Frequency Modulation

The information signal is used to vary the carrier signal frequency. The phase of the carrier varies with the integral of the modulating wave.

Signal-to-noise ratio may be increased over amplitude modulation without increasing power (though bandwidth will suffer).

Deviation Ratio

Ratio of the maximum frequency deviation to the maximum modulating frequency of a frequency modulation system, under specified conditions.

Modulation Index

In frequency modulation with a sinusoidal modulating wave, the ratio of the frequency deviation of the modulated wave to the frequency of the modulating function.

See also: Amplitude Modulation, Angle Modulation, Armstrong, Edwin Howard, Carrier, Carrier Frequency, Frequency Deviation, Frequency Shift Keying, Modulation, Varactor Modulator.

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Subjects: Electronics Physics