Dispositivo e Método para Análise de Emissões Otoacústicas Evocadas Transientes

This work presents a device and method for estimation and analysis of transient evoked otoacoustic emissions (TEOAE). The proposed method consists on an active noise canceller, based on the NLMS adaptive filter, which applies a noise-environment reference-signal acquired by an external microphone which is incorporated into the stimulation probe. The aim is to reduce the duration of the clinical exam or newborn screening as compared to commercial gadgets. Experiments with real signals, for SNR = −31 dB, resulted in a detection time decrease of 38% as compared to the absence of the canceller.