Error correction system in a teletext system

Details Error correction system in a teletext system Error correction system in a teletext system

H - Electricity

03

M

354/222, 350/34

H03M 13/00 (2006.01) G06F 11/10 (2006.01) H03M 13/43 (2006.01) H04N 7/035 (2006.01)

Patent

CA 1223076

ABSTRACT An improved error correction system for a difference set cyclic (272, 190) code with 190 data bits and 82 test bits in a packet which is transmitted on vertical blanking interval of a television signal. The system comprises a buffer memory for storing an original data which is subject to correction and corrected data, and an error correction circuit having at least a syndrome register, a majority circuit and a data register. The data transfer between the buffer memory and the error correction circuit is effected by wired logic hardware means without using software operation time of a programmed computer so that the computer operation time is not wasted upon error correction. A correction number counter is provided for counting the number of corrected bits for adjusting the threshold level for determining "1" or "0" level of a reception signal, adjusting the operation criteria of the majority circuit in the error correction circuit, and the stopping of the error correction operation in the case of too many errors.

477540

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