JPH07222298A - Surround stereo - Google Patents

Abstract

PURPOSE:To provide the stereo, with which a distance and quality up to the sound image of a vocal signal is not changed but a signal excepting for vocal is provided with the new surround effect of the big effect of a horizontal spreading feeling, for audio for home use such as a system composition or a CD radio cassette tape recorder, television set or car audio. CONSTITUTION:Vocal cancel circuits 11 and 12 attenuate or erase the vocal signal contained in a two-channel input signal, and time delay circuits 13 and 14 delay the outputs of the vocal cancel circuits. Sound image locating direction control circuits 15 and 16 perform processing to localize the sound images outside left and right speakers in front of a listener, the delayed signals are respectively added by adder circuits 17 and 18 and reproduced through amplifier circuits 19 and 20 by speakers 23 and 24. On the other hand, the two-channel input signal is passed through amplifier circuits 21 and 22 and reproduced by speakers 9 and 10.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a system component and a CD.
The present invention relates to a surround stereo for a home audio device such as a radio cassette player, an AV device such as a television set, and a car audio device.

[0002]

2. Description of the Related Art FIG. 15 shows a conventional example of surround stereo. This example is disclosed in JP-A-53-33601.

The output signals S1 and S2 of the CD player or the like input from the input terminals 1 and 2 are branched by the 2-branching means, and one of the signals is input to the adder circuit 3 to be added signal S3. , The other signal of each is input to the first input terminals of the amplifiers 7 and 8 having a summing function.
The signal S3 is input to the time delay circuit 4 and becomes a signal S4 having a time delay. The signal S4 is branched by the 2-branching means, and the respective signals are reverberation generating circuits 5 and 6.
To the reverberant signals S5 and S6. The signals S5 and S6 are input to the second input terminals of the amplifiers 7 and 8, and become the signals S7 and S8 obtained by adding the input signals S1 and S2 and the signals S5 and S6 having time delay and reverberation.
The signals S7 and S8 are input to the speakers 9 and 10 and reproduced as sound.

According to the above publication, it is possible to achieve both localization of a sound source and a sense of sound field expansion in the best condition.

[0005]

However, this is possible only when the cross-correlation coefficient of the output signals S5 and S6 of the reverberation generating circuits 5 and 6 is zero. In many cases, the number of relations is not zero, and in that case, it is difficult to achieve both localization of the sound source and a sense of sound field expansion. In particular, in the vocal signals included in the signals S1 and S2 at the same phase and at the same level, the sound image is localized further than the distance from the listener to the speaker, and the quality is
1 and S2 have a drawback that they are changed as compared with the case where the speakers 9 and 10 are reproduced as they are.

In the present invention, in view of the above problems, the distance to the sound image of the vocal signal is localized at the distance from the listener to the speaker, as in the case where the signals S1 and S2 are reproduced as they are on the speakers 9 and 10. The present invention provides a surround stereo system in which the quality of vocal signals does not change and signals other than vocal signals have a feeling of spreading.

[0007]

In order to solve the above problems, the present invention provides first and second vocal canceling means for attenuating or canceling a vocal signal included in a 2-channel input signal, and the first vocal canceling means. , First and second delaying the output signals of the second vocal cancellation means, respectively
And a first sound image localization direction control device that receives the output signal of the first time delay device as input and localizes a sound image outside the front left speaker of the listener. Second sound image localization direction control means for inputting the output signal of the time delay means and localizing the input signal outside the front right speaker of the listener;
Of the first sound image localization direction control means, and a first addition means for adding the first output signal of the sound image localization direction control means and the first output signal of the second sound image localization direction control means. Second adding means for adding the second output signal and the second output signal of the second sound image localization direction control means, and first and second amplifying means for amplifying the two-channel input signals, respectively. And first and second speakers that reproduce the output signals of the first and second amplifying means, respectively, and third and fourth amplifiers that amplify the output signals of the first and second adding means, respectively. It is a surround stereo including means and third and fourth speakers that reproduce the output signals of the third and fourth amplifying means, respectively.

[0008]

The vocal canceling means in the above construction is for attenuating or erasing the vocal signals recorded in phase contained in the 2-channel input signal. In the bandpass filter circuit, the phase inversion circuit, and the adder that constitute the vocal canceling means, the bandpass filter circuit passes only the frequency band of the vocal signal included in one of the input signals. The phase of the output signal is inverted by the phase inverting circuit, and the other input signal is added by the adder to attenuate or eliminate the vocal signal. The time delay means not only increases the size of the reproduced sound field, but also creates a sense of horizontal expansion. The sound image localization direction control means performs processing so that the sound image is localized outside the front left speaker of the listener. The output signal and the input signal of the addition means and the sound image localization direction control means are added.

With the above configuration, the surround signal processing by the time delay means and the sound image localization direction control means is performed on signals other than vocal, and the distance and quality of the vocal signal to the sound image do not change, It is possible to provide a new surround effect in which signals other than vocal have a feeling of spreading.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A surround system according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of surround stereo according to an embodiment of the present invention. The same functions as those of the conventional example are designated by the same reference numerals.

The output signals S1 and S2 of the CD player or the like input from the input terminals 1 and 2 are branched by the 3-branching means, and the first and second signals of the signal S1 are the first signals of the vocal cancel circuit 11. An input terminal and a first input terminal of the vocal cancel circuit 12 are input, a signal S10 obtained by canceling the vocal signal is output, and the first and second signals of the signal S2 are the second input terminal of the vocal cancel circuit 12. Is input to the second input terminal of the vocal cancel circuit 11, and a vocal canceled signal S11 is output. The operation of the vocal cancel circuits 11 and 12 will be described below.

FIG. 3 is a block diagram of the vocal cancellation circuit. The signal S1 input from the input terminal 1 is input to the first input terminal of the adder circuit 31, and the signal S2 input from the input terminal 2 is input to the bandpass filter circuit 30. The bandpass filter circuit 30 uses the signal S2
Has a function of passing the vocal signal included in the input / output frequency characteristic, and its input / output frequency characteristic is 100% as shown in FIG.
It suffices to set the pass band from about Hz to about 2 KHz. The signal S30 that has become a signal mainly containing vocals by the bandpass filter circuit 30 is input to the phase inverting circuit 32 and becomes a signal S32 having an opposite phase, that is, a phase difference of 180 degrees. The signal S32 is input to the second input terminal of the adder circuit 31 and becomes the signal S10 obtained by subtracting only the vocal component from the signal component of the signal S1. The above is the configuration and operation of the vocal cancel circuit 11. The other vocal cancel circuit 12 uses the signal S2 input from the input terminal 2 as the input of the first input terminal of the adder circuit 31, and the signal S1 input from the input terminal 1 as the input of the bandpass filter circuit 30. Thus, as the output of the adder circuit 31, it is possible to obtain the signal S11 obtained by subtracting only the vocal component from the signal component of the signal S2.

The output signals S10 and S11 of the vocal cancel circuits 11 and 12 are input to the time delay circuits 13 and 14, and the signals S12 and S are delayed by several tens of milliseconds.
It becomes 13. The time delay circuit is usually an IC such as DRAM.
It may be configured using a memory. Time delay circuit 13, 1
No. 4 is necessary to further control the size of the reproduced sound field. Delaying the direct sound with time is equivalent to producing a reflected sound, and having a large time delay value means that the reflected sound is reflected. Takes a long time to reach the listener,
That is, it is equivalent to a large size of the reproduced sound field.

The signals S12 and S13 are input to the sound image localization direction control circuits 15 and 16, and the signals S14, S15, S16 and S17 are processed so that the sound images are localized outside the front left and right speakers of the listener. Becomes For example, if the sound image localization direction control circuit that processes so that the sound image is localized outside the front right speaker of the listener is 15, the output signals are S14 and S15, and the sound image is outside the front left speaker of the listener. If the sound image localization direction control circuit that processes to localize is 16, the output signals are S16 and S17.
Becomes This sound image localization direction control circuit can be realized, for example, by using the technique described in Japanese Patent Application No. 58-99097 previously filed by the present applicant. FIG. 2 shows an example of the sound image localization direction control circuit.

The signals S14 and S17 are added to the adder circuit 17
Are added to the first and second input terminals of the signal S18 and become the added signal S18.
The signal S19 is input to the first and second input terminals 8 and added. The signals S18 and S19 are respectively sent to the amplifier 1
Signals S20 and S2 input to 9 and 20 and power-amplified
It becomes 1 and is reproduced as a sound by the speakers 23 and 24.

The third signal branched into the signals S1 and S2 is input to the amplifiers 21 and 22 and becomes power-amplified signals S22 and S23, which are reproduced as sounds by the speakers 9 and 10.

In the first embodiment, the speaker 9,
In the signal reproduced in 10, the input signals S1 and S2 are reproduced as they are, and in the signals reproduced by the speakers 23 and 24,
The signal processed for the signal other than the vocal signal included in the input signals S1 and S2 is reproduced, the distance to the sound image of the vocal signal and the quality do not change, and the signal other than the vocal signal does not change. It is possible to provide a new surround effect with a sense of spaciousness.

FIG. 10 is a block diagram of surround stereo in the second embodiment of the present invention. The same functions as those of the embodiment of the present invention shown in FIG. 1 are designated by the same reference numerals.

In FIG. 10, description of the same functions as those of the embodiment of the present invention shown in FIG. 1 will be omitted. The output signals S10, S11 of the vocal cancel circuits 11, 12 are input to the time delay circuits 40, 41, and become a signal S40 delayed by several tens of milliseconds and a signal S41 further delayed by several tens of milliseconds. According to FIG. 11, the time delay circuit 4
0 and 41 are described in detail.

The time delay circuit 40 is composed of only the first time delay circuit 42, and the input signal S10 becomes a signal S40 having a time delay of several tens of milliseconds. On the other hand, the time delay circuit 41 includes a first time delay circuit 42 and a second time delay circuit 43, and the input signal S11 is a signal having a time delay of several tens of milliseconds and a time delay of several tens of milliseconds. S4
It becomes 1. That is, the signal S40 and the signal S41 are the second
The time delay circuit 43 has a time delay difference of several ten milliseconds.

Next, the operation of the time delay circuits 40 and 41 will be described in detail together with the operation of the vocal cancel circuits 11 and 12. The functions of the time delay circuits 40 and 41 not only further increase the size of the reproduced sound field by the time delay, but also create a feeling of expansion in the horizontal direction. The reason why the size of the reproduced sound field can be further increased by the time delay has already been explained.

Next, the reason why it is possible to create a feeling of expansion in the horizontal direction will be described. According to the paper "Correlation Coefficient of 2-Channel Acoustic Signal and Quality of Sound Image" by Kurosumi and Ogushi of the Acoustical Society of Japan Vol. 39, No. 4, there is a great relation between the correlation coefficient of 2-channel signal and the sense of spread. When the correlation coefficient is near zero, the feeling of expanse is maximum, when the correlation coefficient is near 1, the feeling of expanse is minimum, and when the correlation coefficient is near -1, the feeling of expanse is small and the sound image is perceived in the vicinity of the listener. Then it is reported.

That is, it is understood that the cross-correlation coefficient of the two-channel signals should be set to zero in order to create a feeling of expansion in the horizontal direction. Furthermore, from the definition of the correlation coefficient, the correlation coefficient can be replaced with the phase difference between the two channel signals. When the correlation coefficient is 1, it means that there is no phase difference, that is, the same phase. When the correlation coefficient is -1, it means that the phase difference is 180 degrees, that is, the opposite phase.

FIG. 5 shows the vocal cancel circuits 11 and 12.
Is the frequency characteristic of the phase difference between the output signals S10 and S11.

As shown in FIG. 5, when the pass band of the band pass filter circuit 30 is changed from 100 Hz to 2 KHz, the band pass filter pass band, that is, the vocal band has an opposite phase, and the other bands have a positive phase. Become. That is, it is difficult to create a feeling of expansion in the horizontal direction with the frequency characteristic of this phase difference. According to the present invention, by providing the time delay circuits 13 and 14 and making the delay times different, the vocal cancel circuit 1 shown in FIG.
By controlling the frequency characteristic of the phase difference between the output signals S10 and S11 of the first and the second output signals 12 and, as a result, the frequency characteristic of the cross-correlation coefficient changes, a surround stereo providing a horizontal spread feeling is provided. .

FIG. 6 is a frequency characteristic of the phase difference between the output signals S12 and S13, where T is the difference between the time delay circuits 13 and 14.

The frequency characteristic of the phase difference is from 0 degree to 3 degrees.
The characteristics are such that up to 60 degrees are repeated with a cycle of 1 / T, and the conditions that the phase difference is the same phase are that the frequency is 0, 1 / T, 2 /
In the case of T, ..., An integral multiple of 1 / T, the conditions for the opposite phase are that the frequency is 1 / 2T, 2 / 2T ,.
This is the case of an integral multiple of 1 / T.

FIG. 7 shows input signals S1 and S of the input terminals 1 and 2.
2 as the same signal, and the vocal cancellation circuits 13 and 14
2 is a frequency characteristic of the phase difference between the output signals S12 and S13 when the pass bands of the band pass filter of F1 and F2 are F1 and F2.

FIG. 7 particularly shows the case where the lower limit frequency F1 of the pass band of the band pass filter is set to be equal to 1 / 2T. As can be seen by comparing FIG. 6 and FIG. 7, the frequency characteristics of the phase difference in the frequency range of 0 to 1 / 2T are almost the same from 0 degree to 180 degrees.
Change between degrees.

FIG. 8 shows the output signals S12 and S1 when the difference in time delay between the time delay circuits 13 and 14 is 50 milliseconds.
3 is a frequency characteristic of the phase difference between the signal and the signal.

The frequency characteristic of the phase difference is from 0 degree to 3 degrees.
It has a characteristic of repeating up to 60 degrees at a cycle of 200 Hz,
The condition that the phase difference is the same phase is that the frequency is 0,200H
z, 400 Hz, ..., and an integral multiple of 200 Hz, and the opposite phase condition is that the frequency is 100 Hz, 3
00 Hz, ..., and an integral multiple of 200 Hz.

FIG. 9 shows the position between the output signals of the time delay circuits 13 and 14 when the time delay difference between the time delay circuits 13 and 14 is 50 milliseconds and the pass band of the bandpass filter is 100 Hz to 2 KHz. The frequency characteristic of the phase difference is shown.

As shown in FIG. 9, the phase difference has a frequency of 0.
From 100Hz to 100Hz, it becomes constant at 0 degree and 100H
At a frequency higher than z, the characteristic is that 0 to 360 degrees are repeated at a cycle of 200 Hz. Similarly, the correlation coefficient has a constant value of 1 in a frequency range of 0 to 100 Hz, and has a characteristic of repeating a range of 1 to -1 at a frequency of 200 Hz in a frequency higher than 100 Hz.

That is, by using the second embodiment of the present invention shown in FIG. 10, it is possible to make the correlation coefficient, which is one of the conditions for creating a feeling of expansion in the horizontal direction, zero at all frequencies. Although it can not be done, with a predictable periodicity, it is possible to make the correlation coefficient zero, the distance to the sound image of the vocal signal and the quality do not change, the signal other than vocal has a feeling of spreading, As compared with the embodiment of the present invention shown in FIG. 1, it is possible to provide a new surround effect in which the effect of the horizontal spread feeling is large.

FIG. 12 is a block diagram of surround stereo in the third embodiment of the present invention. The same functions as those of the first and second embodiments of the present invention shown in FIGS. 1 and 10 are designated by the same reference numerals.

In FIG. 12, description of the same functions as those of the embodiment of the present invention shown in FIG. 1 will be omitted. The third embodiment of the present invention shown in FIG. 12 is the same as the first and second embodiments.
While the vocal cancel circuit and the time delay circuit were composed of two channels, the contents were analyzed and as a result, the vocal cancel circuit was composed of the one-channel vocal cancel circuit 11 with almost no deterioration in performance.
The time delay circuit is composed of a first time delay circuit 42 having a long time delay of several tens of milliseconds and a second time delay circuit 43 having a short time delay of several tens of milliseconds, and a phase inversion circuit 32 is added. It is a thing.

First, the vocal cancel circuits 11 and 12 having two channels in the first and second embodiments are set to 1
The reason why the channel vocal cancel circuit 11 is used will be described.

Table 1 shows the output signals S10 and S11 when the input signals S1 and S2 are input to the vocal cancel circuits 11 and 12 shown in FIG. 1 separately in the vocal band and other than the vocal band. is there.

[0040]

[Table 1]

That is, the output signals S10 and S11 are signals of the difference between the input signals in the vocal band and have a relationship of antiphase, and are the input signals themselves in the regions other than the vocal band. In the third embodiment of the present invention shown in FIG. 12, the vocal cancel circuit 11 and the phase inversion circuit 32 utilize the fact that the signals of the difference between the input signals have the opposite phase relationship in this vocal band. I configured it. In this case, the signals are different except in the vocal band, but the degree of deterioration of the surround performance does not often pose a practical problem depending on the type of the input signal.

Next, the time delay circuit includes a first time delay circuit 42 having a long time delay of several tens of milliseconds and a second time delay circuit 43 having a short time delay of several tens of milliseconds.
The reason for the configuration will be explained. As already described with reference to FIG. 11, the time delay circuit 40 is composed of the first time delay circuit 42 having a long time delay of several tens of milliseconds, and the time delay circuit 41 has the long time of several tens of milliseconds. It is configured by a first time delay circuit 42 having a delay and a second time delay circuit 43 having a short time delay of ten and several milliseconds. Since the output signal S50 of the vocal cancel circuit 11 in the third embodiment is of one channel, it is not necessary to equip two channels of the time delay circuit. Therefore, as shown in FIG. The first time delay circuit 42 having a long time delay of 2 seconds and its output signal S51 are branched into two, one signal is input as it is to the sound image localization direction control circuit 15, and the other signal is shortened to a few ten milliseconds or less. It can be realized by inputting to the second time delay circuit 43 having a time delay. In this case, it is not necessary to have two channels of time delay circuits having a long time delay of several tens of milliseconds, and there is an advantage that the cost becomes rational.

In FIG. 12, the phase inversion circuit 32
Is located after the second time delay circuit 43, that is, before the sound image localization direction control circuit 16, but may be located before the sound image localization direction control circuit 15 as a matter of course.

In the third embodiment, the speaker 9,
In the signal reproduced in 10, the input signals S1 and S2 are reproduced as they are, and in the signals reproduced by the speakers 23 and 24,
The signal processed for the signal other than the vocal signal included in the input signals S1 and S2 is reproduced, the distance to the sound image of the vocal signal and the quality do not change, and the signal other than the vocal signal does not change. It is possible to provide a new surround effect with a sense of spaciousness.

FIG. 13 is a block diagram of surround stereo in the fourth embodiment of the present invention. The same functions as those of the first, second and third embodiments of the present invention shown in FIGS. 1, 10 and 12 are designated by the same reference numerals.

In FIG. 13, description of the same functions as those of the embodiment of the present invention shown in FIG. 1 will be omitted. The fourth embodiment of the present invention shown in FIG. 13 is the same as the first and second embodiments.
The output signals S42 and S43 of the time delay circuits 13 and 14 are
The input signals S10 and S11 are respectively fed back. By feeding back the time delay of several tens of milliseconds, it is possible to artificially create a reverberation sound. By using the fourth embodiment of the present invention shown in FIG. 13, the distance to the sound image of the vocal signal and the quality do not change, and the effect of the horizontal expanse is great, as shown in FIGS. 1 and 10. As compared with the embodiment of the present invention, it is possible to provide a new surround effect in which a reverberation sound is added.

FIG. 14 is a block diagram of surround stereo in the fifth embodiment of the present invention. The same functions as those of the first to fourth embodiments of the present invention shown in FIGS. 1, 10, 12, and 13 are designated by the same reference numerals.

In FIG. 14, description of the same functions as those of the first embodiment of the present invention shown in FIG. 1 will be omitted. In the first to fourth embodiments, the amplifiers 21 and 22 and the speakers 9 and 10 are equipped to reproduce the input signals as they are, and the amplifiers 19 and 20 and the speakers 23 and 20 to reproduce the surround signals.
The fifth embodiment of the present invention shown in FIG. 14 has a two-channel amplifier 21 for reproducing the signal obtained by adding the input signal and the surround signal by the adder circuits 17 and 18 in contrast to the case where the amplifier 24 is provided. , 22 and speakers 9 and 10 are provided. In this case, since there are no speakers 23 and 24 dedicated to the surround signal reproduction, it is not possible to expect the effect of the reproduction direction of the speaker or the reproduction system for exhibiting the surround effect, or the addition circuits 17 and 18 input the input signal S1. S2 and surround signals S14 to S1
Since 7 is directly added, there is a concern that the sound quality of the input signal will deteriorate. However, the degree of deterioration of the surround performance and the deterioration of the sound quality of the input signal depend on the cost and surround effect of equipping a surround-only amplifier and speaker. It can be judged by comparing with. In the fifth embodiment, the signals reproduced by the two-channel speakers 9 and 10 are the input signals S1 and S2.
Is reproduced as it is, and a signal obtained by performing signal processing on a signal other than the vocal signal included in the input signals S1 and S2 is reproduced, so that the distance to the sound image of the vocal signal and the quality are changed. Instead, it is possible to provide a new surround effect in which signals other than vocal have a feeling of spreading.

The fifth embodiment is a simplification of the configuration after the adder circuit in the first embodiment. Similarly, in the second, third or fourth embodiment as well, the adder circuit and the following are added. It goes without saying that it is possible to simplify the configuration of the above-mentioned structure to obtain the sixth, seventh or eighth embodiment.

[0050]

As described above, the distance to the sound image of the vocal signal and the quality thereof do not change as compared with the normal two-channel reproduction, and the effect of expanding the horizontal direction of the signal other than the vocal becomes large. It can provide surround effect.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of surround stereo according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing an example of a sound image localization direction control circuit in FIG.

3 is a block diagram showing an example of the internal configuration of the vocal cancellation circuit in FIG.

FIG. 4 is a characteristic diagram showing frequency characteristics of the bandpass filter in FIG.

FIG. 5 is a characteristic diagram showing frequency characteristics of a phase difference between output signals S10 and S11 of the vocal cancellation circuits 11 and 12.

FIG. 6 shows output signals S12 and S12 of time delay circuits 13 and 14.
13 is a characteristic diagram showing the frequency characteristic of the phase difference between

FIG. 7 is a characteristic diagram showing frequency characteristics of phase difference between output signals S12 and S13 when the pass bands of the band pass filters of the vocal cancellation circuits 13 and 14 are F1 and F2.

8 shows output signals S12 and S12 of time delay circuits 13 and 14. FIG.
13 is a characteristic diagram showing the frequency characteristic of the phase difference between

9 is a characteristic diagram showing frequency characteristics of a phase difference between output signals of the time delay circuits 13 and 14. FIG.

FIG. 10 is a block diagram showing a configuration of surround stereo according to a second embodiment of the present invention.

11 is a block diagram showing an internal configuration example of a time delay circuit in FIG.

FIG. 12 is a block diagram showing a configuration of surround stereo according to a third embodiment of the present invention.

FIG. 13 is a block diagram showing a configuration of surround stereo according to a fourth embodiment of the present invention.

FIG. 14 is a block diagram showing the configuration of surround stereo according to a fifth embodiment of the present invention.

FIG. 15 is a block diagram showing a configuration of a surround stereo of a conventional example.

[Explanation of symbols]

 1, 2 Input terminals 3, 17, 18, 31 Adder 4, 13, 14, 42, 43 Time delay circuit 5, 6 Reverberation generation circuit 7, 8, 19, 20, 21, 22 Amplifier 9, 10, 23, 24 Speakers 11 and 12 Vocal Canceling Circuits 15 and 16 Sound Image Localization Direction Control Circuit 30 Band Pass Filter 32 Phase Inversion Circuit

Claims (8)

[Claims] 1. A first and a second vocal canceling means for respectively attenuating or eliminating a vocal signal contained in a two-channel input signal, and a first delaying an output signal of each of the first and second vocal canceling means. A second sound delay means, a first sound image localization direction control means for inputting an output signal of the first time delay means, and localizing the sound image outside the front left speaker of the listener. Second sound image localization direction control means for inputting an output signal of the second time delay means, and localizing the input signal to the outside of the front right speaker of the listener, and the first sound image localization direction control A first output signal of the means,
First adding means for adding the first output signal of the second sound image localization direction control means, and a second output signal of the first sound image localization direction control means,
Second adding means for adding the second output signal of the second sound image localization direction controlling means, first and second amplifying means for respectively amplifying the two-channel input signals, and the first , First and second speakers for reproducing the output signals of the second amplifying means, third and fourth amplifying means for amplifying the output signals of the first and second adding means, respectively, Surround stereo, comprising: third and fourth speakers for respectively reproducing output signals of the third and fourth amplifying means. 2. A first and second vocal cancellation means for attenuating or eliminating a vocal signal included in a two-channel input signal, and a first and a second delaying output signals of the first and second vocal cancellation means, respectively. Second time delay means, first sound image localization direction control means for inputting an output signal of the first time delay means, and localizing a sound image outside the front left speaker of the listener by the input signal, Second sound image localization direction control means for inputting the output signal of the second time delay means and for localizing the input signal to the outside of the listener's front right speaker; A first addition unit for adding the first input signal, the first output signal of the first sound image localization direction control unit, and the first output signal of the second sound image localization direction control unit; 2 h The second input signal of the channel input signals, the second output signal of the first sound image localization direction control means, and the second output signal of the second sound image localization direction control means are added. Second adding means, first and second amplifying means for amplifying output signals of the first and second adding means, respectively, and first for reproducing output signals of the first and second amplifying means, respectively. , Surround stereo with a second speaker. 3. Surround stereo according to claim 1, wherein the output signals of the first and second time delay means have different time delay values. 4. The surround stereo according to claim 1, wherein the first and second time delay means have a feedback circuit for adding the output signal to the input signal. 5. A vocal canceling means for attenuating or eliminating a vocal signal contained in a 2-channel input signal, and a first delaying an output signal of the vocal canceling means.
Time delay means, a second time delay means for branching the output signal of the first time delay means into two by the branch means, and delaying the first signal, and an output signal of the second time delay means. (Or the phase-inverting means for inverting the phase of the two-branched second signal), and the input of the two-branched second signal (or the output signal of the phase-inverting means), and inputting the input signal to the front of the listener. First sound image localization direction control means for localizing a sound image outside the left speaker, and an output signal of the phase inversion means (or an output signal of the second time delay means) as input, and the input signal is received by the listener. Second sound image localization direction control means for localizing a sound image to the outside of the front right speaker, and a first output signal of the first sound image localization direction control means,
First adding means for adding the first output signals of the second sound image localization direction control means, and a second output signal of the first sound image localization direction control means,
Second adding means for adding the second output signals of the second sound image localization direction control means, first and second amplifying means for amplifying the two-channel input signals, respectively, First and second speakers that respectively reproduce the output signals of the second amplifying means, third and fourth amplifying means that respectively amplify the output signals of the first and second adding means, and the third , And a third stereo speaker that reproduces the output signal of the fourth amplifying means, respectively. 6. A vocal canceling means for attenuating or canceling a vocal signal included in a 2-channel input signal, and a first delaying an output signal of the vocal canceling means.
Time delay means, a second time delay means for branching the output signal of the first time delay means into two by the branch means, and delaying the first signal, and an output signal of the second time delay means. (Or the phase-inverting means for inverting the phase of the two-branched second signal), and the input of the two-branched second signal (or the output signal of the phase-inverting means), and inputting the input signal to the front of the listener. First sound image localization direction control means for localizing a sound image outside the left speaker, and an output signal of the phase inversion means (or an output signal of the second time delay means) as input, and the input signal is received by the listener. Second sound image localization direction control means for localizing a sound image to the outside of the front right speaker, a first input signal of the two-channel input signals, and a first output of the first sound image localization direction control means. Signal and the second A first adding means for adding the first output signals of the sound image localization direction control means, a second input signal of the two-channel input signals, and a second input signal of the first sound image localization direction control means. Second output means for adding the second output signal of the second sound image localization direction control means and first output for amplifying the output signals of the first and second addition means, respectively. Surround stereo comprising: second amplification means; and first and second speakers that reproduce the output signals of the first and second amplification means, respectively. 7. The vocal cancellation circuit has a two-channel input terminal, and a first input terminal input to the first input terminal.
Signal is input to the first input terminal of the adding means, and the second signal input to the second input terminal is input to the bandpass filter means for passing only the frequency band component of the vocal signal, The output signal of the bandpass filter means is
5. The phase inverting means for inverting the phase of an input signal, and the output signal of the phase inverting means is input to the second input terminal of the adding means. Surround stereo described in crab. 8. When the lower limit frequency of the pass band of the band pass filter means is F and the value of the time delay difference between the output signals of the two time delay means is T, F = 1 / 2T. The surround stereo according to claim 7.