[PD] basic DSP stuff

[Piotr Majdak]

Chuckk Hubbard wrote:

> One more question... regarding how filters work, is there no intuitive 
> way to express it?

For me, the most intuitive way to explain a filter is looking at 
convolution. Every linear filter can be described as a convolution of a 
signal with the impulse response of a filter. Although, any pole in a 
filter leads to a impulse response with infinite length and for the 
explanation it's easier to look at a finite impulse response.

A great link to explain filtering by convolution is the "joy of 
convolution": http://www.jhu.edu/~signals/convolve/
There is a java applet where you can play with convolution a little bit...


br,

Piotr