Third International Conference on Spoken Language Processing (ICSLP 94)

Yokohama, Japan
September 18-22, 1994

Improving the Kelly-Lochbaum Vocal Tract Model Using Conical Tube Sections and Fractional Delay Filtering Techniques

Vesa Välimäki, Matti Karjalainen

Helsinki University of Technology, Acoustics Laboratory, Espoo, Finland

An articulatory model of speech production is usually constructed by approximating the profile of the vocal tract using cylindrical tube sections. This is implemented by a digital ladder filter that is called the Kelly-Lochbaum model. In this paper we propose an extended approach, where the tube sections approximating the profile of the tract are conical instead of cylindrical. Furthermore, the length of each tube section in our model can be accurately controlled using a novel fractional delay filtering scheme. These refinements result in an accurate and intuitively controllable vocal tract model that is well suited for articulatory speech synthesis.

Full Paper

Bibliographic reference.  Välimäki, Vesa / Karjalainen, Matti (1994): "Improving the kelly-lochbaum vocal tract model using conical tube sections and fractional delay filtering techniques", In ICSLP-1994, 615-618.