Java de FFT (FFT by Java) This applet executes FFT (Fast Foureir Transformation). Let's click "Show Spectrum" button!! You can make some modification on the text box, then click "Read Wave" to do it for new series of data. The number of data is up to 512. You can visit this page and generate new data, then copy and paste it!! If this applet looks something weird, please reload it.