JPH04176300A - Asymmetrical sound field correcting device - Google Patents

Abstract

PURPOSE:To form a symmetrical and widespread sound field at a hearing position by outputting a crosstalk signal where either level or phase of the basic sound or effective sound of each channel on the right and left is corrected and a crosstalk adjustment signal where either level is corrected respectively to right-and-left speakers or to a center speaker. CONSTITUTION:A center speaker is provided near the center of the left and right speakers. The acoustic signal of the basic sound of the stereo acoustic signal from a acoustic signal source and the acoustic signal of the effective sound such as the initial reflection sound and reverberation sound are supplied to the respective right and left speakers. On the other hand, at least either of phase or level of the acoustic signal of the basic sound and the effective sound of the right and left channels is respectively corrected and added in a crosstalk signal preparation means to be supplied to a center speaker as a crosstalk signal. At least either level of the acoustic signals of the basic sound and the effective sound of right and left channels is corrected, and the added and prepared crosstalk adjustment signal is supplied to the center speaker in the crosstalk adjustment means.

Description

[Detailed Description of the Invention] Overview When correcting an asymmetrical sound field at a listening position where the direction angle of the left speaker and the direction angle of the right speaker are different, such as in the cabin of an automobile, the acoustic signal source A stereo sound signal of the basic sound from the left and a sound signal of a sound effect such as '/S reverberation sound created by calculating the sound signal are outputted to each of the left and right speakers, respectively. and correcting at least one of the level and phase of the fundamental sound and sound effect acoustic signals of each right channel to create a slanted crossstoke signal that forms a symmetrical sound field at the listening position; The signal is output to the right and left speakers, or to a center speaker placed near the center of the left and right speakers.

Further, a signal obtained by correcting the level of at least one of the basic sound acoustic signal and the sound effect acoustic signal of each of the left and right channels is transmitted to the right and left speakers, or Output to the center speaker.

As a result, a symmetrical sound field with a sound image localized in the front direction is formed at the listening position, and the spread angle of the sound field can be easily adjusted by adjusting the level of the crosstalk adjustment signal. do.

Industrial Application Field The present invention relates to an asymmetric sound field that corrects the asymmetry of the sound field that occurs when a stereo sound signal is reproduced by speakers that are arranged asymmetrically from the listening position, such as in the cabin of an automobile. The present invention relates to a correction device.

BACKGROUND OF THE INVENTION Various methods have been proposed for correcting the asymmetry of the sound field caused by the difference in distance from the listening position to the left and right channel speakers, especially for in-vehicle sound reproduction devices. There is. For example, the phase and level of the right-channel audio signal may be adjusted and presented to the right-channel speaker, and the phase and level of the right-channel audio signal may be similarly adjusted and presented to the right-channel speaker to give a listener's impression. One method is to shift the direction of the sound source to the outside of the left and right channel speakers, creating a symmetrical sound field at the actual listening position.

Generally, the propagation speed of sound differs depending on its frequency. Furthermore, the propagation characteristics vary greatly depending on the frequency, as is particularly noticeable in the interior of a vehicle. Therefore, in adjusting the phase and level, it is necessary to divide the acoustic signal into a plurality of bands and set the amount of change in the phase and level for each band.

Problem to be Solved by the Invention However, in conventional sound reproducing devices, the amount of each of the above-mentioned variables 1 is configured to be changed individually so as to correspond to the spread angle of the sound field desired by the listener. has been done. However, in the past, it required extremely complicated operations, and especially in car-mounted sound equipment, there was a problem in that it interfered with driving operations.

Furthermore, in recent years, sound effects such as early reflections and reverberations have been added to acoustic signals from magnetic tape playback devices and radio receivers to provide realistic sound reproduction. or has been proposed. Therefore, such a configuration:
Further complicated operations are required to adjust the spread angle of the sound field.

An object of the present invention is to provide an asymmetric sound field correction device that can form a desired bilaterally symmetrical sound field with simple operation.

Means for Solving the Problems The present invention comprises: left and right speakers disposed in front left and right front of a listening position at positions forming mutually different directional angles; and near the center of the left and right speakers. , and a center speaker disposed at a position with a directional angle larger than one of the left and right speakers and smaller than the other, outputting an acoustic signal of the fundamental sound of the left speaker I\right channel, and outputting an acoustic signal of the fundamental sound of the left speaker I\right channel, A sound signal source that outputs the sound signal of the fundamental sound of the channel, and the sound signal of the fundamental sound of both the left and right channels from the sound signal source are processed to create the sound effect sound signal of the left and right pot channels, Sound effect generating means outputs to the left and right speakers, respectively, and corrects and adds at least one of the phase and phase of the basic sound and sound effect acoustic signals of both the left and right channels, and generates a tallest signal. a crosstalk signal generating means outputted to the center speaker as a crosstalk signal, and correcting and adding the level of at least one of the left and right chai ruka basic sound acoustic signals and the sound effect sound signal, and adjusting the crosstalk. The center speaker I as a signal
This is an asymmetrical sound field correction device characterized by including a cross 1 output and a 1 stage adjustment.

The present invention also provides: left and right speakers arranged at positions having mutually different direction angles in front left and right front of a listening position; outputting an acoustic signal of a left 1-Yanel fundamental sound to the left speaker; An acoustic signal source outputs the fundamental tone acoustic signal of the right channel to the right speaker, and the acoustic signal of the fundamental tone of the left and right channels from the acoustic signal source is processed to create the acoustic signal of the sound effect of the left and right pot channels. and the sound effects output to the left and right speakers, respectively, are corrected and at least one of the levels and phases of the acoustic signals of the fundamental sound and the sound effect of the left and right channels are corrected and listened to. Create a slanted cross I signal that forms a symmetrical sound field at the position, and output one signal from each of the right and left speakers f\)~-
a signal generating means for correcting the error of at least one of the fundamental sound acoustic signal and the sound effect acoustic signal of each left and right channel, and outputting the signal to the right and left speakers as a crosstalk adjustment signal; This is an asymmetric sound field correction device characterized in that it includes cross 1 and cross adjustment means that respectively output signals to 1 and 1.

According to the present invention, when the left speaker and the right speaker that reproduce stereo sound are different in direction angle from the listening position, as in the interior of a car, the left speaker and the stereo speaker are different from each other. A center speaker is installed in the center position mortar + 3 loaves.

The left and right speakers I\ are each provided with a stereo sound signal from an audio signal source or an acoustic standard of a fundamental sound. In addition, to each of the left and right speakers of the MIF, an acoustic signal of a sound effect such as an early reflection sound or a reverberation sound created by a sound effect creation means is provided based on the acoustic signal of the basic sound. .

On the other hand, the basic sound and sound effect sound signals of the left and right channels are corrected in phase and/or level at least one of them and added together in the cross signal generation means, and then added. - is given to the senku beaker as a check signal.

Further, a cross-I signal is output to the center speaker by correcting the level of at least one of the basic sound sound signal and the sound effect sound signal of the left and right channels in the crosstalk adjustment means, and adding them together. A so-called review has been given.

Further, according to the present invention, the left and right speakers are respectively provided with a stereo sound # signal or a fundamental sound sound signal from the sound signal source. Further, each of the left and right speakers is provided with an acoustic signal of a sound effect produced by a sound effect generating means based on the acoustic signal of the basic sound.

On the other hand, the sound signals of the fundamental sound and sound effects of the right channel are
In the crosstalk signal generating means, at least one of the level and phase of the crosstalk signal is corrected, and then the crosstalk signal is applied to the right speaker as a crosstalk signal.

Similarly, the right channel acoustic signal is corrected for its level and/or phase, and then
- being given to the left speaker as a single signal;

A crosstalk adjustment signal created by correcting the level of the basic sound and sound effects of the right channel and at least one of the sound signals is also sent to the above-mentioned speakers from the adjustment means. is given. Similarly, the left speaker I\ also controls whether the fundamental sound and/or sound effects of the right channel raise the level of one of the acoustic signals h.
1j correct (constructed cross 1-1 adjustment signal is given.

In the past, by adjusting the level correction amount applied to the crosstalk adjustment means, the sound of the fundamental sound J3 and the effect sound, which was formed at a large spread angle by the cross1 to cross signals, can be adjusted. The field becomes smaller in accordance with the level correction amount.

In this way, even if the cross 1 - 1 signal is created for each of a plurality of frequency bands in accordance with the acoustic characteristics of the acoustic space in which each of the speakers is arranged, the cross 1 - 1 signal is created for each of a plurality of frequency bands.
The cross 1-
To make it possible to adjust the spread angle of a sound field of a basic sound and an effect sound by a simple operation of simply adjusting the level correction amount in an adjustment means.

Embodiment FIG. 1 is a block diagram showing the electrical configuration of a vehicle-mounted sound reproduction device 1 according to an embodiment of the present invention. The instrument I panel 5 located in front of the driver's seat 3 and passenger seat 4 in the vehicle cabin 2, which is an acoustic space, includes:
Speakers SL, SC.

SR is provided. That is, a speaker SL- is provided on the left side of the driver's seat 3 and the passenger seat 4, a speaker SR is provided on the right side, and a center speaker SC is provided near the center.

Acoustic signal source 1 such as a magnetic tape playback device or radio receiver
1, an acoustic signal of the fundamental tone of the right channel is derived from line 12, and an acoustic signal of the fundamental tone of the right channel is derived from line 13. These two acoustic signals are input to a sound field control device 1/] which is a sound effect generating means.

The sound field control device 14 includes a direct sound adjustment circuit 15, an early reflected sound creation circuit 6, and a reverberation sound creation circuit 17. The sound signal from the sound signal source 11 is adjusted by the direct sound adjustment circuit 5 in terms of left-right balance, etc., and then sent to the adders KL and K as a direct sound sound signal, which is the fundamental sound.
Output to R.

Further, based on the acoustic signal from the acoustic signal source 11, the early reflection sound generation circuit 16 delays and attenuates the direct sound for a time corresponding to the sound field to be reproduced, such as a concert pole. , creates acoustic signals of early reflected sounds for the left and right pot channels, and outputs them to the adders KL and KR, respectively.Similarly, the reverberation sound creation circuit 17 generates the sound signals to be reproduced based on the acoustic signals of the direct sound. Reverberation sounds for left and right pot channels corresponding to the sound field are created and output to adders KL and KR, respectively.

In this way, an acoustic signal in which the direct sound and the early reflected sound and the reverberation sound, which are sound effects, are added is outputted to the adder from L' and KR, and is inputted to the sound image control device 18. This sound image control device 18 includes a plurality of (three in this embodiment)
It is configured to include sound image control circuits U1 to U3.

=13- In general, the propagation characteristics of sound vary depending on the frequency, and the listener 3a seated in the driver's seat 3 and passenger seat 4
, 4a, in order to align the phases of all frequency bands of sound heard near the entrance of the external auditory canal, the acoustic signals are transmitted to the sound image control circuits U1 to 4a for each predetermined frequency band.
Corrected by U3.

Once, the right channel acoustic signal input from the adder KL to the sound image control circuit U1 is passed through a bandpass filter (
(Hereinafter abbreviated as BPF) Frequency band f that is input to F I L and in which this sound image control circuit U] should perform sound image control
1, for example, a signal component of 200 Hz to 400 Hz is r-waved. The output of B P F F 11- is input to the adder ML and also to the cross 1 to - cross generation circuit C1, which will be described later.

Similarly, the right channel acoustic signal from adder KR is
The signal component of the frequency band f1 is converted into an r wave by the BPFFIR and then input to the adder MR and the cross 1 to -re generation circuit C1.

Similarly, in the sound image control circuit U2, the sound signal of the left channel is divided into B P Y7F 2 and frequency band f2.
, for example, 400 to 800 ) 1 z signal components are input to the adder M1- and the cross 1 to 1 z generation circuit C2, and the right channel acoustic signal is BP
The signal is input to the adder MR and the crosstalk generating circuit C2 via FF:2R.

Furthermore, in the sound image control circuit U3, the sound signal of the right channel has a frequency band f3 of B P F F 31-,
For example, after the signal components of 800 to +-600H7 are waved five times, they are input to the adder ML and the cross 1 to 1 clock generation circuit C3, and the right channel acoustic signal is processed by the BPF.
via F3R, the adder MR and the cross) -
The signal is input to the generation circuit CB.

Further, the signal channel acoustic signal from the adder KL is passed through a bypass filter (hereinafter abbreviated as I-tP F) F4.
L, or a low-pass filter (hereinafter abbreviated as LPF) F5L, to the adder M1-. Similarly, the audio signal of your channel from the adder KR is HP F F 4. El or l-PF' I
” 5 is input to the adder M R via R.
For example, HPFF4L, F4Ro') cutoff frequency f4 is chosen to be 1600 H7, and cutoff frequency 15 of LPPF5L, F5R is chosen to be 2001-iz.

FIG. 2 is a block diagram showing a specific configuration of the cross 1-1 generating circuit C1. This cross 1 to - ri generation circuit C
1, the outputs of the BPFFIL and FIR are input to an adder M1 via phase shifters PL and PR and attenuators AL and AR, respectively. The phase shifters PL and PR correct the phase of the input acoustic signal by θL and θR, respectively, and the attenuators AL and AR correct the input acoustic signal by aL and aR.
Attenuates.

In addition, in this cross 1 to -re generation circuit C1, the above-mentioned BP]? The outputs of FIL and FIR are also added by an adder M2, and are further attenuated by attenuation factors a and C (after being attenuated by an attenuator AC), and then input to the adder M].

The output of the adder M1 is output to the adder MC as a cross signal whose phase is corrected by φ by the phase shifter PC.

The remaining cross 1 to -re generation circuits C2 and CB are configured similarly to the above-mentioned cross 1 to -re generation circuits C], and the phase correction amounts θL and θR1 in the phase shifters PL, PR, and pc are
φ and the attenuation rate aL that falls on the radiator AL, AR, and AC,
aR, a, and C correspond to the sound g characteristics of the passenger compartment 2, and each frequency;! Hjor,,'1. f2. In this embodiment, different values are set for each f3.

On the other hand, the direct sound acoustic signal of the entire band from the direct sound adjustment circuit 15 is processed by a buffer B which is a crosstalk "A adjustment means".
CJ\ is output from the adder as a Talostalk adjustment signal through DL and BDR.

The output from the adder MC is supplied to the adder KC, and the acoustic signal from the adder KC is amplified by a power amplifier AMPC and then sent to the speaker. Given to SC.

Furthermore, the acoustic signals from the adders ML and 1VIR are applied to the speakers SL and SR via the power amplifiers AMPL and AMPR.

Figure 3 shows the sound image system f? 71 is a plan view for explaining the functions of the buffers BDL and BDR. For the listener 3a in the driver's seat 3, the speaker SR is placed at a position making a direction angle θ11, and the speaker S
C is arranged at a position forming a directional angle θ12 larger than the directional angle θ1], and speaker S L is arranged at a position forming a directional angle θ]3 larger than the directional angle θ12.

Now, when sound is emitted only from the speaker SR as shown in FIG.

On the other hand, as shown in FIG. 3(2), when the same sound is emitted from the speaker SC as well as the sound from the speaker SR, the listener 3a is directed as shown by the reference mark 12. , (J perceives the direction of the sound source in front of it.

Because of this, the phase of the acoustic signal is converted by aR by the phase shifter PR of the cross-stitch generating circuits C] to C3, and the level is further converted by aR, so that the listener 3a
is the speaker S R, 1ffl indicated by reference numeral 12 above.
The direction of the sound source of the right channel that was previously perceived can be perceived to be outside the speaker SR, as shown by reference numeral r3 in FIG. 3(3).

However, in this state, from the speaker SC to the phase shifter PI
When the sound of the right channel is emitted through -, and the sound of the right channel is also emitted from the speaker SL via B P F F ], L, ~F 3 T-, in this Fig. 3 (3) and Fig. 4. The localization direction of the sound image localized in the front direction of the listener 3a indicated by reference numeral r4 is also indicated by reference numeral 15.
As shown in the figure, it shifts toward the speaker SR side. This means that even if the acoustic energy peak distribution heard at the listening position of the listener 3a is set in front of the listener 3a as indicated by reference numeral 14, the left and right energy distribution is asymmetric. This is because it becomes .

Therefore, by correcting the phase φ using the phase shifter PC, the distribution of the acoustic energy can be made bilaterally symmetrical. As shown in Figure 3 (4),
Listener 3 whose localization direction of the sound image is indicated by the reference numeral 14:
It is possible to form a symmetrical sound field with a spread angle θ1 from this front direction, as shown by reference numeral n6.17.

Note that the divergence angle θ] is relatively large, for example, 70
The phase θl-2θR9φ is adjusted so that it is approximately 1°. Thus, in FIG.
By adjusting the canes gDL and gDR of the buffers BDL and BDR in a state in which a sound field with a bilaterally symmetrical and relatively large divergence angle θ1 indicated by R is formed, that is, the signal processing as described above is performed. By adjusting the level of the cross 1 hake adjustment signal, which is a signal of no signal processing that is The spread angle θ3, for example 30, can form a sound field of
The gain g D L is on the order of degrees.

gDR is adjusted. Similarly, for the listener 4a in the passenger seat 4, a symmetrical sound field with an ideal spread angle θ3 indicated by the reference mark JLa can be formed.

In this way, when the tree falls, the driver's seat 3 and the passenger seat 4 have a sound field of direct sound having a symmetrical and ideal spread angle θ3 indicated by the reference marks J Ra, , J I-a, respectively. , thereby making it possible to localize the sound image in the front direction of the listeners 3εi and 4a without -1 wobbling. Further, the divergence angle θ3 has a phase θL.

Buffer BDI, without changing parameters in the crosstalk generation circuit C1 such as θR2φ.

The adjustment can be made by simply adjusting the BDR cane gDL1gDR, thereby greatly improving the operability and reducing the influence on the driving operation of the car.

FIG. 5 shows a vehicle-mounted sound reproduction device 21 according to another embodiment of the present invention.
FIG. 2 is a block diagram showing the electrical configuration of the embodiment, which is similar to the previous embodiment, and corresponding parts are given the same reference numerals. In this embodiment, unlike the above-mentioned embodiment, only the sound field of the direct sound is adjustable, but the sound field expansion angle θ1 is similarly applied to the sound effects of early reflected sound and reverberant sound.
is adjustable.

That is, the acoustic signal of the early reflected sound of the left channel from the early reflected sound creation circuit 16 is sent to the buffer B of the gain gRL.
The acoustic signal of the early reflection sound of the right channel is inputted to the adder KC as a cross I.multidot.1iW signal via RL, and similarly, the acoustic signal of the early reflection sound of the right channel is input to the buffer 13 with a gain of g RF.
It is input to adder KC via RR. In addition, the right channel reverberant sound acoustic signal from the reverberant sound generation circuit 17 is sent to the adder KC via the buffer BEL with a gain gEL.
The right channel reverberant sound acoustic signal is input to the adder KC via a buffer BER with a gain gER.

This makes it possible to adjust the spread angle θ1 of the sound field even for sound effects such as early reflected sounds and reverberant sounds.
For example, it is possible to precisely create a sound field desired by the listener depending on the type of music.

FIG. 6 is a block diagram showing the electrical configuration of a vehicle-mounted sound reproducing device 31 according to still another embodiment of the present invention, and parts corresponding to those in the previous embodiment are given the same reference numerals. In this embodiment, only two speakers SL and SRI are provided in the vehicle interior 2, and therefore, the crossstoke generating circuits C]a to C3a of the sound image control circuits UIa to U3a forming the sound image control device 18a. is constructed as follows.

FIG. 7 is a block diagram showing a specific configuration of the cross daughter generation circuit C1a. This cross 1 hake generation circuit C
1a, the output of the B PFF I L is sent to the phase shifter PL and the attenuator through I- to the adder M 1
a, is added to the output of BPFFIR, and then output to the adder MR. Further, the output of BPFFIR is sent to an adder M2 via a phase shifter PR and an attenuator AR.
a, and after being added with the output of BPFF IL,
It is output to the adder ML.

The remaining crosstalk generating circuits C2a and C3a are constructed in the same manner as this crosstalk generating circuit C1a, except for the phase shifter P L as in the previous embodiment.

Phase correction amount θL, θR and attenuator AL in PR
, AR are set to different values for each frequency/Ht range f], , f2°f3 in accordance with the acoustic characteristics of the vehicle interior 2 in this embodiment.

Also, the acoustic signal from the adder ML is sent to the adder KLa,
After being added with the acoustic signals from the buffers BDR, BRR, and BER, it is applied to the power amplifier AMPI-. Similarly, the acoustic signal from adder M R is transmitted to adder K
At Ra, the signal is added to the acoustic signals from the buffers BDL, BRL, and BEL, and then output to the power amplifier AMPR.

Once, the phases θL, θR and the attenuation rates aL, a
By adjusting R, as shown in FIG.
Even with the two speakers SL and SR, a symmetrical and expansive sound field JR similar to the above embodiment is formed in the driver's seat 3, and the gains gDL1gDR; gRL, gRR
; By adjusting gEL and gER, the respective sound fields of direct sound, early reflected sound, and reverberant sound can be adjusted to a desired spread angle θ3, as indicated by reference JRa, for example.
You can set it to

In this embodiment, the optimum sound field as shown in FIG. 8 is formed on the passenger seat 4 side by adjusting the phases θL, θR and the attenuation rates aL, a, R. Good too.

Note that in each of the above-mentioned embodiments, the buffer BDL.

BDR: A filter is installed on the acoustic signal line passing through BRL, BRR, BEL, and BER (P waves are generated only in a specific frequency band, for example, the vocal audio band, and the sound field of only that band is narrowed. The sound image in the band may be localized without fluctuation.

Effects of the Invention As described above, according to the present invention, a stereo sound signal of a fundamental sound from an audio signal source and an sound effect sound signal such as a reverberation sound created by processing the sound signal can be and each right speaker, and corrects at least one of the level and phase of the basic sound and sound effect of each of these left and right channels to create a cross 1 hake signal, and It is applied to the speaker or to the center speaker placed near the center position f-1 of the left and right speakers. In addition, a signal obtained by correcting the level of at least one of the basic tone acoustic signal and the sound effect acoustic signal of each of the left, 3L and right speakers is sent to the right and left speakers as a crosstalk adjustment signal. Since the signal is output to the center speaker, it is possible to form a symmetrical and expansive sound field at the listening position.

Furthermore, the spread angle of the sound field formed by the cross I/- signal can be easily adjusted by adjusting the level of the cross-I adjustment signal. In the past, even if the crosstalk signals were created for each of a plurality of frequency bands, depending on the acoustic characteristics of the acoustic space in which each speaker is placed, the crosstalk signals were created for each of a plurality of frequency bands. The spread angle of the sound field can be easily set to a desired size by changing the level of the crosstalk signal without changing the amount of phase and level correction for each frequency band to be created. This can greatly improve operability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the electrical configuration of a vehicle-mounted sound reproducing device 1 according to an embodiment of the present invention, FIG. Figure 3 shows the sound image control circuits U1 to U3 and buffer B.
DL, BDR θ) function, FIG. 4 is a plan view showing the expansion of the embodiment shown in FIG. 1, and FIG. 5 is an in-vehicle sound reproduction of another embodiment of the present invention Device 2
1, FIG. 6 is a block diagram showing the electrical configuration of a vehicle-mounted sound reproduction device 3 according to still another embodiment of the present invention, and FIG. Crosstalk of the sound image control circuit U]a used in the reproduction device 31
FIG. 8 is a block diagram illustrating a one-dimensional structure of the noise generating circuit C1, and FIG. 8 is a plan view showing the expansion of the sound field according to the embodiment shown in FIG. 6. 1.21.31 - Vehicle-mounted sound reproduction device, 2 - Vehicle interior,
3 driver's seat, 4 passenger seat, 3a, 4a listener, 11
Acoustic signal source, 14 Sound field control device, 15 Direct sound adjustment circuit, 16 Early reflected sound creation circuit, 17 Reverberant sound IY generation circuit, ], 8.1.8a Sound (Ki control device, AL, A
R, AC attenuator, BDL, BDR,; BRL, BRR
; BEL, BER-buffer, C1-C3; C1a
~C3a-Crosstalk generation circuit, PL, PR, PC phase shifter, SL, Sri'. SC speaker, U1~U3; U1a~U
3 a Sound image control circuit agent Patent attorney Kei Saikyo 51~! ＼ iVROL Figure 8 Procedural amendment October 29, 1991

Claims (2)

[Claims] (1) Left and right speakers arranged at different directional angles in front of the left and right sides of the listening position, and near the center of the left and right speakers, and closer to one of the left and right speakers; a center speaker disposed at a position with a larger direction angle smaller than the other; an acoustic signal source outputting an acoustic signal of a fundamental sound of a left channel to the left speaker and an acoustic signal of a fundamental sound of a right channel to the right speaker; , a sound effect generating means for calculating and processing basic sound acoustic signals of both left and right channels from an acoustic signal source to generate sound effect acoustic signals of each left and right channel, and outputting the sound effects to the left and right speakers, respectively; crosstalk signal generating means for correcting and adding at least one of the phases and levels of the basic sound and sound effect acoustic signals of both the left and right channels, and outputting the resulting crosstalk signal to the center speaker as a crosstalk signal; The asymmetrical device includes crosstalk adjustment means for correcting and adding the level of at least one of the acoustic signal of the basic sound and the acoustic signal of the sound effect, and outputting the result to the center speaker as a crosstalk adjustment signal. Sound field correction device. (2) Left and right speakers are placed at different directional angles in front of the left and right sides of the listening position, and the acoustic signal of the fundamental sound of the left channel is output to the left speaker, and the sound signal of the fundamental sound of the left channel is output to the right speaker. an acoustic signal source that outputs the acoustic signal of the fundamental sound of the channel; and arithmetic processing of the acoustic signal of the fundamental tone of both the left and right channels from the acoustic signal source to create an acoustic signal of the sound effect of each left and right channel; and sound effect generating means for outputting to the right speaker, respectively; crosstalk signal generating means for generating a crosstalk signal for forming a field, and outputting the crosstalk signal to the right and left speakers, respectively; and at least an acoustic signal of a fundamental sound and an acoustic signal of a sound effect of each left and right channel. An asymmetric sound field correction device comprising: crosstalk adjustment means for correcting the level of either one and outputting the corrected crosstalk adjustment signal to the right and left speakers, respectively.