Frequency Warped All-pole Modeling of Vowel Spectra: Dependence on Voice and Vowel Quality

We address the problem of compactly representing the discrete spectral amplitudes of vowel sounds produced by a sinusoidal model. A study of frequency warped all pole model representation of spectral amplitudes has been presented. It has been generally accepted that incorporating Bark scale frequency warping in the all-pole modeling improves the perceived accuracy of the modeled sound. However our study suggests that whether such frequency warped all-pole modeling would improve the modeling accuracy depends on the nature of the vowel as well as the voice. We propose an alternative warping function which may be used to improve the modeling accuracy more universally.