(3)CPU 必须引入电台识别信号(同步脉冲)。自动搜索选台时,CPU 通过引入的电台识别信号(同步脉冲)来判断电台信号的有无。CPU 只有收到从小信号处理电路来的足够幅度的同步脉冲信号时,才能判定有电视台(节目)信号,进而减慢调谐速度以便进行微调。(4)CPU 必须引入正确的 AFT 电压。CPU 通过电台识别同步信号判定有电台信号后,立即根据从主机中放电路 AFT— (3) The CPU must introduce a radio identification signal (sync pulse). When searching for a station automatically, the CPU judges whether there is a station signal or not by referring to the station identification signal (sync pulse). Only when the CPU receives a sufficient amplitude of sync pulse signals from a small signal processing circuit can it be determined that there is a station (program) signal, thereby slowing down the tuning speed for fine tuning. (4) The CPU must introduce the correct AFT voltage. CPU through the radio to identify the synchronization signal to determine the radio signal, immediately from the host in the discharge circuit AFT-