Hi, The current code has problem. if I send you the current code, can you help me with implementation ? Are you familiar with android ?
Thanks, Alex 2018-09-27 20:30 GMT+03:00 Spencer Jackson <ssjackso...@gmail.com>: > Alex: > > Any algorithm with a deterministic computation time can be applied in > real-time if latency is sufficient enough. Are you familiar with the idea > of copying the stream to a buffer then applying the algorithm and > outputting the older data which the algorithm has already been applied to? > Adding latency like this and processing in blocks is the standard method > that allows very cpu heavy processing to be applied to a real-time stream. > The only real requirement for real-time processes is to output the same > number of samples as the input (at the same sample rate). > > Pitch shifting methods stretch or shrink the signal creating more or less > samples and you must figure out how to remove the extra or add samples to > be the correct number of samples in order for it to work on a real-time > audio stream. This is the resampling part and there are many ways to > address it. > > I think we might be able to help more if you can ask more specific > questions about the implementation details you are struggling with. > > _Spencer > > On Thu, Sep 27, 2018 at 12:16 AM Alex Dashevski <alexd...@gmail.com> > wrote: > >> Hi Robert, >> >> I don't understand your last sentence: >> "then, in real-time, you can use the time >> scaler make the more or fewer samples per block to be the same as >> normal." >> >> In the beginning of your answer, you said that I need to use WSOLA with >> resampling. >> >> I have problem with implementation. Can you help ? >> >> Thanks, >> Alex >> >> 2018-09-27 0:25 GMT+03:00 Jacob Penn <penn.ja...@gmail.com>: >> >>> Ahh yeah I gotcha, >>> >>> Yes, in the case of slow down, there Is a finite amount you’re able to >>> slow down based on the size of the circular buffer of input data in use. >>> >>> In my personal applications I offer users the ability to restart the >>> stretch from the writehead at a musical value. Conveniently the slowest >>> rate for this control will stop the overflow ; ) >>> >>> Can sound quite nice! >>> >>> Best, >>> >>> [image: insignia] <http://jakemumu.github.io/> >>> JACOB PENN.MUMUKSHU >>> 612.388.5992 >>> >>> On September 26, 2018 at 2:21:29 PM, robert bristow-johnson ( >>> r...@audioimagination.com) wrote: >>> >>> >>> >>> ---------------------------- Original Message >>> ---------------------------- >>> Subject: Re: [music-dsp] WSOLA on RealTime >>> From: "Jacob Penn" <penn.ja...@gmail.com> >>> Date: Wed, September 26, 2018 5:00 pm >>> To: r...@audioimagination.com >>> music-dsp@music.columbia.edu >>> ------------------------------------------------------------ >>> -------------- >>> >>> > You can indeed do it on real time audio but the tricks is like the >>> previous >>> > email, you’ll need to devise strategies for pitching things up, as >>> you’ll >>> > be lacking the necessary information to move faster across the buffer >>> from >>> > the write head position. >>> > >>> > You’ll also obviously only be able to slow down a signal, and not >>> speed it >>> > up. >>> >>> no, even if you slow it down, any finite-sized buffer will eventually >>> overflow. i presume you mean time-scaling (not pitch shifting) using WSOLA. >>> >>> by "real-time", i mean live samples going in and (assuming no sample >>> rate conversion) the same number of samples going out in a given period of >>> time. with an upper bound of delay (and the lower bound is imposed by >>> causality) and the process can run indefinitely. so if you're slowing down >>> audio in real-time and you're running this process for a day. or for a >>> year. >>> >>> >>> -- >>> >>> 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 >>> >>> >>> _______________________________________________ >>> 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 >
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