Modulation type

Discussion in 'General Electronics Chat' started by rajmak88, Apr 30, 2011.

  1. rajmak88

    Thread Starter New Member

    Sep 18, 2010
    In case of PAM the amplitude of sampled signal varies in accordance with info. signal so it is a type of analog pulse modulation.
    But in case of PWM and PPM, since the PWM or the PPM sampled signal varies in width or the position, but still is a digital signal which is transmitted. Then why PWM and PPM are still called a type of ANALOG pulse moudulation????
  2. Adjuster

    Well-Known Member

    Dec 26, 2010
    The information signal is represented by timing variations, in a proportional manner. The timing variations are thus analogs of the original signal. There is no conversion of the information into a numerical form.

    The PWM or PPM signals have constant amplitude and could be transmitted by a logic gate, but this does not alter the situation.
    rajmak88 likes this.