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一、视频光盘及声象信息 视频光盘机是播放视频光盘(LD光盘)的声象设备。在LD光盘上录有图象和伴音两种信息。光盘的播放过程是将其声象信息取出并分别解调成视频图象信号和伴音音频信号的还原过程。 LD光盘上的声象信息是采用调频法记录的,它不同于采用数字处理技术的CD光盘。因此,图象信号的播放过程是一个信号解调(鉴频)的过程。
First, the video CD-ROM and audio and video information video CD player video disc (LD disc) sound image equipment. Recorded on the LD disc images and sound two kinds of information. Disc playback process is to remove its audio and video information and demodulated into a video image signal and audio and audio signal restoration process. The audio and video information on LD discs is recorded using the FM method, unlike CD discs that use digital processing technology. Therefore, the image signal playback process is a signal demodulation (frequency) process.