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Communication Systems - Engineering

Q1:

In PCM, if the number of quantization levels is increased from 4 to 64, then the bandwidth requirement will approximately be increased __________ times.

A 8

B 16

C 3

D 32

ANS:C - 3

Bandwidth for PCM system = 2nN fm Hz for N >> 1, n >> 1 where n is no. of channel, N is no. of bit. B1 = 2n N1 fm B2 = 2n N2 fm 2N1 = 4 N1 = log24 N1 = 2 2N2 = 64 N2 = log264 6 .