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