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
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