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In electronics, modulation is the process of varying one or more properties of a high-frequency periodic waveform, called the carrier signal?, with respect to a modulating signal. This is done in a similar fashion as a musician may modulate a tone (a periodic waveform) from a musical instrument by varying its volume, timing and pitch. The three key parameters of a periodic waveform are its amplitude ("volume"), its phase ("timing") and its frequency ("pitch"), all of which can be modified in accordance with a low frequency signal to obtain the modulated signal. Typically a high-frequency sinusoid? waveform is used as carrier signal?, but a square wave? pulse train? may also occur. (wikipedia)

See Also

Amplitude Modulation
Frequency Modulation

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