JPH07250307A - Signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain a signal recording and reproducing device in which an auxiliary signal for number of picture elements and an aspect ratio required for generating an output picture is easily acquired and a high quality picture output in compliance with a picture format at usual reproduction is attained even at high speed reproduction. CONSTITUTION:A fixed length packet and a variable length packet of an input signal are detected by header detectors 4, 6. Furthermore, a header of a picture signal is detected by a header detector 9 and a high sped reproduction data generator 10 generates data required for high speed reproduction. A recording signal identification device 18 identifies each recording information recorded on a magnetic tape. Each of extract devices 19-22 extracts each information based on the result of identification. A usual reproduction output or a high speed reproduction output is selected at usual reproduction or at high speed reproduction and an output packet device 24 outputs the output in a prescribed packet form.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal recording / reproducing apparatus, and more particularly to an apparatus for recording / reproducing a digital image signal.

[0002]

2. Description of the Related Art In a conventional digital VTR, when a signal already compressed by an external device or a television signal compressed by inter-picture coding is recorded, the input data is directly recorded. It was playing.

FIG. 3 shows the configuration of a conventional digital VTR. In the following, components having the same number have the same configuration and function. In FIG. 3, 1 is an input terminal, 2
Is an output terminal, 12 is an error correction encoder, 13 is a modulator,
Reference numeral 14 is a demodulator, 15 is an error correction decoder, 16 is a recording / reproducing head, 17 is a magnetic tape, and 26 is a switch.

First, the screen data of the input image signal is input from the input terminal 1, is subjected to error correction coding by the error correction encoder 12 and is modulated by the modulator 13, and then is recorded on the magnetic tape 17 by the recording / reproducing head 16. Recorded above.

At the time of reproduction, the data read by the recording / reproducing head 16 from the magnetic tape 17 is demodulated by the demodulator 14, error-corrected by the error-correction decoder 15 and output to the output terminal 2.

[0006]

However, in the above conventional configuration, the input data is the international standard ISO-1381.
In the case of data compressed by inter-picture coding as in No. 8, there are the following problems.

The first problem is that the reproducing head scans across the recording tracks during high-speed reproduction, so that even if the screen data necessary for screen decoding can be scanned, the decoder starts the decoding operation. It is not possible to reproduce the auxiliary signal necessary for

The second problem is that in a digital VTR that does not have a built-in decoder, it is necessary to transmit data necessary for decoding to the decoder, but it is necessary for transmission due to the same cause as in the first problem. Data is missing.

Further, in the above-mentioned conventional configuration, since protection of copyright is not taken into consideration in recording / reproducing a digital signal, dubbing with very little deterioration in image quality can be easily performed, and there is a concern that illegal duplication is widespread. Had the problem of.

Further, in the above-mentioned conventional configuration, when the interfering signal is superposed on the input signal, it is meaningless to generate the high-speed reproduction data unless the interfering signal is removed, and the recording medium is wasted. It had a fourth problem of becoming.

[0011]

In order to solve the above-mentioned first problem of the prior art, the first invention comprises a recording section and a reproducing section, and the recording section transmits in a predetermined fixed length packet format. Fixed-length packet header detection means for inputting a signal to be input as an input signal, detecting and outputting first header information from the fixed-length packet, and packet format detection means for detecting a variable-length packet position from the input signal. Variable length packet header detection means for detecting and outputting second header information of the variable length packet from a predetermined position in the variable length packet, and variable length packet in the variable length packet from a predetermined position in the variable length packet Data ID detecting means for detecting an ID code indicating the data type, and image signal selecting means for outputting the data in the variable length packet in which the data type is an image signal, Image main signal / auxiliary signal detecting means for detecting and outputting an image main signal forming an in-screen decoded screen and a decoding auxiliary signal necessary for forming the in-screen decoded screen from the output of the image signal selecting means A high-speed reproduction image main signal generating means for generating a high-speed reproduction image main signal using a part or all of the image main signal, the input signal, the high-speed reproduction image main signal, the decoding auxiliary signal, and the first Of the header information and the second header information into a predetermined recording signal format, and a recording means for recording the output of the recording format conversion means on a recording medium. Reproduction means for obtaining a reproduction signal from a medium, the input signal, the high-speed reproduction image main signal, the decoding auxiliary signal, and the first signal from the reproduction signal
Recording information identifying means for identifying the header information and the second header information, reproduction signal selecting means for selecting and outputting the high-speed reproduction image main signal and the decoding auxiliary signal at least during high-speed reproduction, and a high-speed reproduction screen. A high-speed reproduction signal generating means for generating a high-speed reproduction signal necessary for decoding from the high-speed reproduction image main signal and the decoding auxiliary signal;
A packetizing means for switching between the normal reproduction output of the reproduction signal selecting means and the output of the high speed reproduction signal generator for normal reproduction and high-speed reproduction and for inputting and outputting in a predetermined packet format.

In order to solve the above-mentioned second problem of the prior art, a second invention inputs a signal transmitted in a predetermined fixed-length packet format as an input signal, and outputs a first header from the fixed-length packet. Fixed-length packet header detection means for detecting and outputting information, packet format detection means for detecting a variable-length packet position from the input signal, and second from the predetermined position in the variable-length packet of the variable-length packet Variable-length packet header detecting means for detecting and outputting header information; data ID detecting means for detecting an ID code indicating the data type in the variable-length packet from a predetermined position in the variable-length packet; An image signal selection means for outputting the data in the variable length packet of which type is an image signal, and an output of the image signal selection means constitute an in-screen decoding screen. Image main signal / auxiliary signal detection means for detecting and outputting an image main signal and a decoding auxiliary signal necessary for constructing the intra-screen decoded screen, and a high-speed reproduced image main signal as a part of the image main signal. Alternatively, a high-speed reproduction image main signal generating means for generating all of them, the input signal, the high-speed reproduction image main signal, the decoding auxiliary signal, the first header information, and the second header information are predetermined recording signals. Recording format converting means for converting into a format, recording means for recording the output of the recording format converting means on a recording medium, reproducing means for obtaining a reproduced signal from the recording medium, the input signal and the high-speed reproduced image from the reproduced signal Recording signal identification means for identifying the main signal, the decoding auxiliary signal, the first header information and the second header information, and the high speed at least during high speed reproduction Reproduction signal selecting means for selecting and outputting a raw image main signal and the first header information and the second header information, and a high-speed reproduction image main signal for reproducing a high-speed reproduction signal necessary for decoding a high-speed reproduction screen. And a high speed reproduction signal generating means for generating from the first header information and the second header information, a normal reproduction output of the reproduction signal selecting means and a high speed reproduction signal generator for the normal reproduction and the high speed reproduction. Packetizing means for switching between output and input and outputting in a predetermined packet format.

In order to solve the above-mentioned third problem of the related art, a third invention is a decoding judgment signal detecting means for detecting a duplication information signal for judging whether or not an input signal can be decoded from the input signal. When the input signal cannot be decoded by the judgment of the duplication information signal, non-decoding information adding means for adding non-decoding information to the high-speed reproduction auxiliary signal, and the non-decoding information added to the high-speed reproduction auxiliary signal The output preventing means does not output from the high-speed reproduction signal generating means for generating the high-speed reproduction signal during high-speed reproduction.

In order to solve the above-mentioned conventional fourth problem, a fourth invention is a decoding judgment signal detecting means for detecting an interference information signal for judging whether or not an input signal can be decoded from the input signal. And a non-decoding information attaching means for adding non-decoding information to the high speed reproduction auxiliary signal when the input signal cannot be decoded by the judgment of the interference information signal, and a case where the non-decoding information is added to the high speed reproduction auxiliary signal. The output preventing means does not output from the high-speed reproduction signal generating means for generating the high-speed reproduction signal during high-speed reproduction.

[0015]

In the first aspect of the present invention, the auxiliary signals such as the number of pixels and the aspect ratio necessary for generating the output image can be easily obtained, so that the high-quality image output conforming to the image format at the normal reproduction can be obtained even at the high speed reproduction. It will be possible.

In the second aspect of the invention, the packet header information required for the variable-length and fixed-length packet formats is also recorded, which facilitates packetization at the time of output. As a result, the high-speed reproduction signal can be output with the same image format as in normal reproduction, and high image quality can be obtained during high-speed reproduction.

Further, in the third aspect of the invention, when the interfering signal is superimposed on the input signal, the high-speed reproduction cannot be always performed when the high-speed reproduction is impossible, and it becomes unnecessary to perform meaningless high-speed reproduction.

Further, in the fourth aspect of the present invention, the copyright protection is taken into consideration in recording / reproducing the digital signal, and there is less concern that illegal copying will take place.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of the first embodiment of the present invention. In the following, components having the same number have the same configuration and function.

In FIG. 1, 1 is an input terminal, 2 is an output terminal, 3 is a memory, 4 is a fixed-length packet header detector, 5
Is a packet type detector, 6 is a variable length packet header detector, 7 is an ID detector, 8 is an image signal selector, 9 is an image signal header detector, 10 is a high speed reproduction data generator, 11
Is a recording format converter, 12 is an error correction encoder,
Reference numeral 13 is a modulator, 14 is a demodulator, 15 is an error correction decoder, 16 is a recording / reproducing head, 17 is a magnetic tape, 18 is a recording signal discriminator, 19 is a high speed reproduction data extractor, 2
Reference numeral 0 is an image signal header extractor, 21 is a variable length packet header extractor, 22 is a fixed length packet header extractor, 23 is a high speed reproduction signal output device, 24 is an output packet device, and 25 and 26 are switches.

The input signal input is input from the input terminal 1 and temporarily stored in the memory 3. In the memory 3, the input signal is divided into fixed length packets each having a fixed code length,
It outputs to the fixed length packet header detector 4 and the recording format converter 11. Fixed-length packet header detector 4
Then, the position of the header information in the fixed length packet is recognized, and the header information is output to the recording format converter 11. The signals other than the header information in the fixed length packet are output to the packet format detector 5. In the packet type detector 5, a plurality of fixed length packets output from the fixed length packet header detector 4 are input, a variable length packet is formed, and the variable length packet is output to the variable length packet header detector 6. The variable-length packet header detector 6 recognizes the position of the variable-length packet header existing in the variable-length packet, takes out the variable-length packet header, and outputs it to the recording format converter 11 in the same manner as the fixed-length packet header. The variable length packet after the variable length packet header is taken out is output to the ID detector 7. After the ID information for identifying each variable-length packet is detected by the ID detector 7, the variable-length packet is output to the image signal selector 8 together with the ID.

The image signal selector 8 discriminates whether the variable-length packet input from the ID detector is a packet containing an image signal or a signal other than the image signal, for example, a voice signal, and the inside of the packet. If the signal is related to an image signal, the variable length packet is output to the image signal header detector 9.

FIG. 4A shows a fixed length packet and FIG.
(B) shows a variable length packet. In FIG. 4, 101,
Reference numerals 104, 106 and 108 denote fixed-length packet headers, 102, 110, 112 denote variable-length packet headers, 103, 105, 107, 109, 111, 1
Reference numeral 13 indicates a recording signal.

The fixed length packet header detector 4 is shown in FIG.
(A) is the position of header information in the fixed-length packet, that is, fixed-length packet headers 101, 104, 106, 108.
Is detected and the header information is output to the recording format converter 11. The signals other than the header information in the fixed-length packet are 102, 103, 105, 10
7 and 109 are output to the packet type detector 5.

In the packet type detector 5, a variable length packet composed of 110 and 111 is formed as a variable length packet header 102 as shown in FIG. 4B. Figure 4
102 in (a) and 110 in FIG. 4 (b) show the same header. The recording signal 111 is a collection of data in a plurality of fixed-length packets, that is, 103 and 10 in FIG.
Data with 5 and 107 added are shown.

The image signal selector 8 outputs to the image signal header detector 9 when the signal inside the packet among the variable length packets shown in FIG. 4 (b) is related to the image signal. The image signal header detector 9 outputs auxiliary information such as the number of pixels and aspect ratio required for decoding the image signal to the recording format converter 11. The signals inside the packet other than the auxiliary signal are output to the high speed reproduction data generator 10. The high-speed reproduction data generator 10 converts the signal inside the packet into high-speed reproduction data necessary for high-speed reproduction, and outputs it to the recording format converter 11.

The manner in which the signal inside the packet is converted into the data for high speed reproduction necessary for high speed reproduction will be described below.

IS is a typical video signal encoding system.
There is O-13818, commonly called MPEG2. This method
The redundancy in the time direction is reduced by the inter-frame predictive coding, and the redundancy in the spatial direction is reduced by the 8 × 8 pixel two-dimensional discrete cosine transform (DCT). Furthermore, when inter-frame prediction is performed, motion compensation is used to reduce prediction errors and improve coding efficiency.

For example, the input image is divided into macroblocks of 16 × 16 pixels, the motion vector is encoded for each macroblock, and the reproduced image of the previous screen is shifted by the motion vector and the encoded pixel value. The difference is encoded.
At that time, the motion vector is encoded as additional information of the macroblock. The coded data is hierarchically structured in consideration of error countermeasures against the difference between screens and special reproduction.

This hierarchical data structure is shown in FIG. GOP (Group of Pictures) that combines several screens
The unit is called. Also, a plurality of GOPs are combined to form a video sequence. During GOP, all macroblocks are in Intra (intra-frame coding) mode, I-picture, which is a screen, Inter (inter-frame predictive coding) mode and P-picture which can select Intra mode, and bidirectional prediction are allowed. Three screen types of picture are used.

In the case of MPEG, 8 × 8 for luminance signal
The block consists of 4 blocks and the color difference signal 8 × 8 block consists of 2 blocks, totaling 6 blocks.
By providing a frame and an I picture, error propagation due to interframe coding is prevented and editing is possible.

In Intra mode, D required for encoding
In order to reduce the amount of additional information of the DC component of the CT coefficient,
When the immediately preceding block is the Intra mode, the difference from the DC component is variable length coded. In particular, in the I-picture, all macroblocks are in the Intra mode, so the differential encoding of the DC component is continuous and the efficiency is improved. Further, the motion vector is also variable length coded in order to reduce the amount of additional information required for coding, and the difference from the motion vector of the previous macroblock.

As a unit of the above variable length coded sequence, M
A layer called BS (macroblock slice) is defined. This is a one-dimensional structure composed of an arbitrary number of macroblocks.

In the recording format converter 11, the memory 3 is used.
Input signal output from the fixed-length packet header detector 4
Information in the fixed length packet output from the variable length packet, the header information in the variable length packet output from the variable length packet header detector 6, the auxiliary information of the image signal output from the image signal header detector 9, and the high speed reproduction data generator. At 10, the high speed reproduction data after the high speed reproduction data conversion is input. In order to record the above signals at an arbitrary position on the magnetic tape, the recording format converter 11 performs formatting.

In the image header detector, the variable length packet signals 111 and 113 shown in FIG. 4 (b) have the structures shown in FIGS. Each of the video sequence, GOP, and picture shown in FIG. 5 has header information which is information necessary for decoding. FIG. 6 shows an example of the arrangement of each head. That is, a sequence header is added for each video sequence, a GOP header is added for each GOP, and a picture header is added for each picture sequence. The auxiliary information of the image signal output from the image signal header detector 9 indicates the information of these headers.

FIG. 7 shows an arrangement example in a variable length packet in a layer below the picture signal other than the header information. Figure 7
(A) shows a picture signal, (b) shows an MBS signal in the picture signal, (c) shows a macroblock signal in the MBS signal, and (d) shows 6 in the macroblock signal.
The block signal is shown. When generating high-speed playback data, the picture signal of the variable length packet is the I
Only use packets with pictorial contents. Also, the DC with the fixed code length of each block shown in FIG.
(DC component) value, AC (AC component) value with variable code length, and EOB added to each block end
(End of block) is extracted to generate high-speed playback data.

The output data from the recording format converter 11 is recorded on the magnetic tape 17 by the recording / reproducing head 16 after being modulated by the error correction encoder 12 and the error correction encoder / modulator 13.

Next, the operation during reproduction will be described. The data read by the recording / reproducing head 16 from the magnetic tape 17 is demodulated by the demodulator 14, and the error correction decoder 1
The error is corrected by 5 and is input to the recording signal discriminator 18.

In the case of normal reproduction, the input signal from the recording signal discriminator 18 is input to the output packet unit 24 through the switch 25, the output packet unit 24 converts the signal into the packet format, and the output terminal 2 outputs the signal. .

In the case of high-speed reproduction, if the signal identified by the recording signal identification device 18 is high-speed reproduction data, go to the high-speed reproduction data extractor 19, and if the signal is auxiliary information of the image signal, extract the image signal header extractor. 20 to the variable-length packet header information to the variable-length packet header extractor 21, and to the fixed-length packet header information to the fixed-length packet header extractor 22.

The high-speed reproduction data extractor 19 arranges the data for high-speed reproduction in order to generate a high-speed reproduction signal, and outputs it to the high-speed reproduction signal output unit 23. In the high-speed reproduction data extractor 19, the DC value shown in FIG.
A signal of each block is formed from the C value and EOB, and is output to the high speed reproduction signal output device 23. The image signal header extractor 20 outputs auxiliary information such as the number of pixels and aspect ratio required for decoding the high speed reproduction signal to the high speed reproduction signal output device 23.

The image signal header extractor 20 shown in FIG.
The sequencer, GOP, and Viccia headers indicated by are output to the high-speed reproduction signal output unit 23. The variable-length packet header extractor 21 and the fixed-length packet header extractor 22 output packet information necessary for outputting the high-speed reproduction signal in the packet format to the high-speed reproduction signal output device 23. Variable-length packet header ejector 21 and fixed-length packet header ejector 22
Then, the variable-length packet header and the fixed-length packet header shown in FIG. 4 are output to the high-speed reproduction signal output device 23.

The high-speed reproduction signal output device 23 decodes the high-speed reproduction signal by using the high-speed reproduction data and auxiliary information for decoding, and outputs from the variable-length packet header extractor 21 and the fixed-length packet header extractor 22. The variable-length packet header information and the fixed-length packet header information are used to add packet information necessary for outputting in packet format to form a high-speed reproduction signal.

That is, after generating video sequence data for high speed reproduction using the signals and sequences of each block, GOP, and each header of the victim, a variable length packet header is added to form a variable length packet, and a fixed length packet header is formed. To form a fixed length packet. The high speed reproduction signal is output from the output terminal 2 through the switch 25.

As described above, in the first embodiment, when the high speed reproduction signal is output, it is necessary to generate the high speed reproduction data and the decoded signal in addition to the signal output during the normal reproduction. By recording the information, the decoding process of the high-speed reproduction signal can be easily performed as in the normal reproduction. Also, since the packet header information required for the variable length and fixed length packet formats is also recorded, the packetization at the time of output becomes easy. As a result, the high-speed reproduction signal can be output with the same image format as that in normal reproduction, and high-quality output can be obtained during high-speed reproduction.

The fixed length packet header detector 4, the variable length packet header detector 6, and the image signal header detector 9 detect the respective header information or auxiliary information at the time of decoding and input it to the recording format converter 11. However, all of the header information and the auxiliary information at the time of decoding may be extracted and input, or only the minimum necessary information when actually outputting from the output terminal 2 is recorded. You can enter to.

In the first embodiment, the high-speed reproduction data is formed by the fixed code length DC, the variable code length AC (AC component), and the EOB added to each block end. Other signals such as only DC or high frequency components of DC and AC may be used.

The high-speed reproduction signal output unit 23 adds the fixed-length packet header information and the variable-length packet header information as the packet header information after decoding the high-speed reproduction signal, but it depends on the output form from the output terminal 2. However, only variable-length packet header information may be added.

Also, in the recording format converter 11, a signal having a rate corresponding to the difference between the recording rate when recording on the magnetic tape 17 and the input rate of the data input to the recording format converter 11 is added as an additional signal. It doesn't matter. In this case, at the time of reproduction, the recording signal discriminator 18 determines whether or not it is the preceding additional signal,
The additional signal is not output from the recording signal discriminator 18 during normal reproduction and high-speed reproduction.

FIG. 2 shows a block diagram of the second embodiment of the present invention. In FIG. 2, 27 is a decryption information detector, 28 is a decryption information adder, 29 is a recording format converter, 30 is a recording signal discriminator, 31 is a decryption information extractor, and 31 is a switch. In FIG. 2, the fixed-length packet header detector 4 recognizes the position of the header information in the fixed-length packet and outputs the header information to the decoding information detector 27. The decoding information detector 27 detects an interference information signal for the input signal in the header information. The detected interference information signal is input to the decoding information adder 28, and the decoding information adder 28 records an interference flag indicating whether the input signal can be reproduced by the recording information converter 2 in the format converter 2
Output to 9.

The variable-length packet header detector 6 recognizes the position of the header information in the variable-length packet similarly to the fixed-length packet header detector 4, and outputs the header information to the decoding information detector 27. The decoding information detector 27 detects an interference information signal for the input signal in the header information.
The detected interference information signal is input to the decryption information adder 28, and the decryption information adder 28 outputs an interference flag indicating whether the input signal can be reproduced by the interference information signal to the recording format converter 29. To do.

In the recording format converter 29, the input signal output from the memory 3, the header information in the fixed-length packet output from the fixed-length packet header detector 4, and the variable-length packet output from the variable-length packet header detector 6 are stored. Header information, auxiliary information of the image signal output from the image signal header detector 9, and data generator 10 for high-speed reproduction
The high-speed reproduction data after the high-speed reproduction data conversion is input at. In order to record the above signals at an arbitrary position on the magnetic tape, the recording format converter 29 performs formatting. Hereinafter, the recording operation is the same as in the first embodiment.

Next, the operation during reproduction will be described. The data after error correction by the error correction decoder 15 is input to the recording signal discriminator 18. When the reproduction is the normal reproduction, it is the same as in the first embodiment.

In the case of high speed reproduction, if the signal discriminated by the recording signal discriminator 18 is the interference flag added by the decryption information adder 28, it is output to the decryption information extractor 31. Further, in the decryption information take-out device 31, when the interference flag indicates that the input signal can be reproduced, control for inputting the output signal from the high-speed reproduction signal output device 23 to the output packet device 24 through the switch 31. If the interference flag indicates that the input signal cannot be reproduced, the switch 31 is controlled so that the output signal from the high-speed reproduction signal output device 23 is not output to the output packet device 24. The output signal from the high-speed reproduction signal output device 23 is output from the output terminal 2.

As described above, in the second embodiment, in addition to the recording / reproducing operation of the first embodiment, the interference information signal of the input signal is recorded separately from the input signal, so that high-speed reproduction is impossible. In such a case, high-speed reproduction cannot be performed without necessity, and it becomes unnecessary to perform meaningless high-speed reproduction.

In the second embodiment, similarly to the first embodiment, in the fixed length packet header detector 4, the variable length packet header detector 6, and the image signal header detector 9, respective header information or decoding information at the time of decoding is obtained. Although the auxiliary information is detected and input to the recording format converter 29, all of the header information and the auxiliary information at the time of decoding may be extracted and input, or actually output from the output terminal 2. At this time, only the minimum necessary information may be input to the recording format converter 29.

Further, as in the first embodiment, the high speed reproduction data is formed by the fixed code length DC, the variable code length AC (AC component), and the EOB added to each block end. Alternatively, other signals such as high frequency components of DC and AC may be used.

In the high-speed reproduction signal output device 23, fixed-length packet header information and variable-length packet header information are added as packet header information after the high-speed reproduction signal is decoded, but it depends on the output form from the output terminal 2. However, only variable-length packet header information may be added.

Further, in the second embodiment, as in the first embodiment, the recording rate at the time of recording on the magnetic tape 17 by the recording format converter 29 and the input rate of the data input to the recording format converter 29. A signal having a rate corresponding to the difference may be added as an additional signal. In this case, at the time of reproduction, the recording signal discriminator 18 determines whether or not it is the preceding additional signal, and the additional signal is not output from the recording signal discriminator 18 during both normal reproduction and high-speed reproduction.

Further, although the decoding information detector 27 detects the interference information signal with respect to the input signal in the header information, a duplicate information signal may be detected instead of the interference information signal. In this case, the detected duplication information signal is input to the decryption information adder 28, and the decryption information adder 28 indicates by the duplication information signal whether the input signal can be reproduced, that is, whether the duplication is possible. The duplication flag is output to the recording format converter 29. Then, at the time of reproduction, if the signal identified by the recording signal identifier 18 is a duplication flag, it is output to the decryption information extractor 31, and the decryption information extractor 31 indicates that the duplication flag can be duplicated with respect to the input signal. In this case, control is performed to input the output signal from the high-speed reproduction signal output device 23 to the output packet device 24 through the switch 31, and when the copy flag indicates that the input signal cannot be copied, The switch 31 is controlled so that the output signal from the high speed reproduction signal output device 23 is not output to the output packet device 24.

Alternatively, when the decryption information adder 28 obtains the duplicate information signal, the number of duplications up to that point is counted, and if the count value is equal to or greater than a certain threshold value, the duplication flag is not duplicatable, and is less than the threshold value. Then, the duplication flag is output as the duplication flag to the recording format converter 29. In this case, copyright protection is taken into consideration, and there is less concern about illegal copying.

[0063]

As described above, according to the first aspect of the present invention, auxiliary signals such as the number of pixels and aspect ratio necessary for generating an output image can be easily obtained, so that an image for normal reproduction can be obtained even at high speed reproduction. It is possible to output high quality images conforming to the format.

In the second aspect of the invention, the packet header information required for the variable-length and fixed-length packet formats is also recorded, which facilitates packetization at the time of output. As a result, the high-speed reproduction signal can be output with the same image format as in the normal reproduction, and high image quality can be obtained in the high-speed reproduction.

Further, in the third invention, when the interfering signal is superimposed on the input signal, the high speed reproduction cannot be always performed when the high speed reproduction is impossible, and it is necessary to perform the meaningless high speed reproduction. Disappear.

Further, in the fourth invention, the protection of the copyright is taken into consideration in recording and reproducing the digital signal, and the risk of illegal duplication is reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of a signal recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a signal recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a conventional signal recording / reproducing device.

FIG. 4 is a fixed-length packet diagram and a variable-length packet diagram of the first and second embodiments of the present invention.

FIG. 5 is a diagram showing an example of an encoded signal having a hierarchical data structure.

FIG. 6 is a diagram showing an example of an encoded signal having a hierarchical data structure.

FIG. 7 is a diagram showing an example of an encoded signal having a hierarchical data structure.

[Explanation of symbols]

 4 Fixed length packet header detector 5 Packet type detector 6 Variable length packet header detector 7 ID detector 8 Image signal selector 9 Image signal header detector 10 High speed reproduction data generator 11 Recording format converter 18 Recording signal discriminator 19 High-speed playback data extractor 20 Image signal header extractor 21 Variable-length packet header extractor 22 Fixed-length packet header extractor 23 High-speed reproduction signal output device 24 Output packet device 27 Decoding information detector 28 Decoding information adder 29 Recording format converter 31 Decryption information extractor

Claims (6)

[Claims] 1. A recording unit and a reproducing unit, wherein the recording unit inputs a signal transmitted in a predetermined fixed length packet format as an input signal and detects first header information from the fixed length packet. Fixed-length packet header detecting means for outputting the variable-length packet header, packet format detecting means for detecting the variable-length packet position from the input signal, and second header information of the variable-length packet from a predetermined position in the variable-length packet And a variable-length packet header detecting means for outputting the data code, a data ID detecting means for detecting an ID code indicating the data type in the variable-length packet from a predetermined position in the variable-length packet, and the data type is an image signal. Image signal selecting means for outputting the data in the variable length packet, and an image main forming an in-screen decoded screen from the output of the image signal selecting means. Image main signal for detecting and outputting a decoded auxiliary signal required to configure No. and the intra decoded picture /
Auxiliary signal detection means, high-speed reproduction image main signal generation means for generating a high-speed reproduction image main signal using a part or all of the image main signal, the input signal, the high-speed reproduction image main signal, and the decoding auxiliary signal A recording format conversion means for converting the first header information and the second header information into a predetermined recording signal format, and a recording means for recording the output of the recording format conversion means on a recording medium, The reproducing unit identifies reproducing means for obtaining a reproduced signal from a recording medium, and the input signal, the high-speed reproduced image main signal, the decoding auxiliary signal, the first header information, and the second header information from the reproduced signal. Recording signal identification means, at least during high-speed reproduction, the high-speed reproduction image main signal, the decoding auxiliary signal, the first header information, and the second Reproduction signal selecting means for selecting and outputting the joystick information, and a high-speed reproduction signal necessary for decoding the high-speed reproduction screen, the high-speed reproduction image main signal, the decoding auxiliary signal, the first header information, and the second A high-speed reproduction signal generating means for generating from the header information of the above, and the normal reproduction output of the reproduction signal selecting means and the output of the high-speed reproduction signal generator are inputted by switching between the normal reproduction and the high-speed reproduction. And a packetizing unit for outputting the signal. 2. The recording format converting means generates an additional signal which is a signal having a rate corresponding to the difference between the recording rate of the recording medium and the input transmission rate of the input video signal, and outputs the additional signal in a predetermined packet format as an additional signal packet. 2. The signal recording / reproducing apparatus according to claim 1, further comprising: an additional signal generating means for performing the operation. 3. A decoding judgment signal detecting means for detecting a decoding judgment signal from the input signal for judging whether or not the input signal can be decoded, and non-decoding if the input signal cannot be decoded by the judgment of the decoding judgment signal. From non-decoding information adding means for adding information to the high-speed reproduction auxiliary signal, and high-speed reproduction signal generating means for generating a high-speed reproduction signal when the non-decoding information is added to the high-speed reproduction auxiliary signal and at the time of high-speed reproduction. A signal recording / reproducing apparatus having an output preventing unit that does not output the signal. 4. The signal recording / reproducing apparatus according to claim 3, wherein the decoding judgment signal detecting means judges whether or not the input signal can be decoded by the interference information signal of the input signal. 5. The signal recording / reproducing apparatus according to claim 3, wherein the decoding judgment signal detecting means judges whether or not the input signal can be decoded by the duplication information signal of the input signal. 6. The signal recording / reproducing apparatus according to claim 5, wherein the decoding judgment signal detecting means judges whether or not the input signal can be decoded by the number of times of copying.