� lemme know if this doesn't work:�https://www.dropbox.com/s/cybcs7tgzgplnwc/wavetable_oscillator.c remember that this is *synthesis* code.� it does not extract wavetables from a sampled sound (i wrote a paper a quarter century ago how to do that, but it's not code).� nor does it define bandlimited square, saw, PWM, hard-sync, whatever.� that's a sorta difficult problem, but one that someone has for sure solved and we can discuss here how to do that (perhaps in MATLAB).� extracting wavetables from sampled notes requires pitch detection/tracking and interpolation. L8r, r b-j ---------------------------- Original Message ---------------------------- Subject: Re: [music-dsp] Antialiased OSC From: ćwiek <nap...@gmail.com> Date: Fri, August 3, 2018 6:00 pm To: r...@audioimagination.com music-dsp@music.columbia.edu -------------------------------------------------------------------------- > Can you provide the code with something like pastebin/ Dropbox / gdrive? > I'm also very interested in seeing this implementation. > Thanks, > napent > > sob., 4 sie 2018, 00:57 użytkownik robert bristow-johnson < > r...@audioimagination.com> napisał: > >> >> >> ---------------------------- Original Message ---------------------------- >> Subject: [music-dsp] Antialiased OSC >> From: "Kevin Chi" <s...@finecutbodies.com> >> Date: Fri, August 3, 2018 2:23 pm >> To: music-dsp@music.columbia.edu >> -------------------------------------------------------------------------- >> > >> > Is there such a thing as today's standard for softSynth antialiased >> > oscillators? >> >> i think there should be, but if i were to say so, i would sound like a >> stuck record (and there will be people who disagree). >> >> >> stuck record: "wavetable ... wavetable ... wavetable ..." >> >> >> > >> > I was looking up PolyBLEP oscillators, and was wondering how it would >> relate >> > to a 1-2 waveTables per octave based oscillator or maybe to some other >> > algos. >> > >> > thanks for any ideas and recommendations in advance, >> >> if you want, i can send you a C file to show one way it can be done. >> Nigel Redmon also has some code online somewhere. >> >> if your sample rate is 48 kHz and you're willing to put in a brickwall LPF >> at 19 kHz, you can get away with 2 wavetables per octave, no aliasing, and >> represent each surviving harmonic (that is below 19 kHz) perfectly. if >> your sample rate is 96 kHz, then there is **really** no problem getting the >> harmonics down accurately (up to 30 kHz) and no aliases. >> >> even though the wavetables can be *archived* with as few as 128 or 256 >> samples per wavetable (this can accurately represent the magnitude *and* >> phase of each harmonic up to the 63rd or 127th harmonic), i very much >> recommend at Program Change time, when the wavetables that will be used are >> loaded from the archive to the memory space where you'll be >> rockin'-n-rollin', that these wavetables be expanded (using bandlimited >> interpolation) to 2048 or 4096 samples and then, in the oscillator code, >> you do linear interpolation in real-time synthesis. that wavetable >> expansion at Program Change time will take a few milliseconds (big fat >> hairy deal). >> >> lemme know, i'll send you that C file no strings attached. (it's really >> quite simple.) and anyone listening in, i can do the same if you email >> me. now this doesn't do the hard part of **defining** the wavetables (the >> C file is just the oscillator with morphing). but we can discuss how to do >> that here later. >> >> >> -- >> >> r b-j r...@audioimagination.com >> >> "Imagination is more important than knowledge." >> >> >> >> >> >> >> >> _______________________________________________ >> dupswapdrop: music-dsp mailing list >> music-dsp@music.columbia.edu >> https://lists.columbia.edu/mailman/listinfo/music-dsp > � � � -- r b-j� � � � � � � � � � � � �r...@audioimagination.com "Imagination is more important than knowledge." � � � �
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