Compact discs. Photograph of several audio compact discs (CD). The CD stores music as a series of fine depressions,representing a digitised 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,normally aluminium,which follows the depressions exactly. The reflective surface is covered by a thick layer of transparent plastic which prevents dust scratches from affecting the sound quality. A standard audio CD can store about 80 minutes of music | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Lovegrove, Damien |
Bildgröße: | 3703 px × 4812 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |