Two compact discs

Two compact discs

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Credit: MIKE AGLIOLO/SCIENCE PHOTO LIBRARY

Caption: Compact discs. Abstract image showing two compact discs (CD's) in multiple exposure. Each disc stores audio data such as music, as a series of fine depressions on the disc surface, representing a digitised musical signal capable of being read by a laser. To reflect the laser light, the coded music layer is coated with a fine film of metal which follows the depressions exactly. This layer is covered by another layer of transparent plastic which prevents dust and scratches from affecting the superior sound quality.

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Keywords: audio sound, cd, communication, communications, compact disc, technology

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