Communication Systems
In Pulse Code Modulation system

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

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Communication Systems
DVD uses

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

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Communication Systems
Assertion (A): In FM the frequency of the carrier is varied by the modulating voltageReason (R): FM and PM are two forms of angle modulation.

Both A and R are correct but R is not correct explanation of A
Both A and R are correct and R is correct explanation of A
A is correct but R is wrong
A is wrong but R is correct

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