19 Mar
2013
19 Mar
'13
3:09 a.m.
On Mon, Mar 18, 2013 at 11:45 PM, Fons Adriaensen <fons(a)linuxaudio.org>wrote;wrote:
A critically damped
second order lowpass with a rise time of 30 ms or so will eliminate all
audible artefacts. It's very low on CPU and you only need to run it while
the gain is changing.
Although I understand the words & their meaning, I have no idea how to
start implementing such a filter.
I've found a 1st order algorithm on musicdsp:
http://www.musicdsp.org/showone.php?id=257
Since its second order I understand it needs the previous 2 outputs.
Critically dampened implies that the "factor" of influence of the previous
samples is very close to 1 ( 'a' in the algorithm linked )
How is the "rise time" determined here?
Noobie questions :) -Harry