DEMODULATION

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The process of separating the original information or SIGNAL from the MODULATED CARRIER. In the case of AMPLITUDE or FREQUENCY MODULATION it involves a device, called a demodulator or detector, which produces a signal corresponding to the instantaneous changes in amplitude or frequency, respectively. This signal corresponds to the original modulating signal.

In radio TRANSMISSION this process is a major function of a RECEIVER, in order to retrieve the desired signal.

See: HETERODYNE, RADIO SPECTRUM.

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