Audio recovery from scrambled video in a cable compatible televi

Details Audio recovery from scrambled video in a cable compatible televi Audio recovery from scrambled video in a cable compatible televi

1995-02-08

1996-09-03

Cain, David C.

Cryptography

Key management

Having particular key generator

348500, H04N 7167

Patent

active

055531423

ABSTRACT:
A cable ready television receiver includes a set back decoder that communicates with the microprocessor in the television receiver via its own microprocessor. A synchronous demodulator in the television receiver is operated normally for unscrambled television signals and is operated to quadrature demodulate scrambled television signals. The quadrature demodulation develops only high frequency video, modulated chroma, FM modulated audio and DC. The demodulator output is applied to the audio circuit and to the AGC circuit in the television receiver. A descrambler in the decoder develops the video signal for application to the video circuitry in the television receiver.

REFERENCES:
patent: 4636853 (1987-01-01), Forbes et al.
patent: 4654705 (1987-03-01), Forbes et al.
patent: 4939780 (1990-07-01), Ohtsubo
patent: 5091936 (1992-02-01), Katznelson et al.
patent: 5278907 (1994-01-01), Snyder et al.

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