Modulation is the process of taking an audio signal, called the carrier, and applying a second signal, called the modulator, to affect a property of the carrier. The two main types of modulation are frequency modulation and amplitude modulation

Other applications are phase modulation and pulse width modulation

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.

[R.]

Thomson.

3. 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.

 

© Webster 1913.

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