http://projects.scipy.org/scikits/browser/trunk/talkbox/scikits/talkbox/lpc/lpc.py?rev=1306 http://www.mathworks.com/help/signal/ug/formant-estimation-with-lpc-coefficients.html http://en.wikipedia.org/wiki/Window_function#Hamming_window http://docs.scipy.org/doc/numpy/reference/generated/numpy.argsort.html