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In electronics, a technique for impressing information (voice, music, picture, or data) on a radio-frequency carrier wave by varying one or more characteristics of the wave in accordance with the signal. There are various forms of modulation, each designed to alter a particular characteristic of the carrier wave. The most commonly altered characteristics include amplitude (seeAM), frequency (seeFM), phase, pulse sequence, and pulse duration.
This entry comes from Encyclopædia Britannica Concise. For the full entry on modulation, visit Britannica.com.