Compact disk (cd)
Compact disk (cd) a plastic substrate embossed with a pattern of pits that encode audio signals in digital format. The disk is coated with a metallic layer (to enhance its reflectivity) and read in a drive (cd player) that employs a focused laser beam and monitors fluctuations of the reflected intensity in order to detect the pits.
Source: http://ee.sharif.edu/~lcsl/useful/Electrical%20Engineering%20Dictionary.pdf
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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