18. The apparatus of claim 11 , wherein the means for classifying the portion at the second classifier as speech or as music comprises at least one of means for comparing the voicing of the portion to a first threshold, means for comparing the modified correlation to a second threshold, and means for comparing long term pitch gain to a third threshold.
18. The apparatus of claim 11 , wherein the means for classifying the portion at the second classifier as speech or as music comprises at least one of means for comparing the voicing of the portion to a first threshold, means for comparing the modified correlation to a second threshold, and means for comparing long term pitch gain to a third threshold. 19. The apparatus of claim 18 , 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.