Second International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications (MAVEBA 2001)

Florence, Italy
September 13-15, 2001

A Method for Measurement of the Vocal Tract Mouth Impedance

Malte Kob (1), Christiane Neuschaefer-Rube (2)

(1) Institute of Technical Acoustics; (2) Phoniatric and Pedaudiologic Department, University Hospital
Technical University Aachen, Germany

In this contribution a novel method is presented, allowing the detection of resonance frequencies of an externally excited vocal tract in a fast and robust non-invasive manner. The method can be applied alternatively to linear prediction coding (LPC) analysis for patients with voice and speech disorders. Sweep signals are emitted and recorded simultaneously from the small end of a tube that is placed in front of the mouth opening. The use of two sensors, a pressure sensor and a velocity sensor provides a direct measurement of the vocal tract mouth impedance (VTMI). For selected sustained German vowels and some consonants a comparison of results from LPC analysis and VTMI measurements is given. The results indicate a good agreement in the frequency range from 500 Hz to 5000 Hz. The feasibility of the VTMI method for diagnostic and therapeutic applications is subject to current research.

Index Terms. impedance, VTMI, vocal tract, correlation technique, velocity

Full Paper

Bibliographic reference.  Kob, Malte / Neuschaefer-Rube, Christiane (2001): "A method for measurement of the vocal tract mouth impedance", In MAVEBA-2001, 138-143.