THE WAVELET TUTORIAL


by Robi POLIKAR

About The Figures

I have generated these plots with a MATLAB code I have written for continuous and discrete wavelet transforms. It took quite some time to plot the figures, and reformat them, so that they are Mosaic readable. Please give credits if you mail this tutorial to someone, or show them to someone. I will appreciate any comments on these pages. You may e-mail them to me to: rpolikar@iastate.edu The cover figure, is the continuous wavelet transform of the following signal: The same plot from different views are given in part 2 of the tutorial. The code of this signal for MATLAB is as follows: t=0.1:0.001:0.2; fff1=2*cos(2*pi*10*t); % 10 Hz. signal t=0.2:0.001:0.3; fff2=6*cos(2*pi*40*t)+4*cos(2*pi*10*t); % 40 and 10 Hz signal at the same times t=0.3:0.001:0.356; % 20 Hz signal fff3=10*cos(2*pi*20*t); fff=[fff1 fff2 fff3 fff3(51:-1:1) fff2(101:-1:1) fff1(101:-1:1)]; %Making the above signal symmetric . That is where you see the discontinuity in the above plot.
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