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Discussion :: Communication Systems

  1. 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

    2. A.
    192 kHz
    B.
    2 MHz
    C.
    1.299 MHz
    D.
    1.54 MHz

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    Answer : Option D

    Explanation :

    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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