Communication Systems
In Pulse Code Modulation system

Quantising noise can be overcome by companding
Quantising noise can be reduced by decreasing the number of standard levels
Suffers from the disadvantage of its incompatibly with TDM
Large bandwidth is required

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Communication Systems
DVD uses

Laser beam for both recording and playback
Video head for recording and laser beam for playback
Laser beam for recording and video head for playback
None of these

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