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Frequency modulation - Modulation Index | | Frequency modulation - Modulation Index: Encyclopedia II - Frequency modulation - Modulation Index | | As with other modulation indices, in AM this quantity indicates by how much the modulated variable varies around its unmodulated level. For FM, it relates to the variations in the frequency of the carrier signal:
With a tone-modulated FM wave, if the modulation frequency is held constant and the modulation index is increased, the (non-negligible) bandwidth of the FM signal increases, but the spacing between spectra stays the same.
If the frequency deviation is held constant and the modulation index increased, the bandwidth stays rou ...
See also:Frequency modulation, Frequency modulation - Applications in radio, Frequency modulation - Theory, Frequency modulation - Modulation Index | | | Frequency modulation, Frequency modulation - Applications in radio, Frequency modulation - Modulation Index, Frequency modulation - Theory, Frequency modulation synthesis (FM as an audio synthesis method), Modulation index, Modulation, for a list of other modulation techniques, History of radio | | |
| | | Frequency modulation: Encyclopedia II - Frequency modulation - Modulation Index
Frequency modulation - Modulation Index
As with other modulation indices, in AM this quantity indicates by how much the modulated variable varies around its unmodulated level. For FM, it relates to the variations in the frequency of the carrier signal:
With a tone-modulated FM wave, if the modulation frequency is held constant and the modulation index is increased, the (non-negligible) bandwidth of the FM signal increases, but the spacing between spectra stays the same.
If the frequency deviation is held constant and the modulation index increased, the bandwidth stays roughly the same, but the spacing between spectra decreases.
Other related archives1935, BBC, Bessel functions, Carson's rule, Digital, Edwin Armstrong, FM broadcasting, FM radio, FM stereo, FM synthesis, Frequency modulation synthesis, Frequency-shift keying, History of radio, Institute of Radio Engineers, Manchester encoding, Modulation, Modulation index, Morse code, New York, November 6, V2000, VCR, VHF, VHS, adjacent channel, adjective, amateur radio, amplitude, amplitude modulation, analog, attributively, audio frequencies, bandwidth, broadcasts, carrier wave, dB, data, drift, equalisers, frequency, frequency deviation, frequency spectrum, frequency-change signaling, frequency-shift keying, harmonic, hertz, high fidelity, high-fidelity, information, instantaneous frequency, interference, limiter, luminance, megahertz, modulation, modulation indices, multiplexing, music, narrowband, noise reduction, personal computer, phase modulation, phenomenon, pre-echo, print-through, radio, radio frequencies, radio-teletype, receivers, rule of thumb, selectivity, sine wave, sinusoidal, sound cards, speech, standard, stereo, synthesizers, timebase correction, tuner, voice
 Adapted from the Wikipedia article "Modulation Index", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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