| Popis: |
In this paper, methods of predicting the sound pressure at the ear drum are compared to probe tube measurements in 30 human ears occluded by closed ear molds. The methods compared fall into two categories: in one of them, the acoustical source (receiver and tubing) is modeled independently from the individual ear, in the other one it is modeled jointly with the individual ear. Models of the individual ear include modified variants of the phase reflectance and the pressure minima methods and a model of an ear simulator. As a result, it appears that the modified phase reflectance method works best for independent models of source and ear, whereas the modified pressure minima method works best for joint models of source and ear. With these methods, acceptable accuracies can be obtained in the frequency range from 100 Hz to 10 kHz, except for a few extremely large ear canals. |
