Measurement of radiation characteristics using replicas of the lips

概要

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The radiation characteristcs at the lips are measured by using plaster replicas maintaining actual lip shapes under several articulatory condition for vowels. The experimental results are represented in terms of reflection coefficients of volume velocity to facilitate interpretation in physical condition. It is shown that the measured data are different from theoretical values of a circular pistion model both in amplitude and in phase characteristics. We then present a radiation model approximating experimental results under the assumption of plane wave propagation, which is a highly simplified model but has sufficient approximation accuracy. By use of the proposed radiation model, we can determine the equivalent radiating plane, and can consequently remove ambiguity of vocal-tract length due to uncertainty of the radiating region for actual lips.
社団法人日本音響学会の論文