Master decoder for television signal scramble systems

摘要: A master decoder for scrambled television signals in which the are processed a circuit by converting them to other frequencies and then removing scrambling signal. One method uses one or more narrow filters at fixed frequency with signal being heterodyned down of place rejection band filters. second eliminates video frequencies. In this method, phase carrier channel is regenerated filtering it crystal filter means an automatic comparison (APC) loop. The used synchronously demodulate third use comb using delay line produces periodic rejecting bands spaced selected equal reciprocal produced lines. lines horizontal produce frequency.