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  1. A speech signal, band limited to 4kHz and peak voltage varying between + 5V and - 5V is sampled at the Nyquist rate. Each sample is quantized and represented by 8 bits. If the bits 0 and 1 are transmitted using bipolar pulses, the minimum bandwidth required for distortion free transmission is

    2. A.
    64 kHz
    B.
    32 kHz
    C.
    8 kHz
    D.
    4 kHz

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    Answer : Option D

    Explanation :

    According to Nyquist Criteria, minimum sampling frequency = 2 x 4 k = 8 kHz

    But each cycle can accommodate two bits

    Thus minimum frequency = 4 kHz.

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