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Wat (wie) is Modified Frequency Modulation - definitie
Modified frequency modulation
ENCODING IN COMMUNICATION TECHNOLOGY
Delay encoding; Miller code; Miller encoding; MMFM; Miller coding; Modified Modified Frequency Modulation; M2FM; M²FM; Miller sub-carrier coding; Miller subcarrier coding; Miller encoded subcarrier; Miller encoded sub-carrier; Miller sub-carrier code; Miller subcarrier code; Delay coding; MFM (encoding); FM (encoding); Digital FM; Delay code; Modified modified frequency modulation; MMFM (encoding); FM line code; Modified modified FM; Modified squared FM; Modified squared frequency modulation; Intel MMFM; Intel M²FM; Intel M2FM; ISBC MMFM; ISBC M²FM; ISBC M2FM; ISIS MMFM; ISIS M²FM; ISIS M2FM; Intel Modified Modified Frequency Modulation; Intel Modified modified frequency modulation; Miller Code; Modified Frequency Modulation; MFM encoding; Data separator
Modified frequency modulation (MFM) is a run-length limited (RLL) line code used to encode data on most floppy disks and some hard disk drives. It was first introduced on hard disks in 1970 with the IBM 3330 and then in floppy disk drives beginning with the IBM 53FD in 1976.
Modified Frequency Modulation
ENCODING IN COMMUNICATION TECHNOLOGY
Delay encoding; Miller code; Miller encoding; MMFM; Miller coding; Modified Modified Frequency Modulation; M2FM; M²FM; Miller sub-carrier coding; Miller subcarrier coding; Miller encoded subcarrier; Miller encoded sub-carrier; Miller sub-carrier code; Miller subcarrier code; Delay coding; MFM (encoding); FM (encoding); Digital FM; Delay code; Modified modified frequency modulation; MMFM (encoding); FM line code; Modified modified FM; Modified squared FM; Modified squared frequency modulation; Intel MMFM; Intel M²FM; Intel M2FM; ISBC MMFM; ISBC M²FM; ISBC M2FM; ISIS MMFM; ISIS M²FM; ISIS M2FM; Intel Modified Modified Frequency Modulation; Intel Modified modified frequency modulation; Miller Code; Modified Frequency Modulation; MFM encoding; Data separator
<storage> (MFM, Modified FM, or sometimes "Multiple
Frequency Modulation") A modification to the original
frequency modulation scheme for encoding data on {magnetic
disks}. MFM allows more than 1 symbol per flux transition (up
to 3), giving greater density of data. It is used with a data
rate of between 250-500 kbit/s on industry standard 3.5" and
5.25" low and high density diskettes, and up to 5 Mbit/s on
ST-506 hard disks. Except for 1.44 MB floppy disks, this
encoding is obsolete.
Other data encoding schemes include GCR, FM, RLL. See
also: PRML.
(2002-06-24)
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.
