JPH05109239A - Digital signal editing method - Google Patents

Abstract

PURPOSE:To quantitatively grasp a signal deterioration amt. caused by dubbing and editing by providing an auxiliary code area for regulating the number of copying times and the number of editing times in one part of a video signal and an audio signal respectively and renewing the records according to the editing. CONSTITUTION:The area (AUX: auxiliary code) for recording the numbers of copying and editing times respectively is provided in a recording area of a digital video signal and a digital audio signal of a high efficiency coding and recording digital VTR respectively. Then, a value by adding one to the number of editing times is added as a new editing time code together with the digital video signal and the digital audio signal through a specified signal interface at the time of dubbing and editing, and is recorded in the auxiliary code area AUX. Consequently, whenever dubbing and editing are repeated, their number of times is additionally recorded, and the signal deterioration amt. caused by them can quantitatively be grasped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital signal editing method for dubbing and editing digital video signals and digital audio signals between recording and reproducing devices.

[0002]

2. Description of the Related Art In recent years, the progress of video / audio signal recording / reproducing technology using digital technology has been remarkable, but when these technologies are applied to a consumer VTR, the biggest problem is the amount of data. There are many. For example, if the transmission rate of the output video signal is 4: 2: 2 standard, it is 21.
It will be 6 Mbps, and it will be difficult to record for a long time as it is. For this reason, various high-efficiency coding systems have been proposed for video signals and audio signals, and recording / reproducing devices using high-efficiency coding techniques have been developed.

Regarding high-efficiency codes, for video signals, for example, (Okuda Haruo: "VTR coding technology", Journal of the Television Society, Vol. 45, No. 7, pp. 813-81.
9, 1991), and DCT / Hadamard transform, etc., and for speech signals, for example, (Hideki Suganami: "High-efficiency coding method for wideband acoustic signals, NHK STRL Open Research Proceedings, pp.37- 43, July 1991), where accumulation of deterioration due to re-encoding can be mentioned as a problem when using a high-efficiency code. If so, generally, the frequency component obtained by orthogonally transforming the target signal is encoded, but in orthogonal transform and inverse orthogonal transform, the number of operation digits and the number of output digits are Because of this, a digit cancellation error occurs, and a similar calculation error is predicted in the case of a voice signal.

As a conventional method for performing editing and dubbing on a video and audio signal source recorded with high efficiency encoding as described above while preventing accumulation of errors due to re-encoding, the present application Japanese Patent Application No. 3-1 previously filed by a person
6190 (digital signal dubbing method) is available.

A conventional digital signal dubbing method will be described below. FIG. 4 is a block diagram showing a configuration of a dubbing system for explaining a conventional digital signal dubbing method. 11a and 11b are video A / D converters and 12
a and 12b are high efficiency encoders, 13a and 13b are error correction encoders, 14a and 14b are voice A / D converters, 15a and 15b are voice signal encoding processors, 16a and 16b are modulators, 17a. , 17b
Is a magnetic recording / reproducing system, 18a and 18b are demodulators, 19a and 19b are error correction decoders, 20a and 20b are image modifiers, and 21a and 21
b is a voice signal decoding processor, 22a and 22b are voice modifiers,
23a and 23b are high-efficiency decoders, and 24a and 24b are video D / A.
Converters, 25a and 25b are voice D / A converters, 26a and 26b are multiplexers, and 27a and 27b are separators.

The operation of the digital signal dubbing method in the conventional dubbing apparatus configured as described above will be described below.

The input video signal is a video A / D converter
A / D conversion is performed in 11a, high efficiency encoding is performed in the high efficiency encoder 12a, and then error correction encoding is performed in the error correction encoder 13a. Further, the input voice signal is A / D converted by the voice A / D converter 14a, subjected to voice signal processing such as shuffling and error correction coding by the voice signal coding processor 15a, and then subjected to an error correction code. It merges with the video signal of the rectifier 13a. Then, it is modulated by the modulator 16a and recorded in the magnetic recording / reproducing system 17a.

The data reproduced from the magnetic recording / reproducing system 17a is demodulated by the demodulator 18a, corrected by the error correction decoder 19a, and then corrected by the video modifier 20a.
The signal obtained at this point is used as a video signal portion for dubbing output. After the voice signal decoding processor 21a has performed voice signal processing such as error correction coding and deshuffling, the voice modifier 22a corrects uncorrectable errors. The signal obtained at this point is used as the audio signal portion of the dubbing output.

A high-efficiency decoder is used for final output.
After highly efficient decoding with 23a, D with the video D / A converter 24a
The A / A converted video signal and the audio signal D / A converted by the audio D / A converter 25a are output.

For dubbing, a signal obtained by time-multiplexing the outputs of the image modifying unit 20a and the audio modifying unit 22a in the multiplexer 26a is used as a digital dubbing output.

[0011]

However, in the above-mentioned conventional configuration, it is only necessary to dubb, that is, copy, a high-efficiency-encoded video signal and audio signal from one recording medium to another recording medium. However, there is a problem that editing is not performed in the middle of the process and management of an increase in error due to re-encoding associated with editing is not taken into consideration.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a digital signal editing method having a dubbing and editing frequency management function.

[0013]

In order to achieve this object, a digital signal editing method of the present invention is an auxiliary method for defining the number of times of copying and the number of times of editing in a part of a video signal and an audio signal recorded on a recording medium. A code area is provided and the recorded contents are updated according to the conditions of dubbing and editing.

[0014]

According to the present invention, by the above method, the value indicating the number of times of copying and the number of times of editing in the auxiliary code area can be updated every time dubbing and editing are repeated, and the history thereof can be retained to manage the degree of deterioration. On the other hand, for a signal source whose image quality or sound quality is significantly deteriorated, it is possible to check the degree of deterioration by checking the value of the auxiliary code.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the structure of a dubbing system for explaining the connection between devices and the flow of signals in the first embodiment of the present invention. In FIG. 1, 1
.. are high-efficiency coded recording digital VTRs on the reproducing side, and the configuration is the same as that shown in the conventional example. 2 is a baseband recording digital VTR recorded in the 4: 2: 2 standard or the like, such as a D-2 type VTR,
3 is a conventional analog recording VTR, 4 is an editing machine, 5a, 5
b, ... are high-efficiency decoders, 6 is a video A / D converter,
Reference numeral 7 is an edit processing unit, 8 is a high-efficiency encoder, and 9 is a recording-side high-efficiency encoded recording digital VTR.

The operation of the digital signal editing method in the dubbing system of this embodiment having the above configuration will be described below.

First, when a high-efficiency coded digital video signal is recorded and reproduced, the deterioration of the generated signal is 2
Types can be considered. The first is signal deterioration due to recording and reproduction, and data exceeding the limit of error correction capability is modified and deteriorates. The second is the deterioration of the signal due to the repetition of high-efficiency encoding / decoding, that is, re-encoding.
In the present embodiment, a recording area of an auxiliary code called a copy and edit number code is provided in the recorded video signal to manage the first and second deteriorations. In FIG. 1, 1a, 1b, ... A high-efficiency coded recording digital VTR records a video signal compressed by high-efficiency coding and a copy and edit count code having a certain value. At the time of reproduction, the dubbing interface format shown in the conventional example outputs a high-efficiency coded digital video signal, a copy count code obtained by adding 1 to the reproduced value, and an edit count code as reproduced. Is input to the editing machine 4. Since it is difficult to perform editing processing such as composition and special effects on a video signal that remains high-efficiency coded, decompression is performed by the high-efficiency decoders 5a, 5b, ... Return to baseband signal. At the same time, the baseband recording digital VTR2
From the analog recording VTR 3 which has been used conventionally. In the case of an analog video signal, the video A / D converter 6 converts it into a digital video signal. Of course, 1a, 1b,
Each of the VTRs 2 and 3 may have one system or a plurality of systems. Each input video signal is subjected to predetermined editing by the editing processing unit 7 and then compressed again by the high-efficiency decoder 8, and a value obtained by adding 1 to the simultaneously input editing frequency code is added to the new editing frequency. Added as a code,
High efficiency coding recording digital VT output from the editing machine 4
Recorded in R9.

High-efficiency coded recording digital VTR 1a, 1
For example, as shown in (a) or (b) of FIG. 3, a synchronization block, which is a basic unit for recording a digital video signal or an audio signal, is used as a method of recording a code indicating the number of times of copying and editing to b and 9. An auxiliary code area indicated by AUX may be provided in the front part or the rear part of the synchronization block, and the copy and edit codes may be allocated in the auxiliary code area.

As for the method of defining the copy and edit number codes, both of the original images are 0,
The value increases each time copying and editing are repeated with the digital dubbing interface shown in the conventional example. In the case of a baseband recording digital VTR, there are many interfaces that do not have a function for managing the number of copies and edits. However, in this case also, it may be regarded as an original signal and both copies and edits may be treated as 0, or another rule may be specified. You can go. Similarly, also in the case of analog video, it may be regarded as conversion of the recording medium and treated as 0, or another regulation may be performed.

Further, when the number of times of copying and editing of video signals of a plurality of systems input to the editing machine 4 are different, it may be prescribed to take each maximum value, or another regulation may be made. good.

Further, the update of the copy code is supposed to be performed at the time of reproduction, but of course, it may be specified to be performed at the time of recording.

FIG. 2 is a block diagram showing the structure of a dubbing system for explaining the connection between devices and the flow of signals in the second embodiment of the present invention. In the figure, 10
a is a high-efficiency coded recording digital VTR on the reproducing side, 10b
Is a high-efficiency coded recording digital VTR on the recording side, and the above is the same as the configuration of FIG. The difference from FIG. 1 is that the VTRs are directly connected to each other without using an editing machine, that is, on the premise of dubbing or assembly editing. In this case, since the deterioration due to re-encoding does not occur, the number of edits does not change, and only the number of copies increases.

As described above, according to this embodiment, an area for recording the number of times of copying and the number of times of editing is provided in the video signal recording area of the high-efficiency coded recording VTR, and the number of times recording is defined. , High efficiency coded recording digital V
Even if you copy and edit using TR,
It is possible to quantitatively grasp the amount of deterioration accompanying this.

In the first and second embodiments, the high efficiency coded and recorded signal has been described by exemplifying only the video signal, but of course only the audio signal may be used. It goes without saying that both may be used.

[0026]

As described above, according to the digital signal editing method of the present invention, an auxiliary code area for defining the number of times of copying and the number of times of editing is provided in a part of a video signal and an audio signal recorded on a recording medium to perform dubbing and With the configuration that the recorded contents are updated according to the execution condition of the editing, the history is retained each time the dubbing and the editing are repeated,
It is possible to control the degree of deterioration and, on the contrary, for a signal source whose image quality or sound quality is significantly deteriorated, it is possible to check the degree of deterioration by checking the value of the auxiliary code.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a dubbing system for explaining an inter-device connection and a signal flow in a first embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of a dubbing system for explaining the connection between devices and the flow of signals in the second embodiment of the present invention.

FIG. 3 is a schematic diagram showing an arrangement example of an auxiliary code area for recording the number of times of copying and editing in the embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a dubbing system for explaining a conventional digital signal dubbing method.

[Explanation of symbols]

 1a, 1b High-efficiency coded recording digital VTR 2 for playback side Baseband recording digital VTR 3 Analog recording VTR 4 Editing machine 5a, 5b High-efficiency decoder 6 Video A / D converter 7 Editing processing section 8 High-efficiency coding Coder 9 High efficiency coding recording digital VTR on recording side

Claims (6)

[Claims] 1. A signal transmission between a device having a recording / reproducing function of a high-efficiency-encoded digital video signal and a code indicating the number of times of copying and the number of times of editing, the digital video signal and a code of the number of times of copying and editing at the reproducing side. Is reproduced, and the high-efficiency coded video signal, the reproduction frequency code as it is reproduced, and the value obtained by adding 1 to the reproduced copy frequency code are output as a new copy frequency code, and the reproduced signal is dubbed. In this case, the recording side records the received signal as it is on the recording side. 2. When a signal output from the reproducing side is received by an editing machine, high-efficiency decoding of a digital video signal is performed, predetermined video editing is performed, and then high-efficiency encoding is performed again for output. The high-efficiency decoding / encoding is performed once, and the value obtained by adding 1 to the editing count code received by the editing machine is output as a new editing count code from the editing machine, and the signal received on the recording side. Is recorded as it is, The digital signal editing method according to claim 1, wherein 3. A plurality of signals output from a plurality of playback devices are received by an editing device, high-efficiency decoding of each digital video signal is performed, and predetermined video editing such as synthesis of each video and special effect is performed. After that, when performing high-efficiency encoding again and outputting, when the copy and edit count codes of the input video signals are different, the copy and edit count codes output from the editing machine are the copy and edit count codes. 3. The digital signal according to claim 2, wherein a value obtained by adding 1 to the largest value is output from the editing machine as a new copy and edit number code, and the received signal is recorded as it is on the recording side. Signal editing method. 4. The high-efficiency coding when a part of the plurality of video signals received by the editing machine is a digital video signal that has not been high-efficiency coded or is an analog video signal. 4. The digital signal editing method according to claim 3, wherein 0 is used as a copy and edit count code for a digital video signal which has not been subjected to the above-mentioned processing or an analog video signal. 5. The same process is performed on a high-efficiency coded digital audio signal.
The digital signal editing method described in 2, 3, or 4. 6. A high-efficiency-encoded digital video signal and a high-efficiency-encoded digital audio signal are independently provided with copy and edit count code recording areas, respectively.
The digital signal editing method according to claim 1, wherein the processing and management are performed independently of each other.