Modulation in which the instantaneous frequency of a sine wave carrier is caused to depart from the center frequency by an amount proportional to the instantaneous value of the modulating signal (188) Note 1: In FM, the carrier frequency is called the center frequency Note 2: FM is a form of angle modulation Note 3: In optical communications, even if the electrical baseband signal is used to frequency-modulate an electrical carrier (an "FM" optical communications system), it is still the intensity of the lightwave that is varied (modulated) by the electrical FM carrier In this case, the "information,"as far as the lightwave is concerned, is the electrical FM carrier The lightwave is varied in intensity at an instantaneous rate corresponding to the instantaneous frequency of the electrical FM carrier [After FAA]
A means of adding voice or data to a radio frequency transmission by varying the carrier frequency Broadcast stations in the 88-108 MHz "FM" band and television station sound channels use this modulation technique FM is relatively insensitive to the static sources that AM is prone to
A form of modulation in which the frequency of the modulated carrier wave is varied in proportion to the amplitude of the modulating wave In this case the phase of the carrier varies with the integral of the modulating wave See also modulation
(FM) A form of modulation in which the frequency of the carrier is varied in accordance with the instantaneous value of the modulating signal See also amplitude modulation (AM)
In addition to being a basic synthesizer technique used by some synthesizers, many synthesizers have a feature which allows you to modulate the frequency (pitch) of an oscillator or filter, producing rich and complex tones Also known as FM
One of three basic methods (see also Amplitude and Phase Modulation) of adding information to a sine wave signal in which its frequency is varied to impose information on it
French: modulation de fréquence (FM) The process of modifying the frequency of a carrier wave in step with the amplitude variations of the signal to be transmitted
A type of modulation in which the frequency of the carrier wave is varied above and below its normal frequency be an amount that is proportional to the amplitude of the impressed signal In this case, the amplitude of the modulated carrier wave remains constant
a modulation technique that varies (i e modulates) the carrier frequency of a transmitter in accordance with variations in the strength of the modulating audio signal
A method of modulation in which the frequency of the carrier voltage is varied with the frequency of the modulation voltage (Also see Amplitude Modulation) 2
A type of modulation in which the frequency of a continuous radio carrier wave is varied in accordance with the properties of a second (modulating) wave
A method of data transmission whereby the frequency of a sinusoidal waveform (carrier) is changed in accordance with the information that is to be transmitted
A modulation method in which the frequency of one wave (the carrier) is controlled by the amplitude of another wave (the modulator) Low-frequency FM results in vibrato Modulator frequencies that are themselves in the audio range result in the generation of sideband tones that are not necessarily present in either the carrier or the modulator
Representation of data or signal states by using different transmission frequencies Where data is in binary form the modulation constitutes two transmission frequencies and is referred to as Frequency Shift Keying (FSK)
Placing a sound wave on a carrier wave in such a way that the number of recurrences is varied; stations that broadcast between 88 and 108 megahertz 1 14, 14 6
A change in the frequency (pitch) of a signal At low modulation rates, FM is perceived as vibrato or some type of trill, depending on the shape of the modulating waveform When the modulating wave is in the audio range (above 20Hz or so), FM is perceived as a change in tone color FM synthesizers, commonly found on computer soundcards, create sounds using audio-range frequency modulation