PMID: 15224856Jul 1, 2004Paper

Speech recognition with a cochlear implant using triphasic charge-balanced pulses

Acta Oto-laryngologica
Raymond M BonnetJeroen J Briaire

Abstract

Typically, symmetrical charge-balanced biphasic current pulses are used in cochlear implants to ensure biological safety. Theoretically, monophasic pulses are more effective, but potentially noxious, stimuli. In this study we charge-balanced such monophasic pulses during selected non-stimulated intervals, effectively leading to triphasic pulses with a 4:1 amplitude ratio between the cathodic and anodic phases. Apart from ensuring safety, this is also expected to reduce power consumption and channel interaction. Seven experienced Clarion CII cochlear implant users with a multichannel (12-16 channels) monopolar continuous interleaved sampling (CIS) strategy participated in the study. Three different CIS strategies were fitted using the Clarion Research Interface (CRI-2). The reference was an implementation of each subject's own CIS program. The two strategies tested used triphasic pulses on the same channels, one with half-wave rectification (TP-HWR) and one without rectification (TP-NoR) at the input. Directly after fitting (i.e. without any training), speech perception (phoneme score on consonant-vowel-consonant words) was measured in silence (sound-only) and in speech-shaped background noise with signal:noise ratios (SNRs) of ...Continue Reading

References

Sep 1, 1977·IEEE Transactions on Bio-medical Engineering·S B Brummer, M J Turner
Jul 18, 1991·Nature·B S WilsonW M Rabinowitz
Oct 5, 2001·IEEE Transactions on Bio-medical Engineering·J T RubinsteinP J Abbas
Apr 19, 2003·Acta Oto-laryngologica·Johan H M FrijnsJeroen J Briaire
Jul 12, 2003·Hearing Research·Colette M McKay, Katherine R Henshall

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Citations

May 23, 2006·Journal of the Association for Research in Otolaryngology : JARO·Olivier MachereyJan Wouters
May 13, 2008·Hearing Research·Astrid van WieringenJan Wouters
Jan 26, 2005·Hearing Research·Astrid van WieringenJan Wouters
Aug 31, 2019·Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology·Katharina BraunAnke Tropitzsch
Feb 6, 2020·Journal of the Association for Research in Otolaryngology : JARO·Quentin MesnildreyOlivier Macherey
Feb 2, 2021·Frontiers in Psychology·Colette M McKay
Dec 23, 2021·Trends in Hearing·Charlotte Amalie NavntoftJeremy Marozeau

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