Television signal scrambling method and apparatus

Details Television signal scrambling method and apparatus Television signal scrambling method and apparatus

1991-04-30

1993-04-27

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 11, 380 15, H04N 7167

Patent

active

052069079

ABSTRACT:
A video signal from a video-audio source is converted to a digital signal, and stored in a memory. A read clock or a write clock for the memory is temporarily suspended to elongate or shorten a corresponding part of the digital signal. The elongated/shortened digital signal is converted to an analog video signal; and finally sync/blanking signal portions are compressed by a predetermined amount. The elongating operation may be continued and a one horizontal period part of the digital signal may be deleted when an accumulated elongation time has reached or exceeded one horizontal period.

REFERENCES:
patent: 4901349 (1990-02-01), Metzger et al.
patent: 5034981 (1991-07-01), Leonard et al.
patent: 5058157 (1991-10-01), Ryan
"Universal Descrambler", Radio Electronics, May 1990, pp. 37-43.

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