Abstract
A numerical procedure is investigated for the analysis of hearing aid feedback. The receiver, connecting tubes, ear channel, and vent are considered by means of the standard transfer matrix method. The receiver transfer matrix is obtained experimentally through the two load method, while the transfer matrices representing the other components are obtained by assuming plane waves and taking in account viscous-thermal effects. The radiation impedance of the vent and the transfer function between the vent outlet and the microphone are calculated using the boundary element method and the fast multipole method (FMM-BEM). The use of FMM-BEM solver allows the solution of considerably larger models than standard BEM solvers, which means that finer details of the pinna, vent outlet, and hearing aid microphone may be included in the analysis. Numerical results are compared with experimental data obtained using a hearing aid mounted on the pinna of a manikin, and good agreement is observed.
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