Phase modulation

Phase modulation (PM) is a form of modulation which represents information as variations in the instantaneous phase of a carrier wave.

Related Topics:
Modulation - Phase - Carrier wave

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Unlike its more popular counterpart, frequency modulation (FM), PM is not very widely used (except perhaps for in the inappropiately named FM-synthesis for musical instruments, introduced by Yamaha around 1982.) This is because it tends to require more complex receiving hardware and there can be ambiguity problems with determining whether, for example, the signal has 0° phase or 180° phase.

Related Topics:
Frequency modulation - °

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