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LD或LVD(Laser Vision Disk,缩写为LVD)欲称镭射影碟,它是一种直径为30cm、厚2mm、双面记录着音频和视频信号的大光碟。而VCD(Video CompactDisc,缩写为VCD)是一种直径为12cm、厚1.2mm、单面记录着压缩音频和视频信号的小光盘。为什么直径为30cm的LD片和直径仅仅是12cm的VCD片都能播放卡拉OK和电影呢?其实,VCD和LD虽都能放电影和卡拉OK,但它们的记录与播放原理并不相同。LD的制作原理:首先通过转换,把声音信号和影像信号转换成电视信号,接着把模拟电视图像信号和
LD or LVD (Laser Vision Disk, abbreviated as LVD) is a laser disc, a large disc with a diameter of 30 cm and a thickness of 2 mm, on both sides of which audio and video signals are recorded. VCD (Video Compact Disc, abbreviated as VCD) is a compact disc with a diameter of 12 cm and a thickness of 1.2 mm, which records compressed audio and video signals on one side. Why the diameter of 30cm LD and only 12cm in diameter VCD can play karaoke OK and movies? In fact, although VCD and LD can play movies and karaoke OK, but their recording and playing principle is not the same. LD production principle: First, through conversion, the voice signal and video signal into a television signal, and then the analog TV image signal and