Pay television

Details Pay television Pay television

1993-03-12

1993-12-21

Swann, Tod R.

Cryptography

Key management

Having particular key generator

380 21, 380 15, H04N 7167

Patent

active

052727513

ABSTRACT:
In a pay television device, a horizontal sync signal, a vertical sync signal, and the like are removed from a composite video signal, and first-frequency and second-frequency signals for descrambling processing are attached in the intervals corresponding to the removed signals, thus eliminating the need for multiplexing signals which are necessary for descrambling processing on an audio signal.

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patent: 5113441 (1992-05-01), Harada
patent: 5142575 (1992-08-01), Farmer et al.
patent: 5161187 (1992-11-01), Kajita et al.

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