An improved correction formula for the estimation of voice source harmonic magnitudes

Information about voice and talker characteristics, or voice quality, can be gained from glottal flow estimates. Many voice quality parameters, such as the open quotient (OQ), depend on an accurate estimate of the glottal flow (voice source) spectrum. It is known that OQ, for example, is correlated with the magnitude difference of the first two harmonics (H1–H2) of the voice source spectrum [Holmberg et al., ‘‘Comparisons among aerodynamic, electroglottographic, and acoustic spectral measures of female voice,’’ J. Speech Hear. Res. 38, 1212−1223 (1995)]. To obtain an accurate estimate of the voice source spectral harmonics, the influence of vocal−tract resonances needs to be removed. In Hanson, Ph.D. dissertation, Harvard University (1995), a correction formula which removes the effect of F1 on H1 and H2 was presented. In this work, an improved correction formula for the estimation of source harmonics′ magnitudes is presented. The new correction formula accounts for the bandwidths of vocal−tract resonance...