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Pulse Amplitude Modulation (PAM)
Pulse amplitude modulation is the simplest form of pulse modulation and is either transmitted by itself or, more commonly, is used to develop other pulse-modulated waveforms. In pulse-amplitude modulation, the signal is sampled at regular intervals to obtain a pulse whose amplitude is proportional to the amplitude of the signal at the instant of sampling. ...
This type of modulation is used as the first step in converting an analog signal to a discrete signal or in cases where it may be difficult to change the frequency or phase of the carrier. In this case the carrier is a pulse train rather than a sine wave and the spectrum of the carrier consists of several components at nwc = 2np/T where T is the time between pulses. ... The figure below shows three typical waveforms in which the pulse amplitude is varied by the amplitude of the modulating signal. ... View (C) shows Pulse-Amplitude Modulation (PAM) in which the amplitude of each pulse is controlled by the instantaneous amplitude of the modulating signal at the time of each pulse.
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