Robust method of measurement of fundamental frequency by ACLOS: autocorrelation of log spectrum

Correct and robust measurement of fundamental frequency F₀ is requested in the analysis of speech sound, speech enhancement systems and analysis synthesis telephony employing F₀. This article proposes a new method to estimate F₀ 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 F₀ 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