This is a MATLAB toolbox for computing acoustic contrast scores using either the contour transform (requires adding the acontour repository to your MATLAB path) or the derivative of the amplitude envelope. To install simply add the base and "helpers" directory to your MATLAB path. To verify the installation run the demo script, you should see the following output: 
Parameters are passed as parameter/value pairs (see demo script for example).
This has been tested with MATLAB R2012b running on Max OS X 10.9. Toolbox requirements: Image Processing Toolbox, Signal Processing Toolbox, Parallel Processing Toolbox.