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 s�b., 13 oct. 2018 20:43, he can jog <e...@hecanjog.com >> <mailto:e...@hecanjog.com>> escribi�: >> 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." � � � �
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