| 摘要 |
PURPOSE:To fetch an AGC voltage by demodulating a scramble signal generated by a method for compressing a synchronizing signal part of a video carrier wave (or video intermediate frequency) by a receiving terminal, and thereafter, descrambling its signal. CONSTITUTION:The device is provided with a DC shifting circuit 2, amplifiers 3, 4 and 5 corresponding to the kind of a scramble (scramble mode), and a mode switching circuit 6, and by fetching an AGC voltage by descrambling a synchronizing signal, a stable AGC voltage is obtained.
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