There are many ways to do real time pitch shift, which one is right for
you will depend on things like
- what flaws and artifacts you consider acceptable
- your use constraints: pitch shift range, granularity et c
- processor and memory constraints
- the engineering skills and capacity that you have at your disposal
There's a nice review of some fairly advanced techniques, including
WSOLA, here:
http://www.mdpi.com/2076-3417/6/2/57/pdf
It's a complex problem, so be prepared for complex solutions!
Martin
On 27/07/18 15:50, Alex Dashevski wrote:
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
<mailto: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
<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
<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
<mailto: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
<mailto:alexd...@gmail.com>>
*An:* music-dsp@music.columbia.edu
<mailto: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
<mailto: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
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