Error correcting device

Details Error correcting device Error correcting device

1980-03-31

1982-05-18

Smith, Jerry

Excavating

371 39, G06F 1110

Patent

active

043308600

ABSTRACT:
An error correcting device which is useful for digital data transmission, e.g.--in PCM (pulse coded modulation) type tape recorders. The positions of erroneous data are ascertained by an error detecting method such as the CRCC (cyclic redundancy check code) method. The error correction is performed using two kinds of check codes, P and Q. Check code P is obtained by a modulo 2 operation on each bit of a plurality of data. Check code Q is obtained by a modulo 2 operation on each bit of data which is successively shifted by adding extra bits having a predetermined polarity to the individual data units.
By means of above-rated error detection method and the two check codes, the present invention provides an error correcting device which is capable of correcting up to two erroneous data units. The error correcting circuit is constructed simply, and error correcting performance is increased.

REFERENCES:
patent: 3623155 (1971-11-01), Hsiao et al.
patent: 3958220 (1976-05-01), Marshall
patent: 4107652 (1978-08-01), Tanahashi et al.

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