JPH09252499A - Multi-channel sound reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sound reproducing device in which a conventional stereo equipment (power amplifiers and speakers by 2-channels) conducts multi-channel sound field reproduction. SOLUTION: A signal of a right surround channel 101a is added to a signal of a right channel 101b by a 1st adder circuit 105a, an inverted signal by a 1st phase inverting circuit 102a is attenuated by a 1st attenuation circuit 103a and a signal of a left channel 101d is added to the attenuated signal at a 2nd adder 105b. A signal of the left surround channel 101e and a signal of a left channel 101d are added by the 2nd adder circuit 105b and an inverted signal by a 2nd phase reversing circuit 102b is attenuated by a 2nd attenuation circuit 103b and a signal of the right channel 101b is added to the attenuated signal at the 1st adder 105a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-channel sound reproducing device capable of simply reproducing a surround sound signal.

[0002]

2. Description of the Related Art FIG. 12 shows, for example, JP-A-6-233377.
FIG. 6 is a top view showing a conventional multi-channel sound reproducing device shown in Japanese Patent Publication No. In the figure, 800 is a listener, 801
Is a 5-channel signal source, 801a is a right surround channel output terminal of the 5-channel signal source 801, 801b is a right channel output terminal of the 5-channel signal source 801, 8
01c is the center channel output terminal of the 5-channel signal source 801, the left channel input terminal, 801d is the left channel output terminal of the 5-channel signal source 801, 801e.
Is a left surround channel output terminal of the 5-channel signal source 801, 802a is a right surround channel power amplifier connected to the right surround channel output terminal 801a, 802b is a right channel power amplifier connected to the right channel output terminal 801b, and 802c is a center. A center channel power amplifier connected to the channel output terminal 801c, 802d is a left channel power amplifier connected to the left channel output terminal 801d, 80
2e is a left surround channel power amplifier connected to the left surround channel output terminal 801e, 803a
Is a right surround channel speaker disposed on the right side and rear of the listener 800 and connected to the right surround channel power amplifier 802a, and 803b is disposed on the front right of the listener 800 and connected to the right channel power amplifier 802b. 803c is located in the center of the front of the listener 800 and is a center channel power amplifier 8
Center channel speaker connected to 02c, 80
3d is a left channel speaker that is arranged on the front left of the listener 800 and is connected to a left channel power amplifier 802d. Reference numeral 803e is a left surround channel speaker that is arranged on the left side and rear of the listener 800 and is connected to a left surround channel power amplifier 802a. Is.

Next, the operation will be described. Right surround channel output terminal 801 of 5-channel signal source 801
The right surround channel signal output from a is amplified by the right surround channel power amplifier 802a. This signal is the right surround channel speaker 803.
It is applied to a and is radiated as a sound into the space where the listener 800 is present. Similarly, the right channel signal output from the right channel output terminal 801b of the 5-channel signal source 801 is amplified by the right channel power amplifier 802b. This signal is applied to the right channel speaker 803b and radiated as a sound into the space where the listener 800 is present. Similarly, the center channel signal output from the center channel output terminal 801c of the 5-channel signal source 801 is amplified by the center channel power amplifier 802c. This signal is the center channel speaker 80.
It is applied to 3c and emitted as a sound into the space where the listener 800 is present. Similarly, the left channel signal output from the left channel output terminal 801d of the 5-channel signal source 801 is amplified by the left channel power amplifier 802d. This signal is applied to the left channel speaker 803d and radiated as a sound into the space where the listener 800 is present. Similarly, the left surround channel signal output from the left surround channel output terminal 801e of the 5-channel signal source 801 is a left surround channel power amplifier 80.
It is amplified by 2e. This signal is applied to the left surround channel speaker 803e, and the listener 80
It is radiated to the space where 0 is.

The 5-channel signal source 801 is a listener 80.
It is a signal source created to localize a sound image in all directions of a horizontal plane 360 ° of 0. The listener 800 is the same as when the five-channel signal source 801 was created.
A left surround channel speaker 802a, a left channel speaker 802b, a center channel speaker 802c, a right channel speaker 802d, and a right surround channel speaker 802e are arranged around, and the sound from each speaker becomes the same level at the position of the listener 800. With such adjustment, the sound image localization exactly the same as when the 5-channel signal source 801 is created can be reproduced.

[0005]

Since the conventional multi-channel sound reproducing device is constructed as described above, it is the same as when the signal source is formed around the listener 800 with a speaker corresponding to the number of channels. Must be placed in
A large space was required during playback.

Further, the power amplifiers and speakers for the minimum number of channels are required, which is a great burden in terms of equipment cost and the like for individual reproduction.

The present invention has been made in order to solve the above problems, and multi-channel sound reproduction which can easily reproduce multi-channel stereo by adding some circuits to the equipment of the conventional 2-channel stereo. The purpose is to obtain the device.

[0008]

In a multi-channel sound reproducing apparatus according to the present invention, a surround channel signal is reproduced by a corresponding front speaker, and the surround channel signal is inverted and attenuated in phase. The front channel speaker is used for reproduction.

Further, the surround channel signal is reproduced by the corresponding front speaker, and the surround channel signal is reversed in phase and time delayed and reproduced by the opposite front channel speaker.

In addition, the surround channel signal is reproduced by the corresponding front speaker, and the surround channel signal is inverted in phase to attenuate a part of the band and delay a part of the band, thereby delaying the part of the surround channel signal to the opposite front channel. It is configured to be reproduced from a speaker.

In addition, the surround channel signal is reproduced by the corresponding front speaker, the phase of the surround channel signal is inverted, a part of the band is attenuated, and a part of the band is delayed to the opposite front channel. In addition to reproducing from the speaker, a sensor for detecting the listener is provided to control the attenuation amount and delay time of the variable attenuation circuits and variable delay circuits provided in the left and right channels according to the listener's position.

The surround channel signal is reproduced by the corresponding front speaker, the phase of the surround channel signal is inverted, a part of the band is attenuated, and a part of the band is delayed to the opposite front channel. In addition to playing from the speaker, a sensor that detects the listener is installed so that the speaker faces the listener,
The configuration is such that the attenuation amount and delay time of the variable attenuation circuit and variable delay circuit are controlled according to the position of the listener.

In addition, the surround channel signal is reproduced by the corresponding front speaker, the surround channel signal is inverted and attenuated to be reproduced from the opposite front channel speaker, and the surround channel signal is variable attenuated depending on the position of the listener. The circuit and the variable delay circuit are configured so that the amount of attenuation and the delay time can be controlled.

In addition, the surround channel signal is reproduced by the corresponding front speaker, the surround channel signal is reversed in phase and delayed in time, and reproduced by the opposite front channel speaker, and is varied depending on the position of the listener. The configuration is such that the attenuation amount and delay time of the attenuation circuit and variable delay circuit can be controlled.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION In the multi-channel sound reproducing device according to the embodiment of the present invention, the surround channel signal is reproduced from the left and right speakers while changing the volume in the opposite phase. If the sound volume is the same, the sound is not localized, but if there is an appropriate sound volume difference, the sound image is localized to the rear of the listener on the loudspeaker side.

Further, the surround channel signals are set to have opposite phases from the left and right speakers and are delayed by one channel for reproduction. If there is no time delay, the sound is not localized, but if there is an appropriate time delay, the sound image is localized laterally behind the listener who is not time delayed.

Further, the volume of a part of the band of the surround channel signal is changed from the left and right speakers in opposite phase, and the part of the band is reproduced with a time difference. If the sound volume is the same and there is no time difference, the sound is not localized, but if there is an appropriate sound volume difference in the low frequency range, the sound image is localized to the rear of the listener on the loud speaker side, and in the middle frequency range it is appropriate. If there is a delay, the sound image is localized laterally behind the listener on the side of the speaker that is not time delayed.

Further, a sensor is provided to detect the position of the listener, and at the listener's position, the volume of a part of the surround channel signal is changed in opposite phase from the left and right speakers to change the sound volume of a part of the band. I attached it and played it back. As a result, at the listener's position, it is possible to always control to an appropriate volume difference in the low tone range and to control to an appropriate time delay difference in the middle tone range. Therefore, as long as the listener is in front of the speaker, the surround channel sound with the optimum volume difference and time delay difference can be reproduced, and the surround sound image is always localized at the rear side of the listener.

Further, a sensor is provided to detect the positions of the listeners and rotate the turntable so that the main emission axes of the left and right speakers face the direction of the listeners, and the surround channel signals are transmitted from the left and right speakers to the listeners. At the position, the volume of some bands was changed in antiphase, and some bands were reproduced with a time difference. As a result, at the listener's position, it is possible to always control to an appropriate volume difference in the low tone range and to control to an appropriate time delay difference in the middle tone range. Therefore, as long as the listener is in front of the speaker, the surround channel sound with the optimum volume difference and time delay difference can be reproduced, and the surround sound image is always localized at the rear side of the listener.

Further, the surround channel signal is reproduced from the left and right speakers by changing the volume in the opposite phase, and a variable delay circuit and a variable attenuating circuit are provided in at least one of the left and right front channel reproduction systems so that the left and right volume difference at the listening position, The phase difference is the same as that in the center between the speakers. If the sound volume is the same, the sound is not localized, but if there is an appropriate sound volume difference, the sound image is localized to the rear of the listener on the loudspeaker side.

Also, the surround channel signal is reproduced from the left and right speakers with an opposite phase delayed by one channel time, and a variable delay circuit and a variable attenuator circuit are provided in at least one of the left and right front channel reproduction systems to produce a left and right volume at the listening position. The difference and the phase difference are the same as those in the center between the speakers. If the sound volume is the same, the sound is not localized, but if there is an appropriate sound volume difference, the sound image is localized to the rear of the listener on the loudspeaker side.

The present invention will be specifically described below with reference to the drawings showing the embodiments. Embodiment 1. 1 is a top view showing a multi-channel sound reproducing device according to a first embodiment of the present invention. In the figure, 101 is a 5-channel signal source, 101a is a right surround channel output terminal of the 5-channel signal source 101,
101b is a right channel output terminal of the 5-channel signal source 101, 101c is a center channel output terminal of the 5-channel signal source 101, 101d is a left channel output terminal of the 5-channel signal source 101, 101e is a left surround channel of the 5-channel signal source 101. Output terminal, 1
02a has an input terminal 101 on the right surround channel
The first phase inverting circuit connected to a, 102b the second phase inverting circuit whose input is connected to the left surround channel output terminal 101e, 103a whose input is connected to the output of the first phase inverting circuit 102a First attenuation circuit, 10
3b is a second attenuation circuit whose input is connected to the output of the second phase inversion circuit 102b, 104 is a third attenuation circuit whose input is connected to the center channel output terminal 101c, 1
Reference numeral 05a is a first adder circuit for adding the output of the right surround channel output terminal 101a, the output of the right channel output terminal 101b, the output of the second attenuation circuit 103b and the output of the third attenuation circuit 104, and 105b is the left surround. The output of the channel output terminal 101e, the output of the left channel output terminal 101d, the output of the first attenuating circuit 103a, and the third
A second adder circuit for adding the output of the attenuation circuit 104 of
106a is a right channel power amplifier whose input is connected to the output of the first addition circuit 105a, 106b is a left channel power amplifier whose input is connected to the output of the second addition circuit 105b, and 107a is its right input. A right channel speaker connected to the channel power amplifier 106a, 107b a left channel speaker whose input is connected to the left channel power amplifier 106b, 108
Is a listener at a position substantially equidistant from the right channel speaker 107a and the left channel speaker 107b.

FIG. 2 is a sound image localization direction- (left channel level / right channel level) relationship diagram which complements the first embodiment of the present invention. In the anechoic chamber, the speaker 2 is placed in front of the listener as in FIG. Are arranged so that the two speakers and the listener are at the vertices of a substantially equilateral triangle, and the level ratio between the left and right channels and the sound image localization when signals with opposite phase levels are reproduced from the two speakers. It is a plot of directions. As the signal of the opposite phase reproduced from the left channel is increased, the sound image localization direction is localized outside the speaker position of the right channel, and when the left and right levels are the same, clear localization does not occur.

Next, the operation of the first embodiment will be described. The signal from the right surround channel output terminal 101a is branched into two, one of which is a first adder circuit 105a, a right channel power amplifier 106a, and a right channel speaker 107a.
Is propagated as sound to the listener 108 via. The other is the first phase inversion circuit 102a and the first attenuation circuit 103.
a, the second addition circuit 105b, the left channel power amplifier 106b, and the left channel speaker 107b, and propagates as a sound to the listener 108. The sound radiated from the left channel speaker 107b is transmitted to the left channel speaker 10
Compared with the sound radiated from 7a, the first phase inversion circuit 102a and the first attenuation circuit 103a are redundant in the circuit, and the amplitude is smaller in the opposite phase by the attenuation amount of the first attenuation circuit 103a. . Therefore, the sound is reproduced from the left and right speakers at the ratio shown in the graph of FIG. 2, so that the speaker having the larger amplitude, that is, the right channel speaker 1
The signal of the right surround channel is localized on the outside of 07a.

The signal at the right channel output terminal 101b is
First adder circuit 105a, right channel power amplifier 1
06a, propagates as a sound to the listener 108 via the right channel speaker 107a. Therefore, in the right channel signal, the sound image is localized at the position of the right channel speaker 107a.

The signal at the center channel output terminal 101c has a half amplitude through the third attenuator circuit 104 having a half attenuation amount. This signal is branched into two, and one propagates as a sound to the listener 108 via the first adding circuit 105a, the right channel power amplifier 106a, and the right channel speaker 107a. The other propagates as a sound to the listener 108 via the second addition circuit 105b, the left channel power amplifier 106b, and the left channel speaker 107b. Since the sounds reproduced from the left and right channel speakers have the same phase and the same amplitude, the sound image of the center channel is localized at the center of the left and right speakers.

The signal at the left channel output terminal 101d is
Second adder circuit 105b, left channel power amplifier 1
06b, propagates to the listener 108 via the left channel speaker 107b. Therefore, the signal of the left channel is
The sound image is localized at the position of the left channel speaker 107b.

Left surround channel output terminal 101e
Signal is split into two, one of which is the second adder circuit 105.
b, the sound is propagated to the listener 108 as sound through the left channel power amplifier 106b and the left channel speaker 107b. The other is the second phase inversion circuit 102b, the second attenuation circuit 103b, the first addition circuit 105a, the right channel power amplifier 106a, and the right channel speaker 10.
The sound propagates to the listener 108 via 7a. Comparing the sound radiated from the right channel speaker 107a with the sound radiated from the left channel speaker 107b, the second phase inversion circuit 102b and the second attenuation circuit 10 in the circuit are compared.
3b is omitted, and the second attenuation circuit 1 is provided in antiphase.
The amplitude is small by the amount corresponding to the attenuation amount of 03b. Therefore, FIG.
Since the sound is reproduced from the left and right speakers at the ratio shown by the graph, the sound image of the left surround channel is localized outside the speaker having the larger amplitude, that is, the left channel speaker 107b.

As described above, the first attenuation circuit 103a,
By optimally adjusting the amount of attenuation of the second attenuator circuit 103b, sound image localization similar to that using five power amplifiers and speakers can be realized with only two power amplifiers and speakers on the left and right as in the conventional example. .

In the first embodiment, the attenuation circuit 103a,
Although the attenuation amount is fixed to 103b, if the listener can be changed according to the listening position of the listener 108,
A wide listening area can be secured.

Embodiment 2 FIG. 3 is a top view showing a multi-channel sound reproducing device according to a second embodiment of the present invention. In the figure, 201 is a 5-channel signal source, 201
a is a right surround channel output terminal of the 5-channel signal source 201, 201b is a right channel output terminal of the 5-channel signal source 201, and 201c is a 5-channel signal source 2
01 center channel output terminal, 201d is the left channel output terminal of the 5-channel signal source 201, 201e
Is a left surround channel output terminal of the 5-channel signal source 201, 202a is a first phase inverting circuit whose input is connected to the right surround channel output terminal 201a, 20
2b has a left surround channel output terminal 201e
A second phase inverting circuit 203a connected to the second phase inverting circuit 203b, an input 203a is a first delay circuit whose input is connected to the output of the first phase inverting circuit 202a, and 203b is a second phase inverting circuit 202b having an input.
Is a second delay circuit connected to the output of the input terminal, 204 is an attenuator circuit whose input is connected to the center channel output terminal 201c, and 205a is a right surround channel output terminal 201.
The output of a and the output of the right channel output terminal 201b and the second
A first adding circuit for adding the output of the delay circuit 203b and the output of the attenuating circuit 204, 205b an output of the left surround channel output terminal 201e, an output of the left channel output terminal 201d, and an output of the first attenuating circuit 203a. Third
A second adder circuit for adding the output of the attenuation circuit 204 of
206a is a right channel power amplifier whose input is connected to the output of the first addition circuit 205a, 206b is a left channel power amplifier whose input is connected to the output of the second addition circuit 205b, and 207a is its right input. The right channel speaker connected to the channel power amplifier 206a, 207b the left channel speaker whose input is connected to the left channel power amplifier 206b, 208
Is a listener at a position substantially equidistant from the right channel speaker 207a and the left channel speaker 207b.

FIG. 4 is a relationship diagram of the sound image localization direction-left and right channel delay time difference which complements the second embodiment of the present invention. In the anechoic room, two speakers are provided in front of the listener as in FIG. This is a plot of the time difference between the left and right channels and the sound image localization direction when the two speakers and the listener are arranged so as to be the vertices of a substantially equilateral triangle, and the signals having the opposite phase time difference are reproduced from the two speakers. is there. As the time difference between the right channel signal and the left channel signal is increased, the sound image localization direction is located outside the right channel speaker position.
If the left and right levels are the same, no clear localization will occur.

Next, the operation of the second embodiment will be described. The signal from the right surround channel output terminal 201a is branched into two, one of which is a first adder circuit 205a, a right channel power amplifier 206a, and a right channel speaker 207.
Propagate as a sound to the listener 208 via a. The other is a first phase inversion circuit 202a and a first delay circuit 203.
a, the second addition circuit 205b, the left channel power amplifier 206b, and the left channel speaker 207b, and propagates as a sound to the listener 208. The sound radiated from the left channel speaker 207b is transmitted to the left channel speaker 20.
Compared with the sound radiated from 7a, the first phase inversion circuit 202a and the first delay circuit 203a are redundant in the circuit, and the time is delayed in the opposite phase by the delay time of the first attenuation circuit 203a. . For this reason, since a sound with a time difference is reproduced from the left and right speakers by the delay time shown in the graph of FIG. 4, the right surround channel signal is localized outside the speaker without delay, that is, the right channel speaker 207a. .

The signal at the right channel output terminal 201b is
First adder circuit 205a, right channel power amplifier 2
06a, propagates as sound to the listener 208 via the right channel speaker 207a. Therefore, in the right channel signal, the sound image is localized at the position of the right channel speaker.

The signal from the center channel output terminal 201c is halved through the attenuator circuit 204 whose halving amount is ½.
Becomes the amplitude of. This signal is split into two, one is the first
Adder 205a, right channel power amplifier 206
a, the listener 20 via the right channel speaker 207a
8 propagates as sound. The other is the second adder circuit 2
05b, the left-channel power amplifier 206b, and the left-channel speaker 207b propagate as a sound to the listener 208. Since the sounds reproduced from the left and right channel speakers have the same phase and the same amplitude, the sound image of the center channel is localized at the center of the left and right speakers.

The signal at the left channel output terminal 201d is
Second adder circuit 205b, left channel power amplifier 2
06b, propagates to the listener 208 via the left channel speaker 207b. Therefore, the signal of the left channel is
The sound image is localized at the position of the left channel speaker 207b.

Left surround channel output terminal 201e
Signal is divided into two, one of which is the second adder circuit 205.
b, the sound is propagated to the listener 208 as sound through the left channel power amplifier 206b and the left channel speaker 207b. The other is the second phase inversion circuit 202b, the second delay circuit 203b, the first addition circuit 205a, the right channel power amplifier 206a, and the right channel speaker 20.
The sound propagates to the listener 208 via 7a as a sound. Comparing the sound radiated from the right channel speaker 207a with the sound radiated from the left channel speaker 207b, the second phase inversion circuit 202b and the second delay circuit 20 in the circuit are compared.
3b is additionally provided, and the second delay circuit 2 is provided in antiphase.
The time is delayed by an amount corresponding to the delay time of 03b. For this reason, since a sound with a time difference is reproduced from the left and right speakers for the delay time shown in the graph of FIG. 4, the left surround channel signal is localized outside the speaker without delay, that is, the left channel speaker 207b. .

As described above, the first delay circuit 203a,
By optimally adjusting the delay time of the second delay circuit 203b, sound image localization similar to that using five power amplifiers and speakers can be realized with only two power amplifiers and speakers on the left and right as in the conventional example. .

In the second embodiment, the first delay circuit 2
Although the delay time of 03a and the second delay circuit 203b is fixed, if the listener can be changed according to the listening position of the listener 208, a wide listening area can be secured.

Embodiment 3 FIG. 5 is a top view showing a multi-channel sound reproducing device according to a third embodiment of the present invention. In the figure, 301 is a 5-channel signal source, 301
a is a right surround channel output terminal of the 5-channel signal source 301, 301b is a right channel output terminal of the 5-channel signal source 301, and 301c is a 5-channel signal source 3
01 center channel output terminal, 301d is left channel output terminal of 5 channel signal source 301, 301e
Is a left surround channel output terminal of the 5-channel signal source 301, 302a is a first phase inverting circuit whose input is connected to the right surround channel output terminal 301a, 30
2b has a left surround channel output terminal 301e
A second phase inversion circuit connected to the first phase inversion circuit 302a, and a second phase inversion circuit 303a connected to the output of the first phase inversion circuit 302a.
A first filter for dividing the input signal into a second filter 303b is a second filter for dividing a band whose input is connected to the output of the second phase inverting circuit 302b into two, and a reference numeral 303b is a input second phase The second connected to the output of the inverting circuit 302b
Band division filter, 304a is a first delay circuit whose input is connected to the high-pass output side of the first filter 303a, and 304b is a second delay circuit whose input is connected to the high-pass output side of the second filter 303b. , 305a is a first attenuator circuit whose input is connected to the low-pass output side of the first filter 303a, and 305b is a second filter 3 whose input is
A second attenuator circuit connected to the low-pass output side of 03b,
Reference numeral 306 denotes a third attenuator circuit whose input is connected to the center channel output terminal 301c, and 307a denotes an output of the right surround channel output terminal 301a, an output of the right channel output terminal 301b, an output of the second delay circuit 304b, and a second delay circuit 304b. A first adder circuit for adding the outputs of the attenuating circuit 305b and the third attenuating circuit 306, 307b is an output of the left surround channel output terminal 301e, an output of the left channel output terminal 301d, and an output of the first delay circuit 304a. And a second attenuator circuit 308a for adding the first attenuator circuit 305a and the output of the third attenuator circuit 306, 308a is a right channel power amplifier whose input is connected to the output of the first attenuator circuit 307a, 308b Is a left-channel power amplifier whose input is connected to the output of the second adder circuit 307b, and 309a is its Force the right channel power amplifier 3
A right channel speaker connected to 08a, 309b is a left channel speaker whose input is connected to the left channel power amplifier 308b, and 310 is a listener who is located approximately equidistant from the right channel speaker 309a and the left channel speaker 309b. .

Next, the operation of the third embodiment will be described. The signal from the right surround channel output terminal 301a is branched into two, one of which is a first adder circuit 307a, a right channel power amplifier 308a, and a right channel speaker 309a.
Propagates as a sound to the listener 310 via. The other is a first phase inversion circuit 302a and a first filter 303a.
2 through the crossover frequency of about 600Hz via
The signal is divided into two, and the low-pass side is mixed by the first attenuator circuit 305a, and the high-pass side is mixed by the second adder circuit 307b via the first delay circuit 304a to become one signal again. This signal is further fed to the left channel power amplifier 30.
8b, listener 3 via left channel speaker 309b
10 propagates as a sound. Left channel speaker 309
Comparing the sound radiated from b with the sound radiated from the right channel speaker 309a, in the bass range, the first phase inversion circuit 302a and the first filter 30 are included in the circuit.
The low-pass portion 3a and the first attenuation circuit 305a are additionally provided, and the amplitude is small in the opposite phase by the attenuation amount of the first attenuation circuit 305a. Therefore, as shown in the graph of FIG. 2, the right surround channel signal is localized outside the speaker having the larger amplitude, that is, the right channel speaker 307a, depending on the amplitude ratio of the sounds reproduced from the left and right speakers. Also, in the high range, the first
The phase inversion circuit 302a, the high-pass part of the first filter 303a, and the first delay circuit 304a are additionally provided, and the delay time is delayed by the delay time of the first delay circuit 304a in the opposite phase. Therefore, as shown in the graph of FIG. 4, due to the time difference between the sounds reproduced from the left and right speakers, the speaker without delay, that is, the right channel speaker 307.
The sound image signal of the right surround channel is localized outside a.

The signal at the right channel output terminal 301b is
First adder circuit 307a, right channel power amplifier 3
08a, propagates as a sound to the listener 310 via the right channel speaker 309a. Therefore, in the right channel signal, the sound image is localized at the position of the right channel speaker.

The signal at the center channel output terminal 301c is halved through the attenuator circuit 306 whose attenuation amount is ½.
Becomes the amplitude of. This signal is split into two, one is the first
Adder 307a, right channel power amplifier 308
a, the listener 31 through the right channel speaker 309a
Propagate as a sound to 0. The other is the second adder circuit 3
07b, the left channel power amplifier 308b, and the left channel speaker 309b propagate to the listener 310 as a sound. Since the sounds reproduced from the left and right channel speakers have the same phase and the same amplitude, the sound image of the center channel is localized at the center of the left and right speakers.

The signal at the left channel output terminal 301d is
Second adder circuit 307b, left channel power amplifier 3
08b, propagates to the listener 310 via the left channel speaker 309b. Therefore, the signal of the left channel is
The sound image is localized at the position of the left channel speaker 309b.

Left surround channel output terminal 301e
Signal is divided into two, one of which is the second adder circuit 307.
b, propagates to the listener 310 as sound through the left channel power amplifier 308b and the left channel speaker 309b. The other is divided into two with a crossover frequency of about 600 Hz through the second phase inversion circuit 302b and the second filter 303b, and the low-pass side is the second attenuation circuit 305b and the high-pass side is the second. The signal is mixed by the first adder circuit 307a via the second delay circuit 304b and becomes one signal again. This signal is further transmitted to the right channel power amplifier 308a and the right channel speaker 309a.
Propagates as a sound to the listener 310 via. When the sound radiated from the right channel speaker 309a is compared with the sound radiated from the left channel speaker 309b, the second phase inversion circuit 302b, the second
Low-pass part of the filter 303b of the second attenuator circuit 30
5b is additionally provided, and the second attenuator circuit 3 has the opposite phase.
The amplitude is small by the amount of attenuation of 05b. Therefore, as shown in the graph of FIG. 2, the left surround channel bass signal is localized outside the speaker having the larger amplitude, that is, the left channel speaker 307b, depending on the amplitude ratio of the sounds reproduced from the left and right speakers. . In the treble range, the second phase inversion circuit 302b, the high-pass part of the second filter 303b, and the second delay circuit 304b are included in the circuit.
Of the second delay circuit 304 in the opposite phase.
The time is delayed by the delay time of b. Therefore, as shown in the graph of FIG. 4, due to the time difference between the sounds reproduced from the left and right speakers, the high-range signal of the left surround channel is localized outside the speaker without delay, that is, the left channel speaker 309a.

As described above, the first attenuation circuit 305a,
By optimally adjusting the amount of attenuation of the second attenuating circuit 305b and the delay time of the first delay circuit 304a and the second delay circuit 304b, only two power amplifiers on the left and right, and a speaker are provided with five power amplifiers as in the conventional example. Sound image localization similar to that using the power amplifier and speaker of can be realized.

In the third embodiment, the first delay circuit 30
4a, the delay time of the second delay circuit 304b and the attenuation amount of the first attenuating circuit 305a and the second attenuating circuit 305b are fixed, but the listener can be changed according to the listening position of the listener 310. By doing so, a wide listening area can be secured.

Embodiment 4 6 is a top view showing a multi-channel sound reproducing device according to a fourth embodiment of the present invention. In the figure, 401 is a 5-channel signal source, 401
a is a right surround channel output terminal of the 5-channel signal source 401, 401b is a right channel output terminal of the 5-channel signal source 401, and 401c is a 5-channel signal source 4
01 center channel output terminal, 401d is a left channel output terminal of the 5-channel signal source 401, 401e
Is a left surround channel output terminal of the 5-channel signal source 401, 402a is a first phase inverting circuit whose input is connected to the right surround channel output terminal 401a, 40
Input 2b is left surround channel output terminal 401e
The second phase inversion circuit 403a connected to the input terminal 403a has a band whose input is connected to the output of the first phase inversion circuit 402a.
A first filter 403b for dividing the band whose input is connected to the output of the second phase inverting circuit 402b into a second filter, and 403b an input for the second phase The second connected to the output of the inverting circuit 402b
Band division filter, 404a is a first delay circuit whose input is connected to the high-pass output side of the first filter 403a, and 404b is a second delay circuit whose input is connected to the high-pass output side of the second filter 403b. , 405a is a first attenuator circuit whose input is connected to the low-pass output side of the first filter 403a, and 405b is a second filter 4 whose input is the second filter 4.
A second attenuator circuit connected to the low-pass output side of 03b,
Reference numeral 406 denotes a third attenuation circuit whose input is connected to the center channel output terminal 401c, and 407a denotes an output of the right surround channel output terminal 401a, an output of the right channel output terminal 401b, an output of the second delay circuit 404b, and a second delay circuit 404b. A first adder circuit for adding the outputs of the attenuation circuit 405b and the third attenuation circuit 406, and 407b is an output of the left surround channel output terminal 401e, an output of the left channel output terminal 401d, and an output of the first delay circuit 404a. And a second adder circuit for adding the output of the first attenuator circuit 405a and the third attenuator circuit 406, and 408a is a right channel external control type delay whose input is connected to the output of the first adder circuit 407a. Circuit 408b is a left-channel externally controlled delay circuit whose input is connected to the output of the second adder circuit 407b, 09a is a right channel external control type attenuation circuit whose input is connected to the output of the right channel external control type delay circuit, and 409b is a left channel external control type attenuation circuit whose input is connected to the output of the left channel external control type delay circuit. A circuit, 410a is a right channel power amplifier whose input is connected to the output of the right channel external control type attenuation circuit, and 410b is a left channel power amplifier whose input is connected to the output of the left channel external control type attenuation circuit, 411a is The input is the right channel power amplifier 4
10a is a right channel speaker, 411b is a left channel speaker whose input is connected to a left channel power amplifier 408b, 412a is a right sensor attached to the upper part of the right channel speaker 411a, 41
2b is a left sensor attached to the upper part of the left channel speaker 411b, and 413 is a right channel speaker 411.
a and a listener 414 located in front of the left channel speaker 411b, the input is connected to the right sensor 412a and the left sensor 412b and the output is an externally controlled right channel delay circuit 408a, left channel delay circuit 408b,
A controller 415 connected to the right channel attenuation circuit 409a and the left channel attenuation circuit 409b is a ROM whose input and output are connected to the controller 414.

Next, the operation of the fourth embodiment will be described. The right sensor 412a and the left sensor 412b are sensors that detect in which direction the listener 413 is, for example, a television camera combined with an image processing device. The angle of the listener 413 viewed from the right sensor 412a and the left sensor 412b is input to the controller 414. The controller 413 calculates the position of the listener 413 from the distance between the right sensor 412a and the left sensor 412b which is input in advance. Sound is 344 m / in air
It propagates at s (20 ° C.) and its amplitude is inversely proportional to the square of the distance. The controller 414 determines the distance D _r from the right channel speaker 411a to the listener 413 and the calculated distance D ₁ from the left channel speaker 411b to the listener 413 to the outside of the right channel according to the distance difference (D _r −D _l ). The delay amount of the control type delay circuit 408a and the left channel external control type delay circuit 408b is controlled, and the right channel external control type attenuating circuit 409a and the left channel external side are inversely proportional to the square of the distance ratio (D _r / D _l ). It controls the amount of attenuation of the control type attenuation circuit 409b.

Right surround channel output terminal 401a
Signal is divided into two, one of which is the first adder circuit 407.
a, the right channel external control type delay circuit 408a, the right channel external control type attenuation circuit 409a, the right channel power amplifier 410a, and the right channel speaker 411a, and propagates as a sound to the listener 413. The other is the first
Through a phase inversion circuit 402a and a first filter 403a, and is divided into two with a crossover frequency of about 600 Hz. The low-pass side is a first attenuation circuit 405a and the high-pass side is a first delay circuit 404a. Second through
Are mixed in the adder circuit 407b of FIG.
This signal is further fed to the left channel external control type delay circuit 4
08b, the left-channel external control type attenuation circuit 409b, the left-channel power amplifier 410b, and the left-channel speaker 411b are propagated as a sound to the listener 413.
The sound emitted from the left channel speaker 411b is compared with the sound emitted from the right channel speaker 411a. First adder circuit 407a and second adder circuit 40
For 7b and later, the right channel speaker 411a of the listener 413 and the left channel speaker 411b of the listener 413 are set to vertical 2
This is to compensate for the deviation from the bisector. Therefore, the first addition circuit 407a and the second addition circuit 40
Circuits up to 7b will be described. In the low frequency range, the first phase inversion circuit 402a and the first filter 40 are included in the circuit.
The low-pass section 3a and the first attenuation circuit 405a are additionally provided, and the amplitude is smaller by the amount of attenuation of the first attenuation circuit 405a in the opposite phase. Therefore, as shown in the graph of FIG. 2, the right surround channel signal is localized outside the speaker having the larger amplitude, that is, the right channel speaker 411a, depending on the amplitude ratio of the sounds reproduced from the left and right speakers. Also, in the high range, the first
The phase inversion circuit 402a, the high-pass part of the first filter 403a, and the first delay circuit 404a are redundant, and the delay time is delayed by the delay time of the first delay circuit 404a in the opposite phase. Therefore, as shown in the graph of FIG. 4, due to the time difference between the sounds reproduced from the left and right speakers, the speaker without delay, that is, the right channel speaker 411.
The sound image signal of the right surround channel is localized outside a.

The signal at the right channel output terminal 401b is
First addition circuit 407a, right channel external control type delay circuit 408a, right channel external control type attenuation circuit 409
a, the right channel power amplifier 410a, and the right channel speaker 411a, and propagates to the listener 413 as sound. Therefore, in the right channel signal, the sound image is localized at the position of the right channel speaker.

The signal from the center channel output terminal 401c is halved through the attenuator circuit 406 whose attenuation amount is ½.
Becomes the amplitude of. This signal is split into two, one is the first
Adder 407a, right channel external control type delay circuit 4
08a, the right channel external control type attenuation circuit 409a, the right channel power amplifier 410a, and the right channel speaker 411a, and propagates to the listener 413 as sound.
The other is a second addition circuit 407b, a left channel external control type delay circuit 408b, a left channel external control type attenuation circuit 409b, a left channel power amplifier 410b,
It propagates as a sound to the listener 413 via the left channel speaker 411b. The sound reproduced from the right channel speaker 411a and the left channel speaker 411b is
Although the sounds are not in-phase and in-amplitude, if the delay and attenuation due to the distance difference and distance ratio from the right channel speaker 411a and the left-channel speaker 411b to the listener 413 are taken into consideration, they are in-phase and in-amplitude at the position of the listener 413. Since it becomes a sound, the sound image of the center channel is localized at the center of the left and right speakers.

The signal at the left channel output terminal 401d is
Second adder circuit 407b, left channel externally controlled delay circuit 408b, left channel externally controlled attenuation circuit 409
b, the left channel power amplifier 410b, and the left channel speaker 411b to propagate to the listener 413. Therefore, the left-channel signal is localized in the sound image at the position of the left-channel speaker 411b.

Left surround channel output terminal 401e
Signal is divided into two, one of which is the second adder circuit 407.
b, a left channel external control type delay circuit 408b, a left channel external control type attenuation circuit 409b, a left channel power amplifier 410b, and a left channel speaker 411b, and propagates as a sound to a listener 413. The other is the second
Through the phase inversion circuit 402b and the second filter 403b with a crossover frequency of about 600 Hz, and the low-pass side is divided by the second attenuation circuit 405b and the high-pass side is formed by the second delay circuit 404b. Then, the signals are mixed by the second addition circuit 407a and become one signal again. This signal is further output to the right channel external control type delay circuit 408a and the right channel external control type attenuation circuit 409.
a, the right channel power amplifier 410a, and the right channel speaker 411a, and propagates to the listener 413 as sound. The sound emitted from the right channel speaker 411a is compared with the sound emitted from the left channel speaker 411b. Regarding the first addition circuit 407a and the second addition circuit 407b and thereafter, the right speaker 4 of the listener 413 is
This is for compensating for the deviation from the center of the left speaker 11a and the left speaker 411b. Therefore, the first addition circuit 407
Circuits up to a and the second adding circuit 407b will be described. In the low frequency range, the second phase inversion circuit 4 is included in the circuit.
02b, the low-pass part of the second filter 403b, and the second attenuator circuit 405b are additionally provided, and the second phase is reversed in the second phase.
The amplitude is small by the amount of attenuation of the attenuation circuit 405a. Therefore, as shown in the graph of FIG. 2, the left surround channel signal is localized outside the speaker with the larger amplitude, that is, the left channel speaker 411b, depending on the amplitude ratio of the sounds reproduced from the left and right speakers. In the treble range, the second phase inversion circuit 402b, the high-pass part of the second filter 403b, and the second delay circuit 4 are included in the circuit.
04b is added and is delayed by the delay time of the second delay circuit 404b in the opposite phase. For this reason, FIG.
As shown in the graph, due to the time difference between the sounds reproduced from the left and right speakers, the sound image of the left surround channel is localized outside the speaker without delay, that is, the left channel speaker 411b.

As described above, the first attenuation circuit 405a,
By optimally adjusting the attenuation amount of the second attenuating circuit 405b and the delay time of the first delay circuit 403a and the second delay circuit 403b, only two power amplifiers on the left and right, a speaker, and five power amplifiers are provided as in the conventional example. Sound image localization similar to that using the power amplifier and speaker of can be realized. Also, the delay times of the right channel external control type delay circuit 408a and the left channel external control type delay circuit 408b, and. By controlling the attenuation amounts of the right channel external control type attenuation circuit 409a and the left channel external control type attenuation circuit according to the position of the listener 413, the effect can be exhibited at a wider listening position than the conventional multi-channel sound reproducing device. .

In the fourth embodiment, the delay time of the right channel external control type delay circuit 408a and the left channel external control type delay circuit 408b and the right channel external control type attenuation circuit 409a, the left channel external control type attenuation circuit 4 are used.
Although the attenuation amount of 05b was externally controlled,
The same effect can be obtained even if the other is set as an external control type as a fixed value according to the listening range of 8.

Embodiment 5. FIG. 7 is a top view showing a multi-channel sound reproducing device according to a fifth embodiment of the present invention, and FIG.
[Fig. 8] is a sectional view showing a speaker unit according to a fifth embodiment of the present invention. In the figure, 501 is a 5-channel signal source,
501a is a right surround channel output terminal of the 5-channel signal source 501, and 501b is a 5-channel signal source 50.
1 is the right channel output terminal, 501c is the center channel output terminal of the 5-channel signal source 501, and 501d is the left channel output terminal of the 5-channel signal source 501.
01e is the left surround channel output terminal of the 5-channel signal source 501, 502a is the first phase inverting circuit whose input is connected to the right surround channel output terminal 501a, and 502b is the first phase inverter whose input is connected to the left surround channel output terminal 501e. 2 phase inversion circuit, 503a is a first filter for dividing the band whose input is connected to the output of the first phase inversion circuit 502a into two, 503b
Is a second filter for dividing the band whose input is connected to the output of the second phase inversion circuit 502b into two, 503
b is a second band division filter whose input is connected to the output of the second phase inversion circuit 502b, 504a is a first delay circuit whose input is connected to the high-pass output side of the first filter 503a, and 504b is an input Is a second delay circuit connected to the high-pass output side of the second filter 503b, 505a
Is a first attenuator circuit whose input is connected to the low-pass output side of the first filter 503a, 505b is a second attenuator circuit whose input is connected to the low-pass output side of the second filter 503b, and 506 is a center input Channel output terminal 50
The third attenuator circuit 507a connected to 1c is an output of the right surround channel output terminal 501a, an output of the right channel output terminal 501b, an output of the second delay circuit 504b, a second attenuator circuit 505b, and a third attenuator circuit. Attenuator circuit 506
507b is an output of the left surround channel output terminal 501e, an output of the left channel output terminal 501d, an output of the first delay circuit 504a, a first attenuation circuit 505a, and a third adder circuit 507b. Attenuation circuit 50
6 is a second adder circuit for adding the output of 6; 508a is a right channel external control delay circuit whose input is connected to the output of the first adder circuit 507a; and 508b is an input of the second adder circuit 507b. The left-channel external control type delay circuit connected to the output of the right channel, 509a is the right-channel external control type attenuation circuit whose input is connected to the output of the right-channel external control type delay circuit, and 509b is the left-channel external control type delay circuit. Left channel external control type attenuation circuit connected to output of delay circuit, 510a has right channel power amplifier whose input is connected to output of right channel external control type attenuation circuit, 510b has its input whose left channel is Weibu control type The left channel power amplifier 511a connected to the output of the attenuator circuit has its input connected to the right channel power amplifier 510a. Connection has been right channel speaker, 5
The input of 11b is a left channel power amplifier 508b.
Connected to the left channel speaker 512a is a right sensor attached to the upper part of the right channel speaker 511a, 512b is a left sensor attached to the upper part of the left channel speaker 511b, 513a is an external control attached to the lower part of the right channel speaker 511a. Mold right turntable 513b is left channel speaker 511b
Externally controlled left turntable, mounted under
514 is a listener located in front of the right channel speaker 511a and the left channel speaker 511b, and 515 is a right channel delay circuit 508 whose input is connected to the right sensor 512a and the left sensor 512b and whose output is an external control type.
a, a left channel delay circuit 508b, a right channel attenuating circuit 509a, a left channel attenuating circuit 509b, a controller 516 connected to the right turntable 513a and the left turntable 513b, and a ROM whose input / output is connected to the controller 515. .

Next, operation 5 of the embodiment will be described. The right sensor 512a and the left sensor 512b are sensors that detect whether the listener 513 is in the left or right direction, such as a television camera combined with an image processing device. Right sensor 512a and left sensor 512
The position of the listener 513 viewed from b is input to the controller 514. The controller 513 rotates the right turntable 513a and the left turntable 513b so that the listener 514 is located at the center of the right sensor 512a and the left sensor 512b. In the state of FIG. 7, the right sensor 512a detects that the listener 514 is on the right and sends the signal of the controller 515. The controller 515 receives the signal and rotates the right turntable 513a clockwise until the output of the sensor is in a state where the listener 514 is in front of the sensor. Further, the left sensor 512b outputs an output when the listener 514 is on the left, and the controller receiving the output outputs the output to the front of the listener 51.
The left turntable 513b is rotated counterclockwise until 4 is present. By this operation, the listener 514 is always positioned in front of the right channel speaker 511a and the left channel speaker 511b. The position of the listener 513 is calculated from the amount of rotation of the right turntable 512a and the left turntable 513b and the distance between the right sensor 512a and the left sensor 512b which is input in advance. Sound propagates in air at 344 m / s (20 ° C),
Its amplitude is inversely proportional to the square of the distance. Controller 51
5 is the calculated distance D _r from the right channel speaker 511 a to the listener 514, the left channel speaker 5
The distance difference (D _r from the distance D _l from 11b to the listener 514)
-D _l ), depending on the right channel external control type delay circuit 50
8a and the left channel external control type delay circuit 508b are controlled, and the right channel external control type attenuation circuit 509a is inversely proportional to the square of the distance ratio (D _r / D _l ).
And control the attenuation amount of the left channel external control type attenuation circuit 509b.

Right surround channel output terminal 501a
Signal is divided into two, one of which is the first adder circuit 507.
a, the right channel external control type delay circuit 508a, the right channel external control type attenuation circuit 509a, the right channel power amplifier 510a, and the right channel speaker 511a, and propagates as a sound to the listener 514. The other is the first
Through the phase inversion circuit 502a and the first filter 503a at a crossover frequency of about 600 Hz, the low-pass side is divided by the first attenuation circuit 505a and the high-pass side is divided by the first delay circuit 504a. Second through
Are mixed in the adding circuit 507b of FIG.
This signal is further fed to the left channel external control type delay circuit 5
08b, the left-channel external control type attenuation circuit 509b, the left-channel power amplifier 510b, and the left-channel speaker 511b are propagated as a sound to the listener 514.
The sound emitted from the left channel speaker 509b is compared with the sound emitted from the right channel speaker 509a. First adder circuit 507a and second adder circuit 50
For 7b and later, the right speaker 511 of the listener 514
This is for compensating the deviation from the center of a and the left speaker 511b. Therefore, circuits up to the first addition circuit 507a and the second addition circuit 507b will be described. In the low range, the first phase inversion circuit 50 is included in the circuit.
2a, the low-pass portion of the first filter 503a, and the first attenuating circuit 505a are redundant, and the amplitude is small in the opposite phase by the amount of attenuation of the first attenuating circuit 505a. Therefore, as shown in the graph of FIG. 2, the right surround channel signal is localized outside the speaker with the larger amplitude, that is, the right channel speaker 511a, depending on the amplitude ratio of the sounds reproduced from the left and right speakers. In the treble range, the first phase inversion circuit 502a, the high-pass part of the first filter 503a, and the first delay circuit 5 are included in the circuit.
04a is added and is delayed by the delay time of the first delay circuit 504a in the opposite phase. For this reason, FIG.
As shown in the graph, due to the time difference between the sounds reproduced from the left and right speakers, the right surround channel signal is localized outside the speaker without delay, that is, the right channel speaker 511a.

The signal at the right channel output terminal 501b is
First addition circuit 507a, right channel external control type delay circuit 508a, right channel external control type attenuation circuit 509
a, the right channel power amplifier 510a, and the right channel speaker 511a, and propagates to the listener 514 as sound. Therefore, in the right channel signal, the sound image is localized at the position of the right channel speaker.

The signal at the center channel output terminal 501c is halved through the attenuator circuit 506 whose attenuation amount is ½.
Becomes the amplitude of. This signal is split into two, one is the first
Adder 507a, right channel external control type delay circuit 5
08a, the right channel external control type attenuation circuit 509a, the right channel power amplifier 510a, and the right channel speaker 511a, and propagates as a sound to the listener 514.
The other is a second addition circuit 507b, a left channel external control type delay circuit 508b, a left channel external control type attenuation circuit 509b, a left channel power amplifier 510b,
It propagates as a sound to the listener 514 via the left channel speaker 511b. The sound reproduced from the right channel speaker 511a and the left channel speaker 511b is
Although they are not in-phase and in-amplitude sounds, considering the delay and attenuation due to the distance difference and the distance ratio from the right-channel speaker 511a and the left-channel speaker 511b to the listener 514, the same-phase and same-amplitude sound is obtained at the listener's 514 position. Since it becomes a sound, the sound image of the center channel is localized at the center of the left and right speakers.

The signal at the left channel output terminal 501d is
Second adder circuit 507b, left channel externally controlled delay circuit 508b, left channel externally controlled attenuation circuit 509
b, the left channel power amplifier 510b, and the left channel speaker 511b to propagate to the listener 514. Therefore, the left channel signal is localized in the sound image at the position of the left channel speaker 511b.

Left surround channel output terminal 501e
Signal is split into two, one of which is the second adder circuit 507.
b, left channel external control type delay circuit 508b, left channel external control type attenuation circuit 509b, left channel power amplifier 510b, left channel speaker 511b, and propagates to the listener 514 as sound. The other is the second
Through the phase inversion circuit 502b and the second filter 503b at a crossover frequency of about 600 Hz, the low-pass side is divided by the second attenuation circuit 505b, and the high-pass side is formed by the second delay circuit 504b. Then, the signals are mixed by the second adding circuit 507a and become one signal again. This signal is further output to the right channel externally controlled delay circuit 508a and the right channel externally controlled attenuation circuit 509.
a, the right channel power amplifier 510a, and the right channel speaker 511a, and propagates to the listener 514 as sound. The sound emitted from the right channel speaker 511a is compared with the sound emitted from the left channel speaker 511b. Regarding the first addition circuit 507a and the second addition circuit 507b and thereafter, the right speaker 5 of the listener 513.
This is for compensating the deviation from the center of 11a and the left speaker 511b. Therefore, the first addition circuit 507
Circuits up to a and the second adding circuit 507b will be described. In the bass range, the second phase inversion circuit 5 is included in the circuit.
02b, the low-pass section of the second filter 503b, and the second attenuator circuit 505b are additionally provided, and the second phase is reversed in the opposite phase.
The amplitude is small by the amount of attenuation of the attenuation circuit 505a. Therefore, as shown in the graph of FIG. 2, the left surround channel signal is localized outside the speaker having the larger amplitude, that is, the left channel speaker 511b, depending on the amplitude ratio of the sounds reproduced from the left and right speakers. In the treble range, the second phase inversion circuit 502b, the high-pass part of the second filter 503b, and the second delay circuit 5 are included in the circuit.
04b is added and is delayed by the delay time of the second delay circuit 504b in the opposite phase. For this reason, FIG.
As shown in the graph, due to the time difference between the sounds reproduced from the left and right speakers, the signal of the left surround channel is localized outside the speaker without delay, that is, the left channel speaker 511b.

As described above, by optimally adjusting the attenuation amounts of the first attenuator circuit, the second attenuator circuit, and the delay times of the first delay circuit 503a and the second delay circuit 503b, two left and right sides can be obtained. Similar to the conventional example, only the power amplifier and the speaker can realize sound image localization similar to that using the five power amplifiers and speakers. Also, the delay times of the right channel external control type delay circuit 508a and the left channel external control type delay circuit 508b, and. By controlling the attenuation amounts of the right channel external control type attenuation circuit 509a and the left channel external control type attenuation circuit according to the position of the listener 513, the effect can be exhibited in a wider listening position than in the conventional multi-channel reproducing device. Further, since the right turntable 513a and the left turntable 513b are provided below the right channel speaker 511a and the left channel speaker 511b, respectively, so that the speaker is always directed toward the listener, the speaker is originally positioned at any position. The characteristics of can be exhibited.

In the fifth embodiment, the delay time of the right channel external control type delay circuit 508a and the left channel external control type delay circuit 508b and the right channel external control type attenuating circuit 509a, the left channel external control type attenuating circuit 50.
Although the attenuation amounts of 5b are both externally controlled, the listener 508
The same effect can be obtained even if the other is set as an external control type as a fixed value according to the listening range of.

In the fifth embodiment, the sensor is mounted on the speaker, but the same effect can be obtained by housing the sensor inside the speaker cabinet as shown in FIG.

Embodiment 6 FIG. FIG. 10 is a top view showing a multi-channel sound reproducing device according to a sixth embodiment of the present invention. In the figure, 601 is a 5-channel signal source, 601
a is a right surround channel output terminal of the 5-channel signal source 601, 601b is a right channel output terminal of the 5-channel signal source 601, and 601c is a 5-channel signal source 6
01 center channel output terminal, 601d is the left channel output terminal of the 5-channel signal source 601, 601e
Is a left surround channel output terminal of the 5-channel signal source 601, 602a is a first phase inverting circuit whose input is connected to the right surround channel output terminal 601a, 60
2b has a left surround channel output terminal 601e
A second phase inversion circuit 603a, an input 603a is a first attenuator circuit whose input is connected to an output of the first phase inversion circuit 602a, and 603b is an input a second phase inversion circuit 602b.
A second attenuator circuit connected to the output of 604, a third attenuator circuit 604 whose input is connected to the center channel output terminal 601c, and 605a an output of the right surround channel output terminal 601a and an output of the right channel output terminal 601b. A first adder circuit for adding the outputs of the second attenuating circuit 603b and the third attenuating circuit 604, 605b is an output of the left surround channel output terminal 601e, an output of the left channel output terminal 601d, and the first attenuating circuit 603a. And the third
A second adder circuit for adding the output of the attenuator circuit 604 and the output of the first adder circuit 605a to the right channel variable delay circuit, 606b.
Is a left channel variable delay circuit whose input is connected to the output of the second adding circuit 605b, 607a is a right channel variable attenuating circuit whose input is connected to the output of the right channel variable delay circuit 606a, and 607b is its input. The left channel variable attenuator circuit connected to the output of the left channel variable delay circuit 606b, 608a the right channel power amplifier whose input is connected to the output of the right channel variable attenuator circuit 607a, and 608b the input of the left channel variable attenuator circuit. The left channel power amplifier connected to the output of 607b, 609a the right channel speaker whose input is connected to the right channel power amplifier 608a, 6
The input of the 09b is a left channel power amplifier 608b.
A left channel speaker 609a and a left channel speaker 609b connected to the right channel speaker 609a.
The listener is in the front position of.

Next, the operation of the sixth embodiment will be described. At the listening position, the listener 610 adjusts the right channel variable delay circuit 606a, the left channel variable delay circuit 606b, the right channel variable attenuation circuit 607a, and the left channel variable attenuation circuit 607b so that the sound image of the center channel is centered between the speakers. Adjust. By this operation, the attenuation amount and the delay time difference can be adjusted according to the transfer characteristics from the left and right speakers to the listening position.

Right surround channel output terminal 601a
Signal is divided into two, one of which is the first adder circuit 605.
a, right channel variable delay circuit 606a, right channel variable attenuation circuit 607a, right channel power amplifier 60
8a, the listener 6 through the right channel speaker 609a
10 propagates as a sound. The other is a first phase inversion circuit 602a, a first attenuation circuit 603a, a second addition circuit 605b, a left channel variable delay circuit 606b, a left channel variable attenuation circuit 607b, a left channel power amplifier 608b, a left channel speaker 609b. Propagates as a sound to the listener 610 via the. The sound radiated from the left channel speaker 609b is transmitted to the right channel speaker 60.
Compare with the sound emitted from 9a. First adder circuit 60
5a and the second adding circuit 605b and thereafter, it is for compensating the deviation from the vertical bisector of the right channel speaker 601a and the left channel speaker 601b of the listener 603, and the sound image of the center channel is first The first and second adder circuits 605a and 605a and 605a are adjusted so as to be localized in the center between the left and right speakers.
The signal coming to the input of 5b is the same as when the listener 610 is located at the center between the speakers. For this reason,
First addition circuit 605a and second addition circuit 605b
The circuit up to is described. On the circuit, the first phase inversion circuit 602a and the first attenuation circuit 603a are redundant, and the amplitude is small in the opposite phase by the attenuation amount of the first attenuation circuit 603a. Therefore, as shown in the graph of FIG. 2, depending on the amplitude ratio of the sounds reproduced from the left and right speakers, the speaker with the larger amplitude, that is, the right channel speaker 60.
The signal of the right surround channel is localized on the outside of 9a.

The signal at the right channel output terminal 601b is
First adder circuit 605a, right channel variable delay circuit 6
06a, right channel variable attenuation circuit 607a, right channel power amplifier 608a, right channel speaker 60
It propagates as a sound to the listener 610 via 9a. Therefore, the right channel signal is transmitted to the right channel speaker 61.
The sound image is localized at the 0 position.

The signal at the center channel output terminal 601c is halved through the attenuator circuit 604 whose attenuation amount is ½.
Becomes the amplitude of. This signal is split into two, one is the first
Adder circuit 605a, right channel variable delay circuit 606
a, right channel variable attenuation circuit 607a, right channel power amplifier 608a, right channel speaker 609a
Propagates as a sound to the listener 610 via the. The other propagates to the listener 610 as sound through the second addition circuit 605b, the left channel variable delay circuit 606b, the left channel variable attenuation circuit 607b, the left channel power amplifier 608b, and the left channel speaker 609b. The sounds reproduced from the right channel speaker 609a and the left channel speaker 609b are not sounds of the same phase and the same amplitude, but the right channel variable delay circuit 606a and the left channel variable delay circuit 606 are first localized in the center.
b, the right channel variable attenuating circuit 607a and the left channel variable attenuating circuit 607b are adjusted, so that they are localized in the center.

The signal at the left channel output terminal 601d is
Second adder circuit 605b, left channel variable delay circuit 6
06b, left channel variable attenuation circuit 607b, left channel power amplifier 608b, left channel speaker 60
Propagate to listener 610 via 9b. Therefore, the signal of the left channel is localized in the sound image at the position of the left channel speaker 609b.

Left surround channel output terminal 601e
Signal is split into two, one of which is the second adder circuit 605.
b, left channel variable delay circuit 606b, left channel variable attenuation circuit 607b, left channel power amplifier 60
8b, the listener 6 through the left channel speaker 609b
10 propagates as a sound. The other is a second phase inversion circuit 602b, a second attenuation circuit 603b, a second addition circuit 605a, a right channel variable delay circuit 606a, a right channel variable attenuation circuit 607a, a right channel power amplifier 608a, a right channel speaker 609a. Propagates as a sound to the listener 610 via the. The sound radiated from the right channel speaker 609a is transmitted to the left channel speaker 60.
Compare with the sound emitted from 9b. First adder circuit 60
5a and the second and subsequent addition circuits 605b are for compensating the deviation of the right channel speaker 609a and the left channel speaker 609b of the listener 610 from the vertical bisector. Therefore, the first addition circuit 60
The circuits up to 5a and the second adding circuit 605b will be described. In the circuit, the second phase inversion circuit 602b and the second attenuation circuit 603b are redundant, and the amplitude is small in the opposite phase by the attenuation amount of the second attenuation circuit 603a. Therefore, as shown in the graph of FIG. 2, the left surround channel signal is localized outside the speaker having the larger amplitude, that is, the left channel speaker 609b, depending on the amplitude ratio of the sounds reproduced from the left and right speakers.

As described above, the first attenuation circuit 603a,
By optimally adjusting the amount of attenuation of the second attenuation circuit 603b, it is possible to realize sound image localization similar to that using the five power amplifiers and speakers as in the conventional example even with only two power amplifiers on the left and right. . Further, the right channel variable delay circuit 606a and the left channel variable delay circuit 606
b delay time and right channel variable attenuation circuit 607
a, by adjusting the attenuation amount of the left channel variable attenuation circuit 607b according to the position of the listener 610, the effect can be exerted at a wider listening position than the conventional multi-channel sound reproducing device.

In the sixth embodiment, the right channel variable delay circuit 606a and the left channel variable delay circuit 60 are included.
Although the delay times of 6b are both variable, the same effect can be obtained by using either one as a fixed type.

In the sixth embodiment, the right channel variable attenuating circuit 607a and the left channel variable attenuating circuit 607b both have variable attenuation amounts, but the same effect can be obtained by using one of them as a fixed type.

Embodiment 7 11 is a top view showing a multi-channel sound reproducing device according to a seventh embodiment of the present invention. In the figure, 701 is a 5-channel signal source, 701
a is a right surround channel output terminal of the 5-channel signal source 701, 701b is a right channel output terminal of the 5-channel signal source 701, and 701c is a 5-channel signal source 7.
01 center channel output terminal, 701d is a left channel output terminal of the 5-channel signal source 701, 701e
Is a left surround channel output terminal of the 5-channel signal source 701, 702a is a first phase inverting circuit whose input is connected to the right surround channel output terminal 701a, 70
2b has a left surround channel output terminal 701e
A second phase inverting circuit 703a connected to the first phase inverting circuit 703a, a first delay circuit 703a having an input connected to the output of the first phase inverting circuit 702a, and a second phase inverting circuit 702b having an input 703b.
A second delay circuit connected to the output of 701, an attenuator circuit 704 whose input is connected to the center channel output terminal 701c, and a reference numeral 705a of a right surround channel output terminal 701.
The output of a and the output of the right channel output terminal 701b and the second
A first adder circuit for adding the outputs of the third attenuating circuit 703b and the third attenuating circuit 704, and 705b, an output of the left surround channel output terminal 701e, an output of the left channel output terminal 701d, a first attenuating circuit 703a, and the first attenuating circuit 703a. A second adder circuit 70 for adding the output of the attenuation circuit 704
6a is a right channel variable delay circuit whose input is connected to the output of the first adder circuit 705a, 706b is a left channel variable delay circuit whose input is connected to the output of the second adder circuit 705b, and 707a is its The right channel variable attenuator circuit whose input is connected to the output of the right channel variable delay circuit 706a, 707b is its left channel variable attenuator circuit whose input is connected to the output of the left channel variable delay circuit 706b, and 708a is its right channel input The right channel power amplifier connected to the output of the variable attenuation circuit 707a, 708b the left channel power amplifier whose input is connected to the output of the left channel variable attenuation circuit 707b, and 709a the right channel power amplifier 7 whose input is
Reference numeral 709b is a left channel speaker connected to the left channel power amplifier 708b, and 710 is a listener in front of the right channel speaker 709a and the left channel speaker 709b.

Next, the operation of the seventh embodiment will be described. At the listening position, the listener 710 adjusts the right channel variable delay circuit 706a, the left channel variable delay circuit 706b, the right channel variable attenuation circuit 707a, and the left channel variable attenuation circuit 707b so that the center channel sound image is centered between the speakers. Adjust. By this operation, the attenuation amount and the delay time difference can be adjusted according to the transfer characteristics from the left and right speakers to the listening position.

Right surround channel output terminal 701a
Signal is divided into two, one of which is the first adder circuit 705.
a, right channel variable delay circuit 706a, right channel variable attenuation circuit 707a, right channel power amplifier 70
8a, the listener 7 through the right channel speaker 709a
10 propagates as a sound. The other is a first phase inversion circuit 702a, a first delay circuit 703a, a second addition circuit 705b, a left channel variable delay circuit 706b, a left channel variable attenuation circuit 707b, a left channel power amplifier 708b, a left channel speaker 709b. Propagates as a sound to the listener 710 via the. The sound radiated from the left channel speaker 709b is transmitted to the right channel speaker 70.
Compare with the sound emitted from 9a. First adder circuit 70
5a and the second adder circuit 705b and thereafter, it is for compensating the deviation from the vertical bisector of the right channel speaker 701a and the left channel speaker 701b of the listener 703, and the sound image of the center channel is first The first and second adder circuits 705a and 705a and 705a are adjusted so that they are localized in the center between the left and right speakers.
The signal coming to the input of 5b is the same as when the listener 710 is located in the center between the speakers and listens. For this reason,
First addition circuit 705a and second addition circuit 705b
The circuit up to is described. The first phase inversion circuit 702a and the first delay circuit 703a are redundant in the circuit, and the signal is delayed by the delay time of the first delay circuit 703a in the opposite phase. For this reason, since sounds with a time difference are reproduced from the left and right speakers shown in the graph of FIG. 4, the speaker without delay, that is, the right channel speaker 709.
The sound image signal of the right surround channel is localized outside a.

The signal at the right channel output terminal 701b is
First adder circuit 705a, right channel variable delay circuit 7
06a, right channel variable attenuation circuit 707a, right channel power amplifier 708a, right channel speaker 70
The sound propagates to the listener 710 via 9a. Therefore, the right channel signal is transmitted to the right channel speaker 71.
The sound image is localized at the 0 position.

The signal from the center channel output terminal 701c is halved through the attenuator circuit 704 whose attenuation amount is ½.
Becomes the amplitude of. This signal is split into two, one is the first
Adder circuit 705a, right channel variable delay circuit 706
a, right channel variable attenuation circuit 707a, right channel power amplifier 708a, right channel speaker 709a
Propagates as a sound to the listener 710 via the. The other propagates as a sound to the listener 710 via the second addition circuit 705b, the left channel variable delay circuit 706b, the left channel variable attenuation circuit 707b, the left channel power amplifier 708b, and the left channel speaker 709b. Sounds reproduced from the right channel speaker 709a and the left channel speaker 709b are not sounds of the same phase and the same amplitude, but the right channel variable delay circuit 706a and the left channel variable delay circuit 706 are first localized in the center.
b, the right channel variable attenuating circuit 707a and the left channel variable attenuating circuit 707b are adjusted, so that they are localized in the center.

The signal at the left channel output terminal 701d is
Second adder circuit 705b, left channel variable delay circuit 7
06b, left channel variable attenuation circuit 707b, left channel power amplifier 708b, left channel speaker 70
Propagate to listener 710 via 9b. Therefore, the signal of the left channel is sound image localized at the position of the left channel speaker 709b.

Left surround channel output terminal 701e
Signal is divided into two, one of which is the second adder circuit 705.
b, left channel variable delay circuit 706b, left channel variable attenuation circuit 707b, left channel power amplifier 70
8b, the listener 7 through the left channel speaker 709b
10 propagates as a sound. The other is a second phase inversion circuit 702b, a second delay circuit 703b, a second addition circuit 705a, a right channel variable delay circuit 706a, a right channel variable attenuation circuit 707a, a right channel power amplifier 708a, a right channel speaker 709a. Propagates as a sound to the listener 710 via the. Sound radiated from the right channel speaker 709a is transmitted to the left channel speaker 70
Compare with the sound emitted from 9b. First adder circuit 70
5a and the second addition circuit 705b and subsequent components are for compensating the deviation of the right channel speaker 709a and the left channel speaker 709b of the listener 710 from the vertical bisector. Therefore, the first adder circuit 70
The circuits up to 5a and the second adding circuit 705b will be described. The second phase inversion circuit 702b and the second delay circuit 703b are additionally provided on the circuit, and the signal is delayed by the delay time of the second delay circuit 703a in the opposite phase. For this reason, since sounds with a time difference are reproduced from the left and right speakers shown in the graph of FIG. 4, the right surround channel signal is localized outside the speaker without delay, that is, the right channel speaker 709a.

As described above, the first delay circuit 703a,
By optimally adjusting the delay time of the second delay circuit 703b, the sound image localization similar to that using the five power amplifiers and the speakers can be realized with only the two power amplifiers and the speakers on the left and right as in the conventional example. . In addition, the right channel variable delay circuit 706a and the left channel variable delay circuit 70
6b delay time and right channel variable attenuation circuit 707
a, by adjusting the attenuation amount of the left channel variable attenuation circuit 707b according to the position of the listener 710, the effect can be exhibited at a wider listening position compared to the conventional multi-channel sound reproducing device.

In the seventh embodiment, the right channel variable delay circuit 706a and the left channel variable delay circuit 70 are arranged.
Although the delay times of 6b are both variable, the same effect can be obtained by using either one as a fixed type.

In the seventh embodiment, both the right channel variable attenuator circuit 707a and the left channel variable attenuator circuit 707b have variable attenuation amounts, but the same effect can be obtained by using one of them as a fixed type.

[0087]

Since the present invention is configured as described above, it has the following effects.

Since the surround channel signal is reproduced by the corresponding front speaker, and the surround channel signal is phase-inverted and attenuated and reproduced by the opposite front channel speaker, the power amplifiers and speakers for the left and right two channels are reproduced. You can enjoy multi-channel sound field playback only.

Since the surround channel signal is reproduced by the corresponding front speaker and the surround channel signal is phase-inverted and time-delayed and reproduced by the opposite front channel speaker, the power of the left and right two channels is increased. You can enjoy multi-channel sound field playback only with an amplifier and speakers.

Also, the surround channel signal is reproduced by the corresponding front speaker, and the surround channel signal is phase-inverted to attenuate a part of the band and then
Since the partial band is time-delayed and reproduced by the opposite front channel speaker, the multi-channel sound field reproduction can be enjoyed only by the power amplifiers and speakers for the left and right two channels.

Also, the surround channel signal is reproduced by the corresponding front speaker, and the surround channel signal is phase-inverted to attenuate a part of the band and then
Part of the band is time-delayed and played back on the opposite front channel speaker, and the left and right channel signals are time-delayed and attenuated according to the listener's position. In addition to being able to enjoy sound field reproduction, listening on the front of the speaker can produce the same stereo effect as listening on the vertical bisectors of the left and right speakers.

Further, the surround channel signal is reproduced by the corresponding front speaker, and the surround channel signal is phase-inverted to attenuate a part of the band and then
The band of the section is time-delayed and reproduced by the opposite front channel speaker, and the left and right channel signals are time-delayed and attenuated according to the listener's position, and the speaker is oriented toward the listener. , You can enjoy multi-channel sound field reproduction only with power amplifiers and speakers for left and right 2 channels, and stereo effect similar to listening to the speakers on the vertical bisector of the left and right 2 speakers. Obtainable.

Further, the surround channel signal is reproduced by the corresponding front speaker, the surround channel signal is phase-inverted and attenuated to be reproduced by the opposite front channel speaker, and the left and right channels are variable delay circuits. Since a variable attenuation circuit is provided, it is possible to enjoy multi-channel sound field reproduction in a wide service area only with power amplifiers and speakers for the left and right two channels.

Further, the surround channel signal is reproduced by the corresponding front speaker, the surround channel signal is phase-inverted and time delayed to be reproduced by the opposite front channel speaker, and the left and right channels are variable-delayed. Since the circuit and the variable attenuation circuit are provided, 2
You can enjoy multi-channel sound field playback in a wide service area only with power amplifiers and speakers for each channel.

[Brief description of drawings]

FIG. 1 is a top view showing a multi-channel sound reproducing device according to a first embodiment of the present invention.

FIG. 2 is a sound image localization direction- (left channel level / right channel level) relationship diagram that complements the first embodiment of the present invention.

FIG. 3 is a top view showing a multi-channel sound reproducing device according to a second embodiment of the present invention.

FIG. 4 is a relationship diagram of a sound image localization direction-left and right channel delay time difference, which complements the second embodiment of the present invention.

FIG. 5 is a top view showing a multi-channel sound reproducing device according to a third embodiment of the present invention.

FIG. 6 is a top view showing a multi-channel sound reproducing device according to a fourth embodiment of the present invention.

FIG. 7 is a top view showing a multi-channel sound reproducing device according to a fifth embodiment of the present invention.

FIG. 8 is a side sectional view showing a speaker unit according to a fifth embodiment of the present invention.

FIG. 9 is a side sectional view showing another form of the speaker unit according to the fifth embodiment of the present invention.

FIG. 10 is a top view showing a multi-channel sound reproducing device according to a sixth embodiment of the present invention.

FIG. 11 is a top view showing a multi-channel sound reproducing device according to a seventh embodiment of the present invention.

FIG. 12 is a top view showing a conventional multi-channel sound reproducing device.

[Explanation of symbols]

102a, 102b, 202a, 202b, 302a,
302b, 402a, 402b, 502a, 502b,
602a, 602b, 702a, 702b Phase inversion circuit, 103a, 103b, 305a, 305b, 405
a, 405b, 505a, 505b, 603a, 603
b attenuation circuit, 203a, 203b, 304a, 304
b, 404a, 404b, 504a, 504b, 703
a, 703b delay circuit, 105a, 105b, 205
a, 205b, 307a, 307b, 407a, 407
b, 507a, 507b, 605a, 605b, 705
a, 705b Adder circuit, 408a, 408b, 508
a, 508b External control type delay circuit, 409a, 409
b, 509a, 509b External control type attenuation circuit, 412
a, 412b, 512a, 512b, 512c sensor, 513a, 513b, 513c turntable.

Claims (7)

[Claims] 1. An adder circuit for adding a surround channel signal to a front channel in the left-right direction in which the sound image is to be localized, a phase inverting circuit for inverting the phase of the surround channel signal, and an attenuating circuit for attenuating the signal, and A multi-channel sound reproducing device comprising: an adding circuit for adding to the front channel in the reverse direction. 2. An adder circuit for adding a surround channel signal to a front channel in the left-right direction where the sound image is to be localized, a phase inverting circuit for inverting the phase of the surround channel signal, and a delay circuit for delaying the signal, and A multi-channel sound reproducing device comprising: an adding circuit for adding to the front channel in the reverse direction. 3. An adder circuit for adding a surround channel signal to a front channel in the left-right direction in which the sound image is to be localized, a phase inverting circuit for inverting the phase of the surround channel signal, a filter for dividing the signal into two bands, and a band. A multi-channel sound reproducing device comprising: an attenuation circuit for attenuating a divided signal, a delay circuit for delaying the other band-divided signal, and an adder circuit for adding them to a forward channel in the reverse direction. 4. An adder circuit for adding a surround channel signal to a front channel in the left-right direction in which the sound image is to be localized, a phase inverting circuit for inverting the phase of the surround channel signal, a filter for dividing the signal into two bands, and a band. An attenuation circuit for attenuating the divided signal, a delay circuit for delaying the other band-divided signal, an adding circuit for adding them to the front channel in the opposite direction, and a variable delay circuit for at least one of the left and right channels. An attenuation circuit,
A multi-channel sound reproducing device having a sensor for detecting the direction of a listener, wherein the delay time and the attenuation amount of the variable delay circuit and the variable attenuation circuit are controlled according to the output of the sensor. 5. An adder circuit for adding a surround channel signal to a front channel in the left-right direction where the sound image is to be localized, a phase inverting circuit for inverting the phase of the surround channel signal, a filter for dividing the signal into two bands, and a band. An attenuation circuit for attenuating the divided signal, a delay circuit for delaying the other band-divided signal, an adding circuit for adding it to the front channel in the opposite direction, and a variable delay circuit for at least one of the left and right channels. An attenuation circuit, a sensor that detects the direction of the listener, and a turntable that rotates the speaker, and rotate the turntable according to the output of the sensor so that the speaker faces the direction of the listener. The delay time and the attenuation amount of the variable delay circuit and the variable attenuation circuit are controlled according to the rotation amount of the turntable. A multi-channel sound reproducing device characterized by the above. 6. An adder circuit for adding a surround channel signal to a front channel in the left-right direction where the sound image is to be localized, a phase inverting circuit for inverting the phase of the surround channel signal, and an attenuating circuit for attenuating the signal, and A multi-channel sound reproducing device comprising an adding circuit for adding to the front channel in the reverse direction, and a variable delay circuit and a variable attenuating circuit in at least one of the left and right channels. 7. An adder circuit for adding a surround channel signal to a front channel in the left-right direction where the sound image is to be localized, a phase inverting circuit for inverting the phase of the surround channel signal, and a delay circuit for delaying the signal, and a phase inverting circuit for delaying the signal. A multi-channel sound reproducing device comprising an adding circuit for adding to the front channel in the reverse direction, and a variable delay circuit and a variable attenuating circuit in at least one of the left and right channels.