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(1)TA8783初始状态,制式识别和启动过程由于在彩色信号进入解码块TA8783N之前,即IC处于初始状态时,TA8783(15)脚(3.58/4.43识别信号输出端)输出为低电平,因此,在初始状态,不论输入的色度信号是3.58 MHz还是4.43 MHz,开始都经4.43 MHz低通滤波后进入(21)脚(PAL/NTSC输入)。进入(21)脚的4.43 MHz的色度信号,一路经ACC放大后输出至PAL识别电路(P-ID);另一路再经色调调整电路
(1) TA8783 initial state, standard recognition and start-up process Since the TA8783 (15) pin (3.58 / 4.43 identification signal output terminal) outputs a low level before the color signal enters the decoding block TA8783N, that is, , Initially (4.12 MHz) low pass filtered into (21) feet (PAL / NTSC input) regardless of whether the input chrominance signal is 3.58 MHz or 4.43 MHz. 4.43 MHz into the chrominance signal of (21) feet, all the way to the PAL identification circuit (P-ID) amplified by the ACC amplification; the other way through the tone adjustment circuit