IF

(redirected from Instantaneous frequency)
Also found in: Encyclopedia.
AcronymDefinition
IFIntermediate Frequency (radio/communications systems)
IFIn Fact
IFInternational Falls (city on the Minnesota/Canada border)
IFIndia Forum (India)
IFInteractive Fire (insurance)
IFInteractive Fiction
IFInvolved Field (radiotherapy)
IFIndustrial Facilities
IFInstitute for the Future
IFIndustrial Fund
IFInterface
IFInput File (Linux command line)
IFInformation Flow
IFIntegrated Farm
IFImpact Factor
IFIntegration Facility
IFIntelligence Flight
IFIntelligent Finance (Halifax Group)
IFInternational Federation (sports)
IFInteraction Forum
IFIntelligence Fusion
IFIntegration Framework
IFImmediate Frequency
IFIntermediate Fix
IFIce Fog
IFInternational Fleet (game and book)
IFInternal Focusing
IFInternal Flush
IFInterference (Dutch electro artist)
IFIndirect Fire
IFIn Flames (band)
IFIsolation Filter
IFIsolation Function
IFInitiation Factor
IFInterference Filter
IFInstruction Fetch
IFInternally Flawless (2nd highest quality of diamond)
IFInfertility
IFInternal Fixation
IFIntermittent Fasting (dieting)
IFIntrinsic Factor
IFIncremental Funding
IFInformation Directorate (at AFRL)
IFInstantaneous Frequency
IFIntermediate Filament (genetics)
IFIdaho Falls (Idaho)
IFIntrinsically Funny
IFInfield (baseball/softball)
IFInterstitial Fluid
IFInterferon
IFInfielder
IFIronforge (World of Warcraft city)
IFImmunofluorescence
IFInvisionFree (Invision Power Board)
IFIntermediate Filament (cytoskeletal component)
IFInduction Furnace (metal melting)
IFIfosfamide
IFIndependent Force
IFInternational Fleet (Ender's Game novel)
IFInterrupt Flag
IFIndemnité Forfaitaire (French: Liquidated Damage)
IFInstant Form (software)
IFInterferential Stimulation
IFInterference Field
IFIntruders Foundation
IFIntake Fraction (the fraction of a pollutant which is inhaled by humans)
IFInterface Freeze
IFIntrinsic Free (steel)
IFInfra-Free
IFIntermediate Forward
IFInland Fetch (line)
IFIngenico Fortronic Ltd
IFIntelligent Field Co., Ltd. (Japan)
IFIntercept and Broadcast (US Navy)
IFInternationally Flawless (diamonds)
References in periodicals archive ?
F0 trajectory smoothing is based on the calculated high-frequency energy ratio, the minimum noise energy equivalent, in the instantaneous frequency selected the most likely F0, and thus constitutes a smooth pitch trajectory.
(4) The Hilbert transform of each IMF (i.e., the HHT) is computed to get the instantaneous frequency of each IMF in the studied segment.
The Hilbert transform is general and global, but the instantaneous frequency [omega] = [d [theta](t)/dx](based on the transform) is restrictive and local.
Instantaneous frequency f(x) can be obtained through the pure FM signal [s.sub.i](t):
The instantaneous frequency is defined as the derivative of the instantaneous phase:
It creates the impression that these terms must be available or the good properties of WVD (localization, group delay, instantaneous frequency, marginal properties, etc.) cannot be fulfilled.
5 shows the instantaneous frequency of different MFSK signals after the first time wavelet transform, and the mutation frequency can be observed clearly.
In addition, the LMD iteration process which uses smoothed local means and local magnitudes avoids the cubic spline approach used in EMD [19], which maybe bring the envelope errors and influence on the precision of the instantaneous frequency and amplitude.
After decomposition of the signal into separate components [h.sub.k][n] with defined instantaneous frequency:
[f.sub.o] is the instantaneous frequency, [f.sub.r] is the nominal frequency, and [x.sub.i] is the clock time error at the ith measuring instant.
The EMD method is based on the concept of instantaneous frequency defined as the derivative of the phase of an analytic signal [12].
Standard deviation of absolute value of the normalized centered instantaneous frequency ( Standard deviation of direct value of the normalized centered instantaneous frequency ( Maximum value of the power spectral density of the normalized centered instantaneous amplitude ( .
Full browser ?