Fast Fourier transform

A Fourier Transform function analyzes a wave form into its constituant simple sine waves. A Fast Fourier transform does this tedious mathematical feat, by sampling the wave form recorded over a few seconds, a given number of times (say 500).

The wave form and the FFT showing the two frequencies that make up the beat

The figure is from an extended essay Resonance in Cups by Xin Yi Yeap, that is in the Essays Index.

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