==History== An ancient use of pulse-position modulation was the Greek hydraulic semaphore system invented by Aeneas Stymphalus around 350 B.C. that used the water clock principle to time signals. In this system, the draining of water acts as the timing device, and torches are used to signal the pulses. The system used identical water-filled contai...
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http://en.wikipedia.org/wiki/Pulse-position_modulation
(from the article `telemetry`) ...include two pulse-based methods in which several pulses are spaced out in time, each pulse representing one information channel. The two types are ...
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http://www.britannica.com/eb/a-z/p/132
pulse time modulation in which the positions in time of the pulses vary from their initial position in accordance with a given function of the value of the modulating signal
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=702-06-56
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