Invisible wrote:

> You know how if you JPEG-compress something too much, you get ghosting? 
> Well if you aren't careful with your filter kernel, your frequency 
> response ends up with ghosting. The Blackmann window is a way to try to 
> get rid of that. (By blurring the whole thing, unfortunately.)

According to the book, my thinking was sound. You take an iFFT of the 
arbitrary filter, apply a Hamming or Blackmann window to the shifted and 
zero-padded filter kernel. Then you execute the filter by convolution, 
or FFT convolution. Depending on the size of the filter kernel you've 
generated. Bigger means FFT is more advantageous.

That's for FIR filters.

Now I'm reading a bout IIR filters and ... they're simple to code, but a 
bear to design..

-- 
~Mike

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