I've never used the matlab dsp toolkit, so what do I know..<BR><BR>Anyway, you might check out if octave-forge has something suitable (it's on sourceforge iirc). Or then scilab might have ...

GNU Octave 4 [1] with its graphical interface is allowing many more folks to explore the MATLAB [2] programming language who never could have done so before because of the cost. While Octave will ...

If you don’t like Octave, you might try Scilab, another Linux package that is similar. There’s also Freemat, Sage, and Spyder. Of course, you can also run MATLAB under Linux.

Octave analysis is performed with a bank of parallel bandpass filters. The output of each filter then is averaged to compute the power in each band and displayed as a bar graph.