Phase Modulation
Phase modulation (PM) is a form of modulation that represents information as variations in the instantaneous phase of a carrier wave.We can say that modification in phase according to low frequency will give phase modulation.
Unlike its more popular counterpart, frequency modulation (FM), PM is not very widely used for radio transmissions. This is because it tends to require more complex receiving hardware and there can be ambiguity problems in determining whether, for example, the signal has changed phase by +180° or -180°. PM is used, however, in digital music synthesizers such as the Casio CZ synthesizers, or to implement FM Synthesis in digital synthesizers such as the Yamaha DX7. (see FM Synthesis)
Read more about Phase Modulation: Theory, Modulation Index
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