JPH10336580A - Reproduction device and recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a digital recording and reproducing device to simply conduct dubbing an audio signal and a video signal subject to high efficiency coding, without causing distortions. SOLUTION: A video signal whose error in a reproduction state is corrected by an error correction coder 13a, an error correction decoder 19a and a video correction device 20a and subject to high efficiency coding by a high efficiency coding device 12a. An audio signal whose error in a reproduction state is corrected by an audio correction device 22a are given to a multiplexer 26, in which the signals are multiplexed on time base, and the resulting signal is used for a digital dubbing output in the reproduction side device. The recording side device adds an error correction code to the received signal and records the resulting signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dubbing digital signals between digital recording / reproducing devices using a high efficiency coding technique.

[0002]

2. Description of the Related Art In conventional digital audio equipment or digital video equipment, dubbing is performed using an audio signal or an image signal which has been A / D converted. Hereinafter, a digital recording VTR will be described as an example.

FIG. 5 is a block diagram showing a conventional dubbing method for a digital recording VTR, wherein 1 is an A / D converter, 2 is an error correction encoder, 3 is a modulator, and 4 is a magnetic recording / reproducing system. Reference numeral 5 denotes a demodulator, 6 denotes an error correction decoder, 7 denotes a modifier, and 8 denotes a D / A converter.

The digital recording V constructed as described above
In the method of dubbing the digital signal of the TR, the digital signal of the dubbing input is switched to the output of the A / D converter 1 and input to the error correction encoder 2, where the digital signal is subjected to error correction encoding. The signal is modulated by the modulator 3 and recorded on a magnetic tape. At the time of reproduction, the data reproduced from the tape is demodulated by the demodulator 5, corrected by the error correction decoder 6, and corrected by the corrector 7 to an uncorrectable error. A digital signal of a dubbing output is taken out immediately before the D / A converter 8.

On the other hand, the biggest problem when recording and reproducing digital signals is that the data amount is very large. Therefore, various high-efficiency coding methods have been proposed, and recording and reproducing devices using high-efficiency codes are being developed. High-efficiency coding is generally performed on frequency components obtained by orthogonally transforming a target signal. In the orthogonal transformation and the inverse orthogonal transformation, a digit cancellation error occurs in terms of the number of digits used in the calculation and the number of output digits. For example, 8x
In the eight-dimensional Hadamard transform, when the input is 8 bits, the output is 14 bits, but the higher 9 to 10 bits are actually used for high efficiency coding. In the 8 × 8-dimensional discrete cosine transform, the input is 8 bits and the coefficient is 1
When it is 4 bits, only the upper 12 bits are used for high-efficiency encoding, and the true value of the coefficient is an irrational number.

[0006]

In the above-described editing method, the number of orthogonal transforms and inverse orthogonal transforms performed on the original signal per dubbing increases by one, and the orthogonal transform and the inverse orthogonal transform are performed. There is a problem that the distortion due to the conversion is accumulated and the distortion due to the high-efficiency coding is also generated accordingly.

In the case of digital dubbing, in particular, the transmission rate of the output video signal is as high as 216 Mbps in the case of the 4: 2: 2 standard, and serial transmission is difficult. Parallel transmission is difficult for cables used for dubbing. Shape problems arise. In addition, the transmission of audio signals is not included in the video signal standard, so that problems such as cables and transmission rates are further increased. In view of such a point, the present invention
An object of the present invention is to provide a dubbing method that does not cause distortion in a recorded digital signal.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an apparatus for recording and reproducing a digital audio signal and a digital video signal which has been encoded with high efficiency. During the data blank period of the video signal, a signal obtained by compressing and multiplexing the audio signal on the time axis is used as a digital dubbing output. On the recording side, the digital dubbing output is used as a digital dubbing input to separate and record the video signal and the audio signal. is there.

Further, the present invention provides a device for recording and reproducing a digital audio signal and a digital video signal which has been encoded with high efficiency, in which dubbing is performed on the reproducing side using the video signal and audio signal before being decoded with high efficiency. When performing the recording, the recording side performs a monitor by causing a portion unnecessary for dubbing recording to perform a reproduction process.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) (FIG. 1) is a first embodiment of the present invention.
11a and 11b are video signal A / D converters, 12a and 12b are high efficiency encoders, 13a and 13b are error correction encoders, 14a and 14
b is an audio signal A / D converter, 15a and 15b are audio signal coding processors, 16a and 16b are modulators, 17a and 17
b is a magnetic recording / reproducing system, 18a and 18b are demodulators, 19
a and 19b are error correction decoders, 20a and 20b are video signal modifiers, 21a and 21b are audio signal decoding processors,
22a and 22b are audio signal modifiers, 23a and 23b are high-efficiency decoders, 24a and 24b are video signal D / A converters, 25a and 25b are audio signal D / A converters, 26a,
26b is a multiplexer, and 27a and 27b are separators.

In the digital signal recording / reproducing apparatus configured as described above, the input video signal is A / D-converted by the video signal A / D converter 11a, and is converted by the high-efficiency encoder 12a to high efficiency. After the encoding, the error correction encoder 13a performs error correction encoding. The input audio signal is A / D-converted by an audio signal A / D converter 14a, subjected to audio signal processing such as shuffling and error correction encoding by an audio signal encoding processor 15a, and then subjected to error correction. It joins with the video signal of the encoder 13a. If the error correction code of the audio signal is common to a part or all of the error correction code of the video signal, the error correction encoding of the audio signal of the common part can be performed by the error correction encoder 13a.
The signal is modulated by the modulator 16a, and the magnetic recording / reproducing system 17a
Will be recorded.

The data reproduced from the magnetic recording / reproducing system 17a is demodulated by a demodulator 18a, corrected by an error correction decoder 19a, and then corrected by a video signal corrector 20a. The signal obtained at this time is used as a video signal part of dubbing output. Audio signal decoding processor 21a
After the audio signal processing such as error correction encoding and deshuffling, the audio signal adjuster 22a corrects an uncorrectable error. The signal obtained at this time is used as the audio signal part of the dubbing output. If the error correction decoding method of the audio signal is common to part or all of the error correction decoding method of the video signal, the error correction decoding processing of the audio signal of the common part can be performed by the error correction decoder 19a.

When the video signal is finally output, the video signal is decoded by the high-efficiency decoder 23a and then the video signal D / A converter 2
The video signal and the audio signal that have been D / A converted at 4a are output as audio signals that have been D / A converted at the D / A converter 25a. The error correction encoder 19 outputs the video signal and the audio signal so that the order of the video signal and the audio signal on the time axis is the same as that at the time of recording input.
a, a video modifier 20a, an audio signal decoding processor 21a,
The time axis is adjusted by the memory in the high-efficiency decoder 23a. However, the state may not be the same as that at the time of recording input, for example, because the amount of memory required for time axis adjustment is large.

In dubbing, a signal obtained by time-multiplexing the outputs of the video signal modifier 20a and the audio signal modifier 22a in the multiplexer 26a is used as a digital dubbing output.
The output signal of the video signal modifier 20a has a period without data, and the output signal of the audio signal modifier 22a is time-axis compressed so that it can be multiplexed in this period. At this time, the order of the video signal and the audio signal on the time axis is adjusted. However, also in this case, the context on the time axis may not be maintained because of the large amount of memory required for time axis adjustment.

The digital dubbing output from the multiplexer 26a of the reproducing device is input as a digital dubbing input to the separator 27b of the recording device, and is separated into a video signal portion and an audio signal portion. Chemistry 1
2b or the output from the audio signal A / D converter 14b and input to the error correction encoder 13b or the audio signal encoding processor 15b for signal processing, and then modulated by the modulator 16b for magnetic recording. This is performed by recording on the reproduction system 17b. Even at this point, the order of the video signal and the audio signal on the time axis is adjusted so as to be the same as when the video signal and the audio signal are normally input and recorded. The output of the separator 27b can be switched so that an arbitrary video signal or audio signal is recorded in place of a normally input signal.

As described above, according to the present embodiment, no matter how many dubbings are performed, the number of times of high-efficiency encoding is only one at the time of first recording, and high-efficiency decoding is performed. Since the number of times is only one at the time of final output, distortion due to orthogonal transform and high-efficiency coding does not accumulate. In addition, since the dubbing signal is transmitted in the state of being encoded with high efficiency, the transmission rate can be reduced.

In the case of a VTR, for example, in addition to information such as character information, a title, and recording date and time, information relating to the input format of a video signal and an audio signal, and information relating to a signal recording state such as copy protection, editing or dubbing history. Are recorded as auxiliary data simultaneously with the video and audio signals. Here, it is also possible to multiplex the auxiliary data with the dubbing output signal and perform dubbing recording as it is.

If the contents to be recorded are protected,
Dubbing by changing from the state of protection to non-protection, dubbing by changing from the state of non-protection to the state of protection, and changing the code on devices that use a code such as a password when performing protection And other operations such as dubbing.

The block configuration described in the above embodiment is an example, and dubbing can be performed in a similar manner by using a different configuration. For example, in the present embodiment, dubbing is performed between two devices,
It may be a single device capable of recording while preceding playback. A / D and D / A conversion are all used as analog for the recording input and reproduction output of the video signal and the audio signal, respectively. Any of these inputs and outputs may be digital signals, and the A / D converter And the input of the D / A converter can be switched. Further, the present embodiment can be applied regardless of the number of channels of the video signal and the audio signal. The same applies to other similar devices.

(Embodiment 2) FIG. 2 shows a signal format of a digital dubbing output according to a second embodiment of the present invention. FIG. 2A shows a timing chart of the dubbing reference signal and the dubbing data. Since the color phase start is periodically shifted in each field, the color phase start indicates the start position of the cycle. (Figure 2
(B)) is a timing chart of an example of dubbing data. During a certain period of data (525 line-60 Hz system: 74,752 clock, 625 line-50 Hz system: 89600 clock), there is actually a part with data and a blank part, as shown in the figure,
512 clocks consisting of 384 clocks of data and 128 clocks of blank space are repeated. One byte of data is used for one clock. Therefore, the actual data amount per field is NTSC, and the video signal
51840 bytes, audio signal 3456 bytes, auxiliary data 768 bytes
s, PAL, video signal 62208 bytes, audio signal 422
4 bytes and 768 bytes of auxiliary data are the maximum. (Figure 2
(C) shows the byte configuration of the dubbing data. 4.5
Since the transmission is (Mega bytes per second), as shown in the figure, this is an example of transmitting at 18 Mbps by using two signal lines for dubbing data. Also, if there are eight signal lines for dubbing data, each bit may be transmitted at 4.5 Mbps on each signal line, but if there are four, two bits from each byte are transmitted at 9 Mbps on each signal line. If it is one, it must be transmitted at 36 Mbps bit-serial. In addition, 1 of blank part
If 28 clocks are eliminated, if there is only one signal line for dubbing data, bit-serial transmission at 27 Mbps is possible.

The output format of the dubbing signal described in the above embodiment is merely an example. In this embodiment, the data to be dubbed is divided into a video signal, an audio signal, and auxiliary data for each field. Although they are output in order,
Any division or order may be used. Also, it is not necessary to use one field as a unit, and the amounts and transmission rates of the video signal, the audio signal, the auxiliary data, and the like are also arbitrary.

(Embodiment 3) FIG. 3 shows a signal format of a digital dubbing output according to a third embodiment of the present invention. This is an example in which a reference signal is multiplexed with data. If a synchronization pattern (Sync) is multiplexed for each field, a synchronization pattern that appears regularly can be used as a reference signal. If a field number (or a frame number) is assigned to the ID code (ID), the color phase can be determined, and the continuity of the numbers can be used when detecting a synchronization pattern. Also,
A signal (normal reproduction, high-speed / slow reproduction, its speed, etc.) indicating the reproduction state on the reproduction device side can also be assigned to the ID code. A signal indicating whether or not each signal can be used can be assigned to an ID code, and when copy guard or encryption is taken into account, it is possible to indicate a state in which output of some signals is prohibited.

The output format of the dubbing signal described in the above embodiment is an example. In the present embodiment, the data to be dubbed is divided into a video signal, an audio signal, and auxiliary data for each field, and the data is output in this order. , But any division or order may be used. It is not necessary to use one field as a unit, and the amounts of the video signal, the audio signal, the auxiliary data, and the like, the configuration of the synchronization pattern and the ID code, and the transmission rate are also arbitrary.

In the second and third embodiments,
A specific pattern that facilitates clock reproduction on the recording device side may be assigned to a part that does not actually have data (for example, a blank part in the third embodiment). Further, in each of the embodiments, output is performed in baseband, but modulation may be performed.

When only a part of the signal is required (for example, insertion of an audio signal), other than that signal may be dummy data. Therefore, in the second and third embodiments,
It is not necessary that all data of the video signal, the audio signal, and the auxiliary data be multiplexed.

(Embodiment 4) By the way, there are many parts which can be shared as the signal processing between the high efficiency coding and the high efficiency decoding. The same applies to audio signal processing and error correction,
As in the fourth embodiment shown in FIG. 4, there is a recording / reproducing device that performs only one of recording and reproducing. 31a, 3
1b is a high-efficiency code signal processor, 32a and 32b are error correction code signal processors, 33a and 33b are audio signal processors,
34a and 34b are modems, and 35a and 35b are demultiplexers. Even when such a device is used as a recording device at the time of dubbing, the high-efficiency code signal processor 31b performs reproduction signal processing, and performs an error correction code signal processor 32b, an audio signal processor 33b, and a modem. By causing the recording signal processing to be performed by the recording device 34b, it is possible to monitor the signal being dubbed using the reproduction output of the recording device. The high-efficiency code signal processors 31a and 31b perform high-efficiency encoding during recording and high-efficiency decoding during reproduction. The error correction code signal processors 32a and 32b perform error correction encoding during recording, and perform error correction decoding and modification during reproduction. The audio signal processors 33a and 33b perform audio signal encoding processing during recording, and perform audio signal decoding processing and modification during reproduction. The modulators and demodulators 34a and 34b perform modulation during recording and demodulation during reproduction. Demultiplexers 35a, 3
5b separates a video signal and an audio signal for a dubbing signal input and multiplexes a video signal and an audio signal for a dubbing signal output while switching between normal recording input, reproduction output, and dubbing signal input / output. .

In the fourth embodiment, the first
In the case of the block configuration as shown in the embodiment,
If the output of the modulator 16b and the input of the demodulator 18b are directly connected to the recording device, not only the reproduction output of the reproduction device but also the dubbing signal can be monitored using the reproduction output of the recording device. it can. On the other hand, the same applies when the output of the separator 27b of the recording-side device is directly connected to the input of the multiplexer 26b.

[0029]

As described above, according to the present invention, dubbing can be repeatedly performed at a low transmission rate without causing distortion of orthogonal transform or high-efficiency coding, and its practical effect is as follows. large.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a digital signal dubbing method according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of an output signal format of a digital signal dubbing method according to a second embodiment of the present invention;

FIG. 3 is an explanatory diagram of an output signal format of a digital signal dubbing method according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a digital signal dubbing method according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a conventional digital signal dubbing method.

[Explanation of symbols]

 11a, 11b Video signal A / D converter 12a, 12b High efficiency encoder 13a, 13b Error correction encoder 14a, 14b Audio signal A / D converter 15a, 15b Audio signal encoding processor 16a, 16b Modulator 17a, 17b Magnetic recording / reproducing system 18a, 18b Demodulator 19a, 19b Error correction decoder 20a, 20b Video signal modifier 21a, 21b Audio signal decoder 22a, 22b Audio signal modifier 23a, 23b High-efficiency decoding Devices 24a, 24b video signal D / A converters 25a, 25b audio signal D / A converters 26a, 26b multiplexers 27a, 27b separators

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[Procedure amendment]

[Submission date] July 8, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Playback device and recording device

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus capable of digital dubbing utilizing a high-efficiency coding technique.
And playback devices .

[0002]

2. Description of the Related Art In conventional digital audio equipment or digital video equipment, dubbing is performed using an audio signal or an image signal which has been A / D converted. Hereinafter, a digital recording VTR will be described as an example.

FIG. 5 is a block diagram showing a conventional digital recording VTR , wherein 1 is an A / D converter, 2 is an error correction encoder, 3 is a modulator, and 4 is magnetic recording / reproducing. System, 5 is a demodulator, 6 is an error correction decoder, 7 is a modifier, 8 is D / A
It is a converter.

The digital recording V constructed as described above
If the dubbing of the digital signal by TR, the recording
In the device on the side, the digital signal of the dubbing input is switched to the output of the A / D converter 1 to switch the error correction encoder 2.
And error-correction-coded. And modulator 3
And recorded on a magnetic tape. Playback device
Here , the data reproduced from the tape is demodulated by a demodulator 5 and corrected by an error correction decoder 6, and an uncorrectable error is corrected by a corrector 7. Also, the D / A converter 8
The digital signal is output just before
Output .

On the other hand, the biggest problem when recording and reproducing digital signals is that the data amount is very large. Therefore, various high-efficiency coding methods have been proposed, and recording and reproducing devices using high-efficiency codes are being developed. High-efficiency coding is generally performed on frequency components obtained by orthogonally transforming a target signal. In the orthogonal transformation and the inverse orthogonal transformation, a digit cancellation error occurs in terms of the number of digits used in the calculation and the number of output digits. For example, 8x
In the eight-dimensional Hadamard transform, when the input is 8 bits, the output is 14 bits, but the higher 9 to 10 bits are actually used for high efficiency coding. In the 8 × 8-dimensional discrete cosine transform, the input is 8 bits and the coefficient is 1
When it is 4 bits, only the upper 12 bits are used for high-efficiency encoding, and the true value of the coefficient is an irrational number.

[0006]

SUMMARY OF THE INVENTION The conventional data as described above is used.
In a digital recording VTR , the number of orthogonal transforms and inverse orthogonal transforms performed on an original signal per dubbing increases by one, and distortions due to orthogonal transforms and inverse orthogonal transforms accumulate. However, there is a problem that distortion due to the formation also occurs.

In the case of digital dubbing, in particular, the transmission rate of the output video signal is as high as 216 Mbps in the case of the 4: 2: 2 standard, and serial transmission is difficult. Parallel transmission is difficult for cables used for dubbing. Shape problems arise. In addition, the transmission of audio signals is not included in the video signal standard, so that problems such as cables and transmission rates are further increased. In view of such a point, the present invention
It is an object of the present invention to provide a reproducing apparatus and a recording apparatus which enable dubbing so that distortion is not generated in a digital signal to be recorded.

[0008]

According to the present invention , there is provided an apparatus for reproducing a digital audio signal and a digital video signal encoded with high efficiency.
The digital video signal before being decoded is not transmitted.
Time-compressed digital audio signal
It is intended to have a multiplexing means for heavy and outputs.

The present invention also provides an apparatus for recording a digital audio signal and a digital video signal encoded with high efficiency.
At least multiplexed digital video
The multiplexed digital video with an audio signal as input
・ For the audio signal, the digital video signal and the data
After being separated into digital audio signals, they are recorded on a medium .

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) (FIG. 1) is a first embodiment of the present invention.
11A and 11B are block diagrams of a digital signal recording / reproducing apparatus according to the embodiment of the present invention, wherein 11a and 11b are video signal A / D converters, 12a and 12b are high-efficiency encoders, 13a and 13b
Is an error correction encoder, and 14a and 14b are audio signal A / D
Transformers, 15a and 15b are audio signal encoding processors, 16
a and 16b are modulators, 17a and 17b are magnetic recording / reproducing systems, 18a and 18b are demodulators, 19a and 19b are error correction decoders, 20a and 20b are video signal modifiers, 21
a and 21b are audio signal decoding processors, 22a and 22b are audio signal modifiers, 23a and 23b are high-efficiency decoders,
4a, 24b are video signal D / A converters, 25a, 25b
Is an audio signal D / A converter, 26a and 26b are multiplexers,
27a and 27b are separators.

In the digital signal recording / reproducing apparatus configured as described above, the input video signal is A / D-converted by the video signal A / D converter 11a, and is converted by the high-efficiency encoder 12a to high efficiency. After the encoding, the error correction encoder 13a performs error correction encoding. The input audio signal is A / D-converted by an audio signal A / D converter 14a, subjected to audio signal processing such as shuffling and error correction encoding by an audio signal encoding processor 15a, and then subjected to error correction. It is multiplexed with the video signal of the encoder 13a. If the error correction code of the audio signal is common to a part or all of the error correction code of the video signal, the error correction encoding of the audio signal of the common part can be performed by the error correction encoder 13a. The signal is modulated by the modulator 16a, and the magnetic recording / reproducing system 1
7a. As described above, the block that performs the recording operation
The locks 11a to 16a allow the video and audio signals to be
This is for recording.

The data reproduced from the magnetic recording / reproducing system 17a is demodulated by a demodulator 18a, corrected by an error correction decoder 19a, and then corrected by a video signal corrector 20a for uncorrectable errors. The signal obtained at this time is used as a video signal part of dubbing output. Audio signal decoding processor 21a
After the audio signal processing such as error correction encoding and deshuffling, the audio signal adjuster 22a corrects an uncorrectable error. The signal obtained at this time is used as the audio signal part of the dubbing output. If the error correction decoding method of the audio signal is common to part or all of the error correction decoding method of the video signal, the error correction decoding processing of the audio signal of the common part can be performed by the error correction decoder 19a.

When the video signal is finally output, the video signal is decoded by the high-efficiency decoder 23a and then the video signal D / A converter 2
The video signal and the audio signal that have been D / A converted at 4a are output as audio signals that have been D / A converted at the D / A converter 25a. So that the context of the time axis of the video signal and the audio signal in the same state as at the time of recording input when outputting the error correction decrypt 19
a, a video modifier 20a, an audio signal decoding processor 21a,
The time axis is adjusted by the memory in the high-efficiency decoder 23a. However, the state may not be the same as that at the time of recording input, for example, because the amount of memory required for time axis adjustment is large. That is, blocks 18a to 25 for performing a reproducing operation
a, which reproduces video and audio signals.
is there.

In the reproducing apparatus , the outputs of the video signal modifier 20a and the audio signal modifier 22a are multiplexed.
At 26a, a time-division multiplexed signal is output so that it can be used as a digital dubbing signal . The output signal of the video signal modifier 20a has a period without data, and the output signal of the audio signal modifier 22a is time-axis compressed so that it can be multiplexed in this period. At this point,
The order of the video signal and the audio signal on the time axis is adjusted. However, also in this case, the context on the time axis may not be maintained because of the large amount of memory required for time axis adjustment.

When performing dubbing recording, the separator 2
Digital dubbing signal input to 7b is separated into a video signal portion and an audio signal portion, each switching the output from the high-efficiency encoder 12b or audio signal A / D converter 14b error correction encoder 13b or After being input to the audio signal encoding processor 15b and subjected to signal processing, it is modulated by the modulator 16b and recorded in the magnetic recording / reproducing system 17b. Even at this point, the order of the video signal and the audio signal on the time axis is adjusted so as to be the same as when the video signal and the audio signal are normally input and recorded. The output of the separator 27b can be switched so that an arbitrary video signal or audio signal is recorded in place of a normally input signal.

As described above, according to the present embodiment, no matter how many dubbings are performed, the number of times of high-efficiency encoding is only one at the time of first recording, and high-efficiency decoding is performed. Since the number of times is only one at the time of final output, distortion due to orthogonal transform and high-efficiency coding does not accumulate. In addition, since the dubbing signal is transmitted in the state of being encoded with high efficiency, the transmission rate can be reduced.

In the case of a VTR, for example, in addition to information such as character information, a title, and recording date and time, information relating to the input format of a video signal and an audio signal, and information relating to a signal recording state such as copy protection, editing or dubbing history. Are recorded as auxiliary data simultaneously with the video signal and the audio signal. Here, the auxiliary data is also digital dubbing signal.
And dubbing can be performed as it is.

If the contents to be recorded are protected,
Dubbing by changing from the state of protection to non-protection, dubbing by changing from the state of non-protection to the state of protection, and changing the code on devices that use a code such as a password when performing protection And other operations such as dubbing.

It should be noted that the block configuration described in the above embodiment is merely an example, and the present invention is applicable to a different configuration.
Is available. For example, in the present embodiment, reproduction is performed.
Although dubbing is performed using a device that performs recording and a device that performs recording, a single device that can perform recording while reproducing in advance may be used. A / D and D / A conversion are all used as analog for the recording input and reproduction output of the video signal and the audio signal, respectively. Any of these inputs and outputs may be digital signals, and the A / D converter And the input of the D / A converter can be switched. Further, the present embodiment can be applied regardless of the number of channels of the video signal and the audio signal. It is also the same in other similar devices.

[0021] (Embodiment 2) (Figure 2) shows a signal format of the digital dubbing signal according to a second embodiment of the present invention. FIG. 2A shows a timing chart of the dubbing reference signal and the dubbing data.
Since the color phase start is periodically shifted in each field, the color phase start indicates the start position of the cycle. (Figure 2
(B)) is a timing chart of an example of dubbing data. In the data period (525 line-60 Hz system: 74,752 clock, 625 line-50 Hz system: 89,600 clock), the actual data portion and the blank portion are shown. As shown in the figure, data 384 clock, blank portion 512 clocks consisting of 128 clocks are repeated. One byte of data is used for one clock. Therefore, the actual data amount per field is NTSC in the case of NTSC, a video signal 51840 bytes, an audio signal 3456 bytes, and auxiliary data 768by.
tes, PAL, video signal 62208bytes, audio signal
4224 bytes and auxiliary data 768 bytes are the maximum. (Figure 2
(C) shows the byte configuration of the dubbing data. 4.5
(Mega bytes per second) transmission, so as shown in the figure, 18Mbps using two signal lines for dubbing data
This is an example of transmission. If there are eight signal lines for dubbing data, each bit may be transmitted at 4.5 Mbps on each signal line.
Each bit must be transmitted at 9 Mbps, and if it is a single bit, it must be transmitted at 36 Mbps bit-serial. In addition, if the 128 clocks in the blank part are eliminated, if there is one signal line for dubbing data, bit-serial transmission at 27 Mbps is possible.

Note that the digital data described in the above embodiment is
Signal format Le dubbing signal is an example, in this embodiment, the video signal data to be dubbed output every field, the audio signal, but is divided into auxiliary data outputted in this order, what division Or order. Also, it is not necessary to use one field as a unit, and the amounts and transmission rates of the video signal, the audio signal, the auxiliary data, and the like are also arbitrary.

[0023] (Embodiment 3) (FIG. 3), shows the signal format of the digital dubbing signal according to the third embodiment of the present invention. This is an example in which a reference signal is multiplexed with data . If a synchronization pattern (Sync) is multiplexed for each field, a synchronization pattern that appears regularly can be used as a reference signal. If a field number (or a frame number) is assigned to the ID code (ID), the color phase can be determined, and the continuity of the numbers can be used when detecting a synchronization pattern. Also,
A signal (normal reproduction, high-speed / slow reproduction, its speed, etc.) indicating the reproduction state on the reproduction device side can also be assigned to the ID code. A signal indicating whether or not each signal can be used can be assigned to an ID code, and when copy guard or encryption is taken into account, it is possible to indicate a state in which output of some signals is prohibited.

Note that the digital data described in the above embodiment is
Signal format Le dubbing signal is an example, video signal data to be dubbed output in the present embodiment for each field, the audio signal, but is divided into auxiliary data outputted in this order, what divided Ya The order may be used. Also, it is not necessary to use one field as a unit, and a video signal, an audio signal,
The respective amounts of the auxiliary data, the configuration of the synchronization pattern and the ID code, and the transmission rate are also arbitrary.

In the second and third embodiments,
A specific pattern that facilitates clock reproduction on the recording device side may be assigned to a part that does not actually have data (for example, a blank part in the third embodiment). Further, in each of the embodiments, output is performed in baseband, but modulation may be performed.

When only a part of the signal is required (for example, insertion of an audio signal), other than that signal may be dummy data. Therefore, in the second and third embodiments,
It is not necessary that all data of the video signal, the audio signal, and the auxiliary data be multiplexed.

(Embodiment 4) By the way, there are many parts which can be shared as the signal processing between the high efficiency coding and the high efficiency decoding. The same applies to audio signal processing and error correction,
As in the fourth embodiment shown in FIG. 4, there is a recording / reproducing device that performs only one of recording and reproducing. 31a, 3
1b is a high-efficiency code signal processor, 32a and 32b are error correction code signal processors, 33a and 33b are audio signal processors,
34a and 34b are modems, and 35a and 35b are demultiplexers . The high-efficiency code signal processors 31a and 31b perform high-efficiency encoding during recording and high-efficiency decoding during reproduction. The error correction code signal processors 32a and 32b perform error correction encoding during recording, and perform error correction decoding and modification during reproduction. The audio signal processors 33a and 33b perform audio signal encoding processing during recording, and perform audio signal decoding processing and modification during reproduction. The modulators and demodulators 34a and 34b perform modulation during recording and demodulation during reproduction. Demultiplexers 35a, 3
5b separates a video signal and an audio signal for a dubbing signal input and multiplexes a video signal and an audio signal for a dubbing signal output while switching between normal recording input, reproduction output, and dubbing signal input / output. .

[0028] Also in the fourth embodiment described above, the first
How many times dubbing is done as in the embodiment
Also, the number of times of high efficiency coding is 1 when it is first recorded.
Only the number of times, and the number of times of efficient decoding is finally output
Is performed only once, so that orthogonal transformation and high efficiency
No distortion due to decoding is accumulated. Also, a high efficiency mark
Since the dubbing signal is transmitted in the encrypted state,
The rate can be lowered .

[0029]

As described above, according to the present invention, dubbing can be repeatedly performed at a low transmission rate without causing distortion of orthogonal transform or high-efficiency coding, and its practical effect is as follows. large.

[Brief description of the drawings]

Block diagram of a recording and reproducing apparatus of the digital signal according to a first embodiment of the invention; FIG

FIG. 2 is a digital digital camera according to a second embodiment of the present invention.
Illustration of the signal format of the Bing signal

FIG. 3 is a digital digital camera according to a third embodiment of the present invention.
Illustration of the signal format of the Bing signal

Block diagram of a recording and reproducing apparatus of the digital signal according to a fourth embodiment of the present invention; FIG

FIG. 5 is a block diagram showing a conventional digital recording VTR .

[Description of Code] 11a, 11b Video signal A / D converter 12a, 12b High efficiency encoder 13a, 13b Error correction encoder 14a, 14b Audio signal A / D converter 15a, 15b Audio signal encoding processor 16a, 16b Modulator 17a, 17b Magnetic recording / reproducing system 18a, 18b Demodulator 19a, 19b Error correction decoder 20a, 20b Video signal modifier 21a, 21b Audio signal decoder 22a, 22b Audio signal modifier 23a, 23b High-efficiency decoder 24a, 24b Video signal D / A converter 25a, 25b Audio signal D / A converter 26a, 26b Multiplexer 27a, 27b Separator

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideki Odaka 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] An apparatus for reproducing a digital audio signal and a digital video signal which has been highly efficient coded, wherein said digital video signal compressed on a time axis during a period in which said digital video signal is not transmitted before being subjected to high efficiency decoding. A reproducing apparatus comprising multiplexing means for multiplexing and outputting an audio signal. 2. An apparatus for recording a digital audio signal and a digital video signal encoded with high efficiency, wherein at least a multiplexed digital video / audio signal is input and said multiplexed digital video signal is input. A recording device for recording an audio signal on a medium after separating the signal into a digital video signal and a digital audio signal.