Scrambling and descrambling of television signals for subscripti

Details Scrambling and descrambling of television signals for subscripti Scrambling and descrambling of television signals for subscripti

1982-03-15

1984-09-11

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358117, 358122, 358123, H04N 716, H04K 104

Patent

active

044713800

ABSTRACT:
Subscription TV premium programming may be encoded with tagging information as by transmitting a tagging pulse during at least one horizontal line interval of each picture field in addition to pulses which are used to time the restoration of horizontal sync in the descrambler of a sync suppressed scrambling system. The additional tagging pulses provide information necessary to enable or disable the descrambler, and thereby provide high level encoding with minimum hardware complexity.

REFERENCES:
patent: 2862048 (1958-11-01), Roschke
patent: 2889399 (1959-06-01), Hammond, Jr.
patent: 3184537 (1965-05-01), Court et al.
patent: 3530232 (1970-09-01), Reiter et al.
patent: 3777053 (1973-12-01), Wittig et al.
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patent: 4068264 (1978-01-01), Pires
patent: 4091417 (1978-05-01), Nieson
patent: 4095258 (1978-06-01), Sperber
patent: 4115807 (1978-09-01), Pires
patent: 4338628 (1982-07-01), Payne et al.

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