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为了使NTSC制彩色电视机能够接收我国电视台发送的PAL制彩色图象信息,除了必须对NTSC制机的高频头、中放级和伴音级幅频特性进行改制外,还必需使原来的NTSC制机的解码电路具有对R-Y色差信号进行逐行倒相(简称PAL)的功能.对于各种类型的NTSC制机来说,必须根据其解码电路的具体情况,选择PAL-D制(采用梳状滤波器的标准解码方式)或PAL-S制(简单PAL解码方式)来进行改
In order to make NTSC color TV set to receive PAL color image information sent by our TV station, in addition to the NTSC system must be high-frequency head, the release level and sound level amplitude-frequency characteristics of the system, it is also necessary to make the original NTSC The decoding circuit of the machine has the function of performing phase inversion (hereinafter referred to as PAL) on the RY color difference signal, and for each type of NTSC system, the PAL-D system must be selected according to the specific conditions of the decoding circuit Filter-like standard decoding method) or PAL-S system (simple PAL decoding method) to change