Dual loop sinewave descrambler and method of descrambling

Details Dual loop sinewave descrambler and method of descrambling Dual loop sinewave descrambler and method of descrambling

1989-02-01

1990-04-24

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 10, H04N 7167

Patent

active

049205668

ABSTRACT:
A method and apparatus are provided for descrambling a sinewave scrambled television signal. The television signal is applied to a dual loop circuit that detects AM sinewave modulation on the television signal sound carrier. The detected modulation is applied to the picture carrier of the television signal in a first loop of the circuit to cancel the AM sinewave modulation therefrom. The detected modulation is applied to the sound carrier of the television signal in a second loop of the circuit to increase the AM sinewave modulation on the sound carrier within the loop. The net loop gain of the first loop is then lowered to minimize the application of noise from the sound carrier to the picture carrier.

REFERENCES:
patent: 4024575 (1977-05-01), Harney et al.
patent: 4112464 (1978-09-01), Guif et al.
patent: 4148064 (1979-04-01), Reed
patent: 4571615 (1986-02-01), Robbins et al.
patent: 4598318 (1986-07-01), Robbins

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