Your idea seems to bear a few similarities to this (just in case you haven't seen it already): https://ccrma.stanford.edu/~jos/smac03maxjos/
On Mon, Apr 2, 2018 at 2:46 PM, gm <g...@voxangelica.net> wrote: > > I don't know if this idea is new, I had it for some time but have never > seen it mentioned anywhere: > > Use a filter with high q and rotate it's (complex) output by the (real) > output > of another filter to obtain a phase modulated sine wave. > Excite with an impulse or impact signal. > > It's basically crossed between modal and phase modulation synthesis. > > Now there are some ideas to this to make it practical and a useful > substitute for phase modulation and FM: > > You can use a state variable filter with an additional allpass instead of > the complex filter to obtain a filter you can pitch modulate in audio > (useful for drum synthesis ect) (or maybe the 90 shift can be designed > more efficiently > into the SVF IDK.) > > Instead of expensive trig calculations for the rotation, or using > the normalized complex signal form the other filter (also expensive) > just use a very coarse parabolic sine/cosine approximation and the real > signal, > the difference is really very small sonically, since the modulator is > still sine > and the radius stays around 1 so it's the effect of a small amplitude > modulation on the modulator > caused by the slight deviation of the circle. > I couldnt tell the difference when I tested it first. > > You need 7 mults and 4 adds in addition to the SVF for the AP and rotation > per carrier. > > But you save an envelope for each operator and have a pretty efficient > sine operator with the SVF. > And you get all the benfits of phase modulation over frequency modulation > of the > filter cutoff. > It's very useful for drum synthesis but also useful for some other > percussive sounds like "FM" pianos etc. > > Here is an audio demo, with cheap "soundboard" and some other fx added: > https://soundcloud.com/traumlos_kalt/smoke-piano-test-1-01/s-W54wz > > I wonder if this idea is new? > > _______________________________________________ > dupswapdrop: music-dsp mailing list > music-dsp@music.columbia.edu > https://lists.columbia.edu/mailman/listinfo/music-dsp > >
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