"Phase Vocoder Done Right" is a fairly interesting new paper I came across, that talks about a strategy to preserve both vertical and horizontal phase coherence. Examples (which sound pretty good) and link to paper are here: http://ltfat.github.io/notes/050/
-Corey On Mon, May 21, 2018, 06:46 Chris Cannam <can...@all-day-breakfast.com> wrote: > > On Sat, 19 May 2018, at 21:34, RJ Skerry-Ryan wrote: > > It may not be the state of the art, but RubberBand > > <https://breakfastquay.com/rubberband/> is, I believe, the best open > source > > pitch shift / time stretch library out there at the moment, and can run > in > > realtime on modern CPUs. > > See here for a page very briefly summarising how Rubber Band works: > https://breakfastquay.com/rubberband/technical.html > In short, it's a phase vocoder that uses a handful of the available tricks > to try to reduce phasiness, without doing any very expensive analysis such > as sinusoidal modelling. > > There is actually a fine sinusoidal-modelling time stretcher hiding in > Audacity, using the SBSMS library by Clayton Otey. This isn't a real-time > method as far as I can see, and is slow to run, but it's worth checking out > -- you activate it by selecting the Change Tempo or Change Pitch effect and > checking the option labelled "Use high quality stretching". Code at > https://github.com/audacity/audacity/tree/master/lib-src/sbsms. > > Stephan Bernsee's old post is a bit of a puzzle, since it contains quite a > lot about analysis/resynthesis but very little about actual pitch shifting. > > > Chris > _______________________________________________ > dupswapdrop: music-dsp mailing list > music-dsp@music.columbia.edu > https://lists.columbia.edu/mailman/listinfo/music-dsp > >
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