﻿FFTdemo Help  Version 1.0

The program shows some basic operations with  FFT, Fast Fourier Transform, calculations which is a mathematical transformation of signals in the time domain to signals in the frequency domain.
The FFT is mainly used in frequency analysis, vibration analysis, audio systems, spectrum analysers etc.

This program can use either the Transform/Inverse or the Transform2/Inverse2 method pair.
You can set the <Transform> variable to <0> or to <2> in the setup Panel.
	<0> for Transform/Inverse  and <2> for Transform2/Inverse2.

A pure sine wave in the time domain is represented by ONE spectral line in the frequency domain.

Examples:
	<1 sin>	calculates 1 pure sine wave with one period over the time window, which gives just one line at index 1 in the frequency domain.

	<3 sin>	calculates 3 pure sine waves with 1,  25  and 100 periods over the time window, which gives 3 spectral lines at index 1,  25 and 100 in the frequency domain.

You can calculate different time signals composed of sines or cosines, predefined and user defined, calculate the FFT and Inverse FFT and display the values of the samples in a list and in graphics.
