Variable cyclic redundancy character detector

Details Variable cyclic redundancy character detector Variable cyclic redundancy character detector

1976-07-02

1977-08-23

Atkinson, Charles E.

Communications: electrical

Digital comparator systems

360 26, G06K 504

Patent

active

040443299

ABSTRACT:
The invention disclosed reduces unrecoverable read errors from a magnetic tape resulting from the apparent lack of a cyclic check character (CCC), sometimes referred to as a cyclic redundancy check character, or a longitudinal check character (LCC), sometimes referred to as a longitudinal redundancy check character. The detector provides a variable read window to synchronize receipt of the CCC and/or LCC with their associated data blocks even though the CCC and/or LCC was not written in the appropriate time frame called for by the write specification of the tape in question.

REFERENCES:
patent: 3519988 (1970-07-01), Grossman
patent: 3670304 (1972-06-01), Andresen et al.
patent: 3708783 (1973-01-01), Hedin
patent: 3725861 (1973-04-01), Hancock
patent: 3774154 (1973-11-01), Devore et al.
patent: 3789400 (1974-01-01), Towns
patent: 3792436 (1974-02-01), De Voy et al.
patent: 3812531 (1974-05-01), Hall
patent: 3882459 (1975-05-01), Barlow et al.

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