Sync suppression scrambling of television signals for...

Details Sync suppression scrambling of television signals for... Sync suppression scrambling of television signals for...

H - Electricity

04

N

350/26

H04N 7/167 (2006.01) H04N 7/171 (2006.01)

Patent

CA 1194213

SYNC SUPPRESSION SCRAMBLING OF TELEVISION SIGNALS FOR SUBSCRIPTION TV ABSTRACT In order to provide higher efficiency of secu- rity in sync suppression scrambling of subscription TV signals, the signals are encoded with a timing pulse having a selected time delay relationship with the sup- pressed horizontal sync intervals of the TV signals. The timing can be implemented digitally by selecting a plurality (e.g., 12) of different timings. The timing can also be dynamically varied. The TV signals are descrambled by restoring the sync pulses at only those receiving stations authorized to receive the premium subscription programming which have circuits for gener- ating restoring pulses with the selected time relation- ship upon reception of the timing signals. Accordingly, the use of unauthorized descramblers, which are insensi- tive to the timing signals or do not provide the restor- ing pulses in proper time relationship, is discouraged.

418378

Affiliated with

Also associated with

Rating

Sync suppression scrambling of television signals for... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sync suppression scrambling of television signals for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sync suppression scrambling of television signals for... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1299789