Pulse-amplitude modulation is a form of signal modulation where the message information is encoded in the amplitude of a series of signal pulses. Pulse-amplitude modulation is now rarely used, having been largely superseded by pulse-code modulation, and, more recently, by pulse-position modulation.
... population and its agricultural base. Along the coast of the Atlantic Ocean are also found several mountain ranges, amongst which the highest peak is the Pico d ...