[music-dsp] WSOLA on Real Time

Discussion:

Alex Dashevski

2018-07-24 06:18:49 UTC

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

Alex Dashevski

2018-07-25 18:41:14 UTC

Permalink

Hi,
Could you help ?

Post by Alex Dashevski
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

r***@web.de

2018-07-26 00:22:51 UTC

Permalink

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music-***@music.columbia.edu
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Alex Dashevski

2018-07-27 10:47:32 UTC

Permalink

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

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
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
*Betreff:* Re: [music-dsp] WSOLA on Real Time
Hi,
Could you help ?

_______________________________________________ dupswapdrop: music-dsp
mailman/listinfo/music-dsp
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Martin Klang

2018-07-27 14:37:42 UTC

Permalink

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

Post by Alex Dashevski
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
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
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:*Â Mittwoch, 25. Juli 2018 um 20:41 Uhr
*Betreff:*Â Re: [music-dsp] WSOLA on Real Time
Hi,
Could you help ?
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 shiftingÂ in Real Time.
Thanks,
Alex
https://lists.columbia.edu/mailman/listinfo/music-dsp
<https://lists.columbia.edu/mailman/listinfo/music-dsp>
_______________________________________________
dupswapdrop: music-dsp mailing list
https://lists.columbia.edu/mailman/listinfo/music-dsp
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_______________________________________________
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Alex Dashevski

2018-07-27 14:50:01 UTC

Permalink

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

Post by Martin Klang
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
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.
https://github.com/JorenSix/TarsosDSP/blob/master/src/
examples/be/tarsos/dsp/example/TimeStretch.java
best,
Martin let-me-google-that-for-you Klang
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

Post by Alex Dashevski
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
lman/listinfo/music-dsp
_______________________________________________
dupswapdrop: music-dsp mailing list
https://lists.columbia.edu/mailman/listinfo/music-dsp

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Martin Klang

2018-07-27 15:32:27 UTC

Permalink

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

Post by Alex Dashevski
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
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
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.
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

Post by Alex Dashevski
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
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
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:*Â Mittwoch, 25. Juli 2018 um 20:41 Uhr
*Betreff:*Â Re: [music-dsp] WSOLA on Real Time
Hi,
Could you help ?
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 shiftingÂ in Real Time.
Thanks,
Alex
https://lists.columbia.edu/mailman/listinfo/music-dsp
<https://lists.columbia.edu/mailman/listinfo/music-dsp>
_______________________________________________
dupswapdrop: music-dsp mailing list
https://lists.columbia.edu/mailman/listinfo/music-dsp
<https://lists.columbia.edu/mailman/listinfo/music-dsp>
_______________________________________________
dupswapdrop: music-dsp mailing list
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<https://lists.columbia.edu/mailman/listinfo/music-dsp>

_______________________________________________
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robert bristow-johnson

2018-07-27 20:16:17 UTC

Permalink

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 ***@audioimagination.com

"Imagination is more important than knowledge."

---------------------------- Original Message ----------------------------

Subject: Re: [music-dsp] WSOLA on Real Time

From: "Alex Dashevski" <***@gmail.com>

Date: Fri, July 27, 2018 10:50 am

To: music-***@music.columbia.edu

***@pingdynasty.com

--------------------------------------------------------------------------

Post by Alex Dashevski
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
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_______________________________________________
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--

r b-j ***@audioimagination.com

"Imagination is more important than knowledge."

Alex Dashevski

2018-07-27 21:02:22 UTC

Permalink

Hi.

It's for school project. My project is based on open source code from
google examples:
https://github.com/googlesamples/android-ndk/tree/master/audio-echo
I need to add to this code the WSOLA. That means, implement Filters, and
algorithm. I have already filter but I am not sure if it's good.
I understood that I also need to do resampling for real time because of
detection a pitch.
I also can use pitch shifting but I can't understand if it instead of using
the WSOLA ?

Thanks,
Alex

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,
--
"Imagination is more important than knowledge."
---------------------------- Original Message ----------------------------
Subject: Re: [music-dsp] WSOLA on Real Time
Date: Fri, July 27, 2018 10:50 am
--------------------------------------------------------------------------

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