Effect of improving audibility on better-ear glimpsing using non-linear amplification

Baljeet Rana*, Jörg M. Buchholz

*Corresponding author for this work

    Research output: Contribution to journalArticle

    1 Citation (Scopus)
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    Abstract

    Better-ear glimpsing (BEG) utilizes interaural level differences (ILDs) to improve speech intelligibility in noise. This spatial benefit is reduced in most hearing-impaired (HI) listeners due to their increased hearing loss at high frequencies. Even though this benefit can be improved by providing increased amplification, the improvement is limited by loudness discomfort. An alternative solution therefore extends ILDs to low frequencies, which has been shown to provide a substantial benefit from BEG. In contrast to previous studies, which only applied linear stimulus manipulations, wide dynamic range compression was applied here to improve the audibility of soft sounds while ensuring loudness comfort for loud sounds. Performance in both speech intelligibility and BEG was measured in 13 HI listeners at three different masker levels and for different interaural stimulus manipulations. The results revealed that at low signal levels, performance substantially improved with increasing masker level, but this improvement was reduced by the compressive behaviour at higher levels. Moreover, artificially extending ILDs by applying infinite (broadband) ILDs provided an extra spatial benefit in speech reception thresholds of up to 5 dB on top of that already provided by natural ILDs and interaural time differences, which increased with increasing signal level.

    Original languageEnglish
    Pages (from-to)3465-3474
    Number of pages10
    JournalJournal of the Acoustical Society of America
    Volume144
    Issue number6
    DOIs
    Publication statusPublished - Dec 2018

    Bibliographical note

    Copyright 2018 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in Rana, B., & Buchholz, J. M. (2018). Effect of improving audibility on better-ear glimpsing using non-linear amplification. The Journal of the Acoustical Society of America, 144(6), 3465-3474 and may be found at https://doi.org/10.1121/1.5083823

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