Information storage apparatus

Details Information storage apparatus Information storage apparatus

1987-12-22

1989-08-15

Smith, Jerry

Excavating

371 47, G06F 1110

Patent

active

048582352

ABSTRACT:
In an information storage apparatus having an error-correcting code, wherein digital information and check symbols are stored in groups of codewords which are divided into blocks of equal size and a synchronization field for data synchronization is added to each block, a detector detects errors in consecutive synchronization fields when the digital information is read, and a flag-setting circuit sets dropout flags when a signal from the detector indicates an error in consecutive synchronization fields. The flags are set from the last synchronization field that is correctly detected before the error up to the first synchronization field that is correctly detected after the error. In decoding the codewords, the errors in them are corrected with reference to the dropout flags.

REFERENCES:
patent: 4162480 (1979-07-01), Berlekamp
patent: 4525840 (1985-06-01), Heinz
patent: 4696008 (1987-09-01), Takei
patent: 4747105 (1988-05-01), Wilson
Nikkei Electronics No. 21.
Research Publication PRL 73-77 of the Institute of Electronics and Communication Engineers of Japan.
T. Inoue et al., "A New Class of Burst-Error-Correcting Codes and its Application to PCM Tape Recording Systems", 1987 National Telecommunications Conference, 20.6.1-20.6.5, 1978 IEEE.

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