An alternative to the Mel-Frequency Cepstral Coefficients is the use of Perceptual Linear Prediction (PLP) coefficients.
As implemented in HTK the PLP feature extraction is based on the standard mel-frequency filterbank (possibly warped). The mel filterbank coefficients are weighted by an equal-loudness curve and then compressed by taking the cubic root.5.5 From the resulting auditory spectrum LP coefficients are estimated which are then converted to cepstral coefficients in the normal way (see above).