Pulse Position Modulation
The pusle position, relative to clock pulses, is proportional to the information signal.
A stream of pulses is needed.
The fixed width pulses are delayed (relative to a regular clock pulse) by an amount that is proportional to the level of the signal (in red) to be modulated.
The light grey arrows show the size of the delay.
The red blobs show the moment when the signal is sampled (measured).
The vertical gray/orange lines are the regularly spaced sample time intervals.
The blue pulses are delayed relative to these regularly spaced intervals.
The delay is proportional to the level of the signal being transmitted.
The sample level is shown by the orange arrows.
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