Analyzing audio with Fast Fourier Transform (FFT) windows

Unity is inherently built with the capability to analyze a playing audio source and determining the various output frequency signal levels. While the mathematics behind this are quite advanced, understanding the theory and background of how this all works will only benefit us later when we build an audio visualizer. Therefore, we are going to cover the theory on how audio can be analyzed for visualization. Starting in the next section, we will look at what comprises an audio signal.

Audio spectrum

Fourier's theorem states that all signals are the sum of sines. This is another way of saying that all audio signals are comprised of component sound waves, called sine...