Teletext magazine code detector

Details Teletext magazine code detector Teletext magazine code detector

H - Electricity

04

N

350/34

H04N 7/08 (2006.01) H04N 7/025 (2006.01)

Patent

CA 1231170

ABSTRACT The decoder may be used for decoding teletext signals broadcast in TV signals but may be used also for teletext-like signals, e.g. videotex signals. In the teletext decoder, a magazine code detector (33) detects a sought after magazine number in an error-encoded teletext signal. A memory (64) stores all allowable magazine code numbers in error-encoded form. A keyboard (28) or remote control enters into a microprocessor (29), in encoded form, the sought after magazine number. The microprocessor (29) addresses the memory location where the corresponding error-encoded magazine number is stored to develop at the output (66) of the memory (64) those encoded bytes of data that represent the sought after magazine number. The error-encoded encoded bytes are compared in a comparator (150) with the error-encoded bytes of incoming data in the teletext signal to determine the presence of the sought after magazine number in the teletext transmission. Preferably a logic network (39) detects the presence of the sought after number even in the presence of a one bit error.

465097

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