Television scrambling and descrambling method, and transmitter a

Details Television scrambling and descrambling method, and transmitter a Television scrambling and descrambling method, and transmitter a

1994-09-14

1996-06-25

Cain, David C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 10, H04N 7167

Patent

active

055307566

ABSTRACT:
In a television transmission system comprising an analog video channel scrambled with a control word which is changed occasionally and a NICAM sound channel scrambled with a control word which is also changed occasionally, and different scrambling and modulation circuits having independent clocks for the sound and video signals, a single control word generator is used for the sound and video signals and when this control word is changed for the video signal (17), a bit or a specific group of bits is incorporated in the subsequent sound data packet (18) indicating that a new control word is available, but the new control word will only be used for a subsequent data packet (19).

REFERENCES:
patent: 4636854 (1987-01-01), Crowther et al.
patent: 4890321 (1989-12-01), Seth-Smith et al.
patent: 5243650 (1993-09-01), Roth et al.

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