Protected television signal distribution system

Details Protected television signal distribution system Protected television signal distribution system

1980-12-10

1986-11-04

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358122, H04N 7167

Patent

active

046212850

ABSTRACT:
A television signal distribution system protects outgoing programs from unauthorized reception; and marks or tags the conveyed signals with a digital word identifying the class of viewers authorized to receive the program ("level of service"). Basic encription is accomplished by effectively suppressing the horizontal and vertical synchronizing information. Horizontal sync information, and the program-characterizing level of service word which is interleaved in time with prescribed horizontal sync pulses, is distributed via pulse amplitude modulation of the audio carrier.
At subscriber receiving stations, the sound carrier amplitude modulation is recovered to permit level of service authorization verification; and to reconstitute the video carrier to receivable form by an amplitude modulation which is the inverse of the sync-suppressing modulation of the head end.
In accordance with one feature of the present invention, a further data channel may be employed to very subscriber service authorizations--as to permit pay-per-view billing.

REFERENCES:
patent: 3184537 (1965-05-01), Court et al.
patent: 3530232 (1970-09-01), Reiter et al.
patent: 4068264 (1978-01-01), Pires
patent: 4095258 (1978-06-01), Sperber
patent: 4145717 (1979-03-01), Guif et al.
patent: 4163252 (1979-07-01), Mistry et al.

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