A few research studies have reported variations in the contribution of the band-importance function (BIF) to speech intelligibility in different languages. These differences could mean that hearing impairment may not have the same effect on understanding the speech of speakers with different linguistic backgrounds, raising the question of whether speech-processing algorithms should be customized accordingly ( J Acoust Soc Am . 2007;121[4]:2350 http://bit.ly/2qn9Xfd ). In a recent report, Jin and colleagues examined this important issue in the context of Mandarin and Korean by deriving count-the-dot audiograms based on their BIFs and comparing the audibility of these languages with English ( J Am Acad Audio . 2017;28[2]:119 https://www.ncbi.nlm.nih.gov/pubmed/28240979 ). BIF AND SI CONNECTION Figure. iStockAnnato… The BIF is a measure of a frequency band’s relative contribution to speech intelligibility. BIFs at individual frequency bands are combined into a speech intelligibility index (SII) ranging from 0 to 1, with 0 indicating no speech intelligibility and 1 suggesting full intelligibility. The SII summarizes the proportion of linguistically important speech cues that are audible across frequency bands. When hearing loss is involved and some speech information is therefore inaudible, the band audibility function (BAF) is used to describe the speech energy that is […]

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