Error correction method and apparatus for data broadcasting syst

Details Error correction method and apparatus for data broadcasting syst Error correction method and apparatus for data broadcasting syst

1984-01-17

1986-12-16

Fleming, Michael R.

Excavating

371 42, G06F 1110

Patent

active

046302719

ABSTRACT:
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 error correction in a character code broadcasting system. The error correcting ability of this code is increased. The correction is made by decreasing a threshold value, so that the error correcting ability is improved. A framing timing extraction circuit and a phase lock circuit for the framing timing are eliminated, so that the amount of hardware needed is reduced. Preferably, the error correcting code is superposed on the television signal during the vertical blanking period.

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