PMID: 11605950Oct 19, 2001Paper

Effects of the number of channels and speech-to-noise ratio on rate of connected discourse tracking through a simulated cochlear implant speech processor

Ear and Hearing
Andrew FaulknerL Wilkinson

Abstract

To investigate the effects of number of channels and speech-to-noise ratio on connected discourse tracking (CDT) through simulations of cochlear implant speech processing. Previous studies have used citation-form vowel and consonant materials or simple sentences. CDT rates were expected to be less likely to be limited by ceiling effects and more representative of everyday speech communication. Four normal-hearing subjects were presented with speech processed through a real-time sine-excited vocoder having three, four, eight, or 12 channels. Amplitude envelopes extracted from each band modulated sinusoidal carrier signals placed at each band center frequency. Speech-spectrum shaped noise was added to speech before vocoder processing at three signal to noise ratios based on real-time measurements of speech level (+7, +12, +17 dB). CDT rates increased significantly with number of channels up to eight in both quiet and noise, and decreased significantly with each increase in noise level from quiet. The effects on CDT rates of the number of channels and speech-to-noise ratio are highly correlated with intelligibility measures for Hearing in Noise Test (HINT) sentences, consonants and vowels. However, HINT sentence scores even in noi...Continue Reading

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Citations

Dec 22, 2005·Journal of Experimental Psychology. Human Perception and Performance·Jonathan E Peelle, Arthur Wingfield
Mar 25, 1999·The Journal of the Acoustical Society of America·Q J Fu, R V Shannon
May 9, 2012·The Journal of the Acoustical Society of America·Soha N GaradatBryan E Pfingst
Mar 25, 2010·The Journal of the Acoustical Society of America·Catherine M SicilianoKatharine Mair
Apr 6, 2013·The Journal of the Acoustical Society of America·Stuart RosenArooj A Majeed
Jan 3, 2016·Hearing Research·Yune-Sang LeeJonathan E Peelle
Dec 20, 2015·Experimental Aging Research·Caitlin M WardJonathan E Peelle
Aug 8, 2015·IEEE Journal of Solid-state Circuits·Marcus YipAnantha P Chandrakasan
Apr 19, 2003·Acta Oto-laryngologica·Johan H M FrijnsJeroen J Briaire
Nov 9, 2016·Frontiers in Human Neuroscience·Malte Wöstmann, Jonas Obleser
Aug 31, 2006·The Journal of the Acoustical Society of America·Sophie K ScottRichard J S Wise
Mar 24, 2017·Cerebral Cortex·Malte WöstmannJonas Obleser
Jul 25, 2017·Journal of the Association for Research in Otolaryngology : JARO·Anahita H Mehta, Andrew J Oxenham

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