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CBSE Class 12-science Answered

Which type of modulation is used for the waves which are not continuous but are in the form of pulses?
Asked by Topperlearning User | 08 Jul, 2014, 01:27: PM
answered-by-expert Expert Answer

If the carrier wave is not  continuous but in the form of pulses, the common pulse modulation systems are:

(i) Pulse Amplitude Modulation (PAM) in which amplitude of the pulses of the carrier pulse train varies in accordance with the modulating signal.

(ii) Pulse Duration Modulation (PDM) or Pulse Width Modulation (PWM) in which the pulse duration or the width of the pulses of carrier pulse train is varied in accordance with the modulating signal.

(iii) Pulse Position Modulation (PPM), the position of the pulses of the carrier wave train is varied in accordance with the instantaneous value of modulating signal.

Answered by | 08 Jul, 2014, 03:27: PM

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