Scrambling and descrambling system in CATV broadcasting system

Details Scrambling and descrambling system in CATV broadcasting system Scrambling and descrambling system in CATV broadcasting system

1979-09-11

1982-01-26

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358121, H04N 716

Patent

active

043131336

ABSTRACT:
Scrambling of the television signal in a CATV broadcasting system is effected by modulating the audio signal with a pilot signal, and modulating both the audio and video with a scrambling signal of a different frequency from the pilot signal. Descrambling is accomplished by detecting the pilot and scramble signals and using each in different ways to control demodulation so as to remove the scramble component from the audio and video signals.

REFERENCES:
patent: 3729576 (1973-04-01), Court
patent: 4024575 (1977-05-01), Harney et al.
patent: 4064536 (1977-12-01), Saeki et al.
patent: 4145716 (1979-03-01), Uemura et al.

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