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GATE ECE 2004 | Question-28

In the output of a DM speech encoder, the consecutive pulses are of opposite polarity during time interval $t_{1} < t < t_{2}.$ 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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