G - Physics – 06 – F
Patent
G - Physics
06
F
354/223.1
G06F 11/10 (2006.01) G11B 20/18 (2006.01)
Patent
CA 1169154
S01447 S81P112 ABSTRACT OF THE DISCLOSURE A method of receiving and decoding doubly-encoded, interleaved data occurring in blocks of information words and first and second check words to correct errors occurring due to transmission, includes adding error pointers to indicate uncor- rectable errors, and thereafter checking the number of pointers in each block and protecting against miscorrection of errors. The data are decoded in a first decoder and the information words and first check words are corrected by syndromes using the second check words. A pointer is added to any words containing uncorrectable error. Then the words so decoded are deinterleaved and decoded in a second decoder, where the infor- mation words are corrected by syndromes using the first check words. Here the pointers show the position of any erroneous words to facilitate error correction. The number of erroneous words in each block, at the second decoder, is determined by counting the associated pointers. If the number is less than a predetermined value, the pointers are cleared, but if it is greater than that value, the data are regarded as unreliable, and the pointers remain. Alternatively, all words in the block are given error pointers. Also, for a given number of erroneous words in each block as determined by syndromes, if the number of pointers is less than a predetermined amount, the entire block is regarded as unreliable and all words are given a pointer. Finally, uncorrected erroneous words are compensated by interpolation. -1-
379894
Odaka Kentaro
Sako Yoichiro
Gowling Lafleur Henderson Llp
Sony Corporation
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