COMPUTER FUNDAMENTALS

Detailed explanation-1: -Optical devices The disc surface is divided into tracks, with each track containing many flat areas and hollows. The flat areas are known as lands and the hollows as pits. When the laser shines on the disc surface, lands reflect the light back, whereas pits scatter the laser beam.

Detailed explanation-2: -Audio tracks are defined in the Red Book specification for CD Digital Audio (which was the first CD specification). One song or movement usually comprises one audio track, containing audio in the form of raw PCM samples in 16 bit/44.1 kHz resolution in 2 channels, and a subcode multiplexed with the audio data.

Detailed explanation-3: -The music on a CD is imprinted in the form of pits of varying length on a spiral track 3.52 miles (5.66 kilometres) long. There are approximately 16, 000, 000, 000 pits 0.11 micro-metres deep. The largest pit dimension is 3.054 microns; the smallest is 0.833 microns.

Detailed explanation-4: -Pits are indentations in the surface of the disc that represent bits with a value of 0. Lands are flat areas on the surface of the disc that represent bits with a value of 1. These pits and lands can then be read by a photodetector that converts reflected light into electrical signals.