Catv sine wave coding system

专利名称：Catv sine wave coding system发明人：Ralph P. Harney,Stanley E. Guif申请号：US05/573046申请日：19750430公开号：US04024575A公开日：19770517

摘要：A means for decoding a generally constant frequency sine wave scrambledtelevision 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 tothe audio carrier than it does to the video carrier. The unscrambling signal, the detectedaudio carrier scrambling signal, is combined with the scrambled signal in an amplifiercircuit, the output of which is a basic television signal. There is a residual of the scramblingsine wave remaining in the audio carrier output after unscrambling, but little or noresidual scrambling remaining on the video carrier. The residual audio carrier scramblingsignal is detected and amplified for application as the unscrambling signal.

申请人：OAK INDUSTRIES INC.

代理机构：Kinzer, Plyer, Dorn & McEachran

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