Frequency Modulation

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Frequency Modulation </dt>
Angle modulation of a sine-wave carrier in which the instantaneous frequency of the modulated wave differs from the carrier frequency by an amount proportional to the instantaneous value of the modulating wave. Compare pulse modulation, amplitude modulation, phase modulation, intensity modulation. </dd>
''Combinations of phase and frequency modulation are commonly referred to as frequency modulation. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use