Re: [LAD] A short technote on digital state-variable filters

Hi Fons, I have a question (sanity checking my understanding) regarding the implementation: You note in your introduction that the SV-Filter provides lowpass, highpass and bandpass outputs. If I wanted to provide all three to the user then this could be done with the following C-Code, right (adapted from your individual examples)? d0_high = 1 - c1 / 2 + c1 * c2 / 4; d1_band = 1 - c2; d0_band = d1 * c1 / 2; d0_low = c1 * c2 / 4; d1_low = c2; for (i = 0; i < n; ++i) { x = inp[i] - z1 - z2; out_high = d0_high * x; out_band = d0_band * x + d1_band * z1; z2 = c2 * z1; out_low = d0_low * x + z2; z1 = c1 * x; } Regards, FPS Oh, looking at it again, and if I'm not completely confused, this should also be equivalent: for (i = 0; i < n; ++i) { x = inp[i] - z1 - z2; z2 = c2 * z1; out_high = d0_high * x; out_band = d0_band * x + d1_band * z1; out_low = d0_low * x + z2; z1 = c1 * x; } On 11/19/2020 10:05 PM, Fons Adriaensen wrote: -- https://fps.io