Vocal-tract computation: How to make it robust and fast
Qiguang Lin · The Journal of the Acoustical Society of America · 1994
Numerical methods are described to speed up the frequency-domain calculation of the vocal-tract response and effectively determine the associated pole/zero patterns. These methods include algorithms to properly decompose the numerator and the denominator of the transfer function, to estimate formant patterns of a lossy vocal-tract system from its lossless counterpart by means of linear interpolation, to recover a heavily damped spectral peak by removing its neighboring formant from the true transfer function, and to utilize the information of residues at the system poles to ensure that no pole/zero is missed.