In search of non-uniqueness in the acoustic-to-articulatory mapping
G. Ananthakrishnan, Daniel Neiberg, Olov Engwall · 2009
This paper explores the possibility and extent of non-uniqueness in the acoustic-to-articulatory inversion of speech, from a statistical point of view. It proposes a technique to estimate the non-uniqueness, based on finding peaks in the conditional probability function of the articulatory space. The paper corroborates the existence of non-uniqueness in a statistical sense, especially in stop consonants, nasals and fricatives. The relationship between the importance of the articulator position and nonuniqueness at each instance is also explored. Index Terms: acoustic-to-articulatory inversion, nonuniqueness, gaussian mixture modeling.