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用普通彩电接收录像机或影碟机重放的NTSC制节目时,通常是伴音正常,但图像上下跳动。造成这种现象的原因是NTSC制信号的场频为60Hz,而PAL制信号为50Hz。若想让普通彩电能收看NTSC制节目,除彩色制式需改为NTSC制外,场频也要改为60Hz。 三洋83P机芯解码电路采用的是μPC1423CA。这是一种PAL/NTSC双制式电路,国内整机厂生产电视机时一般均未开发μPC1423CA的NTSC制功能。其实,只要增加一个开关和两个电阻,即可实现μPC1423CA的双制式工作。改制
When you receive an NTSC program that is played back from a VCR or DVD player using an ordinary color TV, it is normal to sound but the picture beats up and down. The reason for this phenomenon is that the NTSC signal has a field frequency of 60 Hz and the PAL signal has a frequency of 50 Hz. If you want ordinary TV can watch NTSC programs, in addition to the color system to be changed to NTSC system, the field frequency should be changed to 60Hz. Sanyo 83P movement decoding circuit is used μPC1423CA. This is a PAL / NTSC dual system circuit, the domestic factory production of television sets are generally not developed μPC1423CA NTSC system functions. In fact, as long as adding a switch and two resistors, you can achieve dual-mode μPC1423CA work. Restructuring