The system updates an autocorrelation function of the audio signal from samples in the audio signal, estimates {HEAD ~ an autocorrelation function} of the speech signal from the updated autocorrelation function of the audio signal, and calculates {TAIL ~ a power spectral density} of the speech signal using the estimated autocorrelation function 
The system updates an autocorrelation function of the audio signal from samples in the audio signal , estimates { HEAD ~ an autocorrelation function } of the speech signal from the updated autocorrelation function of the audio signal , and calculates { TAIL ~ a power spectral density } of the speech signal using the estimated autocorrelation function
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH