| 摘要 |
PURPOSE:To obtain an ACC detector free from less and over density with respect to noises by utilizing a peak detector and a synchronous detector for an ACC detector and by controlling and ACC amplifier by means of added outputs. CONSTITUTION:A burst input 8 from an ACC amplifier 1 and an oscillation output 75 from a subcarrier oscillator are added to a frequency detecting-type ACC detector 70 for synchronization-detecting a burst, and an output 78 whose burst period is sample-held is outputted. A burst signal 8 is envelope-detected and added to an envelope detecting-type ACC detector 71 for holding a peak value, and a peak hold value 77 is outputted. Outputs of said detector 70 and 71 are added in resistances 72 and 73, and their outputs are added to a DC voltage amplifier 74, where a level is shifted and amplified. Then a gain control of the ACC amplifier 1 is executed.
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