is it phase vocoder ? I can't understand how it work. בתאריך שבת, 6 באוק׳ 2018 ב-23:15 מאת Scott Cotton <w...@iri-labs.com >:
> sorry, dropped a phrase by accident: shouldn't be too hard -- to use --. > > On Sat, 6 Oct 2018 at 22:14, Scott Cotton <w...@iri-labs.com> wrote: > >> The best open source one I know of is >> https://breakfastquay.com/rubberband/ >> >> It is however very dense. I wouldn't bet on coming to an understanding >> of how it does sample/window framing without significant investment. The >> author himself said it was very hard to get sample accurate input samples >> to output samples ratios. >> >> However, to use it shouldn't be too hard. >> >> Scott >> >> On Sat, 6 Oct 2018 at 20:53, Alex Dashevski <alexd...@gmail.com> wrote: >> >>> Could you know where I can find phase vocoder implementaion in cpp thus >>> I can run it on real time ? >>> >>> בתאריך שבת, 6 באוק׳ 2018 ב-21:21 מאת Daniel Varela < >>> danielvarela...@gmail.com>: >>> >>>> For real time you will need to do windowing and overlap add. But yeah, >>>> 5ms should be enough. >>>> >>>> This is a high level explanation with MATLAB >>>> >>>> >>>> https://se.mathworks.com/help/audio/examples/pitch-shifting-and-time-dilation-using-a-phase-vocoder-in-matlab.html >>>> >>>> El sáb., 6 oct. 2018 20:10, Alex Dashevski <alexd...@gmail.com> >>>> escribió: >>>> >>>>> Can you tell what minimum duration of buffer ? 5ms should be Ok ? >>>>> >>>>> בתאריך שבת, 6 באוק׳ 2018 ב-21:06 מאת Daniel Varela < >>>>> danielvarela...@gmail.com>: >>>>> >>>>>> You can process buffers as small as your fft allows. >>>>>> >>>>>> El 6 oct. 2018 20:03, "Alex Dashevski" <alexd...@gmail.com> escribió: >>>>>> >>>>>> Hi, >>>>>> phase vocoder doesn't have restriction of duration ? >>>>>> Thanks, >>>>>> Alex >>>>>> >>>>>> בתאריך שבת, 6 באוק׳ 2018 ב-20:55 מאת Daniel Varela < >>>>>> danielvarela...@gmail.com>: >>>>>> >>>>>>> You could try a phase vocoder instead of WSOLA for time stretching. >>>>>>> Latency would be the size of the fft block. >>>>>>> >>>>>>> El sáb., 6 oct. 2018 19:49, gm <g...@voxangelica.net> escribió: >>>>>>> >>>>>>>> >>>>>>>> right >>>>>>>> >>>>>>>> the latency required is that you need to store the complete >>>>>>>> wavecycle, or two of them, to compare them >>>>>>>> >>>>>>>> (My method works a little bit different, so I only need one >>>>>>>> wavecycle.) >>>>>>>> >>>>>>>> So you always have this latency, regardless what sample rate you >>>>>>>> use. >>>>>>>> >>>>>>>> But maybe you dont need 20 Hz, for speech for instance I think that >>>>>>>> 100 or even 150 Hz is sufficient? I dont know >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> Am 06.10.2018 um 19:34 schrieb Alex Dashevski: >>>>>>>> >>>>>>>> If I understand correctly, resampling will not help. Right ? >>>>>>>> No other technique that will help. Right ? >>>>>>>> What do you mean "but not the duration/latency required" ? >>>>>>>> >>>>>>>> b href="mailto:g...@voxangelica.net"; moz-do-not-send="true"> >>>>>>>> g...@voxangelica.netb >>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> Am 06.10.2018 um 19:07 schrieb Alex Dashevski: >>>>>>>>> > What do you mean "replay" ? duplicate buffer ? >>>>>>>>> >>>>>>>>> I mean to just read the buffer for the output. >>>>>>>>> So in my example you play back 10 ms audio (windowed of course), >>>>>>>>> then >>>>>>>>> you move your read pointer and play >>>>>>>>> that audio back again, and so on, untill the next "slice" or >>>>>>>>> "grain" or >>>>>>>>> "snippet" of audio is played back. >>>>>>>>> >>>>>>>>> > I have the opposite problem. My original buffer size doesn't >>>>>>>>> contain >>>>>>>>> > full cycle of the pitch. >>>>>>>>> >>>>>>>>> then your pitch is too low or your buffer too small - there is no >>>>>>>>> way >>>>>>>>> around this, it's physics / causality. >>>>>>>>> You can decrease the number of samples of the buffer with a lower >>>>>>>>> sample >>>>>>>>> rate, >>>>>>>>> but not the duration/latency required. >>>>>>>>> >>>>>>>>> > How can I succeed to shift pitch ? >>>>>>>>> >>>>>>>>> You wrote you can have a latency of < 100ms, but 100ms should be >>>>>>>>> sufficient for this. >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> _______________________________________________ >>>>>>>>> dupswapdrop: music-dsp mailing list >>>>>>>>> music-dsp@music.columbia.edu >>>>>>>>> https://lists.columbia.edu/mailman/listinfo/music-dsp >>>>>>>>> >>>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> dupswapdrop: music-dsp mailing list >>>>>>>> music-dsp@music.columbia.edu >>>>>>>> https://lists.columbia.edu/mailman/listinfo/music-dsp >>>>>>> >>>>>>> _______________________________________________ >>>>>>> dupswapdrop: music-dsp mailing list >>>>>>> music-dsp@music.columbia.edu >>>>>>> https://lists.columbia.edu/mailman/listinfo/music-dsp >>>>>> >>>>>> >>>>>> _______________________________________________ >>> dupswapdrop: music-dsp mailing list >>> music-dsp@music.columbia.edu >>> https://lists.columbia.edu/mailman/listinfo/music-dsp >> >> >> >> -- >> Scott Cotton >> http://www.iri-labs.com >> >> >> > > -- > Scott Cotton > http://www.iri-labs.com > > > _______________________________________________ > dupswapdrop: music-dsp mailing list > music-dsp@music.columbia.edu > https://lists.columbia.edu/mailman/listinfo/music-dsp
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