Third International Conference on Spoken Language Processing (ICSLP 94)

Yokohama, Japan
September 18-22, 1994

Measument of Palatolingual Contact Pressure During Consonant Productions Using Strain Gauge Transducer Mounted Platal Plate

Masafumi Matsumura (1), Kazuo Kimura (1), Katsumi Yoshino (2), Takashi Tachimura (3), Takeshi Wada (3)

(1) Department of Applied Electronics, Faculty of Engineering, Osaka Electro-Communication University, Neyagawa, Japan
(2) Department of Electronic Engineering, Faculty of Engineering, Osaka University, Suita, Japan
(3) Division for Oral-Facial Disorders, Faculty of Dentistry, Osaka University, Suita, Japan

This paper deals with the measurement of palatolingual contact stress and pattern during consonant productions using a force sensor mounted palatal plate. The force sensor is composed of a strain gauge and a fixed beam that are mounted together in a palatal plate that is attached to the hard palate. The palatolingual contact stress is concentrated in a spot on the fixed beam by a protuberance bonded on the fixed beam. When the tongue touches the protuberance of the force sensor, the palatolingual contact stress on the force sensor is detected from the strain produced in the fixed beam. By mounting multiple force sensors, the palatolingual contact stress and pattern can be obtained. We have developed a prototype system, which consists of a five-force-sensor mounted palatal plate, a multi-channel amplifier for a strain gauge and a computer. The force sensor mounted palatal plate is LMM in thickness. The five-force-sensors are placed approximately at a 6mm interval along the midsagittal line of the hard palate. The most anterior sensor is located 5mm posterior to the alveolar ridge. Output of the force sensor was proportional to the stress applied to the fixed beam and had no hysteresis. Measurement error of the force sensor was less than 2% and an error by mechanical interferences among the sensors was less than 5.4%. The palatolingual contact stress and pattern for an adult male were measured during the productions of consonants /t/,/d/,/n/. Using the proposed system, dynamic aspect of the palatolingual contact stress in time-domain and space-domain were readily observed.

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Bibliographic reference.  Matsumura, Masafumi / Kimura, Kazuo / Yoshino, Katsumi / Tachimura, Takashi / Wada, Takeshi (1994): "Measument of palatolingual contact pressure during consonant productions using strain gauge transducer mounted platal plate", In ICSLP-1994, 655-658.