Method for the defeat of illegal descramblers sensitive to the e

Details Method for the defeat of illegal descramblers sensitive to the e Method for the defeat of illegal descramblers sensitive to the e

1997-07-28

2000-02-22

Laufer, Pinchus N.

Cryptography

Video cryptography

Video electric signal modification

380221, H04N 7167

Patent

active

060289414

ABSTRACT:
A method for defeating illegal receivers sensitive to the edges of synchronization signals in a scrambled video signal is provided. The scrambled video signal includes synchronization signals having levels which prevent a standard receiver from detecting the synchronization signals by using the levels of the synchronization signals. The synchronization signals also have one or more pulses with level transitions above or below a signal detection threshold level of the standard television receiver which prevent the illegal receivers from detecting the synchronization signals by using the edges of the synchronization signals.

REFERENCES:
patent: 3586768 (1971-06-01), Ganske
patent: 4338628 (1982-07-01), Payne et al.
patent: 4924498 (1990-05-01), Farmer et al.
"The Upcoming New World of TV Reception", Popular Electronics May 1979 pp. 49-62.

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