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本文简要说明了ＰＡＬ识别器、消色检波器的工作原理和识别、消色信号产生的方法．通过对消色识别检波器的输出讨论，指出可用计算机来判别供给（Ｒ－Ｙ）、（Ｂ－Ｙ）同步解调器的基准副载波的相位是否正确．
This article briefly describes the PAL reader, achromatic detector working principle and identification, achromatic signal generation method. By discussing the output of the Achromatic Detector, it is pointed out that a computer can be used to determine whether the phase of the reference subcarrier supplied to the (R-Y), (B-Y) synchronous demodulator is correct.