Meaning of MODULATION in English
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 (see AM ), frequency (see FM ), phase , pulse sequence, and pulse duration.
Britannica Concise Encyclopedia. Краткая энциклопедия Британика. 2012