Cryptography – Key management – Having particular key generator
Patent
1988-06-14
1990-05-15
Buczinski, Stephen C.
Cryptography
Key management
Having particular key generator
358148, 358150, H04N 504
Patent
active
049264770
ABSTRACT:
A descrambler for a scrambled channel having a suppressed horizontal synchronization pulse which scrambled channel is provided in a broadband cable television signal along with nonscrambled channels. A signal splitter receives the broadband CATV signal and provides first and second split outputs. A switch coupled to the second output of the signal splitter passes the horizontal synchronization pulse of the scrambled channel and blocks the video signal of the scrambled channel. The horizontal synchronization pulse passing through the switch is then phase adjusted to synchronize with the horizontal synchronization pulse of the scrambled channel provided at the first output of the signal splitter, and both horizontal synchronization pulses are summed in a combiner along with the video/audio signal provided at the first output of the signal splitter. Consequently, the full synchronization pulse is provided at the output of the combiner to descramble the scrambled channel. No band reject filter is required between the first output of the power splitter and the power combiner so that the nonscrambled channels are unaffected by the descrambler.
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Buczinski Stephen C.
Cain David
General Instrument Corporation
Lipsitz Barry R.
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