8.1 Math background. When we take the FT of data we get back estimates of the amplitude and phase of each frequency component comprising the data.
Lets do an example.
You must use a number of data points that is a multiple of 2, ie 2,4,8,16,32,64,128 etc. The FT program requires this. Then make a plot of the spectrum and versus frequency. The frequency scale must be calculated as follows.