Science Source January 20, 2009 DVD
EN_00957889_1526
Compact disc. An audio compact disc (CD). An audio CD stores music as a series of fine depressions, representing a digitized musical signal capable of being read by a laser. To reflect the laser light, the 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 sound quality.
2011-03-21
EAST NEWS
Science Source
Dale E. Boyer
p4683
3,9MB
28cm x 34cm przy 300dpi
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