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Communication Systems

Q1:

24 telephone channels, each band limited to 3.4 kHz, are to be time division multiplexed by using PCM, calculate the bandwidth of PCM system for 128 quantization levels and an 8 KHz sampling frequency

A 192 kHz

B 2 MHz

C 1.299 MHz

D 1.54 MHz

ANS:D - 1.54 MHz

Given, n = 24, fm = 3.4 kHz M = 128, 2N = 128  n = 7 But fs = 2fm, here we will consider fs (sampling) frequency instead at 2fm  2 x 3.4 kHz  6.8 KHz. B.W. = [24(7 + 1)] 8 kHz = 1.54 MHz.



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