Sistema Integrado para Cancelamento de Realimentação e Redução do Efeito de Oclusão em Aparelhos Auditivos

This work presents a joint strategy for feedback canceling and reduction of the occlusion-effect in hearing aids. Positive feedback and the occlusion-effect are undesired phenomena, in which, in general, efforts for attenuation of one correspond to amplification of the other. To avoid this antagonism, an active approach based on the Least Mean Square algorithm with updates in the frequency domain is proposed; in which, the occlusion effect is handled in low frequencies, while the feedback is treated in high frequencies. Computational simulations and psychoacoustic assessment with volunteers support the efficiency of the proposed method.