Hello Alex, The period is 1 / frequency. I think what was confusing is you said that the pitch was 5 milliseconds. Pitch is normally described either in Hertz or in semitones.
Also the buffer size that you are referring to is a single buffer used for reading or writing the audio data. That is not the total size of the sample. The buffer size use for reading and writing should not affect the signal processing algorithm because you are basically processing one sample at a time anyway. You can collect the samples into blocks of data if you need to. but that is independent of the input output buffer size. Most smart phones including Android should be fast enough to implement this algorithm. It should be possible. You might want to start with just reading a WAV file in, processing the data, then writing a WAV file out. Separate the reading and writing of the file from the processing algorithm. Then when you have it working you can just port it to Android. If you have Android specific questions about the Android APIs then please use the Android mailing list. If you have mathematical questions about DSP then this is a better mailing list. Phil Burk On Sun, May 27, 2018, 6:27 AM Alex Dashevski <alexd...@gmail.com> wrote: > Hi, > I mean that fundamental frequency is between 50Hz and 4"50Hz. Right? > Why period of pitct isn't equal to 1/fundamental frequency? > > what is about of subsampling? That means that proccessing will be done > with 8Kh. > > what is about pitch shifting? > > How can I prove to my instractor that I can't implementation wsola? > > I have already asked this question on ndk android group but they refer me > to this forum. > > Thanks, > Alex > > > On Sun, May 27, 2018, 02:51 robert bristow-johnson < > r...@audioimagination.com> wrote: > >> On 5/25/18 2:06 PM, Alex Dashevski wrote: >> > >> > I want to implement WSOLA on Real Time. >> > The pitch is between 5ms and 20ms. >> do you mean the *period* is between 5 ms and 20 ms? or that the >> fundamental frequency is between 50 Hz and 200 Hz? this appears to be a >> bass instrument >> >> > Frequency samples of the system is 48Khz >> > Buffer size has 240 sample. >> >> that's not long enough. you will never be able to even do the necessary >> pitch detection with a buffer that small. (unless you mean the >> input/output buffer of the android, then that is plenty long.) >> >> > I want to implement it on android. >> >> then you should have no problem securing a megabyte of memory. >> >> > My issue is that my buffer is smaller than pitch, >> >> it's the *period*. pitch is not measured in ms. >> >> > I can't understand how I can implement WSOLA. >> >> you can't unless you can allocate more memory. that's a programming >> issue with the android. >> >> >> >> -- >> >> 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
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