MASKING IN SPEECH AUDIOMETRY

Abstract

INTRODUCTION AND OBJECTIVES

In this paper we reviewed and analyzed masking techniques for speech audiometry as published by various authors. Additionally, we measured Interaural attenuation values for supra-aural headphones and insert earphones by using speech material in Rioplatense Spanish (Argentina and Uruguay dialect).

MATERIALS AND METHODS

Based on the mid-plateau technique, masking levels were positioned in the middle of the plateau, between the minimum and maximum values, to minimize the risks of undermasking and overmasking. Differences with other methods present in the literature were evaluated. Twelve subjects with profound unilateral sensorineural losses participated in the interaural attenuation measurements. Interaural attenuation was calculated as the difference in threshold levels without masking for speech stimuli presented to both ears.

RESULTS AND CONCLUSIONS

a) The mid-plateau method was found to be the most effective among the studied methods, as it positions the masking level in the middle of the plateau, minimizing the probability of under or overmasking. b) The mean values of interaural attenuation were 58.4 dB and 66.8 dB for supra-aural and insert earphones, respectively. The minimum recorded values were 53 dB for supra-aural headphones and 60 dB for insert earphones, which is consistent with the values reported with other languages material.