SOURCE UNITS
Sound is carried by various media. It's the job of a source unit to extract the sound from its storage carrier and convert it into electrical impulses. Source units are the most numerous among audio components; most systems include more than one.
Compact Disc Players, Fig. 29.2, use a laser to extract sound that has been digitally encoded on a disc. Besides the standard 4¾ inch music CD, there are 3 inch minidiscs (dubbed CD-3s) and 4¾, 8 and 12 inch CDV-s that add still or motion video to the audio track. Some CD players (dubbed combiplayers) handle all disc types, including laser video; others are dedicated to sound reproduction only. Changer models house several CDs in a tray or magazine and can be programmed to play discs or ...
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