Subscription television decoder

Details Subscription television decoder Subscription television decoder

1981-07-06

1983-10-04

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358122, H04N 716

Patent

active

044082258

ABSTRACT:
A decoder is responsive to a decode authorization signal for unscrambling a broadcast RF television signal having randomly suppressed horizontal blanking and synchronization pulses. The decoder comprises a tuner having a gated automatic gain control circuit and a video detector responsive thereto for developing a baseband video signal corresponding to the broadcast television signal. The decoder further comprises a sync restoration circuit developing a standard horizontal synchronization pulse in response to each suppressed horizontal blanking pulse of the baseband video signal, the standard horizontal synchronization pulses being continuously combined with the baseband video signal for operating the automatic gain control circuit and being coupled for unscrambling the baseband video signal only in response to the decode authorization signal.

REFERENCES:
patent: 4081831 (1978-03-01), Tang et al.
patent: 4095258 (1978-06-01), Sperber
patent: 4222068 (1980-09-01), Thompson
RCA Linear Integrated Circuits Application Note ICAN-6802.

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