Statistical approach to vocal tract transfer function estimation based on factor analyzed trajectory HMM

In this paper, we describe a novel statistical approach to the vocal tract transfer function (VTTF) estimation of a speech signal based on a factor analyzed trajectory hidden Markov model (HMM). Because speech is a quasi-periodic signal, there are many missing frequency components between adjacent F0 harmonics. The proposed method determines a time-varying VTTF sequence based on the maximum a posteriori (MAP) estimation considering not only harmonic components observed at each analyzed frame but also those at other frames for stochastically interpolating the missing frequency parts.

• Type: Conference
• Year: 2008
• Where: ICASSP
• Authors: Tomoki Toda, Keiichi Tokuda
• Keywords: Factor Analyzed Trajectory, Hidden Markov Model, ICASSP 2008, Signal Processing, Vocal Tract Transfer