Home > Term: frequency modulation
frequency modulation
Changing the frequency of a carrier wave by some means so that the resultant waveform transmits a signal conveying information. For example, if the carrier wave with angular frequency ω is cos(ωt), the corresponding frequency-modulated signal is
where a is a constant and. Frequency modulation is used in some continuous-wave radars to permit range determination, but it is not generally used in weather radars. Compare amplitude modulation.
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