Abstract
In this report, we investigated the performance comparison of Three-Forced Choice (3AFC) with a pair of Bluetooth-connected active noise cancelling headphones and Two-Forced Choice (2AFC) in an audiological booth for audiometry examination. The procedure was essentially to generate mono pure tone on six different frequencies with adaptive loudness level to both left and right ear, respectively. The subject presented the pure tone, then he or she pressed a button. If it is right than the loudness level will be lowered until it is inaudible. This level was marked as the hearing threshold of the subject. We recruited 38 normal-hearing subjects who underwent to an audiology clinic for audiometry examination (using the gold standard, 2AFC technique). The recorded responses were statistically analyzed using non-parametric Wilcoxon test with Bonferroni correction. The audiometry results using the outdoor 3AFC method on 2000 Hz and 4000 Hz have mean-differences closer to ISO 226 accuracy reference for all 38 participants. These results suggested that the proposed technique may replace the gold standard.
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