Mod`u*la"tion(?), n. [L. modulatio: cf. F. modulation.] 1. The act of modulating, or the state of being modulated; as, the modulation of the voice.
2. Sound modulated; melody.
(Mus.) A change of key, whether transient, or until the music becomes established in the new key; a shifting of the tonality of a piece, so that the harmonies all center upon a new keynote or tonic; the art of transition out of the original key into one nearly related, and so on, it may be, by successive changes, into a key quite remote. There are also sudden and unprepared modulations.
(Electronics) The alteration of hte amplitude, intensity, frequency, or phase (of the carrier wave of a radio signal) at intervals, so as to represent information to be transmitted.
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Sat 15th December 2018