How a CD works
Compact disc (CD) players have increasingly replaced the phonograph and the cassette tape. They offer a clear, crisp sound, faint background noise, and have the additional advantage of longer life. In addition to their audio content, some compact discs contain digital graphics that can be displayed on a television screen.
To understand how a CD works one must understand what a CD consists of. A CD is about 1.2 millimeters thick. Most of the CD consists of an injection-molded piece of clear polycarbonate plastic. During manufacturing, a high precision laser beam is used to burn microscopic pits arranged as a very long spiral track of data in the thin layer of a disk. Once the clear piec
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