I wrote a spectral analysis library called udsp: http://www.eliteraspberries.com/doc/udsp-user-guide.html http://www.eliteraspberries.com/doc/udsp-user-guide.h

I wrote a spectral analysis library called udsp: http://www.eliteraspberries.com/doc/udsp-user-guide.html http://www.eliteraspberries.com/doc/udsp-user-guide.html https://code.google.com/p/udsp/ https://code.google.com/p/udsp/ In the future it will include: * support for more FFT libraries, like FFTW; * some signals processing functions, such as basic frequency modulation/demodulation; and * a NumPy-compatible Python interface. Its best feature at the moment is convolution and correlation.