On Thu, 26 Oct 2006, Pall Thayer wrote:
Yeah, I thought about that but does one then set each of the lop~'s for
10Hz or try to spread the 10 between them like:
[lop~ 2.5]*4 or [lop~ 10]*4
You want to cut at 10 Hz so you put four of them at 10 Hz.
Each linear filter has a fixed gain for each frequency. The log-log
spectrum of one filter drops suddenly around 10 Hz with a straight slope.
With several filters in series, the log-log spectra add up, so the slope
becomes steeper.
I suppose that you've seen log-log graphs before? for a function y=f(x),
they have log(y) and log(x) axes, instead of y and x axes.
_ _ __ ___ _____ ________ _____________ _____________________ ...
| Mathieu Bouchard - tél:+1.514.383.3801 - http://artengine.ca/matju
| Freelance Digital Arts Engineer, Montréal QC Canada
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