ＣＤ生产线，把经过了各种纠错、检错用的编码后的数字声音信号，压刻在ＣＤ盘上，在ＣＤ盘上，是把相当于“０１”数字信号，转成了相应的凸凹信号。而这两个凸凹面的高度差刚好是ＣＤ唱机所使用的激光波长的１／４，这样当入射光射到凹面时，反射光与入射光刚好相差１／... CD production line, after a variety of error correction, error detection with the encoded digital audio signal pressure on the CD disc, the CD disc, is the equivalent of “01” digital signal into the corresponding convex and concave signal. The height difference between the two convex and concave surfaces is exactly 1/4 of the wavelength of the laser used by the CD player, so that when the incident light is incident on the concave surface, the difference between the reflected light and the incident light is exactly 1 /