modulation factor

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modulation factor [‚mäj·ə′lā·shən ‚fak·tər]

(communications)

In general, the ratio of the peak variation in the modulation actually used in a transmitter to the maximum variation for which the transmitter was designed.

In an amplitude-modulated wave, the ratio (usually expressed in percent) of the peak variation of the envelope from its reference value, to the reference value. Also known as index of modulation.

In a frequency-modulated wave, the ratio of the actual frequency swing to the frequency swing required for 100% modulation.

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