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Monolateral and Bilateral Fitting with Different Hearing Aids Directional Configurations

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Hearing aid bilateral fitting in hearing impaired subjects raises some problems concerning the interaction of the perceptual binaural properties with the directional characteristics of the device. This experiment aims to establish whether and to which extent in a sample of 20 normally hearing subjects the binaural changes in the speech-to-noise level ratio (s/n), caused by different symmetrical and asymmetrical microphone configurations, and different positions of the speech signal (frontal or lateral), could alter the performances of the speech recognition in noise. Speech Reception Threshold (SRT) in noise (simulated through an Ambisonic virtual soundfield) has been measured monolaterally and bilaterally in order to properly investigate the role of the binaural interaction in the perception of reproduced signals.

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