reflection angle corresponding to the incident angle of the wall are performed, and the sound is reflected at the simulation point or simulation area. There is a sound ray method for simulating incident sound waves.

FIG. 7 is an explanatory diagram of a simulation technique using the virtual image method. A sound source 701a is arranged in the simulation target room 700, and walls around the room 702a to 702f
It is composed of It is assumed that the sound absorption coefficient and acoustic impedance of the wall surface are known. In this state, the state of the sound wave at the simulation point 703 is observed.

The virtual image sound source 701b with respect to the wall 702b of the sound source 701a
In consideration of the above, the intersection between the line segment connecting the virtual image sound source 701b and the simulation point 703 and the wall surface 702b is defined as a reflection point 704. At this time, assuming that the light is specularly reflected on the wall surface 702b, the sound wave radiated from the sound source 701a and reflected at the reflection point 704 and arrives at the simulation point 703, and the sound wave radiated from the sound source 701a and directly arrives at the simulation point 703 Are observed at the simulation point, and the “incident radiation path / incident radiation direction” of the acoustic characteristic data is obtained.

The arrival time is calculated from the length of the sound path and the speed of sound, and the magnitude of the arrival time is determined by the intensity of sound radiated from the sound source, the directional characteristics of the radiation direction, the sound absorption characteristics of the reflecting wall,
Then, it can be calculated from the distance attenuation characteristic and the air absorption attenuation characteristic with respect to the length of the passage route. As a result, an "echo time pattern" of the acoustic characteristic data is obtained.

As described above, the simulation was performed using various methods, and as a result, the simulation point 60 shown in FIG.
The path and direction information of the sound wave passing through 5 is obtained as shown in FIG. 8, and the echo time pattern is obtained as shown in FIG.

Next, the acoustic characteristic data thus obtained is processed and edited to create sound field control data. As one of processing and editing, the sound wave incident direction and the impulse response or echo time pattern are compared and examined, and those that do not affect the listener as sound effects are extracted from the pulse train and deleted from the data. I do.

For example, when it is anticipated that the passing route 803a among the passing route information 803a to 803c in FIG. 8 is acoustically ineffective, the passing route 803a in the echo time pattern shown in FIG. Create the data by deleting the corresponding 901a. That is, data as shown in FIG. 10 is created as the sound field control data.

The data determined in this way is incorporated into the FIR filter characteristics of the signal processing means 304 as sound field control data.

The acoustic characteristic data such as the impulse response is not limited to the simulation, but may be obtained by setting a measurement point corresponding to the simulation point in the real space and performing actual measurement there.

When the signal to be amplified passes through the FIR filter, it is converted into a signal that changes or enhances the acoustic effect of the room.

If there is data that has an adverse acoustic effect in the acoustic characteristic data and it is necessary to cancel the data of the sound wave path that has an adverse acoustic effect, the sound field control is performed as follows. Set the data.

Now, it is assumed that the direction information of the simulation point is as shown in FIG. 8 and the impulse response is as shown in FIG. As a result of the examination, the passage route information 803a to 803a in FIG.
If it is determined that the passing path of 803a has an adverse acoustic effect in 3c, the impulse response shown in FIG. 9 is processed to delete the pulse of 901a corresponding to the passing path 803a. Create a response.

Next, an antiphase function of the impulse response shown in FIG. 9 is obtained. This antiphase function is as shown in FIG. The antiphase function shown in FIG. 30 and the function shown in FIG. 10 excluding the part that adversely affects the sound from the constituent pulses of the impulse response are superimposed and calculated, and the sound field control data created in this way is processed by the signal processing unit 304 shown in FIG. Incorporate in the filter characteristics of By doing so, it is possible to cancel the sound of the sound wave path that adversely affects the sound, and perform the sound field control in which the sound effect is changed or enhanced.

The sound field control data obtained in this way is
Further, a method of processing and editing data to establish sound image localization will be described.

Now, it is assumed that data as shown in FIG. 12 has been obtained as sound field control data. For this data,
The magnitude of the data is processed by applying a psychological curve or a psychological straight line relating to time and magnitude indicating conditions for establishing sound image localization.

This mental straight line is represented as shown in FIG. 13 as described in Japanese Patent Application Laid-Open No. 3-89700. That is, the psychological straight line 1304 is obtained after the sound wave information 1301a.
It shows the conditions of Δt and ΔL for establishing sound image localization when sound wave information 1301b having a time difference of Δt1302 and a magnitude difference of ΔL1303 is generated. The percentage 1305 of the psychological straight line 1304 indicates “what percentage of the listeners can hear the sound image separately under the condition of Δt · ΔL”.
In other words, the lower the percentage 1305 is, the easier the sound image localization is.

FIG. 14 shows a state in which the percentage 1305 is selected according to the application situation and the slope of the corresponding straight line is applied. The intercept of the psychological line 1401 is matched with the size corresponding to the smallest spatial data and time information. And
The size of each piece of spatial data information is adjusted so as to match the psychological line 1401. The result is shown in FIG. The sound field control data processed and edited in this way is converted into the FIR signal processing means.
Incorporate as filter characteristics.

Next, a configuration for controlling a sound field in a room by arranging a plurality of loudspeakers intensively at simulation points will be described. FIG. 19 shows a plurality of speakers 1902a to 1902e that are intensively arranged near the wall surface 1901.

The speakers 1902a to 1902e are arranged such that the directional area covers the entire space on the wall. FIG. 20 shows an input system to each speaker. The inputs 2002a to 2002e to the respective speakers 2001a to 2001e are individually connected, and are connected to the respective output systems of the sound field control means in FIG.

Each speaker outputs an individual sound field control signal. By giving the speaker a direction and arranging it in this way, it becomes possible to output a sound field control signal corresponding to each direction, so that a more realistic spatial impression can be given to the listener. Becomes

Next, the processing and editing of the sound field control data corresponding to each speaker when the speakers are concentratedly arranged will be described.

Assume that sound field control data (spatial information) at a simulation point is obtained as shown in FIG.
It is assumed that the direction information corresponding to each piece of space information in FIG. 21 is as shown in FIG. Point 2202 near wall 2201 in FIG.
Represents a simulation point. The information 2101a to 2101e in FIG. 21 corresponds to the direction information 2202a to 2202e in FIG. 22, respectively.

It is assumed that control speakers corresponding to the simulation points are arranged as shown in FIG. Then, the installation directions of the speakers 2303a to 2303e in FIG.
A comparison is performed by associating the two pieces of direction information 2202a to 2202e with each other, and the spatial information 2101a to 2101e in FIG. 21 is selected. As a result, as spatial information corresponding to the speaker 2303c, FIG.
Is obtained. This result is information at the simulation point and may be different from the speaker vibration surface position. In this case, as shown in FIG. 25, the distance r between the simulation point 2502 and the vibration surface of the speaker 2503 is obtained, and the delay T is corrected from the time information in FIG. FIG. 26 shows the result of the delay correction, and this spatial information is incorporated into the filter characteristics of the signal processing means of the sound field control means corresponding to the speaker 2503 shown in FIG. The same processing is performed for other constituent speakers.

By doing so, it becomes possible to output a voice control signal from a speaker corresponding to the direction of the sound field control data, and thus more realistic and precise control becomes possible.

As another creation method, simulation points may be set directly on or near the vibration surface of each speaker shown in FIG. 23, and sound field control data may be obtained for each simulation point. In this case, there is no need to perform the delay correction described above. Further, the obtained spatial information may be further subjected to data processing / editing processing shown in FIGS. 14 and 15 for establishing sound image localization.

(Second Embodiment) In the second embodiment,
Different configurations of the sound field control means will be described.

This sound field control means, as shown in FIG.
Localization adjustment means comprising a delay circuit and a signal level adjustment circuit
402 and a signal processing means 403 comprising an FIR filter and a signal level adjuster are connected in series. In this case, unlike the sound field control means 300 of FIG.
02 and the mixing means 305 are unnecessary, and the configuration can be simplified.

When the audio signal for localizing the sound image is delayed by the localization adjusting means 402, the delayed audio signal is input to the signal processing means 403 of the sound field control means 400. Therefore, it is necessary to take in the sound field control data into the FIR filter of the signal processing unit 403 in consideration of the delay amount.

A method of creating the sound field control data in this case will be described.

The model shown in FIG. 6 is created as a simulation model for the indoor facility shown in FIG.
And the echo time pattern is obtained as shown in FIG. Here, information necessary for creating spatial data is selected and deleted. When it is expected that the passing route of 803a is acoustically ineffective among the passing route information 803a to 803c of FIG. 8, the echo time pattern corresponds to this passing route 803a in the time-series information of FIG. Delete 901a. The result is shown in FIG. Subsequently, time-series adjustment of this data is performed. The delay time in the localization adjusting means 402 in FIG.
When 1 is set, the entire data is temporally shifted forward by T1 in order to measure time-series matching of spatial data. The result is shown in FIG.

By performing this shift,
If the time information becomes negative, the data is deleted. And finally, in order to reflect the localization loudspeaker data by the localization adjusting means 402 in FIG.
Data is added to the data of FIG. The time information of the data to be added is 0, and the size information is adjusted to a value that does not give a sense of incongruity. The result is shown in FIG. This is incorporated in the FIR filter of the signal processing means 403 in FIG.

In the case where there is acoustically adverse data in the acoustic characteristic data and it is necessary to cancel the data of the acoustic wave path which adversely affects the acoustic characteristic, the same as in the first embodiment, Next, the impulse response (FIG. 9) is processed to delete the pulse of 901a corresponding to the passage 803a, thereby creating an impulse response as shown in FIG. Then, an anti-phase function (FIG. 30) of the impulse response (FIG. 9) is obtained, and the anti-phase function (FIG. 30)
And a function (FIG. 10) obtained by excluding a portion that adversely affects acoustics from the constituent pulses of the impulse response.

Next, as shown in FIG. 11, a correction process for the delay time T1 set in the localization adjusting means 402 in FIG.
Further, as shown in FIG. 12, data of time information 0 is added to the result. The data in FIG. 12 is incorporated into the filter characteristics of the signal processing unit 403 in FIG. By doing so, it is possible to cancel or augment the sound effect by canceling out the sound data of the sound wave path that adversely affects the sound.

A method of processing and editing sound field control data so that sound image localization is established will be described.

It is assumed that data as shown in FIG. 16 is obtained as sound field control data by the above-described method. First,
Edit the time information of this data. First 16 of time information
01a is not edited, and all the second and subsequent time information (1601b to 1601d) are relatively shifted by the time T1. The shift amount T1 at this time is given by T1 = (second time information 1601b) − (first time information 1601a) − (safety amount T2). The safety amount T2 may be set to any value, but the smaller the value of T2 is, the more data that can enhance the loudspeaker effect can be created. The result of shifting by T1 is shown in FIG.

The result is adjusted to the magnitude (pulse level) by fitting the psychological straight line in FIG. 13 as in FIG. The result of this adjustment is shown in FIG. Psychological straight line
The size information is adjusted to match 1801, and the data created in this way is reflected as the filter characteristics of the signal processing unit 403 in FIG.

Next, sound field control data in the case where a plurality of speakers are intensively arranged to control a sound field in a room will be described.

It is assumed that the control speakers corresponding to the simulation points are arranged as shown in FIG. 23, the directional information 2101a to 2101e of the simulation points are as shown in FIG. 22, and the spatial information is obtained as shown in FIG. .

Here, the information 2701a to 2701e in FIG.
2 corresponding to the two direction information 2202a to 2202e. Also, there is no direction information corresponding to the information 2701f in the time information 0 in FIG.

The correspondence between the installation directions of the speakers 2303a to 2303e in FIG. 23 and the direction information 2202a to 2202e in FIG. 22 is compared and examined, and the spatial information 2701a to 2701e in FIG. . In addition, the spatial information 2701f is reflected in all the selected results. as a result,
It is assumed that FIG. 28 is obtained as spatial information corresponding to the speaker 2303c. The information 2801 in FIG. 28 is the information 2701 in FIG.
28. The information 2802 in FIG. 28 is selected from the information in FIG.

The result is information at the simulation point, and may be different from each speaker vibration surface position. In this case, as shown in FIG.
The distance r between the 02 and the vibration surface of the speaker 2503 is obtained, and the delay is corrected from the time information in FIG. FIG. 29 shows the result of the delay correction, and this spatial information is incorporated into the FIR filter characteristic of the signal processing means of the sound field control means corresponding to the speaker shown in FIG. The same processing is performed for other constituent speakers.

As a result, a control signal can be output from a speaker corresponding to the direction of the sound field control data.
Therefore, more realistic and precise control becomes possible.

As another method, simulation points may be directly set on or near the vibration surface of each speaker shown in FIG. 23, and sound field control data may be obtained for each simulation point. In this case, there is no need to perform the delay correction described above. Further, the obtained spatial information may be further subjected to data processing / editing processing shown in FIGS. 17 and 18 for establishing sound image localization.

[0093]

As is clear from the above description, the sound field control device of the present invention can be modified or optimized to optimize the sound effect according to the position of each sound source, the position of each output speaker, and the indoor shape. The sound effect can be enhanced, and the sense of volume that achieves sound image localization can be improved at the same time.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a sound field control device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a sound field control unit according to the embodiment of the present invention;

FIG. 3 is a block diagram showing a detailed structure of a sound field control unit according to the first embodiment of the present invention;

FIG. 4 is a block diagram showing a detailed structure of a sound field control unit according to a second embodiment of the present invention;

FIG. 5 is a sound source and speaker arrangement diagram for creating sound field control data according to the embodiment of the present invention;

FIG. 6 is a virtual wall layout diagram for creating sound field control data according to the embodiment of the present invention;

FIG. 7 is an explanatory diagram of a virtual image method simulation according to the embodiment of the present invention;

FIG. 8 is an explanatory diagram of a sound wave passage path for creating sound field control data according to the embodiment of the present invention;

FIG. 9 is an explanatory diagram of an echo time pattern for creating sound field control data in the embodiment of the present invention;

FIG. 10 is an explanatory diagram of echo time pattern editing for creating sound field control data according to the first embodiment of the present invention;

FIG. 11 is an explanatory diagram of echo time pattern editing (time-series adjustment) for creating sound field control data according to the second embodiment of the present invention;

FIG. 12 is an explanatory diagram of echo time pattern editing (data addition of time information 0) for creating sound field control data according to the second embodiment of the present invention;

FIG. 13 is an explanatory diagram of a psychological linear function for creating sound field control data according to the embodiment of the present invention;

FIG. 14 is an explanatory diagram of echo time pattern editing for creating sound field control data according to the first embodiment of the present invention;

FIG. 15 is an explanatory diagram of echo time pattern editing (pulse level correction) for creating sound field control data according to the first embodiment of the present invention;

FIG. 16 is an explanatory diagram of an echo time pattern for creating sound field control data according to the second embodiment of the present invention;

FIG. 17 is an explanatory diagram of echo time pattern editing (time-series adjustment) for creating sound field control data according to the second embodiment of the present invention;

FIG. 18 is an explanatory diagram of echo time pattern editing (pulse level correction) for creating sound field control data according to the second embodiment of the present invention;

FIG. 19 is a configuration diagram of a sound field control speaker according to the embodiment of the present invention;

FIG. 20 is an output system diagram of a sound field control speaker according to the embodiment of the present invention;

FIG. 21 is an explanatory diagram of an echo time pattern for creating sound field control data according to the first embodiment of the present invention;

FIG. 22 is an explanatory diagram of a sound wave passing direction for creating sound field control data according to the embodiment of the present invention;

FIG. 23 is an explanatory diagram of a speaker positional relationship for creating sound field control data according to the embodiment of the present invention;

FIG. 24 is an explanatory diagram of sound field control data for creating sound field control data according to the first embodiment of the present invention;

FIG. 25 is an explanatory diagram of a speaker positional relationship for creating sound field control data according to the embodiment of the present invention;

FIG. 26 is a diagram for explaining sound field control data editing (delay correction) for creating sound field control data according to the first embodiment of the present invention;

FIG. 27 is an explanatory diagram of an echo time pattern for creating sound field control data according to the second embodiment of the present invention;

FIG. 28 is an explanatory diagram of sound field control data for creating sound field control data according to the second embodiment of the present invention;

FIG. 29 is a diagram for explaining sound field control data editing (delay correction) for creating sound field control data according to the second embodiment of the present invention;

FIG. 30 is an explanatory diagram of sound field control data editing (inverse phase function) for creating sound field control data in the embodiment of the present invention.

[Explanation of symbols]

101, 501, 601 Stage 102, 502, 603, 701, 801 Sound source 103 CD sound source 104, 202, 300, 400 Sound field control means 105 Amplification means 106, 503, 604, 1902, 2001, 2303, 2503 Speakers 201, 301 , 401 input 203, 306, 404 output 302 signal branching means 303, 402 localization adjustment means 304, 403 signal processing means 305 signal mixing means 602 stage reflector 605, 703, 802, 2202, 2302, 2502 simulation point 700 simulation room 702, 1901, 2201, 2301, 2501 Wall 704 Reflection point 803 Route information 804 Direction information 1304, 1401, 1501, 1801 Psychological line

Claims (12)

[Claims] 1. A sound field in an indoor space such as a theater, a hall, a public hall, a broadcasting studio, a recording studio, and the like, in which sound from one or a plurality of sound sources such as speakers, performers, and musical instruments is emitted through an electric loudspeaker system. A sound field control device for controlling the number of input systems from a sound collection unit that collects the sound of the sound source; And N × M sound field control means corresponding to one combination of each of the output systems, and each of the sound field control means simulates the indoor space or assumes a virtual wall surface in the indoor space. Generating an output of the speaker by reflecting sound field control data obtained by performing arbitrary editing on the acoustic characteristic data obtained from the simulation performed or the actual measurement of the indoor space; Sound field controller for causing electrically changing or enhancing the architectural acoustics space. 2. A sound image localization adjusting device comprising a delay circuit and a signal level adjusting circuit, wherein:
A signal processing device comprising an R filter and a signal level adjustment circuit, wherein the output of the speaker is generated by reflecting the sound field control data on a filter characteristic of the FIR filter. 2. The sound field control device according to claim 1. 3. The sound field control device according to claim 2, wherein the sound image localization adjustment device and the signal processing device are connected in parallel. 4. The sound field control device according to claim 2, wherein the sound image localization adjustment device and the signal processing device are connected in series. 5. A pulse time and a pulse level of an impulse response or an echo time pattern of the indoor space are obtained by the simulation or the actual measurement,
4. The sound field control device according to claim 3, wherein the sound field control data obtained by editing the pulse level is reflected on filter characteristics of the FIR filter. 6. A pulse time and a pulse level of an impulse response or an echo time pattern of the indoor space are obtained by the simulation or the actual measurement,
The sound field control device according to claim 4, wherein the sound field control data obtained by editing the time series of the pulse level and the pulse time is reflected on the filter characteristics of the FIR filter. 7. The sound field control device according to claim 5, wherein the pulse level is edited so as to be in accordance with psychological data regarding sound image localization obtained in a psychoacoustic experiment. 8. The sound field according to claim 6, wherein the pulse level after editing the time series of the pulse time is edited in accordance with psychological data relating to sound image localization obtained in a psychoacoustic experiment. Control device. 9. A plurality of loudspeakers are centrally arranged as the loudspeakers, and the sound field control means is connected to each of the loudspeakers, and each of the sound field control means corresponds to a sound output direction of each loudspeaker. The sound field control data obtained by the FIR
3. The sound field control device according to claim 2, wherein the sound field control device reflects the filter characteristic of the filter. 10. The sound output direction data corresponding to each speaker is classified by comparing the sound output direction data obtained by the simulation or the actual measurement with the sound output direction of each speaker, and from the classified sound output direction data. 10. The sound field control device according to claim 9, wherein the edited sound field control data is incorporated in a filter characteristic of an FIR filter of the sound field control means connected to a corresponding speaker. 11. An impulse response of the indoor space is obtained by the simulation or the actual measurement, and an anti-phase function of the impulse response is superimposed on a function from the impulse response in which a pulse component that causes a deterioration in sound effect is deleted. 4. The sound field control device according to claim 3, wherein the calculated function is reflected on the filter characteristics of the FIR filter as the sound field control data. 5. 12. An impulse response of the indoor space is obtained by the simulation or the actual measurement, and an anti-phase function of the impulse response is superimposed on a function obtained by removing a pulse component that causes a deterioration of an acoustic effect from the impulse response. 5. The sound field control device according to claim 4, wherein a function obtained by performing a calculation and performing a time series adjustment thereon is reflected on the filter characteristics of the FIR filter as the sound field control data.