JP2009100360A - Sound image localization parameter calculating device, sound image localization control device, sound image localization device, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide technology for reducing the working load of a worker to set sound image localization during similar sound image localization in a plurality of different facilities. <P>SOLUTION: In a reference impulse response data storage region 421 of a computer device 40, data is stored which is measured at a predetermined listening position in a reference facility and which shows the impulse response of each speaker 20-j. In a reference parameter storage region 422, a reference level value and a reference delay time value are stored for localizing sound image which is released from each speaker 20-j in the reference facility. When the impulse response is measured at the listening position in a facility different from the reference facility, a control part 41 calculates a difference between the reference impulse response and the measured impulse response, and calculates a level parameter value and a delay time parameter value to eliminate the difference between the localization position of the sound image in the reference facility and the localization position of the sound image in the facility. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for localizing a sound image.

In facilities such as theaters and halls, in order to supplement the volume of performers' voices and singing voices on the stage, a method of expanding the voices and singing voices of speakers using speakers is proposed. In such cases, the sound of the performer is picked up by the microphone, and the picked-up sound is localized at each performer's position using a plurality of speakers to make the listener aware of the presence of the speaker. Some of them supplement the voices of the performers. In this way, when performing the sound image localization of the performer's voice, not only the speaker volume level but also the delay time of the audio signal supplied to each speaker is adjusted to localize the sound image using the Haas effect. Some have. Non-Patent Document 1 and Non-Patent Document 2 propose an apparatus for simulating sound in a facility using such stage sound. In Patent Document 1, in the sound field control device for adjusting the characteristics of the sound field, the delay amount of the acoustic signal and the set value of the output level are displayed in an easy-to-understand manner, and these parameters are displayed. Techniques for improving the efficiency of setting work have been proposed.
“Http://www.outboard.co.uk/pages/timaxsoftware.htm” “Http://www.meyersound.com/products/lcs_series/matrix3/surround_panning.htm” JP 2004-333592 A

  By the way, there are cases where the same performance is performed in a plurality of different facilities in theaters and operas. In this case, the voice of the performer needs to be localized at the same position in the same performance. However, since the size of the facility, the installation position of the speaker, the positional relationship between the performer and the listening position, etc. are different in each facility, conventionally, the sound image is localized according to the size of the facility and the installation position of the speaker. It was necessary to adjust the acoustic characteristics according to each facility. Such adjustment of the acoustic characteristics requires an operator such as a stage director to design manually for each facility, and there are large factors depending on the experience and ability of the operator. In addition, it is necessary to design acoustic characteristics as many as the number of facilities, and the work is particularly complicated when the number of venues is large. In the technique described in Patent Document 1, although it is easy for the operator to intuitively grasp the delay value of the acoustic signal and the set value of the output level, it is necessary for the operator to manually design, and the work is complicated. there were.

  The present invention has been made in view of the above-described circumstances, and provides a technique capable of reducing the workload of an operator related to sound image localization setting when performing similar sound image localization in a plurality of different facilities. With the goal.

  A sound image localization parameter calculation apparatus that is a preferred aspect of the present invention for solving the above-described problem is to localize a sound image of sound emitted from the sound emission means in a reference space at a predetermined position. A reference value storage means for storing a reference level adjustment value for adjusting the level of the audio signal supplied to the sound emitting means and a reference delay time adjustment value for adjusting the delay time of the audio signal; and Reference acoustic characteristic data storage means for storing reference acoustic characteristic data indicating the acoustic characteristics of the sound emitted from the sound emitting means in the space, and the acoustic characteristics of the sound emitted from the sound emitting means in the target space Acquired by the acoustic characteristic acquisition means, the acoustic characteristics indicated by the reference acoustic characteristic data stored in the reference acoustic characteristic data storage means, and the acoustic characteristic acquisition means A difference calculation means for calculating a difference from the reverberation characteristic; a sound image in the reference space from a reference level value and a reference delay time value stored in the reference value storage means and the difference calculated by the difference calculation means; A level adjustment value for adjusting the level of the audio signal supplied to the sound emitting means in the target space, so that the difference between the localization position of the target sound and the localization position of the sound image in the target space decreases Parameter value calculating means for calculating a delay time adjustment value for adjusting the delay time of the audio signal.

  A sound image localization control device according to a preferred embodiment of the present invention includes a sound image localization parameter calculation device described above and a level adjustment unit that adjusts the level of the audio signal using the level adjustment value calculated by the parameter value calculation unit. And a parameter supplying means for supplying the delay time value calculated by the parameter value calculating means to a delay time adjusting means for adjusting the delay time of the audio signal.

  In the above aspect, parameter storage means for storing a plurality of level adjustment values and delay time adjustment values calculated by the parameter value calculation means for each target space, and designation means for specifying the target space And the parameter supply means reads the level adjustment value and the delay time adjustment value corresponding to the space designated by the designation means from the parameter storage means, and supplies the read level adjustment value to the level adjustment means. At the same time, the read delay time adjustment value may be supplied to the delay time adjustment means.

  A sound image localization apparatus according to a preferred aspect of the present invention includes a level adjustment that adjusts the level of an audio signal output from the sound image localization control apparatus and the sound collection means according to the parameter supplied by the parameter supply means. Means, a delay time adjusting means for adjusting a delay time of the audio signal output from the sound collecting means according to a parameter supplied by the parameter supplying means, a level is adjusted by the level adjusting means, and the delay time adjustment is adjusted Output means for supplying an audio signal whose delay time is adjusted by the means to the sound emitting means.

  In the above-described aspect, an equalizer unit that adjusts a frequency characteristic of an audio signal that is adjusted by the level adjusting unit and adjusted by the delay time adjusting unit may be provided.

  According to the present invention, when similar sound image localization is performed in a plurality of different facilities, it is possible to reduce the work load of an operator related to sound image localization setting.

Embodiments of the present invention will be described below with reference to the drawings.
<A: Configuration>
FIG. 1 is a block diagram showing a configuration of a sound image localization system according to an embodiment of the present invention. This sound image localization system is a system for localizing sound images of performers' voices, singing voices and instrument sounds (hereinafter simply referred to as “voices”) in facilities such as theaters and halls. This sound image localization system adjusts the level and delay time of m microphones 10-k (1 ≦ k ≦ m) that pick up the voices of performers on the stage and each audio signal generated in each microphone 10-k. A sound image localization device 30 that supplies the audio signals after mixing to the n speakers 20-j (1 ≦ j ≦ n), and n pieces of sound that are emitted according to the supplied audio signals. The speaker 20-j, a computer device 40 that supplies various parameters related to sound image localization to the sound image localization device 30, and a microphone 50 for measuring acoustic characteristics (delay time and attenuation level) at the listening position. .

  Each of the microphones 10-k is a sound collection unit that collects a voice of a performer or a singing voice on the stage. Each of the microphones 10-k is provided at a plurality of different positions on the stage such as for each performer, collects sound at each position, and outputs an audio signal representing the collected sound. Each of the speakers 20-j is a sound emitting unit that emits sound at a level corresponding to the supplied audio signal. The speaker 20-j is provided on the stage or in the vicinity of the stage, and plays a role of supplementing the volume of the performer's voice or singing voice on the stage.

  The sound image localization apparatus 30 includes m input units 31-k (1 ≦ k ≦ m). The input unit 31-k is provided corresponding to each of the m microphones 10-k, and receives an audio signal output from the microphone 10-k. The sound image localization control unit 32 has a function of adjusting the level of each input audio signal and a function of adjusting a delay time. The sound image localization control unit 32 controls the input unit 31-k according to a parameter supplied from the computer device 40. Adjusts the sound pressure level and delay of the input audio signal. The sound image localization control unit 32 mixes the adjusted audio signal and outputs the mixed audio signal to the output unit 33-j (1 ≦ j ≦ n). The n output units 33-j are connected to the n speakers 20-j, respectively, and supply the audio signals supplied from the sound image localization control unit 32 to the speakers 20-j.

  Next, the details of the configuration of the sound image localization control unit 32 of the sound image localization device 30 will be described with reference to FIG. FIG. 2 is a block diagram illustrating an example of the configuration of the sound image localization control unit 32. In the figure, each of the level adjusters 321-k-j (1 ≦ k ≦ m, 1 ≦ j ≦ n) adjusts the level of the audio signal according to the parameters supplied from the computer device 40. Further, each of the delay adjustment units 322-k-j (1 ≦ k ≦ m, 1 ≦ j ≦ n) adjusts the delay time of the audio signal according to the parameter supplied from the computer device 40. The mixing unit 323-j (1 ≦ j ≦ n) mixes each audio signal output from the delay adjustment unit 322-k-j. The amplifier 324-j (1 ≦ j ≦ n) amplifies the audio signal output from the mixing unit 323-j and outputs the amplified audio signal to the output unit 33-j. The audio signal output to the output unit 33-j is output to the speaker 20-j. At this time, the various parameters supplied from the computer device 40 are set in advance so that the sound image of the sound emitted from each speaker 20-j is localized at a predetermined position. Sound images are localized at each performer's position and emitted.

The computer device 40 is a device that supplies parameters for level adjustment and delay time adjustment to the sound image localization device 30, and is a personal computer, for example. The computer device 40 is communicably connected to the sound image localization device 30. FIG. 3 is a block diagram illustrating an example of the configuration of the computer device 40. In the figure, a control unit 41 includes a CPU (Central Processing Unit) and a ROM (Read Only Memory), reads out and executes a computer program stored in the ROM or the storage unit 42, and thereby executes a computer device via a bus. 40 units are controlled. The storage unit 42 is a storage unit for storing a computer program executed by the control unit 41 and data used at the time of execution, and is, for example, a hard disk device. The display unit 43 is a display unit that includes a liquid crystal panel and displays various images under the control of the control unit 41. The operation unit 44 includes, for example, a keyboard and a mouse, and outputs a signal corresponding to an operation by an operator of the computer device 40 to the control unit 41. In this embodiment, the case where the display unit 43 and the operation unit 44 are included in the computer device 40 will be described. However, the display unit 43 and the operation unit 44 may be externally attached to the computer device 40. Good. The communication unit 45 exchanges data with the sound image localization device 30.
In this embodiment, an example in which the computer device 40 and the sound image localization device 30 are configured separately will be described. However, the computer device 40 may be built in the sound image localization device 30.

  The storage unit 42 of the computer device 40 includes a reference impulse response data storage area 421, a reference parameter storage area 422, and a facility-specific parameter storage area 423, as shown in the figure. In the reference impulse response data storage area 421, the operator selects each speaker 20-j at a desired position in the reference facility at the facility (hereinafter referred to as “reference facility”) selected by the operator as a facility that is a reference for sound image localization. The reference impulse response data indicating the impulse response (hereinafter referred to as “reference impulse response”) measured at a predetermined listening position in the reference facility in a state where various parameters are set to desired states is provided for each speaker. Stored every 20-j. FIG. 4 is a diagram showing an example of the arrangement of the speakers 20-j in a certain reference facility X, and FIG. 5 is a diagram showing an example of the contents of reference impulse response data. In the example shown in FIG. 4, three speakers, speakers 20-A, 20-B, and 20-C, are arranged in the reference facility X, and the voice of the performer is heard at the listening position S. Yes. FIG. 5 shows impulse responses of the speakers 20-A, 20-B, and 20-C at the listening position S in the speaker arrangement state illustrated in FIG.

  Next, in the reference parameter storage area 422 of the storage unit 42, each parameter value (hereinafter referred to as “reference value”) used when the sound image localization apparatus 30 localizes the sound image in the reference facility is stored. FIG. 6 is a diagram illustrating an example of the reference value stored in the reference parameter storage area 422. As shown in the figure, the storage area stores a reference value of a level parameter for adjusting the level of the audio signal and each reference value of a delay parameter for adjusting the delay time of the audio signal. In the example shown in FIG. 6, the reference values of the level parameters supplied to each of the level adjustment units 321-k-j (1 ≦ k ≦ m, 1 ≦ j ≦ n) are stored in a matrix and are delayed. Reference values of delay time parameters supplied to each of the time adjustment units 322-k-j (1 ≦ k ≦ m, 1 ≦ j ≦ n) are stored in a matrix. Each of these reference values is manually set to localize the sound image in a manner desired by the operator at the reference facility.

  Next, in the parameter storage area 423 for each facility, each value of a parameter used when the sound image localization apparatus 30 performs sound image localization in each facility (hereinafter referred to as “target facility”) that is a target for reproducing the sound image localization of the reference facility. Is stored for each facility. FIG. 7 is a diagram illustrating an example of each value of the parameter stored in the parameter storage area 423 for each facility. As shown in the figure, the storage area stores a level parameter and a delay parameter for each facility. The control unit 41 of the computer device 40 calculates the parameter value for each facility based on the parameter reference value and the difference in impulse response between the reference facility and each facility.

<B: Operation>
Next, the operation of this embodiment will be described.
<B-1: Reference impulse response data registration operation>
First, reference impulse response data registration operation will be described. Operators such as stage directors manually place the speakers at the desired location in the reference facility, adjust the level and delay time for each speaker, and adjust the sound localization using the Haas effect etc. Do. When the position, level adjustment, and delay time adjustment of each speaker are determined, the operator stores the reference value of the level parameter for adjusting the level and the reference value of the delay parameter for adjusting the delay time. Store in area 422. As a result, the reference parameter storage area 422 stores the reference value of the level parameter and the reference value of the delay parameter for localizing the sound image at a desired position in the reference facility. The level adjustment unit 321-k-j and the delay adjustment unit 322-k-j are supplied with the reference value stored in the reference parameter storage area 422, and the level adjustment according to the parameter supplied at the level 321-k-j And the delay time adjustment according to the parameters supplied by the delay adjustment unit 322-k-j is performed, so that the sound image localized in the manner desired by the operator is emitted from the speaker 20-j. Sounded.

  Next, the worker installs the microphone 50 at a predetermined listening position in the reference facility, and measures the delay time and attenuation level depending on the distance between each speaker and the sound receiving point for each speaker 20-j. The operation is performed using the operation unit 44 of the computer device 40. In this embodiment, in order to measure the delay time and the attenuation level depending on the distance between each speaker and the sound receiving point, the impulse response for each speaker 20-j is measured, but not only the impulse response is measured. Any other method may be used as long as it measures the delay time and the attenuation level depending on the distance between the speaker and the sound receiving point. The operation unit 44 outputs a signal corresponding to the operated content to the control unit 41, and the control unit 41 outputs a signal indicating that the impulse response is measured according to the signal supplied from the operation unit 44. Output to 30. The sound image localization device 30 supplies an audio signal indicating a pulse sound to each speaker for measuring an impulse response based on a signal from the computer device 40. Thereby, a pulse sound is emitted from each speaker 20-j.

  The pulse sound emitted from each speaker 20-j is collected by the microphone 50, converted into an audio signal, and output to the computer device 40. The control unit 41 of the computer device 40 uses the data indicating the impulse response (illustrated in FIG. 5) for each speaker 20-j obtained by analyzing the audio signal supplied from the microphone 50 as reference impulse response data. The response data is stored in the response data storage area 421.

<B-2: Parameter value calculation operation for each facility>
Next, the parameter calculation operation for each facility will be described. When a sound image is localized in a facility different from the reference facility where the reference impulse response data is measured, first, the worker places the speaker 20-j that can be used in the facility at a position where it can be installed.

  FIG. 8 is a diagram illustrating an example of the arrangement of speakers installed in a facility Y different from the reference facility X. In the example shown in FIG. 8, in the facility Y, the speaker 20-b is installed instead of the speaker 20-B shown in FIG. 4, and the speaker 20-C is used instead of the speaker 20-C shown in FIG. c is installed. First, an operator such as a stage director places the speaker 20-j at a desired position in the facility Y. When the speaker is arranged at a desired position, the operator installs the microphone 50 at the listening position S in the facility and performs an operation for measuring the impulse response using the operation unit 44 of the computer device 40. The operation unit 44 outputs a signal corresponding to the operated content to the control unit 41, and the control unit 41 causes the sound image localization device 30 to emit a pulse sound according to the signal supplied from the operation unit 44. Output a signal. The sound image localization device 30 emits a pulse sound from the speaker 20-j based on a signal from the computer device 40.

  The control unit 41 of the computer device 40 measures the impulse response for each speaker 20-j by the audio signal supplied from the microphone 50, and generates impulse response data indicating the measured impulse responses of the plurality of speakers 20-j. To do. FIG. 9 is a diagram illustrating an example of impulse responses of the speakers 20-A, 20-b, and 20-c measured in the facility Y illustrated in FIG.

  Next, the control unit 41 calculates a difference between the reference impulse response stored in the reference impulse response data storage area 421 and the impulse response measured for each target facility (hereinafter referred to as “target impulse response”). Next, the control unit 41 seems to reduce the difference between the localization position of the sound image at the listening position of the reference facility and the localization position of the sound image at the measurement facility from the reference value stored in the reference parameter storage area 422 and the calculated difference. In addition, a level parameter value for adjusting the level of the audio signal supplied to the speaker 20-j and a delay parameter value for adjusting the delay time are calculated in the measurement facility. This parameter value calculation process will be described with reference to the drawings.

  First, the control unit 41 compares the number of speakers used in the reference facility (hereinafter referred to as “reference speaker”) with the number of speakers used in the measured facility (hereinafter referred to as “target speaker”). When the numbers match, the control unit 41 associates the reference speaker with the target speaker on a one-to-one basis. For example, one-to-one correspondence may be made so that the difference in delay time is minimized. 5 and 9, the reference speaker 20-B and the target speaker 20-b are associated with each other, and the reference speaker 20-C and the target speaker 20-c are associated with each other. Next, the control unit 41 determines the value of the level parameter for each facility so that the level is adjusted by the difference between the level of the target impulse response and the level of the reference impulse response, and the delay time of the target impulse response and the reference The value of the delay time parameter for each facility is determined so that the delay time is adjusted by the difference from the delay time of the impulse response. Specifically, for example, when the reference impulse response is as shown in FIG. 5 and the target impulse response is as shown in FIG. 9, the control unit 41 selects the target speaker 20-as shown in FIG. 9. The parameter is determined (corrected) so that the level of b is increased by ΔL1, and the parameter value is determined (corrected) so that the delay time of the target speaker 20-b is decreased by Δt1. In this way, each parameter is corrected to approximate the delay time and level of the target speaker to the delay time and level of the reference speaker.

  For example, when the stage of the target facility Y is narrower than the reference facility X and the speakers 20-B and 20-C cannot be installed, the speakers 20-b and 20-c different from the speakers 20-B and 20-C are used. May be installed. In such a case, since the volume levels of the speakers 20-B and 20-C and the volume levels of the speakers 20-b and 20-c are different, it is assumed that the same level setting and delay setting as the reference facility X are performed. However, it is not possible to obtain the same acoustic effect as that of the reference facility X (sound image localization at a desired position).

  On the other hand, in this embodiment, even if the shape of the facility and the usable speakers are different for each facility, the parameters for obtaining the same acoustic effect (sound image localization) as the other facilities in each facility. Each value can be automatically calculated by the sound image localization apparatus.

  Next, parameter value calculation processing when the number of speakers 20-j is different between the reference facility and the target facility will be described with reference to the drawings. FIG. 10 is a diagram illustrating an example of speaker arrangement when the number of speakers to be installed is larger than that of the reference facility X, and FIG. 11 is a diagram illustrating an example of an impulse response measured in the case illustrated in FIG. It is. FIG. 12 is a diagram illustrating an example of speaker arrangement when the number of speakers to be installed is smaller than that of the reference facility X, and FIG. 13 is an example of an impulse response measured in the case illustrated in FIG. FIG. As illustrated in FIG. 10 and FIG. 12, when the number of speakers is different from the reference facility, the control unit 41 associates a reference speaker having a delay time difference within a predetermined range for each target speaker. (See FIGS. 11 and 13). Note that the association method is not limited to this, and for example, a reference speaker that minimizes the difference in delay time may be associated with the target speaker. At this time, as shown in FIG. 10 and FIG. 12, there are cases where the target speaker and the reference speaker do not correspond one-to-one. In this case, the control unit 41 determines the values of the level parameter and the delay parameter by performing the same processing as described above for the speakers corresponding one-to-one.

On the other hand, for speakers that do not correspond one-to-one, the control unit 41 determines each parameter value as follows. First, when a plurality of target speakers are associated with one reference speaker (for example, see FIG. 10), the control unit 41 sets the sum of the levels of the plurality of speakers to the level of the reference speaker. In addition, the value of the level parameter is determined, and the value of the delay parameter is determined so that each delay time of the plurality of speakers becomes the delay time of the reference speaker. Specifically, the sum of the levels of the target speakers 20-c ′ and 20-c ″ is set to the level of the corresponding reference speaker 20-C, and each time the target speakers 20-c ′ and 20-c ″ are delayed. The interval is set to the delay time of the corresponding reference speaker 20-C.

When a plurality of reference speakers are associated with one target speaker (see, for example, FIG. 12), the control unit 41 sets the sum of the levels of the plurality of reference speakers to the level of the target speaker. As described above, each value of the level parameter is determined, and the value of the delay parameter is determined so that the delay time of the target speaker becomes the average value of the delay times of the plurality of reference speakers. Specifically, the sum of the levels of the reference speakers 20-B and 20-C is set to the level of the target speaker 20-c, and the delay time of the target speaker 20-c is set to the reference speakers 20-B and 20-C. The average value of the delay time of Alternatively, after creating a plurality of responses by superimposing a plurality of delay times on the response of the target speaker, the parameters may be set so as to approximate each response to the corresponding reference speaker.
As described above, the control unit 41 calculates the values of the level parameter and the delay parameter for each facility, and stores the calculated parameter values in the facility-specific parameter storage area 423 for each facility.

<B-3: Sound image localization operation>
Next, the operation of localizing the sound image of the sound emitted from the speaker 20-j using the calculated parameters will be described. First, the operator performs an operation of designating any one of the parameters stored in the parameter storage area 423 for each facility, that is, any one of a plurality of facilities. The operation unit 44 outputs an operation signal corresponding to the operated content to the control unit 41, and the control unit 41, based on the signal from the operation unit 44, out of the parameters stored in the parameter storage area 423 for each facility. Choose one. The control unit 41 reads the selected level parameter and delay parameter from the per-facility parameter storage area 423, supplies the read level parameter to the level adjustment unit 321-k-j, and supplies the read delay time parameter to the delay adjustment unit 322. -K-j.

  The sound image localization device 30 performs level adjustment and delay time adjustment for each of the audio signals supplied from the microphone 10-k based on the parameters supplied from the computer device 40. That is, the level adjustment unit 321-k-j adjusts the level of the audio signal input to the input unit 31-k based on the level parameter supplied from the computer device 40. The delay adjustment unit 322-k-j adjusts the delay time of the audio signal supplied from the level adjustment unit 321-k-j based on the delay parameter supplied from the computer device 40. The audio signal whose level is adjusted by the level adjusting unit 321-k-j and whose delay time is adjusted by the delay adjusting unit 322-k-j is mixed by the mixing unit 323-j and amplified by the amplifier 324-j. Then, it is output to the speaker 20-j via the output unit 33-j. At this time, each parameter supplied from the computer device 40 is calculated so that there is no difference between the localization position of the sound image at the listening position of the reference facility and the localization position of the sound image at the listening position of the actual facility. Thus, at the listening position in the facility, the sound of each performer on the stage is localized at the same position as the reference facility.

By the way, conventionally, it is necessary for an operator to set work such as parameter setting for each facility by trial and error in order to obtain a desired sound effect, and it is necessary to spend time and labor on the work. was there. On the other hand, in this embodiment, the worker only needs to acquire the acoustic characteristics at the listening position in each facility, and the working time for the setting can be shortened as compared with the conventional case.
Further, in this embodiment, the adjustment is performed without relying on the subjective evaluation of the worker's audibility. Therefore, for example, the adjustment result does not differ between an experienced worker and an inexperienced worker, and is different. Even when the worker works, the same acoustic effect can be obtained.

<C: Modification>
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. An example is shown below. In addition, you may combine each following aspect suitably.
(1) In the above-described embodiment, as shown in FIG. 14, an equalizer 325-j (1 ≦ j ≦ n) for adjusting sound quality (frequency characteristics) is connected to each amplifier 324-j (1 ≦ j ≦ n). It is good also as a structure provided in the front | former stage. According to this aspect, for example, even if the frequency characteristic at the sound receiving point changes due to the change in the direction of the speaker 20-j, the frequency is adjusted by the equalizer 325-j mounted inside the sound image localization device 30. The characteristics can be adjusted. The reason is as follows.

  When the reference speaker and the target speaker are on the same line in the same direction as viewed from the listening position, adjustment is performed by the method described in the above embodiment, while the reference speaker and the target speaker are the same in the same direction as viewed from the listening position. If not on the line, the frequency characteristics may be corrected using the equalizer 325-j shown in FIG. Since only the difference in distance can be corrected by adjusting the level and the delay time, if the direction of the speaker is different, the adjustment is made by the following method. First, it is assumed that the reference speaker is facing the listening position (the listening position is on the axis of the speaker). Further, it is assumed that the target speaker does not face the listening position and is displaced by an angle θ from the speaker axis. In this case, a change in the frequency characteristic of the speaker due to the angle θ (a high frequency drop from the axis) is corrected by the equalizer. In other words, the adjustment (correction) on the frequency characteristics according to the difference in orientation of the reference speaker and the target speaker with respect to the sound receiving point may be performed by an equalizer inserted for each target speaker.

  When the number of reference speakers and target speakers is different, the level adjustment range and the delay time adjustment range may be limited so that no coloration or image shift occurs. Specifically, for example, the time difference Δt between adjacent speakers on the time axis in a plurality of target speakers is set to be within about 6 ms so that the adjustment range of the delay time is a range in which no coloration occurs. The time difference Δt may be avoided from about 6 ms to about 20 ms. Further, for example, in order to set an adjustment range in which no image shift occurs, the level difference ΔL is not set to −15 to −10 dB or less at the time difference Δt = 6 to 10 ms, and the level difference ΔL at the time difference Δt = 10 to 20 ms. May be determined by limiting the adjustment value using a table (FIG.) That summarizes the relationship among other sound source types, arrival directions, Δt, and ΔL, such as −20 to −15 dB or less.

Further, the installation position of the equalizer is not limited to FIG. 14. For example, as shown in FIG. 15, an equalizer 326-k−j (1 ≦ k ≦ m, 1 ≦ j ≦ n) for adjusting the frequency characteristics is It is good also as a structure each provided in the back | latter stage of each level adjustment part 321-kj and each delay adjustment part 322-kj.
Further, as shown in FIG. 16, an equalizer 327-j (1 ≦ j ≦ n) for adjusting frequency characteristics is provided in front of each amplifier 324-j, and an equalizer 326-k-j (1 for adjusting frequency characteristics). ≦ k ≦ m, 1 ≦ j ≦ n) may be provided in the subsequent stage of each level adjustment unit 321-k-j and delay adjustment unit 322-k-j.

(2) In the above-described embodiment, the characteristics of the impulse response are measured using the pulse signal. However, the aspect of measuring the acoustic characteristics is not limited to this, and the acoustic characteristics using other signals such as an M-sequence signal, for example. May be measured. In these measurements, it is only necessary to know the level of the direct sound from the speaker and the delay time, so it is not necessary to measure in detail up to the higher-order reflected sound characteristics. Therefore, even when TSP (Time Streched Pulse) is used, the number of taps may be short and the synchronous addition may be performed only once since it is sufficient to obtain a certain SN. There is no need to increase the volume.

(3) In the above-described embodiment, the reference impulse response data and the reference parameter are stored one by one. However, a plurality of sets of the reference impulse response data and the reference parameter may be stored. In this case, a reference facility suitable for the facility is selected according to the facility, and the control unit 41 calculates the parameter value using the reference impulse response data and the reference parameter corresponding to the selected reference facility. do it.
In the above-described embodiment, the case where the sound image is localized in a facility such as a theater or a hall has been described. However, the reference space and the target space are not limited to facilities, and may be outdoor spaces. It may be an indoor room.

(4) The program executed by the control unit 41 of the computer device 40 in the above-described embodiment is recorded on a recording medium such as a magnetic tape, a magnetic disk, a flexible disk, an optical recording medium, a magneto-optical recording medium, RAM, or ROM. Can be provided in state. It is also possible to download to the computer device 40 via a network such as the Internet.

(5) In the above-described embodiment, the acoustic characteristics are actually measured by measuring the impulse response. If the acoustic measurement is performed, accurate data can be acquired in consideration of the influence of the actual installation environment of the speaker (the influence of the speaker installation direction and directivity, the influence of the surrounding building conditions, etc.). On the other hand, the acoustic characteristics (delay time and level) may be calculated in the virtual space without performing actual measurement by acoustic simulation. In this case, there is a case when compared with the measured value accuracy poor, been achieved that the efficiency of the setting operation, it is possible to further reduce the workload of the operator. In addition, the acoustic simulation method facilitates data duplication, editing, management, etc., and improves the convenience of operation. In this case, for example, the control unit 41 may execute predetermined acoustic simulation software or the like to calculate the acoustic characteristics in the virtual space. The characteristic may be calculated, and the control unit 41 may receive data indicating the calculated acoustic characteristic via a communication network or the like. In short, the control unit 41 may acquire the acoustic characteristics of the sound emitted from the speaker in the target space.

It is a block diagram which shows an example of a structure of a sound image localization system. It is a figure which shows an example of a structure of a sound image localization control part. It is a block diagram which shows an example of the hardware constitutions of a computer apparatus. It is a figure which shows an example of the arrangement | positioning aspect of the speaker in a facility. It is a figure which shows an example of the content of the impulse response measured in the listening position of a plant | facility. It is a figure which shows an example of the content of a reference | standard parameter. It is a figure which shows an example of the content of the parameter for every facility. It is a figure which shows an example of the arrangement | positioning aspect of the speaker in a facility. It is a figure which shows an example of the content of the impulse response measured in the listening position of a plant | facility. It is a figure which shows an example of the arrangement | positioning aspect of the speaker in a facility. It is a figure which shows an example of the content of the impulse response measured in the listening position of a plant | facility. It is a figure which shows an example of the arrangement | positioning aspect of the speaker in a facility. It is a figure which shows an example of the content of the impulse response measured in the listening position of a plant | facility. It is a figure which shows an example of a structure of a sound image localization control part. It is a figure which shows an example of a structure of a sound image localization control part. It is a figure which shows an example of a structure of a sound image localization control part.

Explanation of symbols

10-1, 10-2, 10-k, 10-m ... microphone, 20-1, 20-2, 20-j, 20-n ... speaker, 30 ... sound image localization device, 40 ... computer device, 50 ... microphone .

Claims (6)

A reference level adjustment value for adjusting the level of the audio signal supplied to the sound emitting means for localizing the sound image of the sound emitted from the sound emitting means in a reference space to a predetermined position; and Reference value storage means for storing a reference delay time adjustment value for adjusting the delay time of the audio signal;
Reference acoustic characteristic data storage means for storing reference acoustic characteristic data indicating the acoustic characteristics of the sound emitted from the sound emitting means in the reference space;
Acoustic characteristic acquisition means for acquiring the acoustic characteristics of the sound emitted from the sound emission means in the target space;
Difference calculating means for calculating a difference between the acoustic characteristic indicated by the reference acoustic characteristic data stored in the reference acoustic characteristic data storage means and the acoustic characteristic acquired by the acoustic characteristic acquisition means;
Based on the reference level value and the reference delay time value stored in the reference value storage means and the difference calculated by the difference calculation means, the localization position of the sound image in the reference space and the localization of the sound image in the target space A level adjustment value for adjusting the level of the audio signal supplied to the sound emitting means in the target space and a delay time adjustment for adjusting the delay time of the audio signal so that the difference from the position decreases. A sound image localization parameter calculation apparatus comprising: parameter value calculation means for calculating a value. The sound image localization parameter calculation apparatus according to claim 1;
The level adjustment value calculated by the parameter value calculation means is supplied to the level adjustment means for adjusting the level of the audio signal, and the delay time value calculated by the parameter value calculation means is used as the delay time of the audio signal. And a parameter supply means for supplying to the delay time adjusting means for adjusting the sound image localization control apparatus. In the sound image localization control device according to claim 2,
Parameter storage means for storing a plurality of level adjustment values and delay time adjustment values calculated by the parameter value calculation means for each target space;
Specifying means for specifying the target space, and
The parameter supply means reads the level adjustment value and the delay time adjustment value corresponding to the space designated by the designation means from the parameter storage means, supplies the read level adjustment value to the level adjustment means, and reads the level adjustment value. A sound image localization control apparatus, characterized in that a delay time adjustment value is supplied to the delay time adjustment means. The sound image localization control device according to claim 2 or 3,
Level adjustment means for adjusting the level of the audio signal output from the sound collection means according to the parameter supplied by the parameter supply means;
Delay time adjusting means for adjusting the delay time of the audio signal output from the sound collecting means according to the parameter supplied by the parameter supplying means;
A sound image localization apparatus comprising: output means for supplying an audio signal whose level is adjusted by the level adjusting means and whose delay time is adjusted by the delay time adjusting means to the sound emitting means. The sound image localization apparatus according to claim 4,
A sound image localization apparatus comprising: equalizer means for adjusting a frequency characteristic of an audio signal whose level is adjusted by the level adjusting means and whose delay time is adjusted by the delay time adjusting means. A reference level adjustment value for adjusting the level of the audio signal supplied to the sound emitting means for localizing the sound image of the sound emitted from the sound emitting means in a reference space to a predetermined position; and Reference value storage means for storing a reference delay time adjustment value for adjusting the delay time of the audio signal, and reference acoustic characteristic data indicating the acoustic characteristics of the sound emitted from the sound emitting means in the reference space A computer comprising reference acoustic characteristic data storage means for storing,
Acoustic characteristic acquisition means for acquiring the acoustic characteristics of the sound emitted from the sound emission means in the target space;
Difference calculating means for calculating a difference between the acoustic characteristic indicated by the reference acoustic characteristic data stored in the reference acoustic characteristic data storage means and the acoustic characteristic acquired by the acoustic characteristic acquisition means;
Based on the reference level value and the reference delay time value stored in the reference value storage means and the difference calculated by the difference calculation means, the localization position of the sound image in the reference space and the localization of the sound image in the target space A level adjustment value for adjusting the level of the audio signal supplied to the sound emitting means in the target space and a delay time adjustment for adjusting the delay time of the audio signal so that the difference from the position decreases. A program for functioning as parameter value calculation means for calculating a value.

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