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Coding of interaural phase differences in BiCI users

  • The ability to detect a signal masked by noise is improved in normal-hearing (NH) listeners when interaural phase differences (IPD) between the ear signals exist either in the masker or the signal. We determined the impact of different coding strategies in bilaterally implanted cochlear implant (BiCI) users with and without fine-structure coding (FSC) on masking level differences. First, binauralThe ability to detect a signal masked by noise is improved in normal-hearing (NH) listeners when interaural phase differences (IPD) between the ear signals exist either in the masker or the signal. We determined the impact of different coding strategies in bilaterally implanted cochlear implant (BiCI) users with and without fine-structure coding (FSC) on masking level differences. First, binaural intelligibility level differences (BILD) were determined in NH listeners and BiCI users using their clinical speech processors. NH subjects (n=8) showed a significant mean BILD of 7.5 dB. In contrast, BiCI users (n=9) without FSC as well as with FSC revealed a barely significant mean BILD (0.4 dB respectively 0.6 dB). Second, IPD thresholds were measured in BiCI users using either their speech processors with FS4 or direct stimulation with FSC. With the latter approach, synchronized stimulation providing an interaural accuracy of stimulation timing of 1.67 µs was realized on pitch matched electrode pairs. The resulting individual IPD threshold was lower in most of the subjects with direct stimulation than with their speech processors. These outcomes indicate that some BiCI users can benefit from increased temporal precision of interaural FSC and adjusted interaural frequency-place mapping presumably resulting in improved BILD.show moreshow less

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Metadaten
Document Type:Conference Proceeding
Conference Type:Konferenzartikel
Zitierlink: https://opus.hs-offenburg.de/2224
Bibliografische Angaben
Title (English):Coding of interaural phase differences in BiCI users
Conference:5th International Symposium on Auditory and Audiological Research, Nyborg, Denmark Duration: 26 Aug 2015-28 Aug 2015
Author:Stefan ZirnStaff MemberORCiDGND, Susan Arndt, Thomas WesargStaff MemberORCiDGND
Year of Publication:2016
Place of publication:Ballerup
Publisher:Danavox Jubilee Foundation
First Page:341
Last Page:348
Parent Title (English):Proceedings of the International Symposium on Auditory and Audiological Research
Volume:5
ISBN:978-87-990013-5-4
URL:https://proceedings.isaar.eu/index.php/isaarproc/article/view/2015-40
Language:English
Inhaltliche Informationen
Institutes:Fakultät Elektrotechnik und Informationstechnik (E+I) (bis 03/2019)
Institutes:Bibliografie
GND Keyword:Bildverarbeitung; Radiologie
Formale Angaben
Open Access: Open Access 
Licence (German):License LogoUrheberrechtlich geschützt