8th Annual Conference of the International Speech Communication Association

Antwerp, Belgium
August 27-31, 2007

An Empirical Investigation of the Nonuniqueness in the Acoustic-to-Articulatory Mapping

Chao Qin, Miguel Á. Carreira-Perpiñán

Oregon Health & Science University, USA

Articulatory inversion is the problem of recovering the sequence of vocal tract shapes that produce a given acoustic speech signal. Traditionally, its difficulty has been attributed to nonuniqueness of the inverse mapping, where different vocal tract shapes can produce the same acoustics. However, evidence for the nonuniqueness has been restricted to theoretical studies, or to data from atypical speech or very specific sounds. We present a systematic large-scale study using articulatory data for normal speech from the Wisconsin XRDB. We find that nonuniqueness does exist for some sounds, but that the majority of normal speech is produced with a unique vocal tract shape.

Full Paper

Bibliographic reference.  Qin, Chao / Carreira-Perpiñán, Miguel Á. (2007): "An empirical investigation of the nonuniqueness in the acoustic-to-articulatory mapping", In INTERSPEECH-2007, 74-77.