Victor Company of Japan, Limited

Kazumi Iwata

Atsushi Hayami

Kentaro Yokouchi

Shigeru Nemoto

Takaro Mori

With two consecutive product-coded ECC blocks, EBand EB, as a set, the rth row of first ECB block EBis followed by the rth row of second ECC block EBin such a way that the first row of first ECC block EBis followed by the first row of second ECB block EB, which is followed by the second row of first ECC block ECB, which is followed by the second row of second ECC block EB, and so on, to interleave data on a row basis. That is, data of two ECC blocks, EBand EB, is allocated alternately on a row basis. This allocation method allows an error to be distributed after reproduction even when a serious burst error extending 18 rows occurs in an ECC block.

Digital signal processing method, data recording and reproducing apparatus, and data recording medium that are resistant to burst errors

Errors in a first data signal of a first error correction code system in a reproduced signal are corrected to get first correction-resultant data. Errors in a second data signal of a second error correction code system in the reproduced signal are corrected to get second correction-resultant data. All address information pieces in the second correction-resultant data for every error correction block are subjected to error checks. When at least one of all the address information pieces is correct, a descramble initial value is set in response to the correct address information piece. When all the address information pieces are erroneous, a correct address information piece is estimated from an address information piece associated with a previous error correction block and the descramble initial value is set in response to the estimated correct address information piece. The first correction-resultant data are descrambled in response to the descramble initial value.

Information recording and reproducing apparatus

With two consecutive product-coded ECC blocks, EB and EB , as a set, the rth row of first ECB block EB is followed by the rth row of second ECC block EB in such a way that the first row of first ECC block EB is followed by the first row of second ECB block EB , which is followed by the second row of first ECC block ECB , which is followed by the second row of second ECC block EB , and so on, to interleave data on a row basis. That is, data of two ECC blocks, EB and EB , is allocated alternately on a row basis. This allocation method allows an error to be distributed after reproduction even when a serious burst error extending 18 rows occurs in an ECC block.

A variable transfer rate data reproduction system is provided which performs a reproduction operation and a reproduction inhibit operation cyclically to reproduce data recorded on a recording disc. A pickup traces a spiral track formed on the recording disc during the reproduction operation and is also controlled to continue to trace a following portion of the track over a plurality of track turns during the reproduction inhibit operation without a track jump. Upon resumption of the reproduction operation, the pickup jumps over the plurality of tracks to return back to a portion of the track where the reproduction operation has been Interrupted previously. This results in decreased mechanical stress acting on mechanical parts for moving the pickup.

Variable transfer rate data reproduction apparatus

A variable transfer rate data reproduction system is provided which performs a reproduction operation and a reproduction inhibit operation cyclically to reproduce data recorded on a recording disc. A pickup traces a spiral track formed on the recording disc during the reproduction operation and is also controlled to continue to trace a following portion of the track over a plurality of track turns during the reproduction inhibit operation without a track jump. Upon resumption of the reproduction operation, the pickup jumps over the plurality of tracks to return back to a portion of the track where the reproduction operation has been interrupted previously. This results in decreased mechanical stress acting on mechanical parts for moving the pickup.

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Kanagawa-ken, Japan

Kazumi Iwata