28. The computer-readable medium of claim 21 , wherein classifying the portion at the second classifier as speech or as music comprises at least one of comparing the voicing of the portion to a first threshold, comparing the modified correlation to a second threshold, or comparing long term pitch gain to a third threshold.
28. The computer-readable medium of claim 21 , wherein classifying the portion at the second classifier as speech or as music comprises at least one of comparing the voicing of the portion to a first threshold, comparing the modified correlation to a second threshold, or comparing long term pitch gain to a third threshold. 29. The computer-readable medium of claim 28 , wherein the voicing ranges from 0, corresponding to no correlation with speech, to 1, corresponding to high correlation with speech; wherein the modified correlation ranges from 0, corresponding to random noise, to 1, corresponding to highly structured sound; wherein the long term pitch gain is the normalized cross-correlation between the past excitation and the current prediction residual; and wherein the long term pitch gain ranges from 0, indicating that the error in the past portion is not adequate in representing the current portion, to 1, indicating that using the residual error in the past portion can completely represent the current portion.