Television scrambling system

Details Television scrambling system Television scrambling system

1996-04-09

1999-06-15

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

380 10, 380 17, H04N 7167

Patent

active

059129700

ABSTRACT:
A sync suppression, phase inversion scrambling system for a television signal is modified to improve its anti-piracy attributes SAW filters are switched during horizontal intervals to introduce scrambling The switching is a function of a mode signal and framing code signals of two different widths A false framing code signal is inserted during the vertical interval to switch the filters. Additional false framing code signals of sufficient width to embrace the vertical broad pulses in the television signal are supplied to impart amplitude changes to the vertical broad pulses Authorized decoders can recognize the false framing code signals as legitimate and follow the filter switching performed at the encoder (to restore the vertical broad pulses), whereas pirate decoders cannot The result is a total loss of vertical sync in television receivers connected to the pirate decoders

REFERENCES:
patent: 4706283 (1987-11-01), Citta et al.
patent: 4706284 (1987-11-01), Citta et al.
patent: 4885776 (1989-12-01), Citta et al.
patent: 4926477 (1990-05-01), Paik
patent: 5206908 (1993-04-01), Kikuchi et al.

Affiliated with

Also associated with

Rating

Television scrambling system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Television scrambling system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Television scrambling system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-407838