Transformada rápida de Fourier

A procura de um programa que realize a transformada rápida de Fourier do sinal proveniente da placa de som.

FFTExplorer

FFTExplorer is an advanced, Java-based signal processing workshop meant to introduce a number of advanced and interesting electronic processing methods.

Site Oficial: http://www.arachnoid.com/FFTExplorer/

fft-spectra

The program fft-spectra is a tool for visualization of frequency spectra of an audio signal. What is it good for? You can use the program to

- see if you can sing and whistle in tune.
- verify that you can trust your ear and that your guitar is tuned well.
- satisfy your curiousity about physics of music ;-)

Site oficial: http://fft-spectra.sourceforge.net/