H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/26
H04N 7/16 (2006.01) H04N 7/167 (2006.01) H04N 7/171 (2006.01)
Patent
CA 1195764
METHOD AND APPARATUS FOR IDENTIFYING AND RENDERING OPERATIVE PARTICULAR DESCRAMBLERS IN A TELEVISION SIGNAL SCRAMBLING SYSTEM ABSTRACT OF THE DISCLOSURE An in-band television signal scrambling method and apparatus are disclosed which employ a scrambler which receives and scrambles a television signal and one or more descramblers for restoring the scrambled television signal to an unscrambled con- dition. A tier level encoding scheme is used to identify and render operative predetermined descramblers. The scrambler en- codes tier level coding information in the form of whiter-than- white pulses on a scrambled television signal, these pulses being detected by the descramblers, with only those descramblers ident- ifed by the tier level coding information being rendered operative to unscramble the scrambled television signal. The descramblers preferably employ a plug-in module into which the tier level coding information assigned to a particular scrambler can be pro- grammed. The scrambling operation may be accomplished by sup- pressing the amplitude of the horizontal synchronizing signals in a television signal, and generating timing pulses in the form of other whiter-than-white pulses in the scrambled television signal which cue the descramblers enabling them to reconstruct the sup- pressed amplitude horizontal synchronizing signals.
405109
Barany David A.
Marland Dale W.
Eagle Comtronics Inc.
Kirby Eades Gale Baker
LandOfFree
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