FFTW with C++

[dacoolest]

Hi, my ultimate goal is to extract all the sound information that is below 15KHz from a mono wave file. The program loads samples into memory and its represented as 16bit signed integer array.

I used FFTW and it has several functions such as complex multidimensional fft, real multidimensional fft, real one dimension fft, complex one dimension fft.

what method should I be using for this?

Thanks.

[Disch]

Didn't you make another thread just like this already?
http://cplusplus.com/forum/general/72002/

No need to start another thread about the same thing.