Based on the physiology and pathology of vocal phonation, the oral speech, glottal volume velocity waveforms obtained by two-pass method for glottal inverse filtering analysis, and voice signals transmitted from the skin above thyroid were separated into harmonic and noise signals using independent component analysis (ICA). And furthermore,the harmonic-to-noise ratios were estimated and compared with the results obtained by conventional methods in the cases of different vowels, phonation types and several t...
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