local time-frequency analysis
Wavelet Based Edge Detection Technique for Iris Recognition Using MATLAB
... for time-frequency ...“time local “function called the “window” ...optimal time frequency localization by scaling functions and ...the time-frequency window sizes ...
5
Advanced Time-Frequency Representation in Voice Signal Analysis
... of non-stationary signals. Nevertheless, a critical point of these methods is their readability, which means both a good concentration of the sig- nal components and no misleading interference terms. Some efforts have ...
9
Local time dependence of the dominant frequency of Pi2 pulsations at mid and low latitudes
... The Pi2 pulsations examined in this paper were automat- ically detected by a wavelet analysis. The method is devel- oped by Nos´e et al. (1998), which is suitable for damping and short-lived waves such as Pi2 ...
11
On Inversion of Continuous Wavelet Transform
... This study deduces a general inversion of continuous wavelet transform (CWT) with timescale being real rather than positive. In conventional CWT inversion, wavelet’s dual is assumed to be a reconstruction wavelet or a ...
7
Time frequency analysis in terahertz pulsed imaging
... materials, analysis of waveforms is usually based on Fourier decomposition [Papoulis ...more local, time specific, ...the time axis) and a flattening, or spreading, that are characteristic of ...
42
A review of developments of EEG based automatic medical support systems for epilepsy diagnosis and seizure detection
... domain analysis is based on Fourier trans- form which decomposes EEG signals into different fre- quency ...in frequency domain ...in time domain is revealed by means of fre- quency ...of ...
9
Research and Comparison of Time-frequency Techniques for Nonstationary Signals
... five time-frequency analysis methods, ...the local information of nonstationary signals in a high time- frequency ...the time-frequency aggregation and cross ...
5
Identifying interactions in the time and frequency domains in local and global networks : a Granger causality approach
... the analysis tools currently used for the whole net- work are based on clustering ...Such analysis has proven to be useful in discovering genes that are co-regulated and/or have similar ...for ...
18
A general theory on frequency and time–frequency analysis of irregularly sampled time series based on projection methods – Part 2: Extension to time–frequency analysis
... the time–frequency plane, a polynomial trend, and a background ...by local aliasing issues. The local amplitude in the time–frequency plane is then estimated with least-squares ...
26
Irregularity detection in artificial signal using time frequency analysis
... wavelet analysis is one of the best appropriate and favourite types of TFR by most researchers for analysing non stationary and non linear signal ...type analysis as plotted in the Figure-2a able to ...
5
Time frequency analysis of systems with changing dynamic properties
... each time instant. In the analysis of the behavior of real systems, physical properties are typically inferred from the building ...as time-frequency analysis are a valuable tool for ...
277
Elementary Time Frequency Analysis of EEG Signal Processing
... for analysis has an disadvantage that spectrum of the signals is degraded due to short term windowing analysis and fixed ...of frequency domain analysis but has disadvantage of improper ...
6
Significance of Cohen's Class for Time Frequency Analysis of Signals
... of time-frequency techniques in signal analysis and detection has been studied by many researchers at ...performing time-frequency analysis of ...of time- frequency ...
8
High-Resolution Time-Frequency Methods' Performance Analysis
... and (iii) objective assessment of TFDs [1–3]. Tradeo ff between concentration and CTs’ removal is a classical prob- lem. The concepts of concentration and resolution are used synonymously in literature whereas for ...
7
Design and Optimization of Kernel Function in Time Frequency Analysis
... (2) In equation (2), is the time delay and is the frequency offset. Usually, the self-term part of the signal in the fuzzy domain is concentrated around the center of the origin, and the interference ...
6
Time-Frequency Analysis and Its Application in Digital Watermarking
... Various frequency-modulated nonstationary signals can be a watermark, as ...different time-frequency distributions should be used for watermark ...quadratic frequency- modulated ...
20
Time frequency analysis of electrical brain responses to nociceptive stimulation
... the frequency instead, we can acquire an optimal compromise for time-frequency resolution at every frequency of the ...with frequency dependent window width is illustrated in figure ...
27
Sparse Time-Frequency Data Analysis: A Multi-Scale Approach
... I need to express my deepest gratitude to my research adviser, Prof. Thomas Y. Hou, for his support, encouragement, and guidance throughout my Ph.D. re- search journey at Caltech. I have benefited greatly from his broad ...
197
Local time dependence of the frequency of Pi2 waves simultaneously observed at 5 low latitude stations
... the frequency of Pi2 waves, we need to consider the following two ...a local time dependence of the frequency when the plasmasphere has a non-uniform structure in longi- tudinal ...mode ...
12
Characteristic frequencies of the human blood distribution system
... However, there are two major difficulties related to the frequency analysis of such signals: i time-variation of their characteristic frequencies, which demands an analysis in the time-f[r] ...
10