Fast Fourier analyser

Bob Ord

I wrote this BASIC program about five years ago for use with AMPLE BCE. It may be of interest to those who use the waveform editing utility published in AMPLINEX 014.

The program allows you to draw the desired waveform and then takes it and performs a Fourier analysis upon it. Once the analysis is complete the screen clears and displays the amplitude and the phase angle of the first 16 harmonics of the drawn waveform.

When drawing the waveform use the whole grid to draw one complete cycle of your waveform.

The phase angle is not much use for the Music 5000 software but the amplitude value is, and should be taken as a percentage. It is easier to define a waveform using the WH! instruction than to define the 128 points needed to use the WG! instruction.

Full instructions for the keys used are given in the program.

Related file on this disc:

U.FFA - Fast Fourier analysis. BASIC program