Communication Systems
The disadvantage of FM over AM is that

Large bandwidth is required
High modulating power is needed
Noise is very high for high frequency
High output power is needed

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Communication Systems
In Pulse Code Modulation system

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

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