Modulation

n. action of modulating; variation; variation of carrier wave (Electronics); change from one key to another (Music)

For the musical use of "modulation" as a change of key, see modulation (music). In telecommunications, modulation is the process of varying a periodic waveform, i.e. a tone, in order to use that signal to convey a message, in a similar fashion as a musician may modulate the tone from a musical instrument by varying its volume, timing and pitch. Normally a high-frequency sinusoid waveform is used as carrier signal. The three key parameters of a sine wave are its amplitude ("volume"), its phase ("timing") and its frequency ("pitch"), all of which can be modified in accordance with a low frequency information signal to obtain the modulated signal.
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Noun
1. a musical passage moving from one key to another
(synonym) transition
(hypernym) passage, musical passage
(derivation) modulate
2. (electronics) the transmission of a signal by using it to vary a carrier wave; changing the carrier's amplitude or frequency or phase
(hypernym) transmission
(hyponym) amplitude modulation, AM
(derivation) modulate
(classification) electronics
3. rise and fall of the voice pitch
(synonym) intonation, pitch contour
(hypernym) prosody, inflection
(hyponym) intonation pattern
(derivation) tone, inflect, modulate
4. a manner of speaking in which the loudness or pitch or tone of the voice is modified
(synonym) inflection
(hypernym) manner of speaking, speech, delivery
(derivation) tone, inflect, modulate
5. the act of modifying or adjusting according to due measure and proportion (as with regard to artistic effect)
(hypernym) revision, alteration
(derivation) regulate, modulate

n. modulation; variation of carrier wave (Electronics); change from one key to another (Music)

n. modulation, variation; variation of carrier wave (Electronics); change from one key to another (Music)