play it faster?
what are you trying to do this with?
are you talking about pitch-scaling or resampling?
try http://www.dspdimension.com
or http://www.mega-nerd.com
for useful resources on each

/chris

Lars Tegborg wrote:
> 
> Hi
> 
> Does anyone know how to pitch up sound to double frequency in realtime.
> 100Hz pitch to 200Hz and 400Hz pitch to 800Hz.
> 
> Thanks

Hi

Does anyone know how to pitch up sound to double frequency in realtime.
100Hz pitch to 200Hz and 400Hz pitch to 800Hz.

Thanks