Hi, I have read many reports and seen several explanations but I still can not figure out how it works ?
1. There was wriiten to use with STFT and iSTFT but on code example I see FFT and iFFT. Why ? 2. I don't understand which steps I need to do if I just want to change pitch(without duration) ? Thanks, Alex בתאריך יום ב׳, 15 באוק׳ 2018 ב-21:57 מאת robert bristow-johnson < r...@audioimagination.com>: > i have some old MATLAB code that does the phase vocoder implementing > time-scaling with a little extra thing that scales the sweep rate of > sinusoids inside the frame. it is a consequence of this very old paper i > did for the IEEE WASPAA (Mohonk) in 2001: > https://www.researchgate.net/publication/3927319_Intraframe_time-scaling_of_nonstationary_sinusoids_within_the_phase_vocoder > > > drop me a note and i will send you this MATLAB code. i think it is > self-contained except for the FFT and polyfit() for fitting a straight line > to some data. > > translating that to C or C++ or C# or whatever is the flavor of the month > is another whole can o' worms. > > ---------------------------- Original Message ---------------------------- > Subject: Re: [music-dsp] phase vocoder > From: "Matt Ingalls" <m...@8dio.com> > Date: Mon, October 15, 2018 2:11 pm > To: music-dsp@music.columbia.edu > -------------------------------------------------------------------------- > > > well there’s this old blog from Stephan Bernsee using a “similar > process” to the phase vocoder > > for frequency domain pitch shifting: > > http://blogs.zynaptiq.com/bernsee/pitch-shifting-using-the-ft/ > > http://blogs.zynaptiq.com/bernsee/repo/smbPitchShift.cpp > > > > not sure what your goal is, but at least in my implementation, i wasn’t > able to get it to sound > > as good (fewer processing artifacts) as time domain solutions.. > > > > -m > > > > > >> On Oct 15, 2018, at 9:31 AM, Alex Dashevski <alexd...@gmail.com> wrote: > >> > >> I need the code for pitch shifting on RealTime. Could you help ? > >> > >> בתאריך יום ב׳, 15 באוק׳ 2018 ב-15:15 מאת Eder Souza < > ederwan...@gmail.com <mailto:ederwan...@gmail.com>>: > >> Some time ago I posted some code in matlab, this is not real-time, you > can see the basic math of an standard phase vocoder. > >> > >> > https://dsp.stackexchange.com/questions/40101/audio-time-stretching-without-pitch-shifting/40367#40367 > < > https://dsp.stackexchange.com/questions/40101/audio-time-stretching-without-pitch-shifting/40367#40367 > > > >> > >> This code just change the time, you can pitch shift using a combination > of the code above and resampler... > >> > >> The core code is the same for real-time or off-line, the only thing > that you need to worry about is how deal with input and output buffer (do > you need ensure output buffer continuity, learn about Circular Buffer). > >> > >> PS: Prepare to latency lol > >> > >> > >> Eder de Souza > >> ♪♫ ♫♪ > >> ▇ ▅ █ ▅ ▇ ▂ ▃ ▁ ▁ ▅ ▃ ▅ ▅ ▄ ▅ ▇ > >> Sent > From The Moon and Written With My Thumbs ! > >> > >> > >> On Sun, Oct 14, 2018 at 2:11 AM Alex Dashevski <alexd...@gmail.com > <mailto:alexd...@gmail.com>> wrote: > >> Hi, > >> Which library? > >> Thanks, > >> Alex > >> > >> On Sat, Oct 13, 2018, 22:42 he can jog <e...@hecanjog.com <mailto: > e...@hecanjog.com>> wrote: > >> The library is easy to work with. Having enough of a working knowledge > of phase vocoders to make use of an existing implementation and > implementing one from scratch are two different levels of complexity. > >> > >> On Sat, Oct 13, 2018 at 2:31 PM Daniel Varela < > danielvarela...@gmail.com <mailto:danielvarela...@gmail.com>> wrote: > >> Complex stuff have no easy fix > >> > >> El sáb., 13 oct. 2018 20:43, he can jog <e...@hecanjog.com <mailto: > e...@hecanjog.com>> escribió: > >> Paul Batchelor has a great port of the csound 'mincer' phase vocoder in > his SoundPipe library: > https://github.com/PaulBatchelor/Soundpipe/blob/master/modules/mincer.c < > https://github.com/PaulBatchelor/Soundpipe/blob/master/modules/mincer.c> > >> > >> That's definitely beyond my understanding to re-implement, but his > library is designed to be embedded and has a really nice API, I've found it > easy to work with in my own projects. > >> > >> On Sat, Oct 13, 2018 at 1:31 PM Alex Dashevski <alexd...@gmail.com > <mailto:alexd...@gmail.com>> wrote: > >> Hi, > >> > >> Where can I find a simple explanation and code example(supported > RealTime and multi threading) ? > >> I found https://breakfastquay.com/rubberband/index.html < > https://breakfastquay.com/rubberband/index.html> but it very difficult > undersand how it work, I need to integrate this code into android that > should run on an audio buffer. > >> > >> Thanks, > >> Alex > > > -- > > 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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