1
Ralph P Harney, Stanley E Guif: Catv sine wave coding system. Oak, Kinzer Plyer Dorn & McEachran, May 17, 1977: US04024575 (122 worldwide citation)

A means for decoding a generally constant frequency sine wave scrambled television signal uses an automatic gain control circuit in a closed loop. The scrambling, applied at the head end of the television system, applies a greater scrambling level to the audio carrier than it does to the video carri ...


2
Stanley E Guif, Terry L Nimmer, Donald A Weigt, Glenn Wolenec, Richard C Gall: Subscription TV decoder logic system. Oak, Kinzer Plyer Dorn & McEachran, September 5, 1978: US04112464 (105 worldwide citation)

A subscription TV decoder for processing encoded audio and video signals utilizes decoder enabling signals which are transmitted as audio subcarriers and have data and address portions thereof. The decoder includes audio and video decoder circuits and a decoder enabling circuit. The enabling circuit ...


3
Stanley E Guif, Terry L Nimmer, Donald A Weigt, Glenn Wolenec, Richard C Gall: Subscription TV audio carrier recovery system. Oak, Kinzer Plyer Dorn & McEachran, March 20, 1979: US04145717 (100 worldwide citation)

A subscription TV decoder for processing encoded audio and video signals in which the TV program audio information is received as an audio subcarrier includes means for decoding the video signal, a filter for separating the decoded video and audio signals, and a filter for separating the audio signa ...