Audio Analysis by R. Luke DuBois. Analyzes a sound file using a Fast Fourier Transform, and plots both the current spectral frame and a "peak-hold" plot of the maximum over time using logarithmic scaling. Based on examples by Krister Olsson This example requires the Ess library. Download from this address and then follow the installation instructions: http://www.tree-axis.com/Ess/

Source code: AudioAnalysis

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