当录像机或录音机仅作播放机使用时,其功能与LD、VCD或CD基本一样。对LD或VCD而言,其作用与录像机相当,主要是实现电影、电视节目的图像重放;而CD主要是实现音乐或语言节目的重放。那么为什么录像带或录音带越放图像和音质越差,但LD、VCD或CD却不会?我们可从这两类机器所使用的记录介质、记录方法和播放方式等几方面来分析原因所在。 When a VCR or recorder is used only as a player, its function is basically the same as that of LD, VCD, or CD. For LD or VCD, its role and VCR, mainly to achieve the movie, television program image playback; and CD is mainly to achieve music or language program playback. So why the video and audio tape are more fragile and the sound quality is worse, but LD, VCD or CD does not? We can analyze the reason from the recording media, recording methods and playback methods used by these two types of machines.