Method and apparatus for scrambling a television signal

Details Method and apparatus for scrambling a television signal Method and apparatus for scrambling a television signal

H - Electricity

04

N

350/26

H04N 7/16 (2006.01) H04N 7/171 (2006.01)

Patent

CA 1195765

METHOD AND APPARATUS FOR SCRAMBLING A TELEVISION SIGNAL 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 by suppressing the amplitude of the horizontal synchronizing signals contained therein to a point below the "black" level and which generates whiter-than-white timing pulses in the scrambled television signal for use by a descrambler in reconstructing the suppressed amplitude horizontal synchronizing signals, and one or more descramblers for detecting the whiter-than-white timing pulses in the scrambled television signal and generating therefrom switching signals for a switchable attenuator through which the scrambled television signal passes. The attenuator boosts the amplitude of the suppressed amplitude horizontal synchronizing signals relative to the remainder of the scrambled television signal, thereby restoring the scrambled tele- vision signal to an unscrambled condition.

405129

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