Frequency demodulator for television receiver with time...

Details Frequency demodulator for television receiver with time... Frequency demodulator for television receiver with time...

H - Electricity

04

N

363/10, 329/11,

H04N 5/455 (2006.01) H04N 7/045 (2006.01) H04N 11/08 (2006.01)

Patent

CA 1278857

ABSTRACT Frequency demodulator for television receiver with time multiplexing A receiver is provided for a television system which uses time division multiplexing (TDM) of analog image signals and of bursts of duobinary coded digital data signals. The digital data signals are transmitted during the line and frame blanking intervals and grouped together in packets, comprising the sound and synchro- nisation signals, the spectral width required by the analog part being greater than that required by the digital part. The receiver comprises a single frequency demodulator for the analog and digital signals, adaptive as a function of the signal-to-noise ratio after demo- dulation at a width less than the optimum width for the analog part when the latter has a high signal-to-noise ratio.

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