JPH08130793A - Acoustic reproducing device - Google Patents

Abstract

PURPOSE: To provide a multi-channel acoustic reproducing device without limitation on the arrangement of a reproducing loudspeaker. CONSTITUTION: After low-pass area correction is applied to a first sound pressure signal 2, a first forward/backward direction velocity signal 3 and a first rightward/leftward direction velocity signal 4 by a matrix circuit 5. high-pass area correction in a first step is applied to them by three high-pass area correction filters 9-11, and corrected signals are distributed to five signals by a regular pentagonal distribution matrix circuit 12. The high-pass area correction in a second tep is applied to distributed signals 13-17 by individual high-pass correction filters 18-22, respectively, and after that, they are reproduced by five loudspeakers 28-32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to sound field reproduction of a sound reproducing device having a plurality of output channels.

[0002]

2. Description of the Related Art A sound pressure signal representing a sound pressure of a sound field at a listening position and a velocity signal representing a particle velocity of a sound field are subjected to different processing in a low range and a high range, and reproduced from a plurality of speakers to be heard. There is a sound reproduction device that reproduces the correct sound field. Such a sound reproducing device is disclosed in, for example, Japanese Patent Publication No. 1-308080.

FIG. 9 is a block diagram showing the basic structure of the above-mentioned sound reproducing device. In the figure, 1 is an input terminal, 2 is a first sound pressure signal, 3 is a first longitudinal velocity signal, 4 is a first lateral velocity signal, and 5 is a first matrix circuit. 6, 7 and 8 are respectively the first matrix circuit 5
Output signals of the second sound pressure signal, the second speed signal in the front-rear direction, and the second speed signal in the left-right direction. Reference numeral 9 is a first high-frequency correction filter, 10 is a second high-frequency correction filter, 11 is a third high-frequency correction filter, and 12 is a regular pentagonal distribution matrix circuit. Reference numerals 13, 14, 15, 16 and 17 denote a left channel audio signal, a center channel audio signal, a right channel audio signal, a rear left channel audio signal and a rear right channel audio signal which are output signals of the regular pentagonal distribution matrix circuit 12, respectively. . Reference numeral 23 is a first power amplifier that amplifies the left channel audio signal 13, and 28 is a left channel speaker driven by the first power amplifier 23. Reference numeral 24 is a second power amplifier that amplifies the center channel audio signal 14, and 29 is a center channel speaker driven by the second power amplifier 24. Reference numeral 25 is a third power amplifier for amplifying the right channel audio signal 15, and 30 is a right channel speaker driven by the third power amplifier 25. 26 is a fourth power amplifier for amplifying the rear left channel audio signal 16,
Reference numeral 31 is a rear left channel speaker driven by the fourth power amplifier 26. 27 is a fifth power amplifier for amplifying the rear right channel audio signal 17,
A rear right channel speaker 32 is driven by the fifth power amplifier 27.

Next, the operation will be described. The first sound pressure signal 2, the first longitudinal velocity signal 3, and the first lateral velocity signal 4 input to the input terminal 1 are input to the first matrix circuit 5.

In the first matrix circuit 5, the first longitudinal velocity signal 3 is multiplied so that the direction of the velocity vector reproduced at the listening position coincides with the direction of the velocity vector at the time of sound collection. After being multiplied by the coefficient, it is added to the adjusted first sound pressure signal 2 to obtain the second longitudinal velocity signal 7
become. The first left-right velocity signal 4 is multiplied by a multiplication coefficient so that the direction of the velocity vector reproduced at the listening position coincides with the direction of the velocity vector at the time of sound collection. Becomes Also, the first sound pressure signal 2
Is adjusted so that the difference between the magnitude of the velocity vector reproduced at the listening position and the magnitude of the velocity vector at the time of sound collection becomes the minimum value, and becomes the second sound pressure signal 6. The velocity vector here is a vector represented by the equation 1.

[0006]

[Equation 1]

As for a low-frequency sound, a human recognizes a sound image in the direction of this velocity vector. Therefore, in order to reproduce a sound field that is audibly correct, the direction of the velocity vector at the time of sound collection and the velocity vector at the time of reproduction It is desirable that the directions of are the same.

The second sound pressure signal 6, the second front-rear speed signal 7, and the second left-right speed signal 8 are respectively a first high-frequency correction filter 9, a second high-frequency correction filter 10, and a third high-frequency correction filter 10. The first-step high-frequency correction is performed so that the high-frequency correction filter 11 can reproduce so that the direction of the energy vector reproduced at the listening position matches the direction of the energy vector at the time of sound collection. The first high band correction filter 9, the second high band correction filter 10, and the third high band correction filter 11 all have the same gain in the low band, and the gain at a frequency higher than 1 kHz is the first high band correction. The filter 9 has a frequency characteristic that is larger than the low band, and the second high band correction filter 10 and the third high band correction filter 11 have frequency characteristics that are smaller than the low band gain. The energy vector here is a vector represented by the equation 2.

[0009]

[Equation 2]

With regard to sounds in the high frequency range, humans recognize a sound image in the direction of this energy vector. Therefore, in order to audibly reproduce a sound field correctly, the direction of the energy vector at the time of sound collection and the energy vector at the time of reproduction It is desirable that the directions of are the same.

The output signals of the first high-frequency correction filter 9, the second high-frequency correction filter 10 and the third high-frequency correction filter 11 are input to the regular pentagonal distribution matrix circuit 12, and the left channel audio signal 13 and the center channel are input. The audio signal 14, the right channel audio signal 15, the rear left channel audio signal 16, and the rear right channel audio signal 17 are distributed. This distribution method uses the listening position as the center of gravity, and one of the vertices of the output signal of the second high-frequency correction filter 10 in the direction of each vertex of a regular pentagon in front of the listener, and outputs the output signal of the second high-frequency correction filter 10 in the front-rear direction and the third height. Band correction filter 11
Vector whose output signal is the velocity component in the left-right direction is distributed, the signal of the first high-frequency correction filter 9 is added to each distributed vector component, and normalization by the number of reproductions of the speaker, that is, the speaker in this conventional example. Since the number of is equal to 5, each addition result is divided by the square root of 5.

The left channel audio signal 13 is amplified by the first power amplifier 23 and reproduced by the left channel speaker 28. The center channel audio signal 14 is amplified by the second power amplifier 24 and reproduced by the center channel speaker 29. The right channel audio signal 15 is amplified by the third power amplifier 25 and reproduced by the right channel speaker 30. Rear left channel audio signal 1
6 is amplified by the fourth power amplifier 26 and reproduced by the rear left channel speaker 31. The rear right channel audio signal 17 is amplified by the fifth power amplifier 27 and reproduced by the rear right channel speaker 32.

[0013]

In the conventional sound reproducing apparatus, since the high frequency signal processing is performed only on the sound pressure signal and the speed signal, for example, the reproduction speaker arrangement of the high definition 3-1 system shown in FIG. In the speaker arrangement in which the opening angles of the left and right channel speakers are smaller than the opening angles of the rear left channel speaker and the rear right channel speaker, the first high frequency correction filter 9, the second high frequency correction filter 10 and the third high frequency correction filter 10 are used. No matter how the high-frequency gain of the high-frequency correction filter 11 is adjusted, the direction angle of the high-frequency energy vector at the listening position during reproduction and the direction angle of the high-frequency energy vector at the listening position during sound collection should match. I can't.

This is calculated. Number 3
FIG. 9 shows a matrix for obtaining the reproduction sound pressure of the sound reproduction device shown in FIG.

[0015]

(Equation 3)

For the matrix element of the above equation 3, a matrix element whose velocity vector is the same at the time of sound collection and reproduction and whose energy vector has the smallest difference between the time of sound collection and the time of reproduction is applied, and the calculated sound is obtained. FIG. 10 shows the relationship between the direction angle of the energy vector obtained by the pressure and Equation 2 and the direction angle of the energy vector at the time of sound collection. According to FIG. 10, when the energy vector direction at the time of sound collection is 0 °, the energy vector at the time of reproduction shows about 20 ° and they do not match. In FIG. 10, 0 ° is 90 ° to the right of the listener.
In front of the listener, 270 ° indicates the left side of the listener, respectively, and the above results indicate that the correct sound field cannot be audibly reproduced in the lateral direction.

The present invention has been made to solve the above problems, and in a speaker arrangement in which the opening angle between the left channel speaker and the right channel speaker is smaller than the opening angle between the rear left channel speaker and the rear right channel speaker. It is an object of the present invention to obtain a sound reproducing device capable of reproducing a reproduced sound field, particularly a direction angle of an energy vector in a high frequency range, more accurately at a listening position.

[0018]

According to a first aspect of the present invention, there is provided a sound reproducing device for a listener at the time of collecting a sound pressure signal representing a sound pressure at a listening position at the time of collecting a sound and a medium propagating a sound wave. Input means for inputting at least two velocity signals representing particle velocities decomposed into respective directional components, velocity vector at a listening position at the time of sound collection represented by the signals input from the input means, and a listening position at the time of reproduction A first matrix circuit that corrects each signal input to the input means so that the velocity vector reproduced in Fig. 1 does not change, and a corrected sound pressure signal among the output signals from the first matrix circuit. Filter means having a frequency characteristic for correcting the gain above a predetermined frequency to be larger than the gain below a predetermined frequency, and the output signal from the first matrix circuit Then, the corrected speed signal is corrected so that the gain above the predetermined frequency is smaller than the gain below the predetermined frequency, and the output signal of the filter means is linearly combined into five signals. A linear combination means for outputting, and a filter means for adjusting the gain of the output signal of the linear combination means to a gain determined by a speaker arrangement for reproducing the gain.
The output signal of the filter means is amplified and reproduced by five speakers.

According to a second aspect of the present invention, there is provided a sound reproducing device in which the sound pressure signal representing the sound pressure at the listening position at the time of sound collection and the directional components to the listener at the time of sound collection of the medium that propagates the sound wave. Input means for inputting at least two velocity signals representing decomposed particle velocities, filter means for separating the signals input from the input means into signals of a predetermined frequency or higher and signals of a predetermined frequency or lower, and the filter means. The sound pressure signal and each velocity signal separated by a predetermined frequency or less are input to the input means so that the velocity vector at the listening position during sound collection and the velocity vector reproduced at the listening position during reproduction do not change. A velocity vector correction matrix circuit for correcting each signal, a sound pressure signal separated at a predetermined frequency or more by the filter means, and a listening position at the time of collecting each velocity signal. An energy vector correction matrix circuit for correcting each signal input to the input means so that the energy vector in the reproduction position and the energy vector reproduced at the listening position during reproduction do not change, and the output signals from the two matrix circuits. Five signals are added by linear combination of an adding means for adding a sound pressure signal and a velocity signal to each other to produce a sound pressure signal and a velocity signal having the same bandwidth as the entire bandwidth at the time of sound collection and the output signal of the adder. It is composed of a linear combination means for outputting and a means for amplifying the output signals of the linear combination means and reproducing them by five speakers.

According to a third aspect of the present invention, there is provided a sound reproducing device in which the sound pressure signal representing the sound pressure at the listening position at the time of sound collection and the directional components to the listener at the time of sound collection of the medium that propagates the sound wave. Input means for inputting at least two input signals consisting of a complex linear combination of at least two velocity signals representing decomposed particle velocities, and the square of the original sound pressure signal and velocity signal from the signals input from the input means. A second matrix circuit that performs signal processing to create a sound pressure signal and a velocity signal such that an error is minimized, and a velocity vector at a listening position at the time of sound collection represented by an output signal from the second matrix circuit. A first matrix circuit that corrects each signal input to the input means so that the velocity vector reproduced at the listening position during reproduction does not change, and the first matrix circuit. Filter circuit having frequency characteristics for correcting the corrected sound pressure signal of the output signal from the output circuit so that the gain above the predetermined frequency is larger than the gain below the predetermined frequency, and the first matrix circuit. Of the output signals from the filter means having a frequency characteristic for correcting each of the corrected speed signals so that the gain above a predetermined frequency is smaller than the gain below a predetermined frequency, and the output signal of the filter means is linear. The linear combination means for outputting five signals by combination, the filter means for adjusting the gain of the output signal of the linear combination means above a specific frequency to the gain determined by the speaker arrangement, and the output signal of the filter means Each of them comprises means for amplifying and reproducing with 5 speakers.

[0021] According to a fourth aspect of the present invention, in the sound reproducing device, the sound pressure signal representing the sound pressure at the listening position at the time of collecting sound and the directional components for the listener at the time of collecting the sound wave propagating medium are collected. Input means for inputting at least two input signals consisting of a complex linear combination of at least two velocity signals representing decomposed particle velocities; and an original sound pressure signal and velocity signal represented by the signals input from said input means. A matrix circuit that processes each signal input to the input means so that the squared error between the velocity vector at the listening position during sound collection and the velocity vector reproduced at the listening position during reproduction is minimized; A frequency characteristic that corrects the corrected sound pressure signal of the output signal from the circuit so that the gain above the predetermined frequency is greater than the gain below the predetermined frequency. And a filter means having a frequency characteristic for correcting each corrected velocity signal of the output signal from the matrix circuit so that the gain of a predetermined frequency or higher becomes smaller than the gain of a predetermined frequency or lower, Linear combination means for outputting five signals by linear combination of the output signal of the filter means; and filter means for adjusting the gain of the output signal of the linear combination means to a gain determined by a speaker arrangement for reproducing the gain. , Amplifying the output signals of the filter means 5 respectively
It is composed of means for reproducing with individual speakers.

According to a fifth aspect of the present invention, there is provided a sound reproducing device in which the sound pressure signal representing the sound pressure at the listening position at the time of sound collection and the directional components to the listener at the time of sound collection of the medium that propagates the sound waves. Input means for inputting at least two input signals consisting of a complex linear combination of at least two velocity signals representing decomposed particle velocities, and the square of the original sound pressure signal and velocity signal from the signals input from the input means. A matrix circuit for performing signal processing to generate a sound pressure signal and a velocity signal such that an error is minimized; filter means for separating an output signal of the matrix circuit into a signal having a predetermined frequency or more and a signal having a predetermined frequency or less; The sound pressure signal and each velocity signal separated by the filter means to a predetermined frequency or less are reproduced at the velocity vector at the listening position at the time of sound collection and at the listening position at the time of reproduction. Speed vector correction matrix circuit that corrects each signal input to the input means so that the speed vector does not change, and a sound pressure signal and each speed signal separated by a predetermined frequency or more by the filter means An energy vector correction matrix circuit for performing a first-stage correction of each signal input to the input means so that the energy vector at the listening position and the energy vector reproduced at the listening position during reproduction do not change. An adder for adding each corrected sound pressure signal and each velocity signal, which are output signals from the circuit, to produce a sound pressure signal and velocity signal having the same bandwidth as the total bandwidth at the time of sound collection; Linearly combining means for outputting five signals by linearly combining the output signals of The filter means for adjusting the gain of the above-mentioned to the gain determined by the speaker arrangement for reproducing and performing the second stage correction of the energy vector direction angle, and the means for amplifying the output signals of the filter means respectively and reproducing them by the five speakers. It is a thing.

Further, according to a sixth aspect of the present invention, there is provided an audio reproducing apparatus, wherein input means for inputting audio signals of a plurality of channels in which directions of speakers to be reproduced viewed by a listener are determined, and the input means. Based on the direction angle of the speaker that reproduces the input audio signal, the sound pressure signal that represents the sound pressure at the listening position during reproduction and the particles decomposed into each direction component for the listener when collecting the medium that propagates the sound wave. And means for converting into at least two velocity signals representative of velocity.

[0024]

In the sound reproducing device according to the first aspect of the present invention, the sound pressure signal representing the sound pressure at the listening position at the time of sound collection and the directional component for the listener at the time of collecting the sound wave propagating medium are decomposed. At least two velocity signals representing the generated particle velocity are input, and the velocity vector at the listening position at the time of sound collection represented by the sound pressure signal and each velocity signal as the input signal and the velocity reproduced at the listening position at the time of reproduction Correct the sound pressure signal and each velocity signal which is the input signal by the first matrix circuit so that the vector does not change,
A high-frequency correction filter having a frequency characteristic that corrects the corrected sound pressure signal of the output signal from the first matrix circuit so that the gain above a predetermined frequency is larger than the gain below a predetermined frequency is passed. , A high-frequency correction filter having a frequency characteristic that corrects each corrected velocity signal of the output signal from the matrix circuit so that the gain above a predetermined frequency becomes smaller than the gain below a predetermined frequency. The linear combination means generates five signals corresponding to the respective reproduction speakers from the sound pressure signal and the respective speed signals which have been subjected to the high frequency correction in the first stage by the high frequency correction filter. The output signal of the linear combination means is subjected to the second stage high frequency correction by passing through a high frequency correction filter which adjusts the gain to a value determined by the speaker arrangement for reproducing the gain above a specific frequency. The high-frequency correction filters are all for reproducing sound based on human auditory characteristics. Since humans perceive the direction of arrival of sound, they perceive a sound image in the vertical direction of the incoming wavefront, that is, the direction of arrival of the velocity vector for low sounds, and perceive the direction of the energy vector of incoming sounds for high sounds. To do. The boundary of the perceptual range is determined by the distance between human ears,
The boundary is a frequency at which half the wavelength of the sound is equal to the distance between the ears, which corresponds to about 700 Hz. Therefore, the transition region of the low frequency characteristic and the high frequency characteristic of the high frequency correction filter is 100 to 10
It may be 00 Hz. The five signals that have been subjected to the second-stage high-frequency correction are reproduced by the corresponding five speakers, so that the left-angle speaker and the right-channel speaker have the opening angles of the rear left-channel speaker and the rear-right speaker. Even if the speakers are arranged at an equal distance from the listener even when the speaker arrangement is smaller than the opening angle of the channel speakers, the arrival direction angle of the speed vector at the time of sound collection and the arrival direction angle of the speed vector at the time of reproduction at the low range are also high. With, it is possible to reproduce an acoustically more accurate sound field at the time of sound collection, in which the arrival direction angles of the energy vector at the time of sound collection and the energy vector at the time of reproduction substantially match.

In the sound reproducing device according to the second aspect of the present invention, the sound pressure signal representing the sound pressure at the listening position at the time of collecting sound and the directional components for the listener at the time of collecting the sound wave propagating medium. At least two velocity signals representing the particle velocities decomposed into are input, and the input sound pressure signal and each velocity signal are separated by a filter means into a signal having a predetermined frequency or more and a signal having a predetermined frequency or less, respectively. A velocity vector correction matrix circuit so that the velocity vector at the listening position at the time of sound collection and the velocity vector reproduced at the listening position at the time of reproduction of the sound pressure signal and each velocity signal separated by the filter means to a predetermined frequency or less do not change. The sound pressure signal and the velocity signals separated by the filter means at a frequency higher than a predetermined frequency are corrected by the energy level at the listening position during sound collection. Torture and the energy vector reproduced at the listening position during reproduction are corrected by the energy vector correction matrix circuit, and the addition circuit adds the sound pressure signal and the speed signal, which are the output signals of the matrix circuits, respectively. A sound pressure signal and a velocity signal having the same bandwidth as the entire bandwidth at the time of sound collection are produced, and the output signal of the adding circuit is linearly combined into five signals by the linear combination means, and the five signals correspond to each other. It is played back by 5 speakers. According to the above processing, when the left-channel speaker and the right-channel speaker of the playback speakers have an opening angle smaller than that of the rear left-channel speaker and the rear right-channel speaker, the speakers are arranged at the same distance from the listener even in the speaker arrangement. In the low frequency range, the arrival angle of the velocity vector at the time of sound collection and the velocity vector of the sound vector at the time of reproduction are almost equal to each other. The sound field at the time of accurate sound collection can be reproduced in a wide band.

Further, in the sound reproducing apparatus according to the third aspect of the present invention, the sound pressure signal representing the sound pressure at the listening position at the time of sound collection and the directional components to the listener at the time of sound collection of the medium that propagates the sound wave. At least 2 representing the resolved particle velocity
At least two input signals consisting of a complex linear combination of two velocity signals are input, and the signal input from the input means is minimized by the second matrix circuit so as to minimize the square error between the original sound pressure signal and the velocity signal. Of the sound pressure signal and the velocity signal at the listening position at the time of sound collection represented by the sound pressure signal and each velocity signal, which are the output signals of the second matrix circuit, and the listening position at the time of reproduction. The sound pressure signal which is the input signal and each velocity signal are corrected by the first matrix circuit so that the velocity vector reproduced in Fig. 1 does not change, and the corrected sound of the output signal from the first matrix circuit is corrected. A high-frequency correction filter having a frequency characteristic that corrects the pressure signal so that the gain above a predetermined frequency is greater than the gain below a predetermined frequency. Of the output signal from the first matrix circuit, the high-frequency correction filter having a frequency characteristic that corrects each corrected velocity signal so that the gain above a predetermined frequency is smaller than the gain below a predetermined frequency. Pass through. The linear combination means generates five signals corresponding to the respective reproduction speakers from the sound pressure signal and the respective speed signals which have been subjected to the high frequency correction in the first stage by the high frequency correction filter. The output signal of the linear combination means is subjected to the second stage high frequency correction by passing through a high frequency correction filter which adjusts the gain to a value determined by the speaker arrangement for reproducing the gain above a specific frequency. The five signals that have been subjected to the second-stage high-frequency correction are reproduced by the corresponding five speakers, so that the left-angle speaker and the right-channel speaker have the opening angles of the rear left-channel speaker and the rear-right speaker. Even if the speakers are arranged at an equal distance from the listener even when the speaker arrangement is smaller than the opening angle of the channel speakers, the arrival direction angle of the speed vector at the time of sound collection and the arrival direction angle of the speed vector at the time of reproduction at the low range are also high. With, it is possible to reproduce an acoustically more accurate sound field at the time of sound collection, in which the arrival direction angles of the energy vector at the time of sound collection and the energy vector at the time of reproduction substantially match.

Further, in the sound reproducing apparatus according to the fourth aspect of the present invention, the sound pressure signal representing the sound pressure at the listening position at the time of sound collection and the directional components for the listener at the time of collecting the sound wave propagating medium. At least two input signals consisting of a complex linear combination of at least two velocity signals representing the particle velocities decomposed into are input, and the signals input from the input means are input by the matrix circuit to the original sound pressure signal and each velocity signal. The signal processing is performed so that the squared error between the velocity vector at the listening position at the time of sound collection represented and the velocity vector reproduced at the listening position at the time of reproduction is minimized, and the sound pressure signal among the output signals from the matrix circuit. Through a high-frequency correction filter having a frequency characteristic that corrects the gain above a predetermined frequency to be larger than the gain below a predetermined frequency. Gain above a predetermined frequency of each speed signal of the output signal from the helix circuit through the high-frequency correction filter having a frequency characteristic as to correct so as to be smaller than the gain below a predetermined frequency. The linear combination means corresponds to each reproduction speaker from the sound pressure signal and each speed signal which are subjected to the first-step high-frequency correction by the high-frequency correction filter.
Generate two signals. The output signal of the linear combination means is subjected to the second stage high frequency correction by passing through a high frequency correction filter which adjusts the gain to a value determined by the speaker arrangement for reproducing the gain above a specific frequency. The five signals that have been subjected to the second-stage high-frequency correction are reproduced by the corresponding five speakers, so that the left-angle speaker and the right-channel speaker have the opening angles of the rear left-channel speaker and the rear-right speaker. Even if the speakers are arranged at an equal distance from the listener even when the speaker arrangement is smaller than the opening angle of the channel speakers, the arrival direction angle of the speed vector at the time of sound collection and the arrival direction angle of the speed vector at the time of reproduction at the low range are also high. With, it is possible to reproduce an acoustically more accurate sound field at the time of sound collection, in which the arrival direction angles of the energy vector at the time of sound collection and the energy vector at the time of reproduction substantially match.

Further, in the sound reproducing apparatus according to the fifth aspect of the present invention, the sound pressure signal representing the sound pressure at the listening position at the time of sound collection and the directional components to the listener at the time of collecting the sound wave propagating medium. At least two input signals consisting of a complex linear combination of at least two velocity signals representing the particle velocities decomposed into are input, and a square error between the input signals and the original sound pressure signal and velocity signal is minimized by a matrix circuit. Such a sound pressure signal and a velocity signal are created, and the sound pressure signal and each velocity signal which is the output signal of the matrix circuit are separated by a filter means into a signal having a predetermined frequency or higher and a signal having a predetermined frequency or lower, respectively, and the filter means The sound pressure signal and each velocity signal separated by a predetermined frequency or less are reproduced by the velocity vector at the listening position during sound collection and the listening position during playback. The velocity vector is corrected by a velocity vector correction matrix circuit so that the velocity vector does not change, and the sound pressure signal and each velocity signal separated by the filter means to a predetermined frequency or more are energy vectors at the listening position at the time of sound collection and listening at the time of reproduction. The energy vector correction matrix circuit performs the first stage correction so that the energy vector reproduced at the position does not change, and the addition circuit adds the sound pressure signal and the speed signal, which are the output signals of the matrix circuits, respectively, and collects them. Produces a sound pressure signal and velocity signal with the same bandwidth as the entire bandwidth during sound,
The output signal of the adder circuit is linearly combined into five signals by a linear combination means, and the output signal of the linear combination means is adjusted by a filter means to a gain determined by a speaker arrangement for reproducing a gain of a specific frequency or higher. The output signal of the filter means is reproduced by the corresponding five speakers. According to the above processing, when the left-channel speaker and the right-channel speaker of the playback speakers have an opening angle smaller than that of the rear left-channel speaker and the rear right-channel speaker, the speakers are arranged at the same distance from the listener even in the speaker arrangement. In the low frequency range, the arrival angle of the velocity vector at the time of sound collection and the velocity vector of the sound vector at the time of reproduction are almost equal to each other. The sound field at the time of accurate sound collection can be reproduced in a wide band.

Further, in the sound reproducing apparatus according to the sixth aspect of the present invention, the audio signals of a plurality of channels in which the directions of the speakers to be reproduced as seen by the listener are determined are inputted and inputted from the input means. Based on the direction angle of the speaker that reproduces the sound signal, the sound pressure signal that represents the sound pressure at the listening position during reproduction and the particle velocity decomposed into each direction component for the listener when collecting the medium that propagates the sound wave are calculated. And a means for converting at least two speed signals to represent the reproduction speaker, and the speaker arrangement in the case where the opening angle of the left channel speaker and the right channel speaker of the reproduction speaker is smaller than the opening angle of the rear left channel speaker and the rear right channel speaker. When each speaker is equidistant from the listener, the speed at which the speakers are arranged in the low frequency range The arrival angle between the vector and the velocity vector at the time of reproduction is almost the same as the direction of arrival of the energy vector at the time of reproduction with the speaker arrangement that should be reproduced at high frequencies. The reproduced sound field can be reproduced with different speaker arrangements.

[0030]

【Example】

Example 1. FIG. 1 is a block diagram showing an audio reproducing apparatus according to a first embodiment of the present invention, in which 1 is an input terminal, 2 is a first sound pressure signal, 3 is a first longitudinal velocity signal, and 4 is a first speed signal. One horizontal velocity signal 5 is a first matrix circuit. Reference numerals 6, 7, and 8 denote a second sound pressure signal, a second longitudinal velocity signal, and a second lateral velocity signal, which are output signals of the first matrix circuit 5, respectively. 9
Is a first high band correction filter, 10 is a second high band correction filter, 11 is a third high band correction filter, and 12 is a regular pentagonal distribution matrix circuit. 13, 14, 15, 1
6 and 17 are regular pentagonal distribution matrix circuits 12 respectively.
Are left channel audio signals, center channel audio signals, right channel audio signals, rear left channel audio signals, and rear right channel audio signals. 18
Is a fourth high frequency correction filter for correcting the high frequency of the left channel audio signal 13, 23 is a first power amplifier for amplifying the output signal of the fourth high frequency correction filter 18,
28 is a left channel speaker driven by the first power amplifier 23. Reference numeral 19 is a fifth high-frequency correction filter that corrects the high frequency band of the center channel audio signal 14, 24 is a second power amplifier that amplifies the output signal of the fifth high-frequency correction filter 19, and 29 is a second power amplifier. A center channel speaker driven by a second power amplifier 24. Reference numeral 20 is a sixth high frequency correction filter for correcting the high frequency band of the right channel audio signal 15, 25 is a third power amplifier for amplifying the output signal of the sixth high frequency correction filter 20, and 30 is a third power amplifier. Three power amplifier 25
Is a right channel speaker driven by. Two
1 is a seventh high-frequency correction filter that corrects the high frequency of the rear left channel audio signal 16, 26 is a fourth power amplifier that amplifies the output signal of the seventh high-frequency correction filter 21, and 31 is It is a rear left channel speaker driven by a fourth power amplifier 26. 22 is an eighth high-frequency correction filter that corrects the high frequency of the rear right channel audio signal 17, 27 is a fifth power amplifier that amplifies the output signal of the eighth high-frequency correction filter 22, and 32 is The rear right channel speaker is driven by the fifth power amplifier 27.

Next, the operation will be described. The first sound pressure signal 2, the first longitudinal velocity signal 3, and the first lateral velocity signal 4 input to the input terminal 1 are input to the first matrix circuit 5.

In the first matrix circuit 5, the first longitudinal velocity signal 3 is multiplied so that the direction of the velocity vector reproduced at the listening position matches the direction of the velocity vector at the time of sound collection. After being multiplied by the coefficient, it is added to the adjusted first sound pressure signal 2 to obtain the second longitudinal velocity signal 7
become. The first left-right velocity signal 4 is multiplied by a multiplication coefficient so that the direction of the velocity vector reproduced at the listening position coincides with the direction of the velocity vector at the time of sound collection. Becomes Also, the first sound pressure signal 2
Is adjusted so that the difference between the magnitude of the velocity vector reproduced at the listening position and the magnitude of the velocity vector at the time of sound collection becomes the minimum value, and becomes the second sound pressure signal 6.

The second sound pressure signal 6, the second front-rear velocity signal 7, and the second left-right velocity signal 8 are respectively a first high-frequency correction filter 9, a second high-frequency correction filter 10, and a third high-frequency correction filter 10. The first-step high-frequency correction is performed so that the high-frequency correction filter 11 can reproduce so that the direction of the energy vector reproduced at the listening position matches the direction of the energy vector at the time of sound collection. The first high band correction filter 9, the second high band correction filter 10, and the third high band correction filter 11 all have the same gain in the low band, and the gain at a frequency higher than 1 kHz is the first high band correction. The filter 9 has a frequency characteristic that is larger than the low band, and the second high band correction filter 10 and the third high band correction filter 11 have frequency characteristics that are smaller than the low band gain.

The output signals of the first high-frequency correction filter 9, the second high-frequency correction filter 10 and the third high-frequency correction filter 11 are input to the regular pentagonal distribution matrix circuit 12 and the left channel audio signal 13 and the center channel are input. The audio signal 14, the right channel audio signal 15, the rear left channel audio signal 16, and the rear right channel audio signal 17 are distributed. This distribution method uses the listening position as the center of gravity, and one of the vertices of the output signal of the second high-frequency correction filter 10 in the direction of each vertex of a regular pentagon in front of the listener, and outputs the output signal of the second high-frequency correction filter 10 in the front-rear direction and the third height. Band correction filter 11
A vector whose output signal is the velocity component in the left-right direction is distributed, the signal of the first high-frequency correction filter 9 is added to each distributed vector component, and normalization is performed by the number of reproduced speakers, that is, in the first embodiment. Since the number of speakers is 5, it is to divide each addition result by the square root of 5.

The left channel audio signal 13, the center channel audio signal 14, the right channel audio signal 15, the rear left channel audio signal 16 and the rear right channel audio signal 17 are respectively a fourth high frequency correction filter 18 and a fifth high frequency band. Correction filter 19, sixth high-pass correction filter 20,
In order to reproduce so that the direction of the energy vector reproduced at the listening position by the seventh high-frequency correction filter 21 and the eighth high-frequency correction filter 22 matches the direction of the energy vector at the time of sound collection, High-frequency gain correction is performed.

The output signal of the fourth high frequency correction filter 18 is amplified by the first power amplifier 23 and reproduced by the left channel speaker 28. Fifth high-frequency correction filter 19
Output signal is amplified by the second power amplifier 24 and reproduced by the center channel speaker 29. The output signal of the sixth high frequency correction filter 20 is the third power amplifier 2
It is amplified by 5 and reproduced by the right channel speaker 30. The output signal of the seventh high frequency correction filter 21 is amplified by the fourth power amplifier 26 and reproduced by the rear left channel speaker 31. The output signal of the eighth high frequency correction filter 22 is amplified by the fifth power amplifier 27 and reproduced by the rear right channel speaker 32.

The effect of this sound reproducing device can be shown by calculation as in the case of the conventional example. Equation 4 shows a matrix for calculating the reproduction sound pressure of the sound reproduction device of the first embodiment.

[0038]

[Equation 4]

FIG. 2 shows the relationship between the direction angle of the energy vector during reproduction and the direction angle of the energy vector during sound collection based on the result of substituting the sound pressure obtained by the matrix calculation of the formula 4 into the formula 2. According to FIG. 2, the energy vector direction at the time of sound collection and the energy vector direction at the time of reproduction are substantially the same, and it can be seen that acoustically correct sound field reproduction is performed.

Example 2. FIG. 3 is a block diagram showing a sound reproducing device according to the second embodiment of the present invention. In the figure,
Reference numerals 33, 34 and 35 respectively denote a first sound pressure signal 2, a first front-rear direction speed signal 3, and a first left-right direction speed signal 4 for separating into a high band and a low band, and a second separation filter. A separation filter and a third separation filter. Reference numerals 36 and 37 respectively denote a first low frequency sound pressure signal and a first high frequency sound pressure signal which are output signals from the first separation filter 33. Three
Reference numerals 8 and 39 denote a first low-frequency front-rear direction speed signal and a first high-frequency front-rear direction speed signal which are output signals from the second separation filter 34, respectively. Reference numerals 40 and 41 denote a first low-frequency left-right velocity signal and a first high-frequency left-right velocity signal, which are output signals from the third separation filter 35. 42 is a velocity vector correction circuit that is a matrix circuit that corrects each low-frequency signal, and 43 is an energy vector correction circuit that is a matrix circuit that corrects each high-frequency signal. Four
Reference numerals 4, 46, and 48 are a second low-range sound pressure signal, a second low-range front-rear direction velocity signal, and a second low-range left-right direction signal which are output signals of the velocity vector correction circuit 42, respectively. Four
Reference numerals 5, 47 and 49 respectively represent a second high frequency sound pressure signal, a second high frequency front-back velocity signal, and a second high frequency left-right velocity signal which are output signals of the energy vector correction circuit 43. Reference numeral 50 is a first adder for adding the second low-range sound pressure signal 44 and second high-range sound pressure signal 45, and 51 is a second low-range front-rear direction velocity signal 46 and a second high-range front-rear. Direction speed signal 47
And 52 is a third adder for adding the second low-frequency left-right velocity signal 48 and the second high-frequency left-right velocity signal 49. 53 is a third sound pressure signal which is an output signal of the first adder 50, and 54 is a second adder 5
A third front-rear speed signal that is the output signal of 1 and a third left-right speed signal that is the output signal of the third adder 52. The other parts are similar to those of the first embodiment, and the description thereof is omitted.

Next, the operation will be described. The first sound pressure signal 2 input to the input terminal 1 is the first separation filter 33.
Is separated into a first low-range sound pressure signal 36 and a first high-range sound pressure signal 37. The frequency at the boundary of this separation is around 700 Hz. The first longitudinal velocity signal 3 input to the input terminal 1 is separated from the first low-frequency velocity signal 38 and the first low-frequency velocity signal 38 by the second separation filter 34 that separates the signal at the same frequency as the first separation filter 33. It is separated into one high-frequency front-back speed signal 39. The first left / right direction speed signal 4 is separated by the third separation filter 35, which separates the signal at the same frequency as the first separation filter 33, into a first low band left / right direction speed signal 40 and a first high band left / right direction speed signal. It is separated into 41.

The first low frequency sound pressure signal 36, the first low frequency front and rear direction speed signal 38 and the first low frequency left and right direction speed signal 40.
Is corrected so that the velocity vector input to the velocity vector correction circuit 42 at the listening position of the reproduced sound field matches the velocity vector of the collected sound field. One of the corrections is to add a multiplication coefficient to the first low-range sound pressure signal 36 so that the difference between the magnitude of the velocity vector of the reproduced sound field and the magnitude of the velocity vector of the collected sound field becomes small. The multiplication is to generate the second low frequency sound pressure signal 44. Another correction is to multiply the first low-frequency front-rear velocity signal 38 by a multiplication coefficient and then add the first low-frequency sound pressure signal 36 multiplied by the multiplication coefficient to obtain a second low-frequency front-rear velocity signal 46. Is generated and the first low-frequency left-right velocity signal 40 is multiplied by a multiplication coefficient to generate a second low-frequency left-right velocity signal 48, so that the direction of the velocity vector of the reproduced sound field is the velocity of the collected sound field. That is, it should match the direction of the vector.

A first high frequency sound pressure signal 37, a first high frequency front and rear direction speed signal 39 and a first high frequency left and right direction speed signal 41.
Is corrected so that the direction of the energy vector input to the energy vector correction circuit 43 at the listening position of the reproduced sound field matches the direction of the energy vector of the collected sound field. One of the corrections is the first high frequency sound pressure signal 37
Is multiplied by a multiplication coefficient such that the difference between the magnitude of the energy vector of the reproduced sound field and the magnitude of the energy vector of the collected sound field becomes as small as possible. Is to generate. Another correction is to multiply the first high-frequency front-back velocity signal 39 by a multiplication coefficient and then add the first high-frequency sound pressure signal 37 multiplied by the multiplication coefficient to obtain a second high-frequency front-back velocity signal 47. Is generated and the first high frequency left / right direction speed signal 41 is multiplied by a multiplication coefficient to generate a second high range left / right direction speed signal 49, so that the direction of the energy vector of the reproduced sound field is the energy of the collected sound field. That is, it should match the direction of the vector.

The second low-range sound pressure signal 44 and the second high-range sound pressure signal 45 are added by the first adder 50 to form the third sound pressure signal 53, which is the second low-range front-back velocity signal. 46 and the second high-frequency front-back direction speed signal 47 are added by the second adder 51 to become the third front-back direction speed signal 54, and the second low-frequency left-right speed signal 48 and the second high-frequency left-right direction. The speed signal 49 is added by the third adder 52 to become a third left-right direction speed signal 55.

The third sound pressure signal 53, the third longitudinal velocity signal 54, and the third lateral velocity signal 55 are input to the regular pentagonal distribution matrix circuit 12, and the left channel audio signal 13, the center channel audio signal 14, It is divided into five signals, that is, a right channel audio signal 15, a rear left channel audio signal 16, and a rear right channel audio signal 17.

The left channel audio signal 13 is amplified by the first power amplifier 23 and reproduced by the left channel speaker 28. The center channel audio signal 14 is amplified by the second power amplifier 24 and reproduced by the center channel speaker 29. The right channel audio signal 15 is amplified by the third power amplifier 25 and reproduced by the right channel speaker 30. Rear left channel audio signal 1
6 is amplified by the fourth power amplifier 26 and reproduced by the rear left channel speaker 31. The rear right channel audio signal 17 is amplified by the fifth power amplifier 27 and reproduced by the rear right channel speaker 32.

Example 3. FIG. 4 is a block diagram showing a sound reproducing device according to a third embodiment of the present invention.
An input signal 56 is a complex linear combination of a sound pressure signal representing the sound pressure at the listening position during sound collection and at least two velocity signals representing particle velocities decomposed into directional components for the listener during sound collection. L signal, 57 is a complex linear combination of a sound pressure signal representing the sound pressure at the listening position at the time of sound collection and at least two velocity signals representing the particle velocity decomposed into each direction component for the listener at the time of sound collection. R signal which is an input signal. 58 is an L signal 56 and an R signal 5
7 is a second matrix circuit for generating a first sound pressure signal 2, a first longitudinal velocity signal 3 and a first lateral velocity signal 4. The other parts are similar to those of the first embodiment, and the description thereof is omitted.

Next, the operation will be described. The L signal 56 input to the input terminal 1 includes a sound pressure signal representing the sound pressure at the listening position at the time of sound collection and at least two velocity signals representing the particle velocity decomposed into each direction component for the listener at the time of sound collection. The R signal 57 is a signal composed of a complex linear combination, and the R signal 57 is a sound pressure signal representing the sound pressure at the listening position at the time of sound collection and at least two velocities representing the particle velocities decomposed into directional components for the listener at the time of sound collection A signal that is a complex linear combination of signals. The L signal 56 and the R signal 57 are input to the second matrix circuit 58.

In the second matrix circuit 58, the L signal 5
6 and the first sound pressure signal 2 having a smaller difference from the original sound pressure signal than the R signal 57, and the front-back direction in which the direction difference between the speed vector indicated by the composite signal of the plurality of original speed signals becomes small. A first front-rear component speed signal 3 having a velocity component and a first left-right velocity signal 4 having a left-right velocity component such that the direction difference between the velocity vectors is reduced are generated. Subsequent operations are the same as those in the first embodiment, and the description thereof will be omitted.

Example 4. FIG. 5 is a block diagram showing a sound reproducing device according to a fourth embodiment of the present invention.
Reference numeral 59 is a third matrix circuit for generating the second sound pressure signal 6, the second longitudinal velocity signal 7 and the second lateral velocity signal 8 from the L signal 56 and the R signal 57. The other parts are similar to those of the third embodiment, and the description thereof is omitted.

Next, the operation will be described. The L signal 56 input to the input terminal 1 includes a sound pressure signal representing the sound pressure at the listening position at the time of sound collection and at least two velocity signals representing the particle velocity decomposed into each direction component for the listener at the time of sound collection. The R signal 57 is a signal composed of a complex linear combination, and the R signal 57 is a sound pressure signal representing the sound pressure at the listening position at the time of sound collection and at least two velocities representing the particle velocities decomposed into directional components for the listener at the time of sound collection. A signal that is a complex linear combination of signals. The L signal 56 and the R signal 57 are input to the third matrix circuit 59.

The third matrix circuit 59 has the same effect as that of the second matrix circuit 58 and the first matrix circuit 5 in which two matrix circuits are arranged in series in the third embodiment. The second matrix circuit 58 is represented by matrix elements of 3 rows and 3 columns, and the first matrix circuit 5 is also a circuit represented by matrix elements of 3 rows and 3 columns. The matrix circuit 58 and the matrix of the first matrix circuit 5 result in a circuit represented by a matrix. Therefore, the output signals of the third matrix circuit 59 are the second sound pressure signal 6, the second longitudinal velocity signal 7 and the second lateral velocity signal 8. Since the operation thereafter is the same as that of the first embodiment, the description thereof will be omitted.

Example 5. FIG. 6 is a block diagram showing a sound reproducing device according to a fifth embodiment of the present invention.
Reference numeral 60 is a ninth high-frequency correction filter that corrects the high-frequency gain of the left channel audio signal 13, 61 is a tenth high-frequency correction filter that corrects the high-frequency gain of the center channel audio signal 14, and 62 is a high-frequency correction filter. Right channel audio signal 15
Is a twelfth high-frequency correction filter that corrects the high-frequency gain of the rear left channel audio signal 16, and 63 is a rear right-channel audio signal. A thirteenth high-frequency correction filter for correcting the high-frequency gain of the signal 17. The other parts are similar to those of the first embodiment, and the description thereof is omitted.

Next, the operation will be described. The L signal 56 input to the input terminal 1 includes a sound pressure signal representing the sound pressure at the listening position at the time of sound collection and at least two velocity signals representing the particle velocity decomposed into each direction component for the listener at the time of sound collection. The R signal 57 is a signal composed of a complex linear combination, and the R signal 57 is a sound pressure signal representing the sound pressure at the listening position at the time of sound collection and at least two velocities representing the particle velocities decomposed into directional components for the listener at the time of sound collection. A signal that is a complex linear combination of signals. The L signal 56 and the R signal 57 are input to the second matrix circuit 58.

In the second matrix circuit 58, the L signal 5
6 and the first sound pressure signal 2 having a smaller difference from the original sound pressure signal than the R signal 57, and the front-back direction in which the direction difference between the speed vector indicated by the composite signal of the plurality of original speed signals becomes small. A first front-rear component speed signal 3 having a velocity component and a first left-right velocity signal 4 having a left-right velocity component such that the direction difference between the velocity vectors is reduced are generated.

The first sound pressure signal 2 is the first separation filter 3
3 separates into a first low frequency sound pressure signal 36 and a first high frequency sound pressure signal 37. The frequency at the boundary of this separation is around 700 Hz. The first longitudinal velocity signal 3 input to the input terminal 1 is separated from the first low-frequency velocity signal 38 and the first low-frequency velocity signal 38 by the second separation filter 34 that separates the signal at the same frequency as the first separation filter 33. It is separated into one high-frequency front-back speed signal 39. The first left / right direction speed signal 4 is separated by the third separation filter 35, which separates the signal at the same frequency as the first separation filter 33, into a first low band left / right direction speed signal 40 and a first high band left / right direction speed signal. It is separated into 41.

The first low frequency sound pressure signal 36, the first low frequency front and rear direction speed signal 38 and the first low frequency left and right direction speed signal 40.
Is corrected so that the velocity vector input to the velocity vector correction circuit 42 at the listening position of the reproduced sound field matches the velocity vector of the collected sound field. One of the corrections is to add a multiplication coefficient to the first low-range sound pressure signal 36 so that the difference between the magnitude of the velocity vector of the reproduced sound field and the magnitude of the velocity vector of the collected sound field becomes small. The multiplication is to generate the second low frequency sound pressure signal 44. Another correction is to multiply the first low-frequency front-rear velocity signal 38 by a multiplication coefficient and then add the first low-frequency sound pressure signal 36 multiplied by the multiplication coefficient to obtain a second low-frequency front-rear velocity signal 46. Is generated and the first low-frequency left-right velocity signal 40 is multiplied by a multiplication coefficient to generate a second low-frequency left-right velocity signal 48, so that the direction of the velocity vector of the reproduced sound field is the velocity of the collected sound field. That is, it should match the direction of the vector.

The first high frequency sound pressure signal 37, the first high frequency front and rear direction speed signal 39 and the first high frequency left and right direction speed signal 41.
Is corrected so that the direction of the energy vector input to the energy vector correction circuit 43 at the listening position of the reproduced sound field matches the direction of the energy vector of the collected sound field. One of the corrections is the first high frequency sound pressure signal 37
Is multiplied by a multiplication coefficient such that the difference between the magnitude of the energy vector of the reproduced sound field and the magnitude of the energy vector of the collected sound field becomes as small as possible. Is to generate. Another correction is to multiply the first high-frequency front-back velocity signal 39 by a multiplication coefficient and then add the first high-frequency sound pressure signal 37 multiplied by the multiplication coefficient to obtain a second high-frequency front-back velocity signal 47. Is generated and the first high frequency left / right direction speed signal 41 is multiplied by a multiplication coefficient to generate a second high range left / right direction speed signal 49, so that the direction of the energy vector of the reproduced sound field is the energy of the collected sound field. That is, it should match the direction of the vector.

The second low-range sound pressure signal 44 and the second high-range sound pressure signal 45 are added by the first adder 50 to become the third sound pressure signal 53, which is the second low-range longitudinal velocity signal. 46 and the second high-frequency front-back direction speed signal 47 are added by the second adder 51 to become the third front-back direction speed signal 54, and the second low-frequency left-right speed signal 48 and the second high-frequency left-right direction. The speed signal 49 is added by the third adder 52 to become a third left-right direction speed signal 55.

The third sound pressure signal 53, the third longitudinal velocity signal 54 and the third lateral velocity signal 55 are input to the regular pentagonal distribution matrix circuit 12 and the left channel audio signal 13, the center channel audio signal 14, It is divided into five signals, that is, a right channel audio signal 15, a rear left channel audio signal 16, and a rear right channel audio signal 17.

The left channel audio signal 13, the center channel audio signal 14, the right channel audio signal 15, the rear left channel audio signal 16 and the rear right channel audio signal 17 are respectively a ninth high frequency correction filter 60 and a tenth high frequency band. Correction filter 61, eleventh high frequency correction filter 6
2, so that the direction of the energy vector reproduced at the listening position by the twelfth high-frequency correction filter 63 and the thirteenth high-frequency correction filter 64 can be reproduced so as to match the direction of the energy vector at the time of sound collection. The second-stage high-frequency gain correction is performed.

The output signal of the ninth high frequency correction filter 60 is amplified by the first power amplifier 23 and reproduced by the left channel speaker 28. Tenth high frequency correction filter 61
Output signal is amplified by the second power amplifier 24 and reproduced by the center channel speaker 29. The output signal of the eleventh high frequency correction filter 62 is amplified by the third power amplifier 25 and reproduced by the right channel speaker 30. The output signal of the twelfth high frequency correction filter 63 is amplified by the fourth power amplifier 26 and reproduced by the rear left channel speaker 31. Thirteenth high frequency correction filter 6
The output signal 4 is amplified by the fifth power amplifier 27 and reproduced by the rear right channel speaker 32.

Example 6. FIG. 7 is a block diagram showing an audio reproducing device according to a sixth embodiment of the present invention.
Reference numerals 65, 66, 67, and 68 denote a left channel signal, a center channel signal, a right channel signal, and a rear channel signal, which are inputs, respectively. 69 inputs the left channel signal 65, the center channel signal 66, the right channel signal 67, and the rear channel signal 68, and inputs the second sound pressure signal 6, the second front-rear direction speed signal 7, and the second left-right direction speed signal 8. Is a sound pressure velocity signal generator. The other parts are similar to those of the first embodiment, and the description thereof is omitted.

Next, the operation will be described. The left channel signal 65, the center channel signal 66, the right channel signal 67, and the rear channel signal 68 input from the input terminal 1 are signals to be reproduced from the speakers whose speaker arrangement is determined by the listener. Left channel signal 6 input to the sound pressure velocity signal generator 69
5, center channel signal 66, right channel signal 6
7 and the rear channel signal 68 are all added to generate the second sound pressure signal 6. The left channel signal 65, the center channel signal 66, the right channel signal 67, and the rear channel signal 68 input to the sound pressure velocity signal generator 69 are all in the direction of the speaker from which the respective signals viewed by the listener should be reproduced. Is a directional component, and the front-back direction component when the sound pressure at the listening position is replaced with a vector is added to generate a second front-back direction velocity signal 7, and the left-right direction component of the vector is added. Then, a second horizontal velocity signal 8 is generated. The subsequent operation is the same as that of the first embodiment, and will be omitted.

[0065]

As described above, according to the sound reproducing apparatus of the first aspect of the present invention, when the sound field collecting signal including the sound pressure signal and the plurality of velocity signals is reproduced, the reproduced sound is reproduced. Since the circuit that adjusts the energy vector of the high frequency component at the listening position in the field can be controlled individually for each reproduction speaker, the direction of the low frequency vector and the high frequency energy vector match in any speaker arrangement. This has the effect of reproducing a sound field that is acoustically correct.

Further, according to the sound reproducing device of the second aspect of the present invention, in addition to the effect of the sound reproducing device of the first aspect, the directions of the low-frequency velocity vector and the high-frequency energy vector coincide with each other. This has the effect of increasing the frequency range.

Further, according to the sound reproducing apparatus of the third aspect of the present invention, in reproducing an audio signal composed of a complex linear combination of a sound pressure signal and a plurality of velocity signals, the listening position of the reproduced sound field. Since the circuit that adjusts the energy vector of the high frequency component in can be controlled individually for each playback speaker, the direction of the low frequency vector and the high frequency energy vector are the same in any speaker arrangement. It has the effect of reproducing the correct sound field.

Further, according to the sound reproducing apparatus of the fourth aspect of the present invention, in addition to the effect of the sound reproducing apparatus of the third aspect, there is an effect of reducing the circuit scale to be configured.

Further, according to the sound reproducing apparatus of the fifth aspect of the present invention, in reproducing an audio signal composed of a complex linear combination of a sound pressure signal and a plurality of velocity signals, the listening position of the reproduced sound field. Since the circuit that adjusts the energy vector of the high frequency component in can be controlled individually for each playback speaker, the direction of the low frequency vector and the high frequency energy vector are the same in any speaker arrangement. It has the effect of reproducing the correct sound field, and further,
This has the effect of increasing the frequency range in which the directions of the low-range velocity vector and the high-range energy vector coincide.

According to the sixth aspect of the sound reproducing apparatus of the present invention, a sound pressure signal and a velocity signal are generated for a plurality of audio signals whose speaker arrangement to be reproduced is fixed, and each reproduction speaker is reproduced. Since the sound is played back from the speaker after the hearing correction is performed individually, the effect that the direction of the low-frequency velocity vector and the high-frequency energy vector match can be reproduced auditorily correct sound field in any speaker arrangement. There is.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a sound reproducing device according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a calculation result of a reproduction energy vector of the sound reproduction device according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a sound reproducing device according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing an audio reproducing device according to a third embodiment of the invention.

FIG. 5 is a block diagram showing an audio reproducing device according to a fourth embodiment of the invention.

FIG. 6 is a block diagram showing an audio reproducing device according to a fifth embodiment of the invention.

FIG. 7 is a block diagram showing an audio reproducing device according to a sixth embodiment of the present invention.

[Fig. 8] Fig. 8 is a speaker arrangement diagram during high-definition audio 3-1 system reproduction.

FIG. 9 is a block diagram showing a basic configuration of a conventional sound reproducing device.

FIG. 10 is a calculation result of a reproduction energy vector of a conventional sound reproduction device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 input terminal, 2 1st sound pressure signal, 3 1st front-back direction speed signal, 4 1st left-right direction speed signal, 5 1st matrix circuit, 6 2nd sound pressure signal, 7 2nd front-back Direction speed signal, 8 2nd left-right direction speed signal, 9 1st high frequency correction filter, 10 2nd high frequency correction filter,
11 third high-pass correction filter, 12 regular pentagonal distribution matrix circuit, 13 left channel audio signal, 14 center channel audio signal, 15 right channel audio signal, 16 rear left channel audio signal, 17 rear right channel audio signal, 18th Four high frequency correction filters, 1
9 Fifth high frequency correction filter, 20 Sixth high frequency correction filter, 21 Seventh high frequency correction filter, 22 Eighth high frequency correction filter, 23 First power amplifier, 24
Second power amplifier, 25 Third power amplifier, 26
4th power amplifier, 27 5th power amplifier, 2
8 Left channel speaker, 29 Center channel speaker, 30 Right channel speaker, 31 Rear left channel speaker, 32 Rear right channel speaker, 33 First separation filter, 34 Second separation filter, 35 Third separation filter, 36th One low-range sound pressure signal, 37 First high-range sound pressure signal, 38 First low-range front-rear direction speed signal, 39 First high-range front-rear direction speed signal, 40 First low-range left-right direction speed signal , 41 first high frequency left / right velocity signal, 42 velocity vector correction circuit,
43 energy vector correction circuit, 44 second low range sound pressure signal, 45 second high range sound pressure signal, 46 second low range front-rear direction speed signal, 47 second high range front-rear direction speed signal, 48th 2nd low-pass left-right velocity signal, 49 2nd high-pass left-right velocity signal, 50 1st adder, 51 2nd adder, 52 3rd adder, 53 3rd sound pressure signal, 54 Third longitudinal velocity signal, 55 Third lateral velocity signal, 56 L signal, 57R signal, 58 Second matrix circuit, 59 Third matrix circuit, 6
0 9th high-frequency correction filter, 61 10th high-frequency correction filter, 62 11th high-frequency correction filter, 63 12th high-frequency correction filter 64 13th high-frequency correction filter 65 Left channel signal , 66 center channel signal, 67 right channel signal, 68 rear channel signal, 69 sound pressure velocity signal generator, 70 listener.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display H04S 7/00 F

Claims (6)

[Claims] 1. A sound pressure signal representing sound pressure at a listening position during sound collection and at least two velocity signals representing particle velocities decomposed into respective direction components for a listener at the time of sound collection of a medium that propagates sound waves. Inputting means for inputting, and inputting to the inputting means so that the velocity vector at the listening position during sound collection represented by the signal input from the inputting means and the velocity vector reproduced at the listening position during reproduction do not change A first matrix circuit that corrects each of the corrected signals, and a corrected sound pressure signal of the output signals from the first matrix circuit so that the gain of a predetermined frequency or more becomes greater than the gain of a predetermined frequency or less. A filter means having a frequency characteristic to be corrected, and a corrected speed signal of the output signal from the first matrix circuit is gained at a predetermined frequency with a gain of a predetermined frequency or more. Filter means having a frequency characteristic such that it is corrected so as to be smaller than the gain below the wave number,
A linear combination means for outputting five signals by linear combination of the output signals of the respective filter means, and a filter means for adjusting the gain of the output signal of the linear combination means to a gain determined by a speaker arrangement for reproducing. And an amplifier for amplifying the output signal of the filter means, and a speaker driven by the output of the amplifier. 2. A sound pressure signal representing sound pressure at a listening position during sound collection and at least two velocity signals representing particle velocities decomposed into respective directional components for a listener at the time of sound collection of a medium that propagates sound waves. Input means for inputting, filter means for separating a signal input from the input means into a signal of a predetermined frequency or higher and a signal of a predetermined frequency or lower, respectively, and a sound pressure signal separated by the filter means to a predetermined frequency or lower. A velocity vector correction matrix circuit that corrects each signal input to the input means so that the velocity vector at the listening position when collecting the velocity signal and the velocity vector reproduced at the listening position during reproduction do not change; Energy vector at the listening position at the time of collecting the sound pressure signal and each velocity signal separated by the filter means to a predetermined frequency or higher and the listening position at the time of reproducing An energy vector correction matrix circuit that corrects each signal input to the input means so that the energy vector reproduced in FIG.
Adding means for adding the sound pressure signal and the speed signal, which are the output signals from the two matrix circuits, respectively, to generate a sound pressure signal and a speed signal having the same bandwidth as the total bandwidth at the time of collecting sound; A sound reproducing device comprising: a linear combination means for outputting five signals by linear combination of output signals; an amplifier for amplifying the output signal of the linear combination means; and a speaker driven by the output of the amplifier. . 3. A sound pressure signal representing sound pressure at a listening position during sound collection and at least two velocity signals representing particle velocities decomposed into respective directional components for a listener at the time of sound collection of a medium propagating a sound wave. Input means for inputting at least two input signals consisting of a complex linear combination, and a sound pressure signal and a speed signal such that a square error between the input sound signal and the original sound pressure signal and the speed signal is minimized. A second matrix circuit for performing signal processing for creating a signal, a velocity vector at a listening position at the time of sound collection and a velocity vector reproduced at a listening position at the time of reproduction, which are represented by an output signal from the second matrix circuit. A first matrix circuit that corrects each signal input to the input means so as not to change, and a corrected sound of an output signal from the first matrix circuit. Filter means having a frequency characteristic for correcting the pressure signal so that the gain above the predetermined frequency is larger than the gain below the predetermined frequency, and each corrected speed signal among the output signals from the first matrix circuit. Filter means having frequency characteristics for correcting the gain above a predetermined frequency to be smaller than the gain below a predetermined frequency, and a linear combination means for outputting five signals by linear combination of the output signals of the filter means. A filter means for adjusting the gain of the output signal of the linear combination means above a specific frequency to a gain determined by a speaker arrangement, an amplifier for amplifying the output signal of the filter means, and an output of the amplifier. A sound reproducing device having a speaker. 4. A sound pressure signal representing sound pressure at a listening position during sound collection and at least two velocity signals representing particle velocities decomposed into respective directional components for a listener at the time of sound collection of a medium propagating a sound wave. Input means for inputting at least two input signals composed of complex linear combinations, velocity vector at a listening position at the time of sound collection represented by the original sound pressure signal and velocity signal from the signals input from the input means, and at the time of reproduction A matrix circuit for processing each signal input to the input means so that the squared error from the velocity vector reproduced at the listening position is minimized, and a corrected sound pressure signal among the output signals from the matrix circuit. Filter means having a frequency characteristic for correcting the gain above a predetermined frequency to be larger than the gain below a predetermined frequency; Filter means having a frequency characteristic for correcting each corrected velocity signal among the output signals so that the gain above a predetermined frequency is smaller than the gain below a predetermined frequency, and the output signal of the filter means is linear. The linear combination means for outputting five signals by combination, the filter means for adjusting the gain of the output signal of the linear combination means above a specific frequency to the gain determined by the speaker arrangement, and the output signal of the filter means A sound reproducing device comprising: an amplifier for amplifying; and a speaker driven by an output of the amplifier. 5. A sound pressure signal representing sound pressure at a listening position during sound collection and at least two velocity signals representing particle velocities decomposed into respective directional components for a listener at the time of sound collection of a medium that propagates sound waves. Input means for inputting at least two input signals consisting of a complex linear combination, and a sound pressure signal and a speed signal such that a square error between the input sound signal and the original sound pressure signal and the speed signal is minimized. A matrix circuit for performing signal processing, a filter means for separating an output signal of the matrix circuit into a signal having a predetermined frequency or higher and a signal having a predetermined frequency or lower, and a sound pressure signal separated by the filter means to a predetermined frequency or lower. And inputting each velocity signal so that the velocity vector at the listening position at the time of sound collection and the velocity vector reproduced at the listening position at the time of reproduction do not change. A velocity vector correction matrix circuit for correcting each signal input to the means, a sound pressure signal separated by the filter means to a frequency higher than a predetermined frequency, and each velocity signal, an energy vector at a listening position at the time of collecting sound and a listening at the time of reproducing. An energy vector correction matrix circuit for performing first-stage correction of each signal input to the input means so that the energy vector reproduced at the position does not change, and each corrected output signal from each matrix circuit. An adder for adding a sound pressure signal and each speed signal to produce a sound pressure signal and a speed signal having the same bandwidth as the total bandwidth at the time of sound collection, and five signals by linearly combining the output signals of the adder Is determined by the linear combination means for outputting and the speaker arrangement for reproducing the gain of the output signal of the linear combination means above a specific frequency. Sound having a filter unit for adjusting the gain of the energy vector to perform the second stage correction of the energy vector direction angle, an amplifier for amplifying the output signal of the filter unit, and a speaker driven by the output of the amplifier. Playback device. 6. An input means for inputting audio signals of a plurality of channels in which directions of speakers to be reproduced as viewed from a listener are input, and a speaker direction angle for reproducing the audio signals input by the input means. And a means for converting the sound pressure signal representing the sound pressure at the listening position during reproduction into at least two velocity signals representing the particle velocity decomposed into each direction component for the listener at the time of collecting the sound wave propagating medium. The sound reproducing device according to claim 1 or 2, further comprising: