jinak tady jsou programove rutiny - http://webcache.googleusercontent.com/search?q=cac he:7QMRaFR6LjsJ:en.literateprograms.org/Cooley-Tuk ey_FFT_algorithm_(C)+FFT+p%C5%99%C3%ADklad+cooley& cd=5&hl=cs&ct=cln k&gl=cz