Frequency Modulation

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Related to Frequency Modulation: phase modulation, amplitude modulation

frequency modulation

[′frē·kwən·sē ‚mäj·ə‚lā·shən]

(communications)

Modulation in which the instantaneous frequency of the modulated wave differs from the carrier frequency by an amount proportional to the instantaneous value of the modulating wave. Abbreviated FM.

Frequency Modulation

(communications)

(FM) A method of encoding data by varying the frequency of a constant amplitude carrier signal.

Contrast Amplitude Modulation.

This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Frequency Modulation

a method of modulating oscillations, in which the frequency of the high-frequency carrier oscillations is varied over time according to a law that corresponds to the signal being transmitted. A feature of frequency modulation is its high immunity to noise. Frequency modulation is used for high-quality transmission of information: in radio broadcasting (in the very-high-frequency band), for the audio signal of television programs, in voice-frequency telegraphy, in radiotelephone communications, and in other fields.

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References in periodicals archive ?

At intermediate pressures, extensive frequency modulation was produced in proportion to pressure.

Is the frequency content of the calls in North American treefrogs limited by their larynges?

The frequency modulation law obtained by solving through numerical methods of the equations [T.sub.gT](f) = t, is depicted in Fig.

Sidelobes reduction using synthesis of some NLFM laws

On the contrary, instantaneous spatial frequency estimates suffer from the abrupt spatial transitions in the test image: Estimates of vertical frequency modulation, even though flattened, are wrong, whereas horizontal ones are correct outside the space between horizontal parts of letter C (see the profiles in column E).

Single-band amplitude demodulation of Muller-Lyer illusion images

Frequency modulation of a 4.43-MHz subcarrier transmits the picture information.

Validation of a Forensic method for analog VHS video recorder identification

The EL6119C incorporates two separate high frequency modulation (HFM) oscillators for up to 500 MHz and 100 mA, peak to peak, per output.

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It's designated "FM." Not quite "frequency modulation," although one could argue that by placing the vehicle's V6 engine so that its center of gravity is located just behind the front axle there's not only a 52:48 front/rear weight distribution, but that there's improvement in handling, stability, and ride quality.

The G35: Infiniti enters the fray. (On Cars)

The composers of spectral music have been influenced by several electronic processes besides additive synthesis: filtering, ring modulation, and frequency modulation among others.

Introduction to the pitch organization of French spectral music

But in fact, the halftone screening methods used in any process reduce the tonal range, detail reproduction and color palette available to a printer and consequently the degree of fidelity to a photographic original.With advances in photographic, electronic and print reproduction technologies as well as innovative software engineering, frequency modulation screening techniques or stochastic screening has emerged as a method that can equal direct engraving gravure printing.

Quebecor Printing Vancouver: repositioned for strength

Frequency modulation, a new method of radio transmission and reception, was developed by Edwin H.

1939: Business and industry; science; education; philosophy and religion

Traditional broadcast radio modulation schemes like FM (frequency modulation) or AM (amplitude modulation) are used because signals are picked up by many receivers.

Looking at free-space technology

(6.30 mm) cartridge, 10,000 ftpi (394 ftpmm), modified frequency modulation (mfm).

Accredited standards committee X3, Information Processing Systems announces new projects to develop American National Standards