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frequency modulation

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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
 
The company's radio stations consist of 40 frequency modulation (FM) and 12 amplitude modulation (AM) stations located in Arizona, California, Colorado, Florida, Nevada, New Mexico and Texas.
Entravision Communications Corp. (EVC) by Los Angeles Business Journal
xG Technology owns and intends to commercially exploit the intellectual property rights to xG Flash Signal, an innovative Radio Frequency modulation and encoding technology.
Continuing Strong Demand in xMax Sees High Interest Levels in ... by Business Wire
The concept involves phase modulation of the interrogating microwave field, rather than the traditional frequency modulation used in most atomic clocks.
NIST develops phase-modulation servos for atomic clocks. (News Briefs) by Journal of Research of the National Institute of Standards and Technology
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