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本文所述电视制式转换设备能将NTSC制式(每秒60场、525行)的信号,转换成PAL制(每秒50场、625行)的信号,同时对双画面图像进行分离,输出两路不同的PAL制彩色全电视信号。设备采用高速A/D、RAM、D/A等组件,通过对数字信号的运算及控制,经过场补、行内插电路,使信号有较高的保真度,时钟电路有较好的稳定性,可用作接收国际直播卫星电视图像的制式转换和图像分离设备。
The television system conversion device described in the article can convert signals of NTSC system (60 fields and 525 lines per second) into signals of PAL system (50 fields and 625 lines per second), separate two-picture images and output two channels Different PAL system color full TV signal. Equipment using high-speed A / D, RAM, D / A and other components, through the digital signal computing and control, after field complement, line interpolation circuit, the signal has a higher fidelity, the clock circuit has better stability , Which can be used as a format conversion and image separation device for receiving international direct broadcast satellite television images.