8.7 Application Example: Compact Disc
Compact Disc™ was introduced in 1980 to provide a mass storage medium for digital audio. It has become widely used for general-purpose data storage. Compact Discs use optical storage—the data is read off the disc using a laser. The design of the CD system is a triumph of signal processing over mechanics—CD players perform a great deal of signal processing to compensate for the limitations of a cheap, inaccurate player mechanism. The DVD× and Blu-Ray™ provide higher-density optical storage. However, the basic principles governing their operation are the same as those for CD. In this section we will concentrate on the CD as an example of optical disc technology.
As shown in Figure 8.38, data is stored in pits ...
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