Excerpts from fons's message of 2010-09-29 15:50:43 +0200: > On Wed, Sep 29, 2010 at 06:11:36AM -0700, Patrick Shirkey wrote: > > > Otherwise in the interests of keeping a relatively convivial tone I would > > like to thank you for spotting the flaws that you have found. > > Here's one more: > > <http://www.kokkinizita.net/linuxaudio/jamin-iir-xover.png> > > This the frequency response (no EQ or whatever) using the IIR crossover, > set to 500 Hz and 3 kHz. Those 'qualitatively more experienced DSP > engineers' don't apparently have the experience to perform even the > simplest of tests. Nor do they know that the type of filter used will > produce antiphase signals at the crossover frequency. > > (Hint: invert the mid band). > > Ciao, > > -- > FA > > There are three of them, and Alleline. Wow, those dips are pretty deep.. about 25 dB.. Do I understand your hint correctly when I guess that if you invert the mid band and add it at the right level the whole thing would end up more or less flat? I don't know when the actual processing happens, but I guess if you invert the mid band you will need to handle that a bit differently as well. Maybe that's all total bollocks though :) _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
