Multiple choice

In the output of a DM speech encoder, the consecutive pulses are of opposite polarities during time interval t1 $\le$ t $\le$ t2. This indicates that during this interval,

  1. the input to the modulator is essentially constant

  2. the modulator is going through slope overload

  3. the accumulator is in saturation

  4. the speech signal is being sampled at the Nyquist rate
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A Correct answer
Explanation

Consecutive pulses are of the same polarity when modulator is in slope overload. Consecutive pulses are of opposite polarities when the input is constant.

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