信号的时频分析-4.ppt

“Time-Frequency Analysis” ApplicationsSeminar 2011.5.5 Applications of Wavelets Compression De-noising Feature Extraction Discontinuity Detection Distribution Estimation Data analysis Biological data Financial data …… Compression DWT is commonly used for compression, since most DWT are very small, can be zeroed-out! Compression Compression ECG- Compression Denoising Implementation in Matlab Denoising Using Matlab Denosing Using Matlab Discontinuity Detection Discontinuity Detectionwith CWT Application Overview Data Compression Wavelet Shrinkage Denoising Source and Channel Coding Biomedical Engineering EEG, ECG, EMG, etc analysis MRI Nondestructive Evaluation Ultrasonic data analysis for nuclear power plant pipe inspections Eddy current analysis for gas pipeline inspections Study of Distant Universes Galaxies form hierarchical structures at different scales Application Overview Wavelet Networks Real time learning of unknown functions Learning from sparse data Turbulence Analysis Analysis of turbulent flow of low viscosity fluids flowing at high speeds Topographic Data Analysis Analysis of geo-topographic data for reconnaissance / object identification Fractals Daubechies wavelets: Perfect fit for analyzing fractals Financial Analysis Time series analysis for stock market predictions Wavelets and fMRI data analysis Literature EEGLAB: an open source toolbox for analysis of single-trial EEG dynamics including independent component analysis Journal of Neuroscience Methods 134 (2004) 9–21 Arnaud Delorme, Scott Makeig 1173 ERSP EEGLAB uses either the short-time Fourier transform, a sinusoidal wavelet (short-time DFT) transform, or a Slepian multitaper decomposition (Thompson, 1982) that provides a specified time and frequency resolution. ITC ERCOH EEGLAB function crossf() computes event-related coherence (ERCOH) between two channel or component activities in sets of trials to determine the degree of synchronization between the two activity measures. ER