The resonance in low pass filter with an order greater than 2 is basically just a feedback from the output to the input. You need to switch the polarity of the signal, in other words, you subtract the output from the input, in order to place the feedback point to the point, where the phase shift of the low pass filter is 180 degrees.
Hope this helps you to get started. Best, Steffan Von meinem iPad gesendet > Am 20.07.2018 um 12:13 schrieb Mehdi Touzani <mehdi.touz...@gmail.com>: > > Hi all, > I follow the llist for a while, but I am not a DSP programmer, I do DSP audio > apps for about 20 years now, for sonic core plateform "Scope" and Xite". I > begin with other things like juce or flowstone, but so far, scope is still > far superior in terms of sound results. Too bad there is no scripting tool > for it (well there is but it is not available to me). > > My question is probably weird for you - like super noob - , because i am NOT > looking for math or codes, but hints about a general design/architecture. > > So... how do you do a resonance in a lowpass circuit? :-) not the math, > not the code, just the architecture. > > Personnally, i came to the conslusion that some kind of very short delay > with feedback, mixed in parallel with the non resonance low pass sound, could > do the trick. . The more feedback, the more resonance, and with feedback over > -6dB, it would begin to self resonate. > > But it is having the resonance in parralel to a dry sound that bothers me; > but may be that's the only way to do ? > > I have read about hardware filters and ok, there is math, but there is also > the effect of the hardware components. Some articles even suggest that a > bandpass in parralel could do the trick : or more exactly, a bandpass > fonction is created after the resonance, to remove frequencies that would > overlap with the cutoff. > > > So, any hints that could help me improve the process etc would be very > welcome. > > Thanks > > Mehdi > _______________________________________________ > dupswapdrop: music-dsp mailing list > music-dsp@music.columbia.edu > https://lists.columbia.edu/mailman/listinfo/music-dsp
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