Hi,
I have created a flash tutorial program to illustrate the Discrete Fourier Transform.
It is located:
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It allows you to draw a function and then use the flash program to calculate a 16 point DFT on the function you created.
There is also a flash program that helps illuminate the basis functions used in the DFT.
Brent
PS: My next step is to extend this and show why windowing is needed and give some insight into how it works.