An Evaluation of Output Signal to Noise Ratio as a Predictor of Cochlear Implant Speech Intelligibility

Ear and Hearing
Greg D WatkinsGregg J Suaning

Abstract

Cochlear implant (CI) sound processing strategies are usually evaluated in clinical studies involving experienced implant recipients. Metrics which estimate the capacity to perceive speech for a given set of audio and processing conditions provide an alternative means to assess the effectiveness of processing strategies. The aim of this research was to assess the ability of the output signal to noise ratio (OSNR) to accurately predict speech perception. It was hypothesized that compared with the other metrics evaluated in this study (1) OSNR would have equivalent or better accuracy and (2) OSNR would be the most accurate in the presence of variable levels of speech presentation. For the first time, the accuracy of OSNR as a metric which predicts speech intelligibility was compared, in a retrospective study, with that of the input signal to noise ratio (ISNR) and the short-term objective intelligibility (STOI) metric. Because STOI measured audio quality at the input to a CI sound processor, a vocoder was applied to the sound processor output and STOI was also calculated for the reconstructed audio signal (vocoder short-term objective intelligibility [VSTOI] metric). The figures of merit calculated for each metric were Pearson co...Continue Reading

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Citations

Mar 1, 2021·The Journal of the Acoustical Society of America·Reemt HinrichsWaldo Nogueira
Jul 10, 2021·The Journal of the Acoustical Society of America·Kristina DeRoy MilvaeElizabeth A Strickland
Mar 29, 2019·ORL; Journal for Oto-rhino-laryngology and Its Related Specialties·Henryk SkarzynskiPiotr H Skarzynski

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