I think the key, in the request, is “realtime” (although he also says "ideally in the frequency domain”—not that they are mutually exclusive for practical use, just that it raises questions in my mind exactly what he’s after). I’ve never used Melodyne, but I think it’s designed around non-realtime, no? It’s been around a long time, so maybe it is usable realtime, but for old questions on the web I see the answer “no”.
Again, my knowledge of Melodyne is limited (to seeing a demo years ago), but I assume it’s based on somewhat similar techniques to those taught by Xavier Serra (https://youtu.be/M4GRBJJMecY <https://youtu.be/M4GRBJJMecY>)—anyone know for sure? > On May 17, 2018, at 5:32 PM, robert bristow-johnson > <[email protected]> wrote: > > > the current state of the art for pitch manipulation is, of course, Melodyne. > > dunno how Peter Neubacker does it. > > somewhere, i have some old MATLAB code that does a time-scaling via > phase-vocoder. you can combine that with resampling to get a pitch shifter. > > if it's pitch shifting a monophonic note, i would recommend a decent > time-domain cross-fading method that has a decent pitch detector so that the > splice displacements are good. > > a Laroche/Dolson did a real-time phase vocoder pitch shifter. all doable but > it's not a small project. > > > ---------------------------- Original Message ---------------------------- > Subject: [music-dsp] Real-time pitch shifting? > From: "Matt Ingalls" <[email protected]> > Date: Thu, May 17, 2018 4:24 pm > To: [email protected] > -------------------------------------------------------------------------- > > > I tried porting Stephan Bernsee’s code from his old DSP Dimension blog: > > http://blogs.zynaptiq.com/bernsee/pitch-shifting-using-the-ft/ > > <http://blogs.zynaptiq.com/bernsee/pitch-shifting-using-the-ft/> > > > > But it sounds pretty crappy, even compared to simple time-domain linear > > interpolation. > > > > And now wondering what's the state of the art for real-time pitch > > manipulation? > > (for my purposes, ideally in the frequency domain) > > > > Is it still just phase vocoder with peak-detection ala Laroche/Dolson? > > https://www.ee.columbia.edu/~dpwe/papers/LaroD99-pvoc.pdf > > > > Thanks! > > Matt > > > > _______________________________________________ > > dupswapdrop: music-dsp mailing list > > [email protected] > > https://lists.columbia.edu/mailman/listinfo/music-dsp > > > > > > -- > > r b-j [email protected] > > "Imagination is more important than knowledge." > > > > > > _______________________________________________ > dupswapdrop: music-dsp mailing list > [email protected] > https://lists.columbia.edu/mailman/listinfo/music-dsp
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