Analog/digital system for television services

Details Analog/digital system for television services Analog/digital system for television services

1996-12-20

1999-07-06

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

380 9, 380 15, 380 19, 380 20, 380 23, 380 25, 380 49, 348 6, 348 10, 348 11, 348 12, 455 31, 455 32, 455 41, 455 42, 455 51, 455 61, 455 62, 455 63, H04N 7167, H04L 900

Patent

active

059206268

ABSTRACT:
A combined IRD scrambler/modulator is provided in a headend. A service provider transmits a digital program signal in a digital data stream to a headend which distributes analog program signal to at least one subscriber. The headend receives an encoded digital program signal in the digital data stream from the service provider and decrypts the digital program signal therefrom. The digital program signal includes an audio and a video portion. The video portion of the signal is scrambled by a scrambler. The digital audio portion of the digital program signal and scrambled video portion of the digital program signal are converted to an analog program signal and transmitted to one or more subscribers.

REFERENCES:
patent: 5073930 (1991-12-01), Green et al.
patent: 5642151 (1997-06-01), Nusbickel et al.
patent: 5787335 (1998-07-01), Novak

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