JPH1132398A - Duplication system, edit system and method for recording recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording medium that reproduces a surround sound of a rear channel in a duplication speaker system. SOLUTION: A duplication system is made up of a master reproducing device 1 that reproduces a medium on which a signal to obtain a surround sound effect is recorded, a surround decoder circuit 10a that decodes the surround signal, a sound image localization processing circuit 10d that applies time base convolution arithmetic processing to a rear channel signal, adders 10e, 10f that add the signal subject to the convolution arithmetic processing and stereo signals of 2 front channels, sound signal distributers 2, 3 that distribute signals outputted from the adders, and slave sets 5-1-5-n or the like that record the distribution signal to obtain a recorded medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a duplication system for producing a large number of recorded media such as video software or audio software from a recording medium serving as an original master, and a master used in the duplication system. The present invention relates to an editing system for creating a recorded medium.

[0002]

2. Description of the Related Art FIG. 12 is a schematic block diagram showing an example of a conventional video soft tape duplication system. This system distributes a master player 1 for playing a master recording medium such as a video tape, a video disk, an audio tape, and the like, and an audio signal and a video signal reproduced from a recording medium mounted on the player. , And slave units 5-1 for recording the audio and video signals supplied from these distribution devices on a recording medium such as an unrecorded tape or disk mounted thereon. , 5-n.

[0003]

By the way, recently,
In reproducing an audio signal, a signal in which a front two-channel stereo signal, a front one-channel center channel signal, and a rear one-channel monaural surround signal are converted into two channels and encoded, A signal in which a stereo signal, a center channel signal of one front channel, a stereo surround signal of two rear channels, or a low-frequency signal of one channel for a superwoofer is digitally compressed and encoded, and is decoded. By processing, separate and take out each independent channel,
A device for reproducing a more realistic surround sound has been proposed.

[0004] For example, even if a master tape recorded in such a predetermined form is made into a soft tape by the duplication system as described above, a reproduction system as shown in FIG. Required. That is, the speakers SP1 and S are provided on the left and right sides of the television 6 arranged in front of the listener M.
P2 is arranged, a center speaker SP5 is arranged at an intermediate position thereof, and speakers SP3 and SP4 for rear surround sound emission are arranged behind the listener M, and a surround decoder is built in each of these speakers. A configuration in which the amplifier 7 and the video deck 8 are connected is required.

However, in ordinary households, it is difficult to arrange the rear speakers SP3 and SP4 and the front center speaker SP5 in terms of space and cost, and in reality, as shown in FIG. Most systems are provided with only the left and right stereo speakers SP1 and SP2 built into a suitable television, and it has been difficult to expect the reproduction of the desired surround sound.

Accordingly, the present invention is directed to a system for creating a recording medium capable of reproducing a surround sound in which a sound image is localized behind in a system using only two front speakers used in a general household. When,
The present invention provides a recording medium created in such a system.

[0007]

The present invention, in order to solve the above problems, comprises the following means 1) to 24). That is,

1) Reproducing means for mounting and reproducing a recording medium on which at least a front two-channel stereo signal and a rear channel signal for obtaining a surround sound effect are recorded, and the reproducing means Decoding means for decoding the reproduced signal and extracting it as an independent channel signal, and sound image localization processing means for performing a convolution operation on the time axis for the rear channel signal extracted by the decoding means. Adding means for adding the signal subjected to the sound image localization processing and the front two-channel stereo signal extracted from the decoding means; distributing means for distributing the signal output from the adding means; Means for recording the signals respectively supplied from the means on the attached recording medium. Duplication system characterized by comprising a recording means.

[0009] 2) In the duplication system according to claim 1, the signal encoded on the recording medium includes at least a front two-channel stereo signal,
A duplication system, wherein a rear one-channel monaural signal for obtaining a surround sound effect is encoded in two channels, and the two-channel signals are extracted as independent channel signals during decoding. .

[0010] 3) In the duplication system according to claim 1, the signal encoded on the recording medium includes at least a front two-channel stereo signal,
A duplication system, wherein a rear two-channel stereo signal for obtaining a surround sound effect is digitally compressed and encoded, and at the time of decoding, the respective signals are taken out as independent channel signals.

4) playback means for mounting and playing back a recording medium in which at least a front two-channel stereo signal and a rear channel signal for obtaining a surround sound effect are recorded as independent channel signals; Sound image localization processing means for causing the rear channel signal reproduced by the reproduction means to perform a convolution operation on the time axis, and the sound image localization processed signal and the front two channel stereo reproduced by the reproduction means An adding unit for adding the signal, a distributing unit for distributing the signal output from the adding unit, and a plurality of recording units for recording the signal supplied from the distributing unit on the mounted recording medium. A duplication system comprising:

5) The duplication system according to claim 4, wherein the independent channel signal recorded on the recording medium is at least a front two-channel stereo signal and a rear one-channel monaural signal for obtaining a surround sound effect. A duplication system characterized by being a signal.

6) In the duplication system according to claim 4, the independent channel signal recorded on the recording medium is at least a front two-channel stereo signal and a rear two-channel stereo signal for obtaining a surround sound effect. A duplication system characterized by being a signal.

(7) In the duplication system according to any one of (1), (2), (3), (4), (5) and (6), the signal output from the adding means is compressed to a predetermined high-frequency level or the whole-area level in a subsequent stage of the adding means. A duplication system comprising a compressor means for performing processing.

8. The duplication system according to claim 1, wherein a limiter for limiting a predetermined high-frequency level of a signal output from the adding means is provided at a subsequent stage of the adding means. A duplication system comprising means.

9) In the duplication system according to claim 1, 2, 3, 4, 5, or 6, the stereo signal of the front two channels and the convolution operation processing on the time axis are performed before the adding means. Compressor means for performing a predetermined high-frequency level or whole-area level compression process on the rear channel signal thus selected, and detecting the levels of the front two-channel stereo signal and the rear channel signal to control the compressor means A duplication system comprising:

(10) The duplication system according to any one of (1), (2), (3), (4), (5) and (6), wherein the stereo signal of the front two channels and the convolution operation processing on the time axis are performed before the adding means. Limiter means for limiting a predetermined high-frequency level with the rear channel signal obtained, and control means for detecting the levels of the front two-channel stereo signal and the rear channel signal and controlling the limit means. A duplication system characterized by the following.

11) Reproduction means for mounting and reproducing a recording medium on which at least a front two-channel stereo signal and a rear channel signal for obtaining a surround sound effect are encoded, and the reproduction means Decoding means for decoding the reproduced signal and extracting each of the signals; sound image localization processing means for causing the rear channel signal extracted by the decoding means to perform a convolution operation on the time axis; Addition means for adding the processed signal and the front two-channel stereo signal extracted from the decoding means, and recording means for recording the signal output from the addition means on a mounted recording medium. Editing system consisting of:

(12) In the editing system according to the eleventh aspect, the signal encoded on the recording medium comprises at least two stereo signals in the front two channels and one monaural signal in the rear one channel for obtaining a surround sound effect. An editing system which is channelized and encoded, and extracts the two-channel signal as an independent channel signal at the time of decoding.

(13) In the editing system according to the eleventh aspect, the signals encoded on the recording medium include at least a front two-channel stereo signal and a rear two-channel stereo signal for obtaining a surround sound effect. An editing system, which has been compressed and encoded, and takes out each of the signals as an independent channel signal at the time of decoding.

14) reproducing means for mounting and reproducing a recording medium in which at least a front two-channel stereo signal and a rear channel signal for obtaining a surround sound effect are recorded as independent channel signals; Sound image localization processing means for performing a convolution operation on the time axis to the rear channel signal reproduced and supplied from the reproduction means; and a signal subjected to the sound image localization processing and reproduced and supplied from the reproduction means. An editing system comprising: adding means for adding the front two-channel stereo signal to the recording medium; and recording means for recording a signal output from the adding means on a mounted recording medium.

15) The editing system according to claim 14, wherein the signal of the independent channel recorded on the recording medium is at least a stereo signal of the front two channels,
An editing system, characterized in that it is a rear one-channel signal for obtaining a surround sound effect.

16) In the editing system according to claim 14, the signal of the independent channel recorded on the recording medium is at least a stereo signal of two front channels,
An editing system comprising: a rear two-channel signal for obtaining a surround sound effect.

17) reproducing the recorded signal from a recording medium on which at least a front two-channel stereo signal and a rear channel signal for obtaining a surround sound effect are encoded and recorded; and Decoding the extracted signals as independent channel signals and extracting the signals, performing convolution operation on the time axis for the extracted rear channel signals to perform sound image localization processing, and performing the sound image localization processing. Adding the decoded signal and the decoded front two-channel stereo signal, distributing the added signal to a plurality of recording means, and distributing the divided signal to the plurality of recording means. For producing a recording medium, comprising a step of recording on a recording medium mounted on the means.

18) reproducing the recorded signal from a recording medium on which at least a front two-channel stereo signal and a rear channel signal for obtaining a surround sound effect are recorded as independent channel signals; Performing a convolution operation on the time axis for the reproduced rear channel signal to perform a sound image localization process; and adding the reproduced sound image localization signal and the reproduced front two-channel stereo signal. And a step of distributing the added signals to a plurality of recording means, and recording the distributed signals on a recording medium mounted on the plurality of recording means.

19) reproducing the recorded signal from a recording medium in which at least a front two-channel stereo signal and a rear channel signal for obtaining a surround sound effect are encoded and recorded; Decoding the extracted signals as independent channel signals and extracting the signals, performing convolution operation on the time axis for the extracted rear channel signals to perform sound image localization processing, and performing the sound image localization processing. A method for producing a recording medium, comprising: a step of adding the decoded signal and the decoded two-channel front stereo signal, and a step of recording the added signal on a recording medium mounted on recording means.

20) reproducing the recorded signal from a recording medium in which at least a front two-channel stereo signal and a rear channel signal for obtaining a surround sound effect are recorded as independent channel signals; Performing a convolution operation on the time axis for the reproduced rear channel signal to perform a sound image localization process; and adding the reproduced sound image localization signal and the reproduced front two-channel stereo signal. And a step of recording these added signals on a recording medium mounted on the recording means.

21) Claim 17, 18, 19, or 20
The method for producing a recording medium according to any one of the preceding claims, further comprising, after the adding step, a processing step of compressing the added signal at a predetermined high frequency level or an entire level.

22) Claim 17, 18, 19, or 20
The method for producing a recording medium according to any of the preceding claims, further comprising, after the adding step, a processing step of limiting a predetermined high-frequency level of the added signal.

23) Claim 17, 18, 19, or 20
In the method for producing a recording medium according to the above, before the adding step, a predetermined high band level or whole band level compression of the front two channel stereo signal and the rear channel signal subjected to the convolution operation processing on the time axis is performed. When performing the compression processing, a processing step of detecting the level of the front two-channel stereo signal and the rear channel signal and determining the degree of compression is provided. How to create a recording medium.

24) Claim 17, 18, 19, or 20
In the method for producing a recording medium according to the above, before the adding step, a predetermined high-frequency level between the front two-channel stereo signal and the rear-channel signal subjected to the convolution operation processing on the time axis is limited, A recording step for detecting the level of the front two-channel stereo signal and the rear channel signal to determine the degree of restriction when performing the restriction. .

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to preferred embodiments. FIG. 1 is a schematic configuration diagram showing a first embodiment of the duplication system of the present invention. Note that the same components as those in the conventional example are denoted by the same reference numerals to facilitate understanding of the correspondence, and detailed description is omitted. In FIG. 1, reference numeral 1 denotes a master playback device, which outputs a video signal, an audio signal obtained by converting the above-described front two-channel stereo signal, front one-channel center channel signal, and rear one-channel monaural surround signal into two channels and encoding them. Is a playback machine on which a recording medium such as a video tape or a disc on which is recorded is mounted. It should be noted that, in the figure, a video signal processing system is actually provided at the subsequent stage of the master player 1 as in the conventional example of FIG. 12, but for simplicity of description,
Its disclosure is omitted.

The encoded two-channel signals Lt and Rt are reproduced from the recording medium mounted on the master reproducing device 1, and are output to the surround processing device 1 at the next stage.
0 is supplied. The surround processing device 10 includes a surround decoder circuit 10a, adder circuits 10b, 10c,
Sound image localization processing circuit 10d and addition circuits 10e and 10f
First, input signals Lt and Rt are supplied to the surround decoder circuit 10a.
The one-channel rear surround signal S is decoded and extracted. Center channel signal C
Are supplied to the adder circuits 10b and 10c, and are added to the left stereo signal L and the right stereo signal R supplied thereto, respectively, to obtain signals L 'and R'. The rear monaural signal S is supplied to the sound image localization processing circuit 10d.

FIG. 2 is a block diagram showing an example of the sound image localization processing circuit 10d. That is, the sound image localization processing circuit 10d shown in the figure performs a process to reproduce the surround sound from a pair of speakers arranged at a substantially symmetrical front position with respect to the listener based on the input of the rear surround signal S. In order to perform signal processing so that the pair of surround signals have no correlation with each other, a comb-shaped filter that generates a sum signal and a difference signal of a delay signal of the rear surround signal S and a signal before the delay is used. A pseudo-stereo processing unit having a sound image localization processing unit for localizing a sound image at a substantially symmetrical rear position with respect to a listener of a pair of surround sounds output from the pseudo-stereo processing unit, the pair of surround sounds having uncorrelation with each other It has.

Here, the pseudo-stereo processing unit adds the original surround signal S and the delay signal S 'to the delay circuit 10d-1 which applies a delay amount to the surround signal S and outputs the result as the delay signal S'. An adder 10d-2 for outputting the sum signal S + S ', and a delay signal S' for the original surround signal S
Adder 10d-3 that outputs a difference signal SS 'obtained by subtracting
And

Further, the sound image localization processing section includes an adder 10d which obtains an addition output of the sum signal and the difference signal output as a pair of surround signals from the pseudo stereo processing section.
4 and a subtractor 1 for obtaining a subtraction output of the sum signal and the difference signal thereof
0d-5 and a first filter 1 that receives the output of the adder 10d-4 and performs a convolution operation such as a convolver.
0d-6 and a second filter 1 which receives the output of the differentiator 10d-5 and performs a convolution operation such as a convolver.
0d-7, a differentiator 10d-8 for subtracting the first filter output and the second filter output, and an adder 10d-9 for adding the first filter output and the second filter output. ing.

Then, the first and second filters 10
The transfer characteristics P and N of d-6 and 10d-7 are as follows: P = (F + K) / (S + A) N = (FK) / (SA) (However, S is the same for a listener from a pair of speakers) A is the transfer characteristic from the pair of speakers to the listener and the opposite ear, F is the transfer function from the position where the surround signal is desired to be localized in the sound image to the ear on the same side of the listener,
K is set to the transfer function from the position where the surround signal is to be localized to the sound image to the ear on the opposite side of the listener), and the range of the surround reproduction can be set by setting the transfer function so that the sound image localization position has a certain width. It has been made like that.

In the configuration shown in FIG. 2, since the input surround sound S is a monophonic monaural signal, the input surround sound S is passed through a pseudo-stereo processing unit composed of a comb filter in order to decorrelate the input signal S. The adder 10d-2 obtains an addition output with the signal S 'delayed by 10d-1 and the other obtains a subtraction output with the signal S' delayed by the adder 10d-3, and performs sound image localization processing. ,
By adding to the front two-channel stereo signal described later, the S + S 'virtual sound image is localized at the symmetrical position behind the listener with respect to the back sound from the two front speakers.

Next, the sound image localization processing circuit 1
The sound image localization signals Ls, Rs processed by 0d are supplied to addition circuits 10e, 10f, added to the front-channel stereo signals L, R supplied from the other, and generated as surround signals Lx, Rx signals, respectively. Is done.

The surround signals Lx, Rx
The signals are respectively supplied to the audio signal distribution devices 2 and 3 at the next stage, and the slave devices 5-1,.
−n are supplied with both channel signals. In these slave machines 5-1,..., 5-n, surround signals of both channels are recorded on a mounted medium together with a video signal coming from a video signal processing system (not shown). Created as

Therefore, by using the recording medium created in this manner, the recording medium conventionally used in ordinary households can be used.
If reproduced by the speaker system, for example, as shown in FIG. 11, the virtual speakers SP3 and SP behind the listener M
4 or a realistic sound is reproduced such that the sound is radiated from the virtual speaker SP5 in front.

FIG. 3 shows a duplication system shown as a second embodiment. In this case, a video signal, a front two-channel stereo signal, a front one-channel center channel signal, and a rear two-channel signal are used. This is an example in which a recording medium such as a video tape or a disc on which a stereo surround signal or an audio signal obtained by digitally compressing and encoding a low frequency signal for a spuffer is recorded as a master medium. Note that, as described above,
The video signal processing system is not disclosed for simplification of the description.

A digital signal stream is reproduced and supplied from the recording medium mounted by the master reproducer 15 to the surround decoder 10a ', and the front two-channel stereo signals Lf and Rf, the front one-channel center channel signal C, When the stereo surround signals Lr and Rr of the rear two channels and the low frequency signal for the superwoofer are recorded, these signals are demodulated and separated. In addition, the low-frequency signal for superwoofer is
Normally, reproduction is performed by a super-woofer or distribution to each channel is performed, but the description is omitted in this embodiment.

The center channel signal C is supplied to the attenuator 10
g, the signal is attenuated by about 3 db and supplied to the adders 10b and 10c, respectively.
And the right stereo signal Rf and the signal L
f 'and Rf'. The stereo signals Lr and Rr of the rear two channels are supplied to the sound image localization processing circuit 10d '. The configuration of the sound image localization processing circuit 10d 'is shown in FIG.
The configuration shown in FIG. 7 is the same as that of the sound image localization processing unit in FIG. 2 described above, and performs the same processing as described above.

The sound image localization signals Ls, Rs generated by the sound image localization processing circuit 10d 'are added to the adder circuit 10d.
The stereo signals Lf 'and Rf' are added at e and 10f, respectively, and each of the slave machines 5-f is added in the same manner as in the previous embodiment.
1,..., 5-n are recorded on the recording medium.

FIG. 5 is a schematic block diagram showing a third embodiment, which is a modification of FIG. In the above-described embodiment, the signal recorded on the recording medium is encoded and recorded. However, in the present embodiment, each signal is not encoded and is recorded as an independent channel. Therefore, the surround decoder circuit 10 shown in FIG.
a 'becomes unnecessary. Such a configuration is naturally applicable to the embodiment shown in FIG.

Next, according to the configuration of each of the above-described embodiments, the dynamic range of the audio signal is widened by adding the front stereo signal and the sound image localization signal. May be limited by the dynamic range. For example, as shown in FIG. 6, when the recordable level width is a,
When a signal such as a waveform arrives from the adder, the signal exceeds the recordable level width a, and the excess portion is clipped to form a waveform. Therefore, the waveform is distorted at the clipped portion. Therefore, it is necessary to prevent the occurrence of noise by keeping the signal level at a recordable level like a waveform.

FIG. 7 shows a fourth embodiment in which the signal after addition is subjected to a compressor process or a limiter process to limit the dynamic range. In the figure, the surround processing device 30 is configured by adding compressor processing circuits 30a and 30b to the subsequent stage of the adders 10e and 10f of the surround processing device 10 according to the first embodiment of FIG. The processing characteristics of the compressor processing circuits 30a and 30b are, for example, the characteristics shown in FIG. 8A. According to this example, a portion having a large input level (about +10 dB or more)
This is a process suitable for securing a level when there is no surround signal. Further, a characteristic process as shown in FIG. In this case, the compressor processing is performed uniformly at all input levels.

The compressor processing circuit 30
Instead of a and 30b, a limiter circuit having a limiter processing characteristic as shown in FIG. 8C may be provided. In this case, the output level is constant (+20 dB)
The characteristic is such that it is restricted so as not to become the above. How to perform such a compressor or limiter process or setting of characteristics is determined by a recording medium, a recording method, the contents of a program, and the like.

FIG. 9 shows a fifth embodiment, in which only the surround processing device 40 is described in the same manner as described above. In the case of this embodiment, the compressor processing circuits 40c-1, 40c-2, 40c-3, 4 are provided before the adders 10e, 10f.
0c-4, respectively, and a control circuit 40 for controlling the characteristics of each compressor processing circuit at the preceding stage.
a and 40b are provided to constitute a surround processing device 40. With such a configuration, compressor processing can be performed according to each signal level, and more applicable control can be performed. In this embodiment, of course, the compressor processing circuits 40c-1, 40c-2, 40c-
A limiter circuit may be provided instead of 3, 40c-4, and the operation of the limiter may be controlled according to the signal level. In addition, the fourth and fifth embodiments can naturally be applied to a surround processing device having no surround decoder circuit as shown in the third embodiment.

Next, FIG. 10 shows an editing system for creating a master tape according to the sixth embodiment, which includes the master reproducing machine 1 (15, 20) and the first to fifth embodiments. Any of the surround processing devices 10 (1
6, 21, 30, 40) and a master recorder 50. This system creates a master tape on which a surround signal is recorded.If a master tape subjected to the sound image localization processing as described above is created in advance, the system shown in the above-described conventional system is directly used. By utilizing this, a recording medium on which surround signal processing has been performed can be created.

As described above, according to each of the above-described embodiments, a system using only two front speakers, which is used in a general household, is provided by a virtual speaker that is present at the rear or front center, and provides a realistic surround sound. A recording medium capable of reproducing sound can be provided.

The above embodiment has been described on the premise that a recording medium in which a video signal and an audio signal are mixed is prepared.
Of course, it is needless to say that the present invention can be applied to a medium in which only an audio signal is recorded.

In each of the above embodiments, the center channel signal C is added by the adders 10b and 10c. However, the center channel signal C is added to the rear channel signal in the sound image localization processing circuit and then the rear adders 10e and 10e are added. 10f may be added, and in that case, the adders 10b and 10c become unnecessary.

In each embodiment, the recording medium including the center channel signal C is handled. However, there are cases where the center channel signal C is not included. Is unnecessary.

Further, the form of the signal on the recording medium to be finally created may be recorded as an analog signal or digital signal, and the A / D may be appropriately determined according to the form. A converter or a D / A converter is provided in the slave device or in a stage preceding the distribution device.

[0057]

As described above, according to the present invention,
A system using only two front speakers, which is used in a general household, has an effect of providing a recording medium capable of reproducing a realistic surround sound from a virtual speaker that is present at the rear or front center.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a duplication system according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a sound image localization processing circuit according to the first embodiment.

FIG. 3 is a schematic block diagram of a duplication system according to a second embodiment of the present invention.

FIG. 4 is a block diagram of a sound image localization processing circuit according to a second embodiment.

FIG. 5 is a schematic block diagram of a duplication system according to a third embodiment of the present invention.

FIG. 6 is a waveform chart for explaining input characteristics to a slave device.

FIG. 7 is a schematic block diagram of a duplication system according to a fourth embodiment of the present invention.

FIG. 8 is a diagram showing a processing waveform of the compressor processing circuit.

FIG. 9 is a schematic block diagram of a duplication system according to a fifth embodiment of the present invention.

FIG. 10 is a schematic block diagram of an editing system according to a sixth embodiment of the present invention.

FIG. 11 is a diagram for explaining a surround effect when a recording medium created from the system according to the embodiment of the present invention is reproduced.

FIG. 12 is a schematic block diagram of a conventional duplication system.

FIG. 13 is a diagram of a conventional surround sound listening system.

FIG. 14 is a diagram of a listening system performed in a general household.

[Explanation of symbols]

1, 15, 20 Master playback device 2, 3 Audio signal distribution device 5-1 to 5-n Slave device 10, 16, 21, 30, 40 Surround processing device 10a, 10a 'Surround decoder circuit 10d, 10d' Sound image localization processing Circuits 10b, 10c, 10e, 10f Adders 30a, 30b, 40c-1, 40c-2, 40c-
3,40c-4 Compressor processing circuit 50 Master recorder

Claims (24)

[Claims] 1. A reproducing means for mounting and reproducing a recording medium in which at least a front two-channel stereo signal and a rear channel signal for obtaining a surround sound effect are encoded, and the reproducing means. Decoding means for decoding the reproduced signal and extracting it as an independent channel signal, and sound image localization processing means for performing a convolution operation on the time axis for the rear channel signal extracted by the decoding means. Adding means for adding the signal subjected to the sound image localization processing and the front two-channel stereo signal extracted from the decoding means; distributing means for distributing the signal output from the adding means; Means for recording signals supplied from the recording means on the attached recording medium. Duplication system characterized by consisting of means. 2. The duplication system according to claim 1, wherein the signal encoded on the recording medium is:
At least, a front two-channel stereo signal and a rear one-channel monaural signal for obtaining a surround sound effect are converted into two channels and encoded. At the time of decoding, the two-channel signals are converted into independent channel signals. Duplication system characterized by taking out as a. 3. The duplication system according to claim 1, wherein the signal encoded on the recording medium is:
At least the front two-channel stereo signal and the rear two-channel stereo signal for obtaining the surround sound effect are digitally compressed and encoded, and at the time of decoding, the respective signals are taken out as independent channel signals. Characteristic duplication system. 4. A reproducing means for mounting and reproducing a recording medium in which at least a front two-channel stereo signal and a rear channel signal for obtaining a surround sound effect are recorded as independent channel signals, and Sound image localization processing means for causing the rear channel signal reproduced by the reproduction means to perform a convolution operation on the time axis, and the sound image localization processed signal and the front two channel stereo reproduced by the reproduction means An adding unit for adding the signal, a distributing unit for distributing the signal output from the adding unit, and a plurality of recording units for recording the signal supplied from the distributing unit on the mounted recording medium. A duplication system comprising: 5. The duplication system according to claim 4, wherein the independent channel signal recorded on the recording medium is at least a front two-channel stereo signal and a rear one-channel monaural signal for obtaining a surround sound effect. A duplication system characterized by being a signal. 6. The duplication system according to claim 4, wherein the independent channel signal recorded on the recording medium is at least a front two-channel stereo signal and a rear two-channel stereo signal for obtaining a surround sound effect. A duplication system characterized by being a signal. 7. A duplication system according to claim 1, wherein a predetermined high-frequency level or a whole-level level of a signal output from said adding means is provided at a subsequent stage of said adding means. A duplication system comprising a compressor means for performing processing. 8. A duplication system according to claim 1, wherein a limiter for limiting a predetermined high-frequency level of a signal output from said adding means is provided at a subsequent stage of said adding means. A duplication system comprising means. 9. The duplication system according to claim 1, wherein a stereo signal of the front two channels and a convolution operation process on the time axis are performed before the adding means. Compressor means for performing a predetermined high-frequency level or whole-area level compression process on the rear channel signal thus selected, and detecting the levels of the front two-channel stereo signal and the rear channel signal to control the compressor means A duplication system comprising: 10. The duplication system according to claim 1, wherein a stereo signal of the front two channels and a convolution operation process on the time axis are performed before the adding means. Limiter means for limiting a predetermined high-frequency level with the rear channel signal thus obtained;
A duplication system comprising: control means for detecting a level of a channel stereo signal and a rear channel signal and controlling the limit means. 11. A reproducing means for mounting and reproducing a recording medium in which at least a front two-channel stereo signal and a rear channel signal for obtaining a surround sound effect are recorded, and the reproducing means. Decoding means for decoding and reproducing each of the reproduced signals; sound image localization processing means for causing the rear channel signal extracted by the decoding means to perform a convolution operation on a time axis; and sound image localization processing. Addition means for adding the processed signal and the front two-channel stereo signal extracted from the decoding means, and recording means for recording the signal output from the addition means on a mounted recording medium. Editing system consisting of: 12. The editing system according to claim 11, wherein the signals encoded on the recording medium include at least two stereo signals on the front two channels and a monaural signal on the one rear channel for obtaining a surround sound effect. An editing system which is channelized and encoded, and extracts the two-channel signal as an independent channel signal at the time of decoding. 13. The editing system according to claim 11, wherein the signals encoded on the recording medium include at least two channels of front stereo signals and two rear channels of stereo signals for obtaining a surround sound effect. An editing system, which has been compressed and encoded, and takes out each of the signals as an independent channel signal at the time of decoding. 14. A reproduction means for mounting and reproducing a recording medium on which at least two front stereo signals and a rear channel signal for obtaining a surround sound effect are recorded as independent channel signals, and
Sound image localization processing means for performing a convolution operation on the time axis to the rear channel signal reproduced and supplied from the reproduction means; and a signal subjected to the sound image localization processing and reproduced and supplied from the reproduction means. An editing system comprising: adding means for adding the front two-channel stereo signal to the recording medium; and recording means for recording a signal output from the adding means on a mounted recording medium. 15. The editing system according to claim 14, wherein the independent channel signal recorded on the recording medium is at least a front two-channel stereo signal,
An editing system, characterized in that it is a rear one-channel signal for obtaining a surround sound effect. 16. The editing system according to claim 14, wherein the independent channel signal recorded on the recording medium is at least a front two channel stereo signal,
An editing system comprising: a rear two-channel signal for obtaining a surround sound effect. 17. A step of reproducing the recorded signal from a recording medium on which at least a front two-channel stereo signal and a rear channel signal for obtaining a surround sound effect are encoded and recorded; Decoding the extracted signals as independent channel signals and extracting the signals, performing convolution operation on the time axis for the extracted rear channel signals to perform sound image localization processing, and performing the sound image localization processing. Signal and the decoded front 2
Adding the stereo signals of the channels, distributing the added signals to a plurality of recording means, and recording the distributed signals on a recording medium mounted on the plurality of recording means. How to create a recording medium. 18. Reproducing the recorded signal from a recording medium on which at least a front two-channel stereo signal and a rear channel signal for obtaining a surround sound effect are recorded as independent channel signals, Causing the reproduced rear channel signal to perform a convolution operation on the time axis to perform a sound image localization process; and adding the sound image localization processed signal and the reproduced front two channel stereo signals. And a step of distributing the added signals to a plurality of recording means, and recording the distributed signals on a recording medium mounted on the plurality of recording means. 19. A step of reproducing the recorded signal from a recording medium on which at least a front two-channel stereo signal and a rear channel signal for obtaining a surround sound effect are encoded and recorded; and Decoding the extracted signals as independent channel signals and extracting the signals, performing convolution operation on the time axis of the extracted rear channel signals to perform sound image localization processing, and performing the sound image localization processing. Signal and the decoded front 2
A method for producing a recording medium, comprising: a step of adding a stereo signal of a channel; and a step of recording the added signal on a recording medium mounted on recording means. 20. reproducing the recorded signal from a recording medium in which at least a front two-channel stereo signal and a rear channel signal for obtaining a surround sound effect are recorded as independent channel signals; Performing a convolution operation on the time axis for the reproduced rear channel signal to perform a sound image localization process; and adding the reproduced sound image localization signal and the reproduced front two-channel stereo signal. And a step of recording these added signals on a recording medium mounted on the recording means. 21. A method for producing a recording medium according to claim 17, wherein after the adding step, a processing step of compressing the added signal at a predetermined high level or an entire level is performed. A method for producing a recording medium, wherein the recording medium is provided. 22. A method for producing a recording medium according to claim 17, wherein a step of limiting a predetermined high-frequency level of the added signal is provided after the step of adding. A method for producing a recording medium, comprising: 23. The method for producing a recording medium according to claim 17, 18, 19, or 20, wherein a convolution operation on the time axis and the stereo signal of the front two channels is performed before the adding step. Compression processing of the rear channel signal with the predetermined high frequency level or the whole frequency level, and performing the compression processing by detecting the levels of the front two-channel stereo signal and the rear channel signal and performing the compression. A method for producing a recording medium, comprising a processing step for determining a degree. 24. The method for producing a recording medium according to claim 17, 18, 19, or 20, wherein before the adding step, a stereo signal of two front channels and a convolution operation on the time axis are performed. Processing step of limiting a predetermined high-frequency level of the rear channel signal and detecting the level of the front two-channel stereo signal and the rear channel signal to determine the degree of restriction when performing the restriction. A method for producing a recording medium, characterized in that a recording medium is provided.