Dictionary:Modulation

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1. The process by which some characteristic of one signal is varied in accordance with another signal. Examples are shown in Figure M-16. 2. A measure of the intensity of magnetization impressed on a direct recording magnetic tape, often expressed as a percentage of the amount which will produce a certain amount of harmonic distortion. 3. Sometimes used to imply the number of bits used to represent a maximum voltage in digital recording. See also doublet modulation.