Digital signal recording device, digital signal playback device, and digital signal decoding device therefor
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsSadayuki Inoue, Junko Shinohara, Tatsuo Yamasaki, Ken Onishi
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Abstract
To reduce the undetected errors without degradation of the burst error correction capability, in error correction decoding of the digital signal with three-dimensional error correction codes appended thereto. For correcting errors by applying error correction codes in three directions of a recording direction, perpendicular direction, and direction of tracks, whether a burst error has occurred is checked, and an error-correction decoding algorithm is switched between one used when a burst error has occurred, and one used when no burst error has occurred.
Claims21
A digital signal playback device for playback from a magnetic tape on which record data is recorded, after arranging in two dimensions, consisting of a recording direction and perpendicular direction, the record data to be recorded in predetermined areas on tracks formed helically on magnetic tape, collecting a plurality of record data each arranged in the two dimensions to structure a data block, appending a third error correction code in a third direction including a direction of depth of the data block, and appending first and second error correction codes in the recording direction and perpendicular direction to the record data containing the third error correction code, said digital signal playback device comprising:
- first error-correction decoding means for performing error correction on the playback data using the first error correction code;
- burst error detecting means for detecting a burst error that has occurred in a playback signal during playback;
- second error-correction decoding means for performing error correction on the playback data using the second error correction code;
- and
- third error-correction decoding means for performing error correction on the playback data using the third error correction code;
- wherein when a burst error is detected by the burst error detecting means, an error-correction decoding algorithm followed by at least one of the second and third error-correction decoding means is made different from the one followed thereby when no burst error is detected.
An error-correction decoding device for performing error-correction using first to third error correction codes on received or reproduced digital data, having been transmitted or recorded, after arranging transmission or recording digital data in two dimensions, consisting of a transmitting or recording direction, and perpendicular direction, collecting a plurality of digital data each arranged in the two dimensions to structure a data block, applying the third error correction code in a third direction including a direction of depth of the data block, applying the first and second error correction codes in the transmitting or recording direction, and perpendicular direction to the digital data containing the third error correction code, and then transmitting or recording the digital data, said device comprising:
- burst error detecting means for detecting a burst error that has occurred in the received or reproduced digital data;
- first error-correcting means for performing error correction on the received or reproduced digital data using the first error correction code;
- second error-correcting means for of performing error correction on the received or reproduced digital data using the second error correction code;
- third error-correcting means for performing error correction on the received or reproduced digital data using the third error correction code;
- and
- control means for controlling such that, when a bust error is detected, at least one of the second and third error correction means uses an error correction decoding algorithm different from the one used when no burst error is detected.
A digital signal recording device in which intra-frame or -field coded or inter-frame or -field coded digital video and audio signals input in the form of transport packets are transparent-recorded, comprising:
- data separating means for separating the intra-frame or -field coded digital video signal from the transport packets;
- special playback data generating means for reconfiguring the intra-frame or -field coded digital video signal having been separated at the data separating means, to generate special playback data;
- and
- recording data generating means for re-configuring the data of the transport packets having been input, to generate sync block formats;
- wherein
- the area for recording the special playback data and error correction code is provided on a scanning trace of a head scanning the recording media at a predefined fast playback speed,
- one of the error correction code appended to the special playback data or the error correction code appended at least the data output from the recording data generating means is recorded in the area for recording the error correction code, and
- an identification signal identifying the error correction code recorded in the error correction code recording area is appended to the recording signal, and recorded.
Dependencies are inferred from the claim text.