frequency modulation

n. Abbr. FM

The encoding of a carrier wave by variation of its frequency in accordance with an input signal.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

frequency modulation

(Telecommunications) a method of transmitting information using a radio-frequency carrier wave. The frequency of the carrier wave is varied in accordance with the amplitude and polarity of the input signal, the amplitude of the carrier remaining unchanged. Abbreviation: FM Compare amplitude modulation

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

FM

1. frequency modulation: a method of impressing a signal on a radio carrier wave by varying the frequency of the carrier wave.

2. a system of radio broadcasting by means of frequency modulation.

Compare AM.

Fm

Chem. Symbol. fermium.

fm.

1. fathom.

2. from.

frequency modulation

A method of radio broadcasting in which the frequency of the wave that carries the sound signal changes to reflect the various sounds that are to be reproduced, while the amplitude of the wave remains the same. Frequency modulation reduces static in radio transmission. Compare amplitude modulation.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun

frequency modulation - modulation of the frequency of the (radio) carrier wave

modulation - (electronics) the transmission of a signal by using it to vary a carrier wave; changing the carrier's amplitude or frequency or phase

Translations

modulation de fréquence

frequency modulation

n → modulazione f di frequenza

Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995

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References in periodicals archive

The set and reset signals for the self-triggering frequency modulation are obtained from the feedback-loop amplifier and sensing circuit.

High Performance BCD Integrated Buck-Boost Converter in an AMOLED Display with Application of Self-Triggering Frequency Modulation

The higher flame sensitivity to the lower frequency modulation could be the result of the higher amplitude equivalence ratio oscillations.

Effect of Modulation of the Inlet Velocity and Equivalence Ratio Gradients on the Stabilization of Stratified Axisymmetric Bluff-Body Flames

The frequency modulation index ([m.sub.f]) is as follows

Phase disposition PWM based Reduced Switch Reverse Voltage multi level inverter

The proposed AM-FM radar module combines amplitude modulation (AM) and frequency modulation (FM) based radars with an active reflector.

High-Accuracy AM-FM Radar with an Active Reflector

[25] presented the thought of stage wise matching pursuit and then proposed the line frequency modulation wavelet path tracking method.

Enhanced Orthogonal Matching Pursuit Algorithm and Its Application in Mechanical Equipment Fault Diagnosis

In addition, integrated connectivity capabilities support FM (frequency modulation) radio, and location-based services with GNSS (global navigation satellite system) solutions.

EXYNOS 7 DUAL 7270 INTEGRATES LTE MODEM IN ONE CHIP

Samsung also notes that the Exynos 7570 has entered mass production, and is the first Exynos processor to fully integrate Cat.4 LTE 2CA modem and connectivity solutions such as Wi-Fi, Bluetooth, Frequency Modulation (FM) and Global Navigation Satellite System (GNSS) in one chip.

Samsung unveils 14nm quad-core Exynos 7570 SoC aimed at budget phones and IoT devices

In 2013, however, it halted operation due to high fuel costs, lack of spare parts and was turn into a frequency modulation (FM) broadcasting radio reaching a 5-kilometer radius.

Thieves storm Wau radio station, vandalise equipment

With the linear frequency modulation pulse technology and matched filtering the digital signal processing technology is applied to a large number of the advanced technologies such as, the side scan sonar system to obtain a longer distance of the sweeping survey, at the same time also has a higher resolution, make the side scan sonar performance produced the qualitative leap (Aliabadi, 2014; Borodina, 2012).

Research and analysis on the reverberation scattering characteristics for active sonar echo detection system

SGS Life Science Services has installed and validated instrumentation which uses frequency modulation spectroscopy (FMS) for headspace oxygen analysis of biopharmaceutical container closure systems, as well as imaged capillary isoelectric focusing (icIEF) for analysis of charge distribution and heterogeneity in biopharmaceuticals, at its facility in Mississauga, Canada.

SGS adds biopharma instrumentation

Over an individual pulse there occurs an oscillating frequency modulation with amplitude of 1 -2 kHz (Fig.

The little walking leaves from Iguazu National Park (NE Argentina)--comparisons between subtropical and tropical Typophyllum species (Orthoptera: Tettigoniidae: Pterochrozinae)

There is a linear frequency modulation of the signal that chirps the carrier frequency from 300 MHz at the start of the RF pulse envelope to 900 MHz at the end of the pulse envelope.

Scope FFT and waveform math functions take on RF measurements