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%ما هو (من)٪ 1 - تعريف
Frequency modulation
![An American FM radio transmitter in Buffalo, NY at [[WEDG]]](https://commons.wikimedia.org/wiki/Special:FilePath/FM Broadcast Transmitter High Power.jpg?width=200 "An American FM radio transmitter in Buffalo, NY at [[WEDG]]")
![static]], while the FM receiver clearly reproduced a music program from Armstrong's experimental FM transmitter [[W2XMN]] in New Jersey.](https://commons.wikimedia.org/wiki/Special:FilePath/GE FM radio antistatic demonstration 1940.jpg?width=200 "static]], while the FM receiver clearly reproduced a music program from Armstrong's experimental FM transmitter [[W2XMN]] in New Jersey.")
![Frequency spectrum and [[waterfall plot]] of a 146.52{{nbsp}}MHz carrier, frequency modulated by a 1,000{{nbsp}}Hz sinusoid. The modulation index has been adjusted to around 2.4, so the carrier frequency has small amplitude. Several strong sidebands are apparent; in principle an infinite number are produced in FM but the higher-order sidebands are of negligible magnitude.](https://commons.wikimedia.org/wiki/Special:FilePath/Waterfall FM.jpg?width=200 "Frequency spectrum and [[waterfall plot]] of a 146.52{{nbsp}}MHz carrier, frequency modulated by a 1,000{{nbsp}}Hz sinusoid. The modulation index has been adjusted to around 2.4, so the carrier frequency has small amplitude. Several strong sidebands are apparent; in principle an infinite number are produced in FM but the higher-order sidebands are of negligible magnitude.")
ENCODING OF INFORMATION IN A CARRIER WAVE BY VARYING THE INSTANTANEOUS FREQUENCY OF THE WAVE
Frequency modulated; Frequency Modulation; Frequency-modulated; Frequency-modulation; NFM; Frequency modulator; Wideband FM; F.m.; FM (modulation); Narrowband FM; Analog FM; Analog frequency modulation
Frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. The technology is used in telecommunications, radio broadcasting, signal processing, and computing.
Frequency Modulation
ENCODING OF INFORMATION IN A CARRIER WAVE BY VARYING THE INSTANTANEOUS FREQUENCY OF THE WAVE
Frequency modulated; Frequency Modulation; Frequency-modulated; Frequency-modulation; NFM; Frequency modulator; Wideband FM; F.m.; FM (modulation); Narrowband FM; Analog FM; Analog frequency modulation
<communications> (FM) A method of encoding data by varying the
frequency of a constant amplitude carrier signal.
Contrast Amplitude Modulation.
(2001-04-02)
frequency modulation
ENCODING OF INFORMATION IN A CARRIER WAVE BY VARYING THE INSTANTANEOUS FREQUENCY OF THE WAVE
Frequency modulated; Frequency Modulation; Frequency-modulated; Frequency-modulation; NFM; Frequency modulator; Wideband FM; F.m.; FM (modulation); Narrowband FM; Analog FM; Analog frequency modulation
¦ noun the modulation of a radio or other wave by variation of its frequency, especially to carry an audio signal.
