Method and apparatus for preventing errors in PCM signal process

Details Method and apparatus for preventing errors in PCM signal process Method and apparatus for preventing errors in PCM signal process

1981-02-02

1983-04-12

Atkinson, Charles E.

Excavating

360 381, 371 2, 371 4, 371 38, G06F 1110

Patent

active

043800718

ABSTRACT:
A technique is disclosed for preventing errors in a PCM error-correction decoder of the type supplied with successive transmission blocks, each comprised of time-interleaved PCM, error-correction and error detection words, wherein the transmission blocks are selectively supplied from first and second data sources such that an error interval is produced as a function of the transition period during which the selection of the data sources is changed over from one to the other. According to this technique, the presence of an error in a supplied transmission block is detected, and each of the time-interleaved words included in that transmission block is identified as being erroneous. The transmission block is time de-interleaved to recover a de-interleaved block comprised of de-interleaved PCM and error-correction words. An erroneous PCM word in the de-interleaved block is corrected as a function of the remaining non-erroneous PCM and error-correction words in that de-interleaved block. However, the correction of a PCM word is inhibited if the block in which that word is disposed contains at least one word derived from the first data source and another word derived from the second data source.

REFERENCES:
patent: 4206440 (1980-06-01), Doi et al.
patent: 4211997 (1980-07-01), Rudnick et al.
patent: 4227221 (1980-10-01), Kanazawa
patent: 4238852 (1980-12-01), Iga et al.
patent: 4281355 (1981-07-01), Wada et al.
patent: 4282551 (1981-08-01), Kanazawa et al.
patent: 4306305 (1981-12-01), Doi et al.

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