[sdiy] Looking for cheap lowpass filter algorithm

[René Schmitz]

Seb Francis wrote:
> paul.maddox.mail-list at synth.net wrote:
> I thought someone might come up with an analog suggestion ;)
> 
> Unfortunately this is not practical as most of the time the software 
> will use 48kHz sampling rate, and only switched in software to use 24kHz 
> when delay time needs to be more than the RAM can hold.

Analog switch selecting between one of two filters?
(However steep analog filters aren't exactly simple either, you need to 
sacrifice quite a bit of your passband to get enough stopband 
attenuation. Consider fs*0.3 a good starting point.)

Cheers,
  René

-- 
uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159