Protected television signal distribution system

Details Protected television signal distribution system Protected television signal distribution system

H - Electricity

04

N

350/26

H04N 7/167 (2006.01) H04N 7/171 (2006.01)

Patent

CA 1193708

PROTECTED TELEVISION SIGNAL DISTRIBUTION SYSTEM ABSTRACT OF THE DISCLOSURE 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 ampli- tude modulation is recovered to permit level of service authori- zation 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 vary subscriber service authorizations - as to permit pay-per-view billing.

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