Error correction method and apparatus

H - Electricity – 04 – N

Patent

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350/34

H04N 7/08 (2006.01)

Patent

CA 1222558

ABSTRACT OF THE DISCLOSURE A random multi-error correcting code having a maximum length block in a packet, for instance, a majority logic decodable (272, 190) shortened difference set cyclic code is used for the error correction in a character code broadcasting system. The error correcting ability of this code is increased. If errors cannot be corrected, the leading bit is shifted, so that more than 8-bit errors is to be corrected. Also, the correction is made by decreasing the threshold value, so that the error correcting ability is improved. Framing timing extraction circuit and a phase lock circuit for the framing timing are eliminated, so that a load of the hardware is reduced. Preferably, the error correcting code is superposed on the television signal during a vertical blanking period.

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