Sound Analysis in Processing

How to display registered peaks and tracked frequency bands from various audio inputs

This post is supposed to be a round-up for various aspects of signal analysis from inside Processing sketches or Java projects. The collected links and resources are showcasing different approaches and strategies to display amplitudes of prevailing frequency ranges and bands as well as singal peaks for beat detection.

Feel free to complete the list below or to post own projects and examples.

Related processing work and projetcs

• Magnetic structure w/audio pt. 1 / pt. 2, by Robert Hodgin (also check his Processing set at Flickr)
• BeatDetect - Processing object for use with the Ess sound library
• LogarithmicAverages by the use of the Mimin library

Research/Theory

• Beat Detection discourse at Processing.org
• ESS’s FFT averages - source: discourse at Processing.org
• Beat detection, revisited - blogged by Robert Hodgin
• FFT Averages, by Damien Di Fede
• Beat Detection Algorithms at GameDev.net

Example code/live applets

• beat_zone, by Aaron Steed
• spectrum_live, by Damien Di Fede
• LinLogAverages (example code for the Minim Library) more Minim examples / manual
• HalfOctaveVUDemo, by Dave Bollinger

Sound Libraries for Processing

• Mimin, by Damien Di Fede
• Ess, by Krister Olsson

Image source: Beat detection, revisited by Robert Hodgin, 2007