frequency modulation


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Related to frequency modulation: phase modulation, amplitude modulation
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Synonyms for frequency modulation

modulation of the frequency of the (radio) carrier wave

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Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The distributions (as well as the corresponding scatter-plots, not shown for brevity) indicate an increase of the local extinction events by more than 50% for all frequency modulations, at least for the selected monitoring point.
This PDPWM with odd number of frequency modulation index produces the odd numbered harmonics only in the output of the inverter and all the lower order harmonics are well within the limit of IEEE-519 standard.
where [S.sub.1](t) is sine frequency modulation signal, of which the frequency is 25 Hz and [S.sub.2](t) is random noise, of which the amplitude is 0.3.
Glenn also provided useful suggestions to improve the English, and Klaus-Gerhard Heller reminded me of the frequency modulation, which I had forgotten in the first draff.
But before construction reaches maximum amplitude value frequency modulation of reference impact occurs, that reduce amplitude value.
The effect of PAPR in OFDM signal for radar applications can be overcome by transforming it into a Constant Envelope OFDM (CE- OFDM) signal either via phase or frequency modulation as shown in Fig.1, thus generating a linear region suitable for power amplification of high power requirements of radar.
Therefore, we use the [S.sup.2]-method to analyze sea clutter contaminated by ionospheric phase perturbation with large amplitude and extract ionospheric frequency modulation from the time-frequency distribution of echo data to sharp the broadening sea clutter spectrum.
[n.sub.sync]: Synchronous speed of motor P: Number of poles [[omega].sub.ref] Reference speed [[omega].sub.r]: Rotor speed [[omega].sub.s]: Slip speed [[omega].sub.e]: Inverter command frequency [V.sub.abc]: Inverter output voltage [V.sub.abc*]: Inverter command voltage [f.sup.*]: Command frequency to inverter [V.sub.dc]: DC bus voltage of inverter f: Electrical frequency PI: Proportional integral controller e: Error signal [m.sub.a]: Modulation index [m.sub.f]: Frequency modulation ratio [f.sub.c]: Carrier frequency [f.sub.h]: Frequencies at which harmonics occur [f.sub.1]: Fundamental frequency.
While a specific mechanism of frequency modulation has not yet been demonstrated in frogs, they should be able to vary the frequency of their calls by varying the pressure in their lungs.
J, "Reduced Switching Frequency Modulation Algorithm for High Power Multilevel Inverters", IEEE Trans.
[K.sub.[eta]] is the chirp rate of Linear Frequency Modulation (LFM).
Whereby the range resolution is inverse proportional with the frequency band of the scanning signals, in the last period of time, in radar systems theory a lot of suitable wideband signals (e.g., short radio pulse, signals with discrete frequency modulation, signals with LFM or NLFM, unsinusoidal signals etc.) were designed and analyzed as performance level (e.g., using the well-known ambiguity function tool etc.).
It is clear that the jamming signals are made up of N segment LFM signals, whose frequency modulation slope is k, pulse width is [tau], and frequency modulation bandwidth is [B.sub.J] = k[tau].
Other effects such as power supply noise may also introduce laser frequency fluctuations which can be modeled as a frequency modulation with a sinusoid of large amplitude (e.g., ~250 MHz) and low frequency (e.g., [less than or equal to] 35 KHz) [16].
FM-101, the most popular channel of Radio Pakistan, is the biggest frequency modulation transmission network in the country with nine broadcasting houses all over Pakistan.
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