Method and apparatus for encoding low redundancy check words fro

Details Method and apparatus for encoding low redundancy check words fro Method and apparatus for encoding low redundancy check words fro

1980-10-23

1983-02-22

Atkinson, Charles E.

Excavating

371 50, 371 51, G06F 1110

Patent

active

043751008

ABSTRACT:
Source data is organized by a time compression memory (4) into a plurality of successive groups of data words arranged in a pattern of rows and columns with the rows corresponding to respective recording tracks. A plurality of successive groups of parity check words is provided in the same pattern of rows and columns as the data words subsequent to the data word groups. Each parity check word is derived in a parity generator (6) by modulo-2 summations from the data words selected from different data word groups. The data and check words of each row of each respective group are (a) preceded by a synchronization code provided by a sync generator (10) to allow differentiation between data and parity groups, and (b) followed by a cyclic redundancy check, (CRC) code provided by a CRCC generator (9) to allow detection of an error in that data row or check words. The parity check word is used to correct an error specified by the CRC code upon detection of an error.

REFERENCES:
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patent: 3913068 (1975-10-01), Patel
patent: 4052698 (1977-10-01), Ragle
patent: 4201976 (1980-05-01), Patel
patent: 4205324 (1980-05-01), Patel
patent: 4206440 (1980-06-01), Doi et al.
patent: 4211997 (1980-07-01), Rudnick et al.
patent: 4238852 (1980-12-01), Iga et al.

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