The method 8, wherein the calculating {TAIL ~ a power spectral density} of {HEAD ~ the speech signal} using the estimated autocorrelation function comprises: 
The method 8 , wherein the calculating { TAIL ~ a power spectral density } of { HEAD ~ the speech signal } using the estimated autocorrelation function comprises :
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH