Science Source December 28, 2009 DVD
EN_00957730_0470
Compact discs. Assortment of compact discs (CD's). Each disc stores audio data such as 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.
2011-03-20
EAST NEWS
Science Source
John Raffo
6g6025
1,68MB
25cm x 33cm przy 300dpi
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