On Tue, Jul 14, 2009 at 3:05 PM, Ken Restivo<ken@xxxxxxxxxxx> wrote: > I have a couple DSP-for-dummies questions. > > I'm still intrigued by the idea of getting a proper Auto Wah-Wah sound going. > > I like the approach of building one out of LADSPA plugins. > > My question is this: what tools would I use on Linux to analyze the frequency response and characteristics of the many, many LADSPA filter plugins, so as to decide which has the response closest to a real wah circuit (i.e. a lowpass with a resonant peak just above the rolloff point)? > > What I'm going for is this: > http://www.geofex.com/Article_Folders/wahpedl/wahped.htm > > I don't know squat about DSP, otherwise I might just try coding something up; the LADSPA spec looks pretty straightforward. > > -ken > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user > Try running a white noise source through the filter, then look at the spectral graph output in your favorite spectrum analysis program. Since white noise should have a flat spectrum, any peaks and valleys in the output are those of the filter. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
