Robust method of measurement of fundamental frequency by ACLOS: autocorrelation of log spectrum
Nobuyuki Kunieda, Tetsuya Shimamura, Jun Suzuki · 2002
Correct and robust measurement of fundamental frequency F/sub 0/ is requested in the analysis of speech sound, speech enhancement systems and analysis synthesis telephony employing F/sub 0/. This article proposes a new method to estimate F/sub 0/ utilizing the autocorrelation function of the log spectrum. This method is named ACLOS (autocorrelation of log spectrum). In this method, the fundamental frequency is estimated from the peak of the autocorrelation function along the frequency axis of the spectral pattern. It means that F/sub 0/ is measured by enhancing the periodic feature of harmonics on the spectrum. Experimental results indicate that ACLOS gives more robust and reasonable pitch information than other methods give.