A voice signal is bandlimited by an anti-aliasing filter to 3.4 kHz before being (b) linearly quantised and converted into a PCM (Pulse Code Modulation) signal. () What is the function and effect of the anti-aliasing filter? (ii) What would be a suitable minimum sampling rate? (iii) What is the minimum PCM bit rate required to achieve a signal to quantisation noise ratio of greater than 55 dB? (iv) Assuming a raised cosine channel is used for transmission of the PCM signal, with a roll-off factor of 0.32, determine the required channel bandwidth.

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Sample and Hold circuit

The sampling circuit and the holding circuit generate electrical samples as input and then hold these samples for a specified period. The time at which the sample and circuit holder produces the input signal sample is called the sampling time. Correspondingly, the length of the circuit that holds the sampled value is called the holding time.