JP2001008300A - Method and device for reproducing multiple sound stereo - Google Patents

Abstract

PROBLEM TO BE SOLVED: To select a reproduction mode similar to simultaneous translation by outputting a sound selected as main reproduction from among multilingual sounds or main sound and sub-sound from a front channel and outputting a sound not to be selected from a rear channel. SOLUTION: An output is switched in accordance with a dual selection signal 6 by a main stereo selecting circuit 7 and in accordance with the states of a simultaneous surround output mode signal 10 and a dual selection signal 6 by a sub-stereo selecting circuit 11. Pieces of channel data 8, 9 of L and R in front of output of the selecting circuit 7 are switched in accordance with switching of the output. In addition, pieces of channel data 12, 13 of L and R in the rear direction of the output of the circuit 11 are switched in accordance with the signal 10. Thus, a new reproduction mode of dual stereo is provided by introducing the signal 10 and providing the circuit 11 and a reproducing state in a manner similar to simultaneous translation is formed in the case of bilingual stereo input. In addition, two languages are not simply or simultaneously reproduced, but the pieces of data are sorted to outputted channels so that sound field localization is clearly differentiated by the front and the rear directions by language.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital audio reproducing apparatus and the like, particularly to a digital audio reproducing apparatus having a surround component channel in addition to two front channels as an output. The present invention relates to a multi-channel sound reproducing method and a reproducing apparatus capable of inputting (main sound + sub sound) and selecting and outputting them.

[0002]

2. Description of the Related Art Conventional bilingual voices and two voices (main voice +
As an example of the playback device for the sub-sound, there is one as shown in FIG. This is dual monaural (monaural audio is in two languages) input.
One of channel 0 input signal 1 of the 0th language, channel 1 input signal 2 of the first language, dual input instruction signal 15 indicating that the input signal is dual monaural, and dual monaural input signal The dual monaural selection signal 14 selects the channel 0 input signal 1 or the channel 1 input signal 2 in accordance with the dual monaural selection signal 14, and outputs the selected signal. It is composed of front Lch data 8 and front Rch data 9 as signals.

As shown in FIG. 5, according to a dual input instruction signal 15 and a dual monaural selection signal 14,
It operates so that the front Lch data 8 and the front Rch data 9 selected as an output are switched.

In this example, when the dual input instruction signal 15 is 0 and it is not indicated that a dual monaural signal is input, the pair of the channel 0 input signal 1 and the channel 1 input signal 2 has a normal L / L signal. It is treated as R stereo and the front Lch data 8 and the front Rch data 9
It is distributed to. Dual input instruction signal 15 is 1
In the case where it is indicated that dual monaural is input, the channel data designated by the dual monaural selection signal 14 is selected, and after the gain adjustment, the front Lch data 8 and the front Rch data Sent as 9. Specifically, if the dual monaural selection signal 14 is 1, the channel 1 input signal 2 is selected, and it is reduced by 3 dB (x 0.707) by the gain adjustment.
h data 8 and forward Rch data 9 are sent out.

[0005] With this, even in the case of television broadcasting or the like, even if Japanese audio and English audio are stored in the location of stereo LR data together with the bilingual audio designation information, the listener selects the desired audio. It has become possible.

[0006]

Currently, the upper limit is that bilingual monaural and two voices (main voice + sub-voice) are stored in the location of stereo data and sent.
There is a movement to supply multilingual (two or more) stereo sounds in the future. Also about the sound reproduction environment,
The transition from the current stereo 2ch to a multi-channel sound system including rear (surround) speakers is gradually progressing.

In this situation, the multi-voice (main voice +
To provide a method of reproducing the first and second sub-audios) stereo and multi-language (two or more types) stereo, the conventional 2
Based on the concept of the playback method of a bilingual voice or two voices (main voice + sub-voice), a language is selected, or a main voice or a sub-voice is selected, and the voice not selected is not reproduced. Therefore, the multi-channel sound system cannot be effectively used.

[0008]

A sub-stereo selection circuit is provided before the surround channel output, and a simultaneous surround output mode is provided. When the simultaneous surround output mode indicates valid, multi-language audio or main audio is output. Among the + sub-audios, the audio selected as the main reproduction is output to the front channel, and the audio not selected as the main reproduction is selected by the sub-stereo selection circuit and output to the rear (surround) channel. like,
Assign audio data to output channels.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below.

FIG. 1 shows an example of a dual stereo selective reproducing apparatus. To explain the components together with their operation,
A channel 0 input signal 1, a channel 1 input signal 2, a channel 2 input signal 3, a channel 3 input signal 4, a dual input instruction signal 5 indicating that the input signal is dual stereo, and a dual stereo input signal A dual selection signal 6 for selecting a pair to be played back among them, and a simultaneous surround output mode signal 10 for instructing simultaneous output of a channel of dual stereo not designated as main to a rear channel.
And the dual input instruction signal 5 and the dual selection signal 6 are input, and when the dual input instruction signal 5 indicates validity, a pair of the channel 0 input signal 1 and the channel 1 input signal 2 or the channel 2 input signal 3 and the channel 3 Input signal 4
Main stereo selection circuit 7 for selecting and outputting the signal of the pair specified by dual selection signal 6 from the pair
And front L channel data 8 and front R channel data 9 which are output signals from the main stereo selection circuit 7,
The dual input instruction signal 5, the simultaneous surround output mode signal 10 and the dual selection signal 6 are input, and when the dual input instruction signal 5 indicates valid, and when the simultaneous surround output mode signal 10 indicates valid, the channel 0 input signal 1 A sub-stereo selector 11 for selecting and outputting a pair of the channel 1 input signal 2 or a pair of the channel 2 input signal 3 and the channel 3 input signal 4 which is not specified by the dual selection signal 6. And rear L channel data 12 and rear R channel data 13 which are output signals from the sub stereo selection circuit 11.

FIG. 3 shows the internal configuration of the sub-stereo selection circuit 11, and the configuration will be described together with the operation.

When the dual input instruction signal 5, the simultaneous surround output mode signal 10 and the dual selection signal 6 are input, and when the dual input instruction signal 5 indicates valid and the simultaneous surround output mode signal 10 indicates valid, the channel 0
A 0-th selection circuit 17 for selecting and outputting the signal which is not specified by the dual selection signal 6 among the input signal 1 or the channel 2 input signal 3, the dual input instruction signal 5 and the simultaneous surround output mode signal 10 And the dual selection signal 6 is input, and when the dual input instruction signal 5 indicates validity and the simultaneous surround output mode signal 10 indicates validity, the dual selection signal is selected from the channel 1 input signal 2 or the channel 3 input signal 4. 6 and a first selection circuit 18 for selecting and outputting the signal not specified.

Regarding the operation of the main stereo selection circuit 7 and the operation of the sub stereo selection circuit 11, the way of selecting an output channel when the dual input instruction signal 5 indicates validity is summarized in FIG. .

As shown in FIG. 4, the main stereo selection circuit 7 outputs the simultaneous surround output mode signal 10 according to the state of the dual selection signal 6.
The output is switched according to the state of the dual selection signal 6. When the dual selection signal 6 in FIG. 4 is 0, it indicates “0th channel pair selection”, and when it is 1, it indicates “first channel pair selection”. In accordance with this, the front L channel data 8 and the front R channel data 9 output from the main stereo selection circuit 7 are switched. Here, β in FIG. 4 is a coefficient of the output gain, and the examples of FIGS. 1 and 3 do not include an element for performing gain adjustment.
0.

The simultaneous surround output mode signal 10 in FIG. 4 indicates "normal selection" when 0, and "sub-side simultaneous surround output" when 1. Accordingly, the output of the sub-stereo selection circuit 11
The L channel data 12 and the rear channel data 13 are switched.

Thus, by introducing the simultaneous surround output mode 10 and providing the sub-stereo selection circuit 11, a new dual-stereo reproduction mode can be provided. Thus, when a bilingual stereo or the like is input, it is possible to create a simultaneous interpreting reproduction state. Further, instead of simply reproducing two languages simultaneously, data is allocated to output channels so that the sound field localization is clearly different between the front and the rear for each language.

As an easy-to-understand example, FIG. 6 shows how each channel data arrives from a speaker. FIG. 6 shows a front L channel (front_L) speaker 1
9, a front R channel (front_R) speaker 21, a front C channel (Center) speaker 20, a rear L channel (rear_L) speaker 22, a rear R channel (rear_R) speaker 23, and a listener 24 are shown. In this example, the dual selection signal 6 is 0, indicating that “0th channel pair selection” is instructed as the main. The 0th channel is output from the front L channel (front_L) speaker 19 and the front R channel (front_R) speaker 21.
Channel pair (L_1st, R_1st), rear L channel (rear_L) speaker 22 and rear R channel (rear_L)
R) The first channel pair (L_2nd,
R_2nd) is output.

It is well known that even if a plurality of kinds of sounds are sounding at the same sound pressure level, they can be distinguished if the arrival directions to the left and right ears are different. Considering the way in which the channel pair is transmitted to the listener, it can be said that a new service has become available without becoming harsh.

Here, a rear L channel (rear_L) speaker 22 and a rear R channel (rear_R) speaker 23
Regarding the case where sound is output from the sound source, etc., it is effective to add processing for lowering the sound pressure level than when sounding in front, in order to impress that the sound is not selected as main and is treated as sub.

The sub-stereo selection circuit 11 in this regard
Is shown in FIG. This example is different from the example of FIG.
A 0th gain adjustment circuit 25 which receives the dual input instruction signal 5, the simultaneous surround output mode signal 10 and the dual selection signal 6, changes the magnitude of the output of the 0th selection circuit 17 according to each of the input signals, and outputs A first gain adjustment circuit 26, which receives the input instruction signal 5, the simultaneous surround output mode signal 10 and the dual selection signal 6, and changes and outputs the magnitude of the output of the first selection circuit 18 according to each of the input signals, is added. Things. As for the gain value β which is a coefficient for changing the magnitude of the output of the 0th selection circuit 17 and the first selection circuit 18,

[0021]

[Equation 1] [Gain adjustment circuit output] = β * [Gain adjustment circuit input] (However, the absolute value of β is 1 or less) In this example, when the simultaneous surround output mode signal 10 in FIG. Adjustment circuit 25, first
If the gain value β of the gain adjustment circuit 26 is set to 0,
No output signal appears in the channel data 12 and the rear R channel data 13. Therefore, the presence / absence of simultaneous surround output of the channel data designated to the sub side can be set not by the switching process but by the difference of the gain value β.

Thus, the sub-side channel data can be output from the rear channel output at a low level. Typical values of the gain value β include 1.0, which is invariable in magnitude, 0.707, which is 3 dB down, 0.5, which halves the amplitude, and 0.0, which does not output. If the absolute value is 1 or less, various numerical values can be used.

FIG. 7 shows the sub-stereo selection circuit 11 for dual stereo. This is applied to an example in which channel data designated to the sub side can be simultaneously output from the rear channel even in dual monaural. 6.

FIG. 8 shows an example in which the channel 1 input signal 2 is added to the input of the 0th selection circuit 17 in FIG.
9, the first selection circuit 30 is obtained by adding the channel 0 input signal 1 to the input of the first selection circuit 18. Here, the dual input instruction signal 5 is a signal that also indicates whether two channels of the channel 0 input signal 1 and the channel 1 input signal 2 are dual monaural. Then, according to the dual input instruction signal 5, the channel 0 input signal 1
If it is indicated that the channel 1 and the channel 1 input signal 2 are input as dual monaural, the signal indicated by the dual selection signal 6 is distributed to the front channel and not indicated by the dual selection signal 6 The other signal is selected by the 0th selection circuit 29 and the first selection circuit 30, and the rear L channel data 1
2. It is allocated to the rear R channel data 13.

The channel switching method implemented in the example of FIG. 8 is shown in FIG. 9 only when the dual input instruction signal 5 indicates a dual monaural input. For the front channel, the gain value α for the signal indicated by the dual selection signal 6
Are sent to the front L channel and the front R channel. The gain value α is used to adjust the sound image localization and the sound pressure level, and is generally 0 ≦ | α | ≦
Use a real number α that satisfies 1.0.

On the other hand, similarly for the rear channel,
Since simultaneous output from the rear channel is monaural,
In order to adjust the sound image localization and the sound pressure level, it is usual to distribute the reduced level to the rear left and right.
For that, the same input channel is selected by the 0-th selection circuit 29 and the first selection circuit 30, and the 0-th gain adjustment circuit 25 is selected.
The first gain adjustment circuit 26 performs the level adjustment with the same gain value β. Where β is 0 ≤
Is a real number satisfying | β | ≦ 1.0.

FIG. 1 shows this example of how each channel data arrives from the speaker, as in FIG.
0. FIG. 10 shows a front virtual image C channel (phantom_center) 31 and a rear virtual image monaural channel (phantom_rear_mono) 32 in addition to the components shown in FIG. FIG. 10 shows the first monaural (mono_
1st) is a sub and the second monaural (mono_2nd) is selected. The first monaural is a front L channel (front_L) speaker 19 and a front R channel (fro).
nt_R) With the speaker 21, the second monaural is the rear L
Since the output is made by the channel (rear_L) speaker 22 and the rear R channel (rear_R) speaker 23,
The forward virtual image C channel (p
hantom_center) 31 and a rear virtual image monaural channel (phantom_rear_mono) 32 are perceived. Therefore, there is no problem even if the sub-side monaural sound is played on the rear channel.

The dual stereo is for two languages or two different pairs of stereos, but this is not the upper limit, and stereo inputs of three or more pairs can be considered.

FIG. 11 shows a sub-stereo selection circuit 11 to which the present invention is applied when three pairs of stereos are input.

The configuration of FIG. 11 will be described together with the operation.

When a multi audio channel pair is input, a channel 0 input and a channel 1 input forming a zero channel pair, a channel 2 input and a channel 3 input forming a first channel pair, and a second channel pair are formed. The channel 4 input and the channel 5 input are input signals, and the multi audio channel pair input instruction signal 37, the simultaneous surround output mode signal 10 and the sub pair selection signal 38 are input, and the multi audio channel pair input instruction signal 37 indicates valid. When the simultaneous surround output mode signal 10 indicates valid, the signal belonging to the channel pair specified by the sub-pair selection signal 38 among the channel 0 input signal 1, the channel 2 input signal 3, and the channel 4 input signal 5 is transmitted. A second selection circuit 33 for selecting and outputting, When the channel pair input instruction signal 37, the simultaneous surround output mode signal 10 and the sub-pair selection signal 38 are input, and when the multi audio channel pair input instruction signal 37 indicates valid and the simultaneous surround output mode signal 10 indicates valid, the channel 1 A third selection circuit 34 for selecting and outputting a signal belonging to the channel pair specified by the sub-pair selection signal 38 from the input signal 2 or the channel 3 input signal 4 or the channel 5 input signal 6;
A multi-audio channel pair input instruction signal 37, a simultaneous surround output mode signal 10 and a sub-pair selection signal 38 are input, and the second signal is input in accordance with the input signals 37, 10, and 38.
A second gain adjustment circuit 35 that changes the magnitude of the output of the selection circuit 33 and outputs the same;
And a third gain adjustment circuit 36 that changes the magnitude of the output of the selection circuit 34 and outputs the result.

With respect to the operation of the sub-stereo selection circuit 11, how to select an output channel when the multi audio channel pair input instruction signal 37 indicates validity is summarized in FIG.

FIG. 12 also shows how to select a pair of front channels according to a main pair selection signal indicating a channel pair to be sounded on the front channel as the main treatment.

As shown in FIG. 12, the sub-stereo selection circuit 11 switches the rear channel output according to the state of the simultaneous surround output mode signal 10 and the sub-pair selection signal 38. The sub-pair selection signal 38 in FIG.
A value of 0 indicates “0th channel pair selection”, a value of 1 indicates “first channel pair selection”, and a value of 2 indicates “second channel pair selection”.

Here, the 0th channel pair is a pair of L_1st input as a channel 0 input and R_1st input as a channel 1 input in FIG.
A channel pair is a pair of L_2nd input as a channel 2 input in FIG. 11 and an R_2nd input as a channel 3 input, and a second channel pair is an input as L_3rd and a channel 5 input as a channel 4 input in FIG. R_3rd.

The simultaneous surround output mode signal 10 in FIG. 12 indicates "normal selection" when 0, and "sub-side simultaneous surround output" when 1. Accordingly, the rear L channel data 12 and the rear R channel data 1 output from the sub stereo selection circuit 11 are output.
3 switches.

As described above, by introducing the simultaneous surround output mode 10 and providing the sub-stereo selection circuit 11, a new multi-audio stereo reproduction mode can be provided. Thereby, when a multi-language (three-language) stereo is input, in addition to the stereo of the language selected as the main, the stereo of the language selected as the sub is output by the rear channel, so that simultaneous interpretation is provided. You can create a playback situation. Also, instead of simply playing two languages simultaneously, the sound field localization is forward for each language,
Since the data is distributed to the output channels so as to be clearly different at the rear, it can be said that a new playback mode that can be used without being touched has become available.

[0038]

For example, it is possible to output a foreign language (original language) sound on the front channel and reproduce Japanese from behind the listener, and it is possible to select a new reproduction mode for simultaneous interpretation. In this case, since the sound field localization is clearly different between the front and the rear for each language, there is an advantage that even if two languages are reproduced simultaneously, both are easy to hear.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of a multi-audio stereo playback apparatus to which the present invention is applied.

FIG. 2 is a diagram showing an example of a conventional dual monaural audio playback device.

FIG. 3 is a diagram showing an example of a sub-stereo selection circuit included in a multi-audio stereo playback device to which the present invention is applied.

FIG. 4 is a diagram showing an example of channel selection in a multi-audio stereo reproduction method to which the present invention has been applied.

FIG. 5 is a diagram showing an example of conventional channel selection for dual monaural audio reproduction.

FIG. 6 is a diagram showing an example of how each channel data arrives from a speaker when the present invention is applied.

FIG. 7 is a diagram showing an example in which gain adjustment is possible in one embodiment of the sub-stereo selection circuit according to the present invention.

FIG. 8 is a diagram showing an example of an embodiment of the sub-stereo selection circuit according to the present invention, which can support dual monaural audio input.

FIG. 9 is a diagram showing an example of channel selection in a multi-audio stereo reproduction method to which the present invention is applied and which also supports dual monaural audio input.

FIG. 10 is a diagram showing an example of how each channel data arrives from a speaker when the present invention is applied and dual monaural audio input is supported.

FIG. 11 is a diagram showing an example in which three audio channel pairs are input in one embodiment of the sub-stereo selection circuit according to the present invention.

FIG. 12 is a diagram showing an example of channel selection in a multi-audio stereo reproduction method corresponding to three voices to which the present invention is applied.

[Explanation of symbols]

5 ... Dual input instruction signal, 6 ... Dual selection signal, 7
... Main stereo selection circuit, 10 ... Simultaneous surround output mode signal, 11 ... Sub stereo selection circuit, 17 ... No.
Selection circuit, 18: first selection circuit, 25: 0th gain adjustment circuit, 26: first gain adjustment circuit.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukio Fujii 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Multimedia Systems Development Division of Hitachi, Ltd. (72) Inventor Taku Nakamura Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa 292 Hitachi Multimedia Systems Development Division, Hitachi, Ltd. (72) Inventor Hiroaki Shirane 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture, Japan Hitachi Image Information Systems, Ltd. (72) Eiji Yamamoto, Eiji Yamamoto, Kodaira-shi, Tokyo 5-22-1, Mizumotocho F-term (reference) 5D062 BB03 5K068 BA06 CB21

Claims (10)

[Claims] 1. A plurality of audio channel data is input, and a main audio channel instruction signal for specifying which of the plurality of audio channel data is selected as a main output is input, and the main audio channel instruction signal indicates. A main audio channel selecting means for selecting and outputting the audio channel, wherein the audio channel output from the main audio channel selecting means is output as channel data located forward to a listener. Further inputting the plurality of audio channel data, and inputting a sub audio channel instruction signal indicating which one of the plurality of audio channel data is to be selected as a sub output;
Sub audio channel selection means for selecting and outputting the audio channel indicated by the sub audio channel instruction signal, wherein the audio channel output from the sub audio channel selection means is channel data located rearward to a listener. A multi-audio stereo playback device characterized by being output as a sound. 2. Inputting k audio channel pairs (k is a natural number of 2 or more) composed of a 0th audio channel and a first audio channel, and selecting any of the k audio channel pairs A main audio channel pair instruction signal for instructing whether to select the main output, and a main audio channel pair selecting means for selecting and outputting the audio channel pair indicated by the main audio channel pair instruction signal, The audio channel pair output from the main audio channel pair selecting means is a multi-audio reproducing device which is output as channel data positioned forward to the listener.
Input a sub audio channel pair instruction signal indicating which of the audio channel pairs is to be selected as the sub output,
Sub audio channel pair selection means for selecting and outputting the audio channel pair indicated by the sub audio channel pair instruction signal, wherein the audio channel pair output from the sub audio channel pair selection means is arranged backward to the listener. A multi-audio stereo playback device, which is output as channel data located at 3. A zero audio channel pair comprising a zero audio channel and a first audio channel;
And a first audio channel pair including a third audio channel and a third audio channel, and instructing which of the 0th audio channel pair and the first audio channel pair is to be selected as the main output. Main audio channel pair selecting means for receiving a main audio channel pair instruction signal, selecting and outputting the audio channel pair indicated by the main audio channel pair instruction signal, In the multi-sound reproduction apparatus in which the output sound channel pair is output as channel data positioned forward to the listener, a 0th sound channel and a first sound channel are further provided. An audio channel pair and a first audio composed of a second audio channel and a third audio channel Sub-audio channel pair selecting means for inputting a channel pair, inputting the main audio channel pair instruction signal, selecting and outputting the audio channel pair not indicated by the main audio channel pair instruction signal, An audio channel pair output from the sub audio channel pair selecting means is output as channel data located rearward to a listener. 4. The multi-audio stereo reproduction apparatus according to claim 1, wherein the audio channel pair output from said sub-audio channel pair selecting means is selected from the sub-audio channel pair selecting means. A multi-audio stereo reproduction apparatus characterized in that the input side is multiplied by a coefficient β (β is a real number whose absolute value is 1 or less) and the gain is adjusted to be less than the input magnitude. 5. The multi-audio stereo reproducing apparatus according to claim 4, wherein the coefficient β satisfies a condition of “0.0 ≦ β ≦ 1.0”. 6. A multi-audio stereo reproducing apparatus according to claim 4, wherein the coefficient β is selected from 0.0, 0.5, 0.707, and 1.0. . 7. A plurality of audio channel data is input, and main audio channel instruction information for specifying which of the plurality of audio channel data is to be selected as a main output is input, and the main audio channel instruction information indicates. In the multi-sound reproduction method of selecting the sound channel and outputting it as channel data positioned forward to a listener, further, inputting the plurality of sound channel data, and selecting one of the plurality of sound channel data Inputting sub audio channel instruction information indicating whether to select as a sub output, selecting the audio channel indicated by the sub audio channel instruction information, and outputting the selected audio channel as rearward channel data to a listener. A featured multi-audio stereo playback method. 8. An audio channel pair composed of a 0th audio channel and a first audio channel, k input channels (k is a natural number of 2 or more), and which of the k audio channel pairs is selected. Input the main audio channel pair instruction information instructing whether to select the main output, select the audio channel pair indicated by the main audio channel pair instruction information, and output it as channel data located forward to the listener. In the multi-audio reproduction method, the k audio channel pairs are input and
Input sub audio channel pair instruction information indicating which of the audio channel pairs is to be selected as the sub output,
A multi-audio stereo reproduction method, wherein the audio channel pair indicated by the sub-audio channel pair instruction information is selected and output as channel data located behind to a listener. 9. A zero audio channel pair comprising a zero audio channel and a first audio channel;
And a first audio channel pair including a third audio channel and a third audio channel, and instructing which of the 0th audio channel pair and the first audio channel pair is to be selected as the main output. A multi-audio reproducing method for inputting main audio channel pair instruction information, selecting the audio channel pair indicated by the main audio channel pair instruction information, and outputting the selected audio channel pair as channel data located forward to a listener. And a first audio channel pair composed of the zero audio channel and the first audio channel, and a first audio channel pair composed of the second audio channel and the third audio channel. And inputs the main audio channel pair instruction information, and the main audio channel pair instruction signal indicates A multi-audio stereo reproduction method characterized by selecting the audio channel pair that does not exist and outputting it as channel data located rearward to a listener. 10. The multi-audio stereo reproduction method according to claim 7, 8, or 9, wherein the audio channel pair selected as the sub audio channel pair further includes a coefficient β (β is an absolute value Is multiplied by a real number less than or equal to 1), the gain is adjusted to a value less than or equal to the input value, and then output as channel data located at the rear.