Recording and/or reproducing apparatus which produces main information and historical information with respect to signal processing performed on the main information

A dubbing system, comprising:

• a reproducing system comprising:
• (a) reproducing means for reproducing coded image data coded by a high efficiency coding method and historical information indicating whether the coded image data was concealed at a previous time;
• (b) error correcting means for correcting a code error in the image data reproduced by said reproducing means, said error correcting means providing error correcting information indicating whether error data which cannot be corrected by said error correcting means is in the image data reproduced by said reproducing means;
• (c) first concealing means for forming coded image data coded by the high efficiency coding method for the error data according to the error correcting information;
• (d) decoding means for decoding the coded image data provided by said first concealing means;
• and
• (e) second concealing means for forming decoded data, which has been decoded by said decoding means, for the error data according to the historical information and to the error correcting information,
• said second concealing means forming the decoded image data for the error data by using decoded image data decoded by said decoding means;
• and
• (f) outputting means for outputting the coded image data to be provided to said decoding means, the historical information and the error correcting information;
• and
• a recording system comprising:
• (a) inputting means for inputting the coded image data which have been output by said outputting means, the historical information, and the error correcting information;
• (b) coding means for coding the image data by the high efficiency coding method;
• (c) selecting means for selecting signals from (i) the coded image data, historical information and error correcting information, which have been input by said inputting means and (ii) the coded image data which have been coded by said coding means;
• (d) error-correction coding means for performing error-correction coding on the output of said selecting means;
• and
• (e) recording means for recording the coded image data, which have been subjected to said error-correction coding, the historical information and the error correcting information on a recording medium.

A reproducing apparatus, comprising:

• an image data reproducer for reproducing coded digital image data coded by a high efficiency coding method and concealment data indicating whether the coded digital image data was concealed at a previous time;
• an error corrector for correcting an error in the coded digital image data reproduced by said image data reproducer, and for providing error correcting information indicating whether error data which cannot be corrected by said error corrector is in the coded digital image data reproduced by said image data reproducer;
• and
• an error data concealor for replacing the error data according to the error correcting information provided by said error corrector and the concealment data reproduced by said image data reproducer, by using other coded digital image data so as to conceal the error data.

A reproducing apparatus for reproducing and processing coded digital image data, formed by subjecting digital image data to a discrete cosine transform and coding discrete cosine transform coefficients of the digital image data by a variable length coding method, said apparatus comprising:

• an image data reproducer for reproducing the coded digital image data, an error correction check code, and concealment data indicating whether the coded digital image data was concealed at a previous time;
• an error corrector for correcting an error in the coded digital image data reproduced by said image data reproducer by using the error correction check code, and for providing error correcting information indicating whether error data which cannot be corrected by said error corrector is in the coded digital image data reproduced by said image data reproducer;
• and
• a concealor for replacing the error data according to the error correcting information provided by said error corrector and the concealment data reproduced by said image data reproducer, by using another variable length code so as to conceal the error data.

A reproducing apparatus, comprising:

• reproducing means for reproducing digital image data coded by a high efficiency coding method and concealment data indicating whether the coded digital image data was concealed at a previous time;
• error correction means for correcting errors in the coded digital image data reproduced by said reproducing means by using error correction codes, said error correcting means providing error correction information indicating whether error data which cannot be corrected by said error correction means is in the coded digital image data reproduced by said reproducing means;
• conceal means for forming coded image data coded by the high efficiency coding method to replace error data which cannot be corrected by said error correction means and which has been identified according to the error correction information;
• decoding means for decoding the coded digital image data subjected to said concealing process by said conceal means;
• modification means for modifying contents of the concealment data reproduced by said reproducing means according to the error correction information;
• and
• output means for outputting the coded digital image data subjected to said concealing process by said conceal means and the concealment data whose contents has modified by said modification means to a peripheral device.