Measurement of acoustic reflection characteristics of the human cheek

概要

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The vocal tract wall impedance is considered to be related to the transmission loss in the vocal tract and to the radiation from the wall of the vocal tract, and is important in constructing an acoustic model or a circuit model of the speech production system. The wall impedance has been measured by mechanical methods before. Since the vibration of the wall is considered to be caused by the sound pressure in the vocal tract, we propose an approach for direct measurement of the reflection characteristics of the human cheek from the sound pressure distribution in a uniform tube whose end is fixed on the cheek surface. We obtained similar reflection characteristics between male cheeks and female ones. Quite similar characteristics are obtained for the inner wall of the cheek and the outer. Moreover, the characteristics can be expressed by two acoustic impedance constants. Comparing our impedance parameters with those reported by some other researchers, ours are relatively smaller. We also show the effects of our impedance parameters on the transfer characteristics of the vocal tract.
社団法人日本音響学会の論文