Question

What is Analog Pulse Modulation ?
Amber
Pulse-amplitude modulation (PAM), is a form of signal modulation where the message information is encoded in the amplitude of a series of signal pulses. It is an analog pulse modulation scheme in which the amplitudes of a train of carrier pulses are varied according to the sample value of the message signal.
Writeacher
When you copy and paste from somewhere else, you NEED to give the source.

http://en.wikipedia.org/wiki/Pulse-amplitude_modulation