If you're in the market for a computer-based audio analysis system, then you'll want to check out MATAA (Mat's Audio Analyzer), which is distributed as free software under the GNU General Public License. MATAA works with your computer's soundcard and doesn't require any proprietary hardware or a specific computer platform.
The program runs under the MATLAB or GNU Octave high-level computational programming languages and can be easily customized and adapted to specific needs. It comes with scripts for conducting typical analyses and tests, but can be extended and customized to allow analysis of anything that can be tested using audio test signals.
MATAA screenshot. (Click for full view.)
An article describing MATAA in detail recently appeared in AudioXpress. The author has made available the original version of the MATAA article, where the coding examples are easier to read.
The program currently supports sound input and output on the MAC OS X and Windows, with support for Linux presumably forthcoming. Anyone using the program or wanting to suggest an application can contact the author through the MATAA homepage.
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