回复: APE刻为CD后,和原版CD相差有多大?
原帖由 sun_ce 于 2007-11-14 16:08:00 发表 我无法认同你的看法,而且也是第一听说还要记录每个坑的深浅度,如果这样,那么光盘里面的信息不单只记录每个转换后的1,0,而且还要记录每次压制的坑的深浅,激光不单读取0,1的数据,还要起到测距的作用?测量每个...... |
您理解错了,是凹坑的长度不是深浅!您没有仔细看那个图吗?
[转]CD data is stored as a series of tiny indentations (pits), encoded in a tightly packed spiral track moulded into the top of the polycarbonate layer. The areas between pits are known as 'lands'. Each pit is approximately 100 nm deep by 500 nm wide, and varies from 850 nm to 3.5 μm in length. The spacing between the tracks, the pitch, is 1.6 μm.
翻译:
CD数据是用一连串微小的凹坑(pit)记录的,这些数据被编码以后紧密地排列成一种螺旋形的轨道(track),然后用模具压制在聚碳酸酯的表面上。pit之间的地方被称为“lands”。每一个pit大约有100nm深、500nm宽,长度介于850nm到3.5μm之间。tracks之间的间距-pitch-为1.6μm。