[Fons Adriaensen] >I've learned to mute monitoring while doing such tests... I was suspecting you had :) >> It adds to the evidence that implementing thorough control >> smoothening is inevitable in the long run. > >That may or not solve the problem. You have 3 input parameters >(P), and 5 biquad coefficients (C). Interpolating the C can >make a biquad unstable, and if this happens it doesn't matter >how fast or slow you do it. The only solution is to interpolate >the C only between sets of values that correspond to values of >the P that are not too far apart. So you need two levels, first >on the P to limit the rate of change of the parameters, then on >the C to avoid zipper noise. I'm planning to evade this problem by crossfading between two parallel static filters. Some phase mismatch issues can probably be expected when the parameter sweep covers a larger range, but I'm hopeful it will turn out not to be much of a problem in actual practice, and that we will find out soon. It really needs a fix. Tim _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
