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一、行、场扫描原理简述 1.行振荡电路:完全在TB1231集成块内完成,振荡频率由集成块内行启动电路和4.43MHz的色副载波频率决定的,(39)脚输入的视频信号在块内同步分离电路分离出同步信号:一路送到AFC1电路;另一路送到场同步分离电路。行AFC1另一路输入信号是经分频后的行振荡信号,在AFC1行脉冲信号与行同步信号共同输往误差信号和4.43 MHz频率分频后,共同输往行振荡控制电路。行频信号经分频后送到AFC2,AFC2另一路信号来自行输出变压器行逆程脉冲信号,AFC2对行振荡频率进行相位调整,经AFC2调整控制后行激励脉冲经预放后由(32)脚输出。
A line, field scanning principle outlined 1. Line oscillation circuit: complete in the TB1231 integrated block, the oscillation frequency by the integrated circuit and the start of the circuit 4.43MHz color subcarrier frequency decision, (39) input video signal In the block synchronization separation circuit to separate the synchronization signal: all the way to AFC1 circuit; the other way to the field sync separation circuit. The other input signal of line AFC1 is the frequency-divided line oscillation signal. After the pulse signal of AFC1 and the line synchronization signal are commonly input to the error signal and frequency divided by 4.43 MHz, they are commonly transmitted to the line oscillation control circuit. The line frequency signal is sent to AFC2 after frequency division. The other signal of AFC2 outputs the inverse pulse signal from the line of transformer. AFC2 adjusts the phase of line oscillation frequency. After AFC2 adjusts the control pulse, Foot output.