Results 11 to 20 of about 75,899 (299)
Novel Method for Vibration Sensor-Based Instantaneous Defect Frequency Estimation for Rolling Bearings Under Non-Stationary Conditions [PDF]
Sensors, 2020 It is proposed a novel instantaneous frequency estimation technology, multi-generalized demodulation transform, for non-stationary signals, whose true time variations of instantaneous frequencies are unknown and difficult to extract from the time ...
Dezun Zhao +3 more
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The relationship between instantaneous frequency and time-frequency representations [PDF]
IEEE Transactions on Signal Processing, 1993 This paper describes a procedure for the time-frequency analysis of signals based on Time-Frequency Distribution (TFD) and Instantaneous Frequency (IF) estimation. First we use a suitable TFD to determine the number of signal components. Then if the signal is monocomponent , the IF law cam be estimated directly.
Brian C. Lovell +2 more
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Instantaneous Frequency Extraction Using the EMD-Based Wavelet Ridge to Reveal Geological Features [PDF]
Frontiers in Earth Science, 2018 As one of the important seismic attributes, instantaneous frequency (IF) is widely used to reveal geological features. Compared to the normally IF extraction using Hilbert transform (HT), IF extraction using the wavelet ridge is demonstrated to have a ...
Ya-juan Xue +4 more
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A New Approach for Estimation of Instantaneous Mean Frequency of a Time-Varying Signal [PDF]
EURASIP Journal on Advances in Signal Processing, 2005 Analysis of nonstationary signals is a challenging task. True nonstationary signal analysis involves monitoring the frequency changes of the signal over time (i.e., monitoring the instantaneous frequency (IF) changes).
Krishnan Sridhar
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Instantaneous Frequency Estimation and Localization [PDF]
, 2016 In many applications, a critical feature of a nonstationary signal is provided by its instantaneous frequency (IF), which accounts for the signal spectral variations as a function of time. This chapter presents methods and algorithms for the localization and estimation of the signal IF using timefrequency (t, f) based methods.
El-Jaroudi, A. +13 more
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An iterative method for instantaneous frequency estimation [PDF]
, 2021 In this paper, we propose an iterative method to estimate the instantaneous frequency of a signal based on the discrete evolutionary transform (DET). The DET provides a representation for non-stationary signals and a time-frequency kernel that permits us
Yalcin, M, Akan, A, Chaparro, LF
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Time-frequency and instantaneous frequency concepts [PDF]
, 2016 The previous chapter introduced the field of time-frequency (t, f) signal analysis and processing (TFSAP), which concerns the analysis and processing of signals with time-varying frequency content. Such signals are best represented by a time-frequency distribution (TFD), which is intended to show how the energy of the signal is distributed over the two-
Boashash, B.
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IEEE Access, 2020 The time-frequency energy distribution processed by a short-time Fourier transform can be compressed to the real instantaneous frequency by the synchrosqueezing transformation (SST), which improves the time-frequency energy concentration of the signal ...
Xin Li +3 more
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Rule-Based EEG Classifier Utilizing Local Entropy of Time–Frequency Distributions
Mathematics, 2021 Electroencephalogram (EEG) signals are known to contain signatures of stimuli that induce brain activities. However, detecting these signatures to classify captured EEG waveforms is one of the most challenging tasks of EEG analysis. This paper proposes a
Jonatan Lerga +3 more
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Definition of instantaneous frequency on real signals [PDF]
, 2000 This paper introduces a definition of the instantaneous frequency (IF) on real signals. Basically the definition ωt = xt/√1 - x2t avoids some pitfalls associated with the corresponding definition on analytic signals.
Saliu, Sokol,
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