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Phase modulation

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Phase modulation (PM) is the encoding of information into a carrier wave by variation of its phase in accordance with an input signal.

Note that phase modulation can be regarded as a special case of frequency modulation where the carrier frequency modulation is the time derivative of the PM modulating signal.

Phase modulation can also be regarded as a special case of quadrature amplitude modulation.

Phase-shift keying refers to the simple case of phase modulation by a simple signal with only two states, such as in morse code or radioteletype applications.