Communication Systems - Engineering

Q1:

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

A the input to the modulator is essentially constant

B the modulator is going through slope overload

C the accumulator is in saturation

D the speech signal is being sampled at the Nyquist rate

ANS:A - the input to the modulator is essentially constant

In delta modulator, when consecutive pulses of polarity are opposite then signal is constant.