Method and apparatus for jamming selected television programs

Details Method and apparatus for jamming selected television programs Method and apparatus for jamming selected television programs

1988-09-30

1991-02-05

Wallace, Linda J.

Cryptography

Cryptanalysis

358 86, 455 1, H04N 7167

Patent

active

049912062

ABSTRACT:
In order to selectively jam M selected channels to selected subscribers in a CATV system, each of M different oscillating signals, each of which oscillating signals has a duration longer than the duration of the horizontal synchronization signal of the television channel it is to jam and a frequency higher than the carrier wave of the channel it is to jam, are in turn added to the television signal circuits of those subscribers who are not authorized to receive the particular channel being jammed by the jamming signal being added. The television set of the non-authorized subscriber picks up the higher frequency jamming signal as the valid horizontal synchronization signal and therefore ignores the valid horizontal synchronization signal, with the result that the channel in question is unviewable on the television set of the non-authorized subscriber.

REFERENCES:
patent: 4434436 (1984-02-01), Kleykamp et al.
patent: 4521809 (1985-06-01), Bingham et al.
patent: 4769838 (1988-09-01), Hasegawa
patent: 4792971 (1988-12-01), Uemura

Affiliated with

Also associated with

Rating

Method and apparatus for jamming selected television programs does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for jamming selected television programs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for jamming selected television programs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-17658