Listener
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Detect calls of attention in the surroundings
Listener can be used to listen to the surroundings and alert the user of the computer if speech / loud noises are detected.
This application contains implementations of two voice-activity-detection algorithms and provides notifications using Growl on computers using Mac OS X.
On machines without Growl installed, Listener writes human-readable output to /var/tmp/audio.log which can be used by tools like Geektool.
For more information visit: http://shriphani.com/blog/listener