Modulation type

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

  1. rajmak88

    Thread Starter New Member

    Sep 18, 2010
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    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
    2,147
    300
    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.
     
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