Modulation

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Modulation

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1. The variation in the value of some parameter characterizing a periodic oscillation. </dd>
2. Specifically, variation of some characteristic of a radio wave, called the carrier wave, in accordance with instantaneous values of another wave, called the modulating wave. </dd>
Variation of amplitude is amplitude modulation, variation of frequency is frequency modulation, and variation of phase is phase modulation. The formation of very short bursts of a carrier wave, separated by relatively long periods during which no carrier wave is transmitted, is pulse modulation. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use