G - Physics – 06 – F
Patent
G - Physics
06
F
340/74
G06F 11/00 (2006.01) G11B 20/18 (2006.01) G11B 27/032 (2006.01)
Patent
CA 1152597
METHOD AND APPARATUS FOR P _V NTING ERRORS IN PCM SIGNAL PR~CESSING APPARATUS ABSTRACT OF THE DISCLOSURE 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-interleavec block comprised of de-interleaved PCM and error-correcti 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.
369129
Gowling Lafleur Henderson Llp
Sony Corporation
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