초록 ▼

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 c

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.

대표청구항 ▼

In a broadcasting system for broadcasting character information in packets having data signal portions of predetermined length, an error correction method for correcting errors included in the broadcasted character information, comprising the steps of: selecting a random multi-error correcting code

In a broadcasting system for broadcasting character information in packets having data signal portions of predetermined length, an error correction method for correcting errors included in the broadcasted character information, comprising the steps of: selecting a random multi-error correcting code having a block length that is at least as great as the length of the data signal portion of a packet, and shortening the block length if necessary to fit in the data signal portion of the packet; forming character code signals from said character information; alloting said character code signals sequentially into a plurality of packets, each packet including an allotted character code signal and parity bits determined in accordance with said multi-error correcting code; broadcasting said allotted character code signals and respective parity bits in the data signal portions in the sequence of said packets; receiving the broadcast data signal; multiplying the received data signal portions by a matrix having a predetermined column all consisting of ones to reproduce the character code signal; and decoding the character information from the reproduced character code signal.