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Definition of "Modulator" |
The process of varying some characteristic of one wave (carrier wave) in accordance with some characteristic of another wave. / A device that imposes a signal on a carrier. A device that produces modulation; that is, a device that varies the amplitude, frequency, or phase of an ac signal. A circuit used in servo-systems to convert a dc signal to an ac signal. The output ac signal is a sine wave at the frequency of the ac reference voltage. The amplitude of the output is directly related to the amplitude of the dc input. The circuits function is opposite to that of a DEMODULATOR. In radar, it produces a high-voltage pulse that turns the transmitter on and off. Also see the separate section on Definitions relating to Radar. / device that varies the amplitude or phase of an electromagnetic wave. |
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