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frequency modulation
(redirected from Frequency-modulated)

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frequency modulation

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In FM radio transmission, the frequency of the carrier wave is modulated, rather than its amplitude (as in AM broadcasts). The FM system is not affected by the many types of interference which change the amplitude of the carrier wave, and so provides better quality reception than AM broadcasts.

Variation of the frequency of a carrier wave in accordance with the signal to be transmitted. In FM the frequency of the carrier wave varies in accordance with the signal being transmitted. Its advantage over AM (amplitude modulation) is its better signal-to-noise ratio. It was invented by the US engineer Edwin Armstrong.



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? Mentioned in ? References in periodicals archive
 
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