Alex, may i ask you where you are regarding development on the android?� you're coding in C++ or C (or is it C# or something)? are you at a place where you can make a simple "passthru" app where you can input samples from the ADC and output them to the DAC?� if you are there, can you make a simple delay line (you will need to do modulo arithmetic on the array indices, which is why i recommend making these delay line buffers a power of 2 in length and using the "&" operator to mask off bits, which might be more efficient than the "%" operator)?� have you done other things like a simple biquad filter or an FIR? because, to do this correctly, you will need to code up something like a pitch detector to implement the "WS" part of the algorithm.� it can be done, crudely, with maybe 20 or 30 lines of code, but that's where some things get difficult.� then you will have to implement a *sliding* delay on the previously mentioned delay buffer. if you're willing to publish the end-result code here or at Stack Exchange or some other public domain, i am willing to help you do this. if it's for profit, then we would have to talk about it directly and privately. bestest, -- r b-j� � � � � � � � � � � � �r...@audioimagination.com "Imagination is more important than knowledge." � ---------------------------- Original Message ---------------------------- Subject: Re: [music-dsp] WSOLA on Real Time From: "Alex Dashevski" <alexd...@gmail.com> Date: Fri, July 27, 2018 10:50 am To: music-dsp@music.columbia.edu m...@pingdynasty.com -------------------------------------------------------------------------- > Hi, > > a) I tried to understand the tarsosdsp code and read the theory about > WSOLA. The formulas difficult to understand. > b) My goal is change frequency the input of audio of android. > c) What is your right solution ? > > Thanks, > Alex > > 2018-07-27 17:37 GMT+03:00 Martin Klang <m...@pingdynasty.com>: > >> >> It helps if you let us know a) what you've tried and researched already, >> b) what you plan to use it for, and c) why you think WSOLA is the right >> solution. >> >> WSOLA doesn't have a 'simple explanation and implementation', but if what >> you want is just some code that does the job and lets you worry about other >> things then how about: >> https://stackoverflow.com/questions/37386410/realtime- >> pitch-shifting-using-tarsosdsp-on-android >> >> And since you've already asked this question on the TarsosDSP forum I'm >> surprised you've not seen that. >> >> Oh look, here's a time stretch example: >> https://github.com/JorenSix/TarsosDSP/blob/master/src/ >> examples/be/tarsos/dsp/example/TimeStretch.java >> >> best, >> >> Martin let-me-google-that-for-you Klang >> >> >> >> On 27/07/18 11:47, Alex Dashevski wrote: >> >> Hi, >> All materials and code that I found on google and GitHub have not real >> time implementation(that means, signal is known in advance) >> I understand that in this case, I need to do resampling before and after. >> >> Thanks, >> Alex >> >> 2018-07-26 3:22 GMT+03:00 <rolfsassin...@web.de>: >> >>> Not everbody reads mails every day so it might be an idea to wait for >>> replies before pushing. >>> >>> I am not an expert on this subject but my company is so I would put it >>> this way: >>> >>> 1) To my mind, there is no simpler explanation than given in the Wiki. At >>> least this is an entrypoint to start reading. More comprehensive material >>> can be found in several DSP literature but they might not be easy since the >>> subject is not easy. >>> >>> 2) There is not only on "WSOLA" implementation. It is all about details >>> and requirements. What in detail do you want to do? >>> >>> 3) Even, if people have code ready fpr your app, they cannot give it way >>> that easily because it might be covered by their company. Me i am not allow >>> to post code at all. >>> >>> I suggest you search the github projects for code coming close to your >>> needs? >>> >>> Rolf >>> >>> *Gesendet:* Mittwoch, 25. Juli 2018 um 20:41 Uhr >>> *Von:* "Alex Dashevski" <alexd...@gmail.com> >>> *An:* music-dsp@music.columbia.edu >>> *Betreff:* Re: [music-dsp] WSOLA on Real Time >>> Hi, >>> Could you help ? >>> >>> 2018-07-24 9:18 GMT+03:00 Alex Dashevski <alexd...@gmail.com>: >>>> >>>> Hi. >>>> >>>> I'm looking for a simple explanation and implementation of WSOLA. I >>>> tried to google it but I can't understand all meaning of inputs and outputs >>>> that WSOLA has. >>>> My goal is to implement it in Real time on Android. Possibly, to use >>>> pitch shifting in Real Time. >>>> >>>> Thanks, >>>> Alex >>>> >>> _______________________________________________ dupswapdrop: music-dsp >>> mailing list music-dsp@music.columbia.edu https://lists.columbia.edu/mai >>> lman/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 >> listmusic-dsp@music.columbia.eduhttps://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 � � � � � � -- r b-j� � � � � � � � � � � � �r...@audioimagination.com "Imagination is more important than knowledge."
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