JP2001100765A - Instrument for measuring impulse response and method for acoustic field simulation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impulse response characteristics acquisition device, which obtains impulse response characteristics of a speaker system or a speaker to accurately calculate its directional characteristics and phase interference, and acoustic field simulation of loud reproducing which uses this device to obtain high-precision acoustic synthetic characteristics of a speaker. SOLUTION: The direction of a speaker 22 is changed at intervals of a certain angle synchronously with a continuous chirp signal outputted from a signal processor 24, and data of impulse response characteristics of the speaker 22 are acquired by the signal processor 24 in accordance with the output signal of a microphone 23, which collects the continuous chirp signal outputted from the speaker 22, and an input signal inputted to the speaker 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproduction sound field simulation method using a loudspeaker (hereinafter simply referred to as a PA speaker) for a theater, a concert hall or the like.

[0002]

2. Description of the Related Art Conventionally, when performing a reproduction sound field simulation of a PA speaker, a sound pressure level measurement using a pink noise of a speaker to be installed as a sound source is performed, and 1 / 3Oc is measured.
t. Alternatively, 1/1 Oct. Speaker characteristic data is used. As a method for measuring the speaker characteristic data, the following method is conventionally known. In a room such as an anechoic room where there is no echo of sound, place the speaker to be measured on the turntable, fix the microphone at a predetermined distance from the speaker, and rotate the speaker around the horizontal speaker axis. While the pink noise is amplified by the speaker, the sound of the speaker is collected by the microphone at each predetermined angle, and the generated pink noise is collected by the microphone. Each time, the sound pressure level data is measured. In this way, the sound pressure level of each frequency in each angular direction of the speaker is measured, and this data is used as speaker characteristic data in the reproduction sound field simulation of the PA speaker.

[0003]

However, according to the loudspeaker characteristic data measured by the above-described conventional method, when a plurality of loudspeakers are combined and stacked with metal fittings or the like, the loudspeakers are input to speakers for high frequency reproduction or low frequency reproduction. When the network circuit that divides and distributes the reproduction frequency is changed, or when the processor parameters are changed with a multi-amplifier driven multi-way speaker, the peak dip due to phase interference changes significantly, and the sound pressure level data Since only (sound pressure energy data) is measured, phase characteristic information of the loudspeaker itself is lost, so that it is not possible to calculate phase interference when a plurality of loudspeakers are arranged, and it is not possible to calculate a sound field accurately. There was a problem.

Accordingly, the present invention seeks to determine the impulse response characteristics of a speaker system or a multi-way speaker system using a network processor or a speaker in a state in which a plurality of speakers are stacked, thereby obtaining the directional characteristics and phase of the speaker or speaker system. It is an object of the present invention to provide an impulse response characteristic data acquisition device and a sound field simulation method capable of accurately calculating interference and obtaining a high-accuracy overall sound characteristic of a sound field of a speaker.

[0005]

According to the present invention, there is provided an impulse response measuring apparatus comprising: a speaker to which a sound source signal is input and outputting a loudspeaker; a microphone to which the loudspeaker output from the loudspeaker is input; and an output from the microphone. Signal processing means for receiving the input audio signal, processing the sound source signal output to the speaker and the audio signal input from the microphone, speaker rotating means for rotating the speaker in a predetermined direction, the signal processing means, Control means for controlling a speaker rotation means, and the control means rotates the speaker in a predetermined direction in synchronization with the sound source signal output from the signal processing means, and a sound source signal output to the speaker. The signal processing means performs arithmetic processing based on the audio signal input from the microphone, and performs processing of the speaker. And it has a structure in which to obtain the data of the impulse response characteristic. With this configuration, the impulse response characteristics of the speaker can be calculated, and the speaker rotating means is controlled to synchronize with the sound source signal, so that the impulse response characteristic data of the speaker can be obtained automatically and in a short time.

According to the sound field simulation method of the present invention, a speaker to which a sound source signal is inputted and a loud sound is outputted, a microphone to which a loud sound outputted from the speaker is inputted, and a sound signal outputted from the microphone are inputted. Signal processing means for performing signal processing on a sound source signal output to a speaker and an audio signal input from a microphone,
Speaker rotating means for rotating the speaker in a predetermined direction;
An impulse response characteristic data acquisition device comprising: a control unit for controlling the signal processing unit and the speaker rotation unit; and a data arithmetic processing unit for arithmetically processing the impulse response characteristic data acquired by the impulse response characteristic data acquisition device. A speaker arrangement step of arranging a plurality of speakers adjacent to each other to set a center and a speaker axis of the plurality of speakers, a sound field area setting step of setting a sound field area surrounding the plurality of speakers, and the sound field area A sound receiving point setting step of setting a plurality of sound receiving points within a distance, a distance measuring step of measuring a distance from a center of the plurality of speakers to the plurality of sound receiving points, and a center of the plurality of speakers and the plurality of Angle measuring step for measuring the angle between the line connecting the sound receiving points of the speakers and the speaker axes of the plurality of speakers, and the distance measured in the distance measuring step. And impulse response characteristic data of a plurality of loudspeakers corresponding to the measured angles are acquired by the impulse response characteristic data acquisition device, and the impulse response characteristic data is added by a data processing device, and the added specific reception data is obtained. Performs a fast Fourier transform of the impulse response of the sound point, divides the power spectrum calculated by the fast Fourier transform by an arbitrary frequency bandwidth, averages the power spectrum of the obtained arbitrary frequency band, and averages The sound pressure data corresponding to the obtained power spectrum is calculated as sound pressure data at a plurality of sound receiving points, and a sound field simulation is performed. With this configuration, the impulse response characteristic data of the plurality of speakers is calculated based on the sound pressure data calculated at the plurality of sound receiving points. Therefore, the three-dimensional directional characteristic data including the phase interference of the plurality of speakers is calculated. Can be obtained.

[0007] A reproduced sound field simulation method according to the present invention comprises: a speaker to which a sound source signal is inputted and which outputs a loud sound;
A microphone to which a loudspeaker output from the speaker is input, and a signal processing unit to which an audio signal output from the microphone is input and signal processing of a sound source signal output to the speaker and an audio signal input from the microphone An impulse response data acquisition device comprising: a speaker rotation device for rotating the speaker in a predetermined direction; and a control device for controlling the signal processing device and the speaker rotation device. A data arithmetic processing device for performing arithmetic processing on the impulse response characteristic data of the loudspeaker, and a frequency band dividing device for dividing a loudspeaker loudspeaked by the plurality of loudspeakers into an arbitrary frequency band and outputting a loudspeaker signal to the speaker The impulse response characteristic data of the frequency band dividing device A frequency band dividing apparatus for performing an impulse response operation, and a speaker system including one or more loudspeakers, and an impulse response data acquisition apparatus for obtaining the impulse response of each loudspeaker of the loudspeaker system. Sound that is calculated using any one or two or more of a device, a data processing device, a frequency band dividing device, and a frequency band dividing device and an impulse response calculating device, and sets a sound field region for simulating sound field characteristics. A sound field area setting step; a sound absorption coefficient setting step of setting a sound absorption coefficient of a wall portion forming the sound field area; a speaker system arranging step of arranging a speaker system in the sound field area; A sound receiving point setting step of setting a sound receiving point, and a time-series sound pressure level of the speaker system obtained at the plurality of sound receiving points. A first loudspeaker data calculating step of calculating direct sound data and reflected sound data based on the first loudspeaker system, and a second loudspeaker data calculating step of calculating impulse response characteristic data of the speaker system at the plurality of sound receiving points. Calculating sound pressure data at the plurality of sound receiving points based on the direct sound data and reflected sound data obtained in the data calculating step and the impulse response characteristic data of the speaker system obtained in the second loudspeaker data calculating step; It has a configuration for performing a sound field simulation. With this configuration, since the sound pressure data in the sound field area is calculated, the directional characteristics of the speaker system in the arbitrary sound field area can be calculated, and the accurate overall sound characteristics of the speaker system in the arbitrary sound field area can be obtained. Can be.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] FIGS. 1 and 2 are views showing an embodiment of an impulse response measuring device according to the present invention.

The impulse response measuring device 20 of the present invention shown in FIGS.
And a speaker 22 that receives a sound source signal and outputs a loudspeaker, a microphone 23 that receives a loudspeaker output from the speaker 22, and an audio signal that is output from the microphone 23 and is input to the speaker 22. A signal processing means 24 for processing the output sound source signal and an audio signal input from the microphone 23, a speaker rotating means 25 for rotating the speaker 22 in a predetermined direction, and controlling the signal processing means 24 and the speaker rotating means 25 And control means 26 for performing the operation.

The control means 26 controls the loudspeaker 22 to rotate in a predetermined direction in synchronization with the sound source signal output from the signal processing means 24. An arithmetic processing is performed based on the sound source signal and the audio signal input from the microphone 23 to obtain data of the impulse response characteristics of the speaker 22.

As shown in detail in FIG. 3, the speaker rotating means 25 includes a first electric motor 27, a first holding member 28 driven to rotate about the Z axis by the first electric motor 27, A second holding member 29 that holds the speaker 22 and is rotatably held by the first holding member 28 so as to rotate around the X axis, and is attached to the first holding member 28 so as to rotate the second holding member 29. Second electric motor 30
And Thus, the speaker rotating means 2
Numeral 5 performs two-axis rotation including a horizontal rotation α for rotating the speaker 22 around the Z axis and a vertical rotation β for rotating the speaker 22 around the X axis.

The signal processing means 24 is provided outside the anechoic chamber 21 and comprises an AD converter and a DSP. The signal processing means 24 monitors the voltage and current values of the signal input to the speaker 22, outputs a sound source signal, and outputs a microphone output signal. Input, FFT
The analyzer function and impulse response are calculated. The control means 26 comprises a personal computer 31 which obtains data of the impulse response characteristics of the speaker 22 in synchronization with the rotation of the speaker 22, and amplifies the sound source signal from the signal processing means 24 outside the anechoic chamber 21. An amplifier 32 is provided.

In this embodiment, a chirp signal is used as a sound source signal in order to obtain data of impulse response characteristics at high speed. Here, the chirp signal is a sound source signal having a frequency signal extending from a low frequency range to a high frequency range.

Next, a method for acquiring impulse response characteristic data of the speaker 22 by the impulse response measuring device of the present invention will be described.

First, the first electric motor 27 and the second electric motor 30 are operated, and the first holding member 28 and the second holding member 29 are moved to move the speaker 22 around the Z-axis.
Degrees and 0 degrees around the X axis.

Next, a chirp signal is output by the signal processing means 24 while rotating the first holding member 28 around the Z-axis, and the chirp signal amplified by the amplifier 32 and input to the speaker 22 is input. The speaker 22 outputs a loudspeaker sound loudspeaked based on the input chirp signal to the microphone 23. The microphone 23 collects a loud sound, and inputs the sound signal to the signal processing unit 24. The signal processing means 24 calculates the transfer function of the speaker 22 from the chirp signal output to the speaker 22 and the audio signal output from the microphone 23, and from this transfer function, the impulse at 0 degree around the X axis of the speaker 22 Calculate the response characteristics.

When the loudspeaker 22 is rotated about the Z axis, the loudspeaker 22 is first rotated by 0 to 180 degrees, and the impulse response characteristics are continuously calculated while rotating the loudspeaker. The calculated data for a half turn is transferred to the personal computer 31 and stored in the personal computer 31.

Further, the speaker 22 is moved around the Z-axis by one.
The camera is rotated by 80 to 360 degrees, the remaining half of the circumference is calculated in the same manner, and the calculated data is similarly transferred to the personal computer 31 and stored in the personal computer 31.

Next, a chirp signal is generated by the signal processing means 24 while rotating the speaker 22 around the X axis by a predetermined angle, for example, 5 degrees, and again rotating the speaker 22 around the Z axis. Similarly, the signal is input to the speaker 22, collected by the microphone 23, and the signal processing means 24 calculates the impulse response of the speaker 22 at 5 degrees around the X axis.

As described above, the speaker 22 is calculated at any angle from 0 to 360 degrees around the X axis, and the impulse response characteristic data of the speaker 22 in all directions is measured.
The input angle and the number of data can be arbitrarily controlled by the personal computer 31 according to the rotation speed of the speaker 22 or the number of data to be taken. For example, as the measurement time when the measurement is performed under the conditions of 8192 impulse data, a sampling frequency of 65336 Hz, a horizontal (around the Z axis) capture angle of 1.8 degrees, and a vertical (around the X axis) capture angle of 5 degrees. When set at 115 seconds per rotation (around the Z axis), the impulse response can be calculated and measured sufficiently,
By simple calculation, 4255 seconds (71) in all directions (around the X axis)
Minutes).

As described above, according to the impulse response measuring device of the first embodiment of the present invention, the sound source signal is amplified while rotating the speaker 22 around the Z-axis by the rotating means, and the amplified sound is amplified by the microphone. The impulse response characteristics of the speaker 22 can be calculated from the audio signal input to the microphone 23 and output from the microphone 23 to the signal processing unit 24 and the sound source signal input to the speaker 22.
This calculation can be performed around the X axis.

Further, since the speaker rotating means 25 is controlled by the personal computer 31 to synchronize the sound source signal, the impulse response characteristic data of the speaker 22 can be obtained automatically and in a short time.
Since the impulse response characteristic data is a directional characteristic including a phase characteristic of the speaker, it is possible to obtain a phase interference in consideration of a distance time difference.

In this embodiment, the case where the speaker 22 is calculated and measured has been described. However, the present invention can measure the impulse response characteristics of not only the speaker 22 but also the speaker unit. [Second Embodiment] First, as shown in FIG. 4, a speaker 42 to which a sound source signal is input and outputs a loud sound,
Microphone 43 to which the loudspeaker sound output from is input
And a signal processing means 44 for receiving an audio signal output from the microphone 43 and processing a sound source signal output to the speaker 42 and an audio signal input from the microphone 43, and rotating the speaker 42 in a predetermined direction. An impulse response characteristic data acquisition device 40 including a speaker rotation unit 45, and a control unit 46 for controlling the signal processing unit 44 and the speaker rotation unit 45, and the impulse response characteristic data acquired by the impulse response characteristic data acquisition unit 40. Data arithmetic processing device 50 for performing arithmetic processing
Prepare

The control means 46, as in the first embodiment,
It consists of a personal computer. Further, a data processing unit 50 for performing arithmetic processing on the impulse response characteristic data is incorporated in a personal computer as the control means 46.

Next, as shown in FIG. 5, a plurality of speakers 42 are arranged adjacent to each other to form a speaker group 56. here,
The speaker group 56 includes a front 58, a center point C, and a front 58.
, And a speaker axis S that passes through the center point C.

Next, a center point C and a speaker axis S of the speaker group 56 are set, a sound field area 53 surrounding the plurality of speakers 42 is set, and a plurality of sound receiving points 54 are set in the sound field area 53. Set.

Next, the distance D from the center point C of the speaker group 56 to the plurality of sound receiving points 54 is measured, and a line 55 connecting the center point C of the speaker group 56 and the plurality of sound receiving points 54 is determined. The angle A formed by the speaker axis S of the group 56 is measured.

Next, impulse response characteristic data of a plurality of speakers 42 corresponding to the measured distance D and angle A are acquired by the impulse response characteristic data acquisition device 40, and the data operation processing device 50 adds the impulse response characteristic data. I do.

The added impulse response characteristic data of the specific sound receiving point 54 is subjected to a fast Fourier transform, and the power spectrum calculated by the fast Fourier transform is divided by an arbitrary frequency bandwidth and obtained by dividing. A power spectrum of an arbitrary frequency band is averaged, and sound pressure data corresponding to the averaged power spectrum is converted into a plurality of sound receiving points 54.
Is calculated as the sound pressure data.

Here, each speaker 4 of the speaker group 56
The impulse response characteristic data acquisition device 40 that acquires the second impulse response characteristic data is the same as that of the first embodiment of the present invention, and the method of acquiring the impulse response characteristic data of each speaker 42 is omitted.

The sound field area 53 set in the sound field area setting step is a spherical area having a predetermined radius surrounding the speaker group 56 from the center point C of the speaker group 56, and this sphere is a polar data sphere. That. Further, a plurality of sound receiving points 54 are set at 36 from the center point C of the speaker group 56.
Set 0 degrees equally in all directions.

Next, a method of acquiring impulse response characteristic data of a plurality of speakers 42 by the sound field simulation method of the present invention will be described with reference to FIG.

First, as shown in FIG. 6, in a speaker arrangement step, a plurality of speakers 42 are combined to construct a speaker group 56, and the arrangement position of each speaker 42, the speaker axis H of each speaker 42, and the speaker group. 56
Of the speaker axis S is set (S-1).

Next, the radius of the polar sphere is set (sound field area setting step) (S-2). When this polar radius is set, a plurality of sound receiving points 54 are automatically set in the sound field area 53. (Sound receiving point setting step) (S-3). The impulse response characteristics of each speaker 42 of the speaker group 56 at each sound receiving point 54 are acquired by the impulse response characteristic data acquisition device 40 (S-4), and the impulse response characteristics of the speaker group 56 at each sound receiving point 54 are obtained. , Ie, the sound pressure data. The process of calculating the sound pressure data is as follows.

First, one sound receiving point 54 is selected, the distance between the sound receiving point 54 and the center point C of the speaker group 56 is calculated (distance measuring step), and the sound receiving point 54 and the center point C are determined. The angle formed between the connected line and the speaker axis S of the speaker group 56 is calculated (angle measurement step) (S-5).

Next, the impulse response characteristic data of each of the speakers 42 of the loudspeaker group 56 obtained by the impulse response characteristic data acquisition device corresponding to the distance measured in the distance measurement step and the angle measured in the angle measurement step are time-series. The sound pressure data at the sound receiving point 54 is obtained (S-
6). Next, the sound pressure data at the sound receiving point 54 is subjected to a fast Fourier transform (hereinafter, simply referred to as FFT) calculation to obtain a power spectrum of each frequency (S-7). Is divided by a desired bandwidth (1/1, 1/3... 1 / nOct.), The power spectrum in this bandwidth is averaged, and the average is obtained.
Repeated for each speaker group 5 at each sound receiving point 54
6 are obtained (S-8).

As described above, according to the present embodiment, a plurality of sound receiving points are set 360 degrees from the center of rotation of the plurality of speakers.
Degrees are set uniformly in all directions, so that the three-dimensional directivity characteristics of the speaker group are calculated, and the power spectrum calculated in the FFT operation process uses the chirp signal as the sound source for measurement. The phase characteristic and the distance-time difference between the speakers can be measured. Therefore, a power spectrum including the phase interference can be obtained, and the three-dimensional directional characteristic data of the speaker group including the phase interference can be calculated.

Although the sound field simulation of a group of speakers has been described in the present embodiment, the present invention can similarly calculate a sound field simulation for a speaker composed of a plurality of speaker units.

[Third Embodiment] First, as shown in FIG.
A frequency band dividing device 60 that divides a loudspeaker loudspeaked by a plurality of speakers that receive a sound source signal and outputs a loudspeaker sound into an arbitrary frequency band and outputs a loudspeaker signal to the loudspeaker; And a frequency band dividing device impulse response calculating device 61 for calculating the response characteristic data by a predetermined method.

Next, the impulse response characteristic data of the frequency band dividing device 60 obtained by the frequency band dividing device impulse response computing device is added to the impulse response characteristic data of a plurality of speakers computed by the data computing and processing device 56. Data processing unit 56 based on data
The sound pressure data at a plurality of sound receiving points is calculated.

Here, the present embodiment is characterized in that the speaker group 56 in the second embodiment is constituted by a plurality of speakers having different reproduction frequencies, and other configurations and operations are the same as those of the second embodiment. Since the second embodiment is the same as the second embodiment, the same components and steps as those of the second embodiment are denoted by the same reference numerals as those of the second embodiment, and description thereof will be omitted.

In this embodiment, a processor, a dividing network circuit, or a graphic equalizer (hereinafter, referred to as a processing circuit) for processing the reproduction frequency is used as a means for dividing the reproduction frequency in order to input an appropriate reproduction frequency of each speaker of the speaker group 56. , A GEQ) is connected to the front of the speaker 42 and used. Therefore, in the frequency band dividing device 61, the reproduction frequency is processed, and the loudspeaker output from the speaker 42 becomes a total characteristic of the characteristics of the frequency band dividing device 61 and the speaker characteristics.

Therefore, in the present embodiment, the overall characteristics of the impulse response characteristics of the frequency division device 61 and each speaker 42 are calculated by calculating the impulse response characteristics of the frequency band division device 61 and each speaker 42. It is supposed to.

Next, the simulation operation of this embodiment will be described with reference to FIG. First, a frequency band dividing device 61 (impulse response) used by connecting to a plurality of speakers 56 having different reproduction frequency bands such as a processor, a dividing network circuit, and a GEQ is calculated and measured by a predetermined method (frequency band dividing means). Impulse response calculation step).

For example, when a dividing network circuit is used, the dividing network circuit divides a reproduction frequency band into a high frequency range, a medium frequency range, and a low frequency range, and in each frequency band, a characteristic of a speaker is adjusted. Frequency processing is performed in accordance therewith, and signals are input to the speakers 42 corresponding to each frequency band. For this reason, since the impulse characteristics are different for each frequency band, an impulse response must be calculated for each frequency band and multiplied by the impulse response characteristic data of the speaker 42.

Next, each speaker 4 of the speaker group 56
2 are set (S-1), and the sound field area is set (S-
2) A sound receiving point is set in this sound field area (S-3).
Next, impulse response characteristic data of each speaker 42 of the speaker group 56 is acquired by the impulse response characteristic acquisition device 40.

Next, the measured / calculated data of the frequency band dividing device 61 or the data in the database and the impulse of the processor or the network suitable for each speaker impulse response characteristic data corresponding to the frequency band dividing device 61 are shown. The response characteristic data is multiplied (S-11).

Further, the omnidirectional impulse response for each speaker is calculated in the same manner as in the second embodiment, and the sound pressure data at each sound receiving point is calculated according to the flowchart of FIG. Therefore, the power spectrum including the phase interference can be obtained as in the second embodiment, and the three-dimensional directional characteristic data of the speaker group 56 including the phase interference can be calculated.

As described above, according to the present embodiment, the measured characteristics of the network circuit, the processor or the GEQ are calculated, and the measured impulse response characteristic data is multiplied by the omnidirectional impulse response characteristic data of each speaker of the speaker group. The power spectrum including the phase interference of the loudspeakers having different reproduction frequency bands can be obtained by combining them, and the power spectrum of the loudspeakers including the phase interference can be obtained.
Calculation of dimension directivity data can be performed.

In this embodiment, the sound field simulation of a speaker group constituted by a plurality of speakers having different reproduction frequencies has been described. However, the present invention relates to a speaker constituted by a plurality of speaker units having different reproduction frequencies. The sound field simulation can be similarly calculated. [Fourth Embodiment] The present embodiment has the same structure as the third embodiment, and differs from the third embodiment only in the steps. Therefore, the same parts as those in the third embodiment are given the same reference numerals and description thereof is omitted.

First, as shown in FIG. 9, a speaker 42 to which a sound source signal is input and outputs a loud sound, a microphone 43 to which a loud sound output from the speaker 42 is input,
A signal processing means 44 for receiving a sound signal output from the microphone 43 and processing a sound source signal output to the speaker 42 and a sound signal input from the microphone 43, and a speaker for rotating the speaker 42 in a predetermined direction. An impulse response characteristic data acquisition device 40 including a rotation unit 45, a control unit 46 for controlling the signal processing unit 44 and the speaker rotation unit 45, and an impulse of the speaker 42 acquired by the impulse response characteristic data acquisition unit 40. A data arithmetic processing device 50 for arithmetically processing the response characteristic data; and a frequency band dividing device 61 for dividing a loudspeaker loudspeaked by the loudspeaker group 56 into an arbitrary frequency band and outputting a loudspeaker signal to the loudspeaker
And a frequency band dividing device impulse response calculating device 62 for calculating the impulse response characteristic data of the frequency band dividing device 61 by a predetermined method. Next, a speaker system 70 including one or more speakers is prepared.
FIG. 10 shows an example. The speaker system shown in FIG. 10 includes a speaker group including a high-frequency speaker, a medium-frequency speaker, and a low-frequency speaker, a full-range speaker, and a ceiling speaker.

Next, the impulse response of each speaker 42 of the speaker system 70 is determined by using one of the impulse characteristic data acquisition device 40, the data operation processing device 50, the frequency band division device 61, and the frequency band division device impulse response operation device 62. One or two or more,
Set the sound field area that simulates the sound field characteristics, set the sound absorption coefficient of the wall that forms the sound field area, place the speaker system in the sound field area, and set multiple sound receiving points in the sound field area. Is calculated, direct sound data and reflected sound data are calculated based on the time-series sound pressure levels of the speaker system obtained at the plurality of sound receiving points, and impulse response characteristic data of the speaker system at the plurality of sound receiving points are calculated. . Sound pressure data at a plurality of sound receiving points is calculated based on the direct sound data, the reflected sound data, and the impulse response characteristic data of the speaker system 70.

FIG. 11 is a diagram showing a sound pressure data calculating step in the present embodiment, and shows a process of calculating sound pressure data at the sound receiving point 54.

In FIG. 11, sound pressure energy in a space (not shown) is obtained by the virtual image method and the sound ray method using the speaker 42 or the speaker group 56 as a sound source, and the direct sound 81 and the reflection surface in a certain frequency band of the sound pressure energy are obtained. Reference numeral 83 denotes a reflected sound 82 generated at the sound receiving point 54 due to reflection of the loud sound. The direct sound 81 and the reflected sound 82 generated at the sound receiving point 54 are added to the impulse characteristic data acquisition device 40, the data operation processing device 50, and the frequency band division device 61 from the frequency band division device 61 by the frequency band division device impulse response operation device 62. The response characteristic data is multiplied by the total impulse response characteristic data of the speaker 42 or the impulse response data of the speaker group 56, and the speaker 42 or the speaker group 56 of the speaker system generated at the sound receiving point 54 is obtained.
Are calculated and calculated, and all the calculated and calculated impulse response characteristic data are added to calculate the sound pressure data of the sound receiving point 54 in a certain frequency band. By performing this in the entire frequency band, the sound pressure data at the sound receiving point 54 can be calculated.

As described above, the sound field simulation according to the present embodiment is based on the acoustic synthesis of a speaker system composed of one or more speakers or a speaker group or an at least one speaker and a speaker group in an arbitrary building space on a computer. Characteristics can be calculated.

Next, the simulation operation of this embodiment will be described with reference to FIG.

First, the speaker system 70 is set.
When the speaker group 56 including a plurality of speakers is to be set, the same arrangement position of each speaker and the angle of each speaker axis are set as in the second embodiment of the present invention (S-21).

Next, the impulse response characteristics of the prepared speaker group 56 or speaker 42 are measured and calculated (S-22).

Here, for the measurement and calculation of the impulse response characteristic, in the case of the speaker 42, the impulse response characteristic acquisition device 40 acquires the impulse response characteristic data of the speaker as in the first embodiment of the present application. In the case of the speaker group 56, comprehensive impulse response characteristic data is obtained by simulation using a method similar to that of the second embodiment of the present invention. In the case of loudspeaking different reproduction frequencies from the loudspeaker group 56, similarly to the third embodiment of the present invention, the measured / calculated data of the frequency band dividing device 61 or the data in the database and the frequency band dividing device impulse response calculating device 62 By multiplying each speaker impulse response characteristic data corresponding to the frequency band division device 61 by an appropriate processor or network impulse response characteristic data, and calculating impulse response characteristic data of a speaker group having different reproduction frequencies, The overall impulse response characteristic data of the speaker group 56 is obtained.

Next, an architectural space for simulating the overall acoustic characteristics of the speaker system 70 is set (space shape setting step) (S-23). Next, material sound absorption coefficient data is set from the material database for the interior wall material of the building space (sound absorption coefficient setting step) (S-24).

Next, the position of the prepared speaker system 70 is set (speaker position input step) (S-25).
Next, a point at which sound pressure data is to be calculated in this space, that is, a so-called sound receiving point is set (a sound receiving point setting step in the space) (S-
26). Next, a direct sound and a reflected sound are calculated for each frequency band from a time-series sound pressure energy array (hereinafter simply referred to as an echo time pattern) of the entire building space obtained by a sound ray method / a virtual image method using a speaker as a sound source. (A first loudspeaker data calculating step), and a geometrical path between the speaker system 70 serving as a sound source corresponding to the direct sound and the reflected sound and a sound receiving point in each space is obtained.

Therefore, the distance between the speaker 42 or the speaker group 56 which is to be incident on the sound receiving point, the direct sound path and the reflected sound path from the sound receiving point, and the respective direct sound paths at the sound receiving point. And all angles of the reflected sound path can be calculated (S-27).

Next, the speaker 4 corresponding to the calculation result
The impulse response characteristic data of the second or speaker group 56 is calculated (S-28). Next, a convolution operation is sequentially performed on the calculated echo time pattern in the time series with the time series waveform cut out from the calculated impulse response characteristic data of the speaker 42 or the speaker group 56 by the filter of the same band. (S-29). As described above, sound pressure data at each sound receiving point can be calculated by adding the impulse response characteristics of each frequency band calculated at each sound receiving point.

As described above, according to the embodiment of the present invention, the echo time pattern calculated by the conventional geometric acoustic theory such as the virtual image method and the acoustic ray method, and the speaker impulse response characteristic data corresponding to the echo time pattern are obtained. By performing the convolution operation in, the sound pressure data including the loudspeaker directional characteristics and phase interference at any point in any space can be calculated on the computer, so that the total acoustic characteristics of the accurate speaker system in that space can be calculated. Obtainable.

[0065]

As described above, according to the present invention, the impulse response characteristics including the phase interference in consideration of the directional characteristics of the omnidirectional speaker and the distance time difference of the loudspeaker are automatically and in a short time with an arbitrary number of data. Can be measured.

Further, the present invention uses the measured impulse response characteristic data of the loudspeaker group in all directions and the distance difference from the plurality of loudspeaker groups to the sound receiving point to obtain the three loudspeakers including the phase interference. It is possible to calculate the dimensional directivity characteristics data and the impulse response characteristics with high accuracy in the direct sound field.

The present invention performs a convolution operation using sound pressure level data, such as the conventional virtual image method and sound ray method, and speaker impulse response characteristics for each direction, so that a speaker at an arbitrary point in an arbitrary space on a computer. System-oriented characteristics
Since sound pressure data including phase interference can be calculated, it is possible to obtain accurate total acoustic characteristics in an arbitrary building space by various combinations of speakers and speaker groups.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an impulse response characteristic acquisition device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a speaker rotating unit according to the first embodiment of the present invention.

FIG. 3 is a diagram for explaining speaker rotation in the first embodiment of the present invention.

FIG. 4 is a schematic diagram of an impulse response characteristic acquisition device and a data processing device according to a second embodiment of the present invention.

FIG. 5 is a diagram illustrating a sound field area of a speaker group according to a second embodiment of the present invention.

FIG. 6 is a flowchart illustrating operations of an impulse response characteristic acquisition device and a data processing device according to a second embodiment of the present invention.

FIG. 7 is a schematic diagram of an impulse response characteristic acquisition device, a data operation processing device, a frequency band division device, and a frequency band division device impulse response operation device according to a third embodiment of the present invention.

FIG. 8 is a flowchart showing operations of an impulse response characteristic acquisition device, a data processing device, a frequency band dividing device, and a frequency band dividing device impulse response calculating device according to a third embodiment of the present invention.

FIG. 9 is a schematic diagram of an impulse response characteristic acquisition device, a data operation processing device, a frequency band division device, and a frequency band division device impulse response operation device according to a fourth embodiment of the present invention.

FIG. 10 is a perspective view of a speaker system according to a fourth embodiment of the present invention.

FIG. 11 is a diagram illustrating calculation of sound pressure data at a sound receiving point according to a fourth embodiment of the present invention.

FIG. 12 shows the operation of an impulse response measuring device, a data processing device, a frequency band dividing device and a frequency band dividing device according to a fourth embodiment of the present invention, and a simulation of a sound field in a speaker system in space. It is a flowchart shown.

[Explanation of symbols]

 22, 42 Speaker 23, 43 Microphone 24, 44 Signal processing device 25, 45 Speaker rotating means 26, 46 Control means 40 Impulse response characteristic data acquisition device 50 Data operation processing device 70 Speaker system 61 Frequency band division device 62 Frequency division device Impulse Response calculation device S-1 Speaker placement process S-2, S-22 Sound field area setting process S-3, S-26 Sound receiving point setting process S-5 Distance measurement process, angle measurement process S-24 Sound absorption coefficient setting process S-25 Speaker placement step S-27 First loudspeaker data calculation step S-28 Second loudspeaker data calculation step

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuei Sato 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 2G064 AB18 BA05 BA21 CC17 CC35 CC42 5D062 CC16

Claims (6)

[Claims] 1. A speaker to which a sound source signal is input to output a loudspeaker, a microphone to which a loudspeaker output from the loudspeaker is input, and an audio signal output from the microphone to be input and output to the loudspeaker Signal processing means for performing signal processing on a sound source signal and a sound signal input from the microphone; speaker rotating means for rotating the speaker in a predetermined direction; control means for controlling the signal processing means and the speaker rotating means; ,
The speaker is rotated in a predetermined direction in synchronization with the sound source signal output from the signal processing means by the control means, and the signal is generated based on a sound source signal output to the speaker and an audio signal input from the microphone. An impulse response characteristic data acquisition apparatus, wherein the processing means performs arithmetic processing to obtain impulse response characteristic data of the speaker. 2. A speaker to which a sound source signal is input to output a loudspeaker, a microphone to which a loudspeaker output from the loudspeaker is input, and an audio signal output from the microphone to be input and output to the loudspeaker Signal processing means for performing signal processing on a sound source signal and a sound signal input from the microphone; speaker rotating means for rotating the speaker in a predetermined direction; control means for controlling the signal processing means and the speaker rotating means; Prepare an impulse response characteristic data acquisition device comprising: and a data arithmetic processing device for arithmetically processing the impulse response characteristic data acquired by the impulse response characteristic data acquisition device; A speaker disposing step for setting a speaker center and a speaker axis; A sound field area setting step of setting a sound field area surrounding a speaker, a sound receiving point setting step of setting a plurality of sound receiving points in the sound field area, and the plurality of sound receiving points from a center of the plurality of speakers. A distance measuring step of measuring a distance to a point, an angle measuring step of measuring an angle formed between a line connecting the centers of the plurality of speakers and the plurality of sound receiving points and speaker axes of the plurality of speakers, Acquiring impulse response characteristic data of a plurality of speakers corresponding to the distance measured in the distance measurement step and the angle measured in the angle measurement step by the impulse response characteristic data acquisition device,
The data arithmetic processing device adds impulse response characteristic data, performs a fast Fourier transform of the added impulse response characteristic of a specific sound receiving point, and divides a power spectrum calculated by the fast Fourier transform into an arbitrary frequency bandwidth. Then, a power spectrum of an arbitrary frequency band obtained by division is averaged, sound pressure data corresponding to the averaged power spectrum is calculated as sound pressure data at a plurality of sound receiving points, and a sound field simulation is performed. A sound field simulation method characterized by the above. 3. A frequency band dividing device that divides a loud sound amplified by the plurality of speakers into a plurality of parts in an arbitrary frequency band and outputs a loudspeaker signal to the speakers.
A frequency band dividing device for calculating the impulse response characteristic data of the frequency band dividing device by a predetermined method, and an impulse response characteristic of the plurality of speakers calculated by the data processing device. The data processing unit calculates sound pressure data at a plurality of sound receiving points based on the added data obtained by adding the impulse response characteristic data of the frequency band dividing device obtained by the frequency band dividing device impulse response calculating device. The sound field simulation method according to claim 2, wherein: 4. A speaker to which a sound source signal is input to output a loudspeaker, a microphone to which a loudspeaker output from the loudspeaker is input, and a sound signal output from the microphone to be input and output to the speaker Signal processing means for performing signal processing on a sound source signal and a sound signal input from the microphone; speaker rotating means for rotating the speaker in a predetermined direction; control means for controlling the signal processing means and the speaker rotating means; An impulse response characteristic data acquisition device comprising: a data arithmetic processing device for arithmetically processing the impulse response characteristic data of a speaker acquired by the impulse response characteristic data acquisition device; and a loudspeaker sound amplified by the plurality of speakers. Divide into multiples in an arbitrary frequency band and output a loudspeaker signal to the speaker A frequency band dividing apparatus, a frequency band dividing apparatus for calculating impulse response characteristic data of the frequency band dividing apparatus by a predetermined method, and a speaker system including one or more speakers, and The impulse response characteristic data of each speaker of the speaker system is calculated by using one or more of the impulse response characteristic data acquisition device, the data operation processing device, the frequency band division device, and the frequency band division device impulse response operation device. A sound field area setting step of setting a sound field area that simulates a sound field characteristic; a sound absorption coefficient setting step of setting a sound absorption coefficient of a wall forming the sound field area; and a speaker in the sound field area. A speaker system arranging step for arranging the system, and a sound receiving point setting for setting a plurality of sound receiving points in the sound field area. Setting step, first sound data calculation step of calculating direct sound data and reflected sound data based on the time-series sound pressure level of the speaker system obtained at the plurality of sound receiving points, and a speaker at the plurality of sound receiving points A second loudspeaker data calculating step of calculating impulse response characteristic data of the system, wherein the direct sound data and the reflected sound data obtained in the first loudspeaker data calculating step and the loudspeaker system obtained in the second loudspeaker data calculating step. A sound pressure data at the plurality of sound receiving points based on the impulse response characteristic data. 5. The reproduced sound field simulation method according to claim 2, wherein the sound field region is formed of a spherical space having a predetermined polar radius. 6. The impulse response according to claim 1, wherein the sound source signal is a frequency signal extending from a low frequency range to a high frequency range, thereby making the loudspeaker sound a frequency signal extending from a low frequency range to a high frequency range. Characteristic data acquisition device.