Speed Change without Pitch Change

Does anyone know of a C/C++ library for taking an audio file and
performing a speed change without changing the pitch?

Thanks,

Jeff Dodson

> Does anyone know of a C/C++ library for taking an audio file and
> performing a speed change without changing the pitch?
> 

Jeff,

The simple way to do it is just to repeat or cut out the small chunks of 
data depending if you are going faster or slower respectively. Divide 
your file into the frames of ~10ms long and operate frame by frame.
A better way for doing the speed change is the same method however the 
signal is split into frq. subbands and each subband is processed separately.

Vladimir Vassilevsky

DSP and Mixed Signal Design Consultant

http://www.abvolt.com

jeffdod wrote:

> Does anyone know of a C/C++ library for taking an audio file and
> performing a speed change without changing the pitch?
> 
> Thanks,
> 
> Jeff Dodson

libsoundtouch (C++) springs to mind as one option, but there are others. 

Regards, Dan.

jeffdod wrote:
> Does anyone know of a C/C++ library for taking an audio file and
> performing a speed change without changing the pitch?
> 
> Thanks,
> 
> Jeff Dodson

Look on http://www.dspdimension.com/

Jerry
-- 
Engineering is the art of making what you want from things you can get.
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