Frequency Modulation - определение. Что такое Frequency Modulation
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  3. Frequency Modulation

Что (кто) такое Frequency Modulation - определение

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Frequency modulation         
  • alt=Animation of audio, AM and FM signals
  • An American FM radio transmitter in Buffalo, NY at [[WEDG]]
  • FM modulation
  • 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.
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.
https://en.wikipedia.org/wiki/Frequency_modulation
Frequency Modulation         
  • alt=Animation of audio, AM and FM signals
  • An American FM radio transmitter in Buffalo, NY at [[WEDG]]
  • FM modulation
  • 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.
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         
  • alt=Animation of audio, AM and FM signals
  • An American FM radio transmitter in Buffalo, NY at [[WEDG]]
  • FM modulation
  • 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.
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.
Pulse-frequency modulation         
REPRESENTS AN ANALOG SIGNAL USING ONLY TWO LEVELS
Pulse Frequency Modulation
Pulse-frequency modulation (PFM) is a modulation method for representing an analog signal using only two levels (1 and 0). It is analogous to pulse-width modulation (PWM), in which the magnitude of an analog signal is encoded in the duty cycle of a square wave.
https://en.wikipedia.org/wiki/Pulse-frequency_modulation
Modified frequency modulation         
  • A byte encoded using FM (above) and MFM (below). Dashed blue line denotes clock pulse (the signal level change in it is ignored), and dashed red line, data pulse (signal level change encodes 1, and absence thereof, 0).
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.
https://en.wikipedia.org/wiki/Modified_frequency_modulation
Modified Frequency Modulation         
  • A byte encoded using FM (above) and MFM (below). Dashed blue line denotes clock pulse (the signal level change in it is ignored), and dashed red line, data pulse (signal level change encodes 1, and absence thereof, 0).
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)
Modulation         
  • A low-frequency message signal (top) may be carried by an AM or FM radio wave.
  • Categorization for signal modulation based on data and carrier types
  • [[Waterfall plot]] of a 146.52&nbsp;MHz radio carrier, with amplitude modulation by a 1,000&nbsp;Hz sinusoid. Two strong sidebands at + and - 1&nbsp;kHz from the carrier frequency are shown.
  • A 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.
PROCESS OF ENCODING INFORMATION BY VARYING PROPERTIES OF A PERIODIC CARRIER WAVEFORM
Modulator; Modulated; Mode of transmission; Pulse modulation; Shift keying; Digital modulation; Pulse Modulation; Modulation (communications); Demod; Periodic current reversal; Pulse modulator; Multi Carrier Modulation; Analog modulation; Modulating signal; Modulation memory; Analog modulation method; Digital modulation method; Digital Modem; Modulated wave; Pulse modulation methods; Pulse time modulation; Automatic digital modulation recognition; Digital carrier modulation; Analog carrier modulation
In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a separate signal called the modulation signal that typically contains information to be transmitted. For example, the modulation signal might be an audio signal representing sound from a microphone, a video signal representing moving images from a video camera, or a digital signal representing a sequence of binary digits, a bitstream from a computer.
https://en.wikipedia.org/wiki/Modulation
Modulated         
  • A low-frequency message signal (top) may be carried by an AM or FM radio wave.
  • Categorization for signal modulation based on data and carrier types
  • [[Waterfall plot]] of a 146.52&nbsp;MHz radio carrier, with amplitude modulation by a 1,000&nbsp;Hz sinusoid. Two strong sidebands at + and - 1&nbsp;kHz from the carrier frequency are shown.
  • A 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.
PROCESS OF ENCODING INFORMATION BY VARYING PROPERTIES OF A PERIODIC CARRIER WAVEFORM
Modulator; Modulated; Mode of transmission; Pulse modulation; Shift keying; Digital modulation; Pulse Modulation; Modulation (communications); Demod; Periodic current reversal; Pulse modulator; Multi Carrier Modulation; Analog modulation; Modulating signal; Modulation memory; Analog modulation method; Digital modulation method; Digital Modem; Modulated wave; Pulse modulation methods; Pulse time modulation; Automatic digital modulation recognition; Digital carrier modulation; Analog carrier modulation
·Impf & ·p.p. of Modulate.
Modulator         
  • A low-frequency message signal (top) may be carried by an AM or FM radio wave.
  • Categorization for signal modulation based on data and carrier types
  • [[Waterfall plot]] of a 146.52&nbsp;MHz radio carrier, with amplitude modulation by a 1,000&nbsp;Hz sinusoid. Two strong sidebands at + and - 1&nbsp;kHz from the carrier frequency are shown.
  • A 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.
PROCESS OF ENCODING INFORMATION BY VARYING PROPERTIES OF A PERIODIC CARRIER WAVEFORM
Modulator; Modulated; Mode of transmission; Pulse modulation; Shift keying; Digital modulation; Pulse Modulation; Modulation (communications); Demod; Periodic current reversal; Pulse modulator; Multi Carrier Modulation; Analog modulation; Modulating signal; Modulation memory; Analog modulation method; Digital modulation method; Digital Modem; Modulated wave; Pulse modulation methods; Pulse time modulation; Automatic digital modulation recognition; Digital carrier modulation; Analog carrier modulation
·noun One who, or that which, modulates.
modulation         
  • A low-frequency message signal (top) may be carried by an AM or FM radio wave.
  • Categorization for signal modulation based on data and carrier types
  • [[Waterfall plot]] of a 146.52&nbsp;MHz radio carrier, with amplitude modulation by a 1,000&nbsp;Hz sinusoid. Two strong sidebands at + and - 1&nbsp;kHz from the carrier frequency are shown.
  • A 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.
PROCESS OF ENCODING INFORMATION BY VARYING PROPERTIES OF A PERIODIC CARRIER WAVEFORM
Modulator; Modulated; Mode of transmission; Pulse modulation; Shift keying; Digital modulation; Pulse Modulation; Modulation (communications); Demod; Periodic current reversal; Pulse modulator; Multi Carrier Modulation; Analog modulation; Modulating signal; Modulation memory; Analog modulation method; Digital modulation method; Digital Modem; Modulated wave; Pulse modulation methods; Pulse time modulation; Automatic digital modulation recognition; Digital carrier modulation; Analog carrier modulation
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