Adjustments of the amplitude mapping function: Sensitivity of cochlear implant users and effects on subjective preference and speech recognition.
Objective: In sound processors of cochlear implant (CI) users, input sound signals are analysed in multiple frequency channels. The amplitude mapping function (AMF) is the output compression function dictating the conversion from (acoustical) channel output levels to (electrical) current levels used...
| Publicado en: | International Journal of Audiology Vol. 55; no. 11; pp. 674 - 688 |
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| Autores principales: | , , , |
| Formato: | research tables/charts Journal Article |
| Publicado: |
Taylor & Francis Ltd
Nov2016
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=118003433&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 118003433 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 14992027 JW2 jtl: International Journal of Audiology issn: 14992027 maglogo: Y pubinfo: dt: Nov2016 vid: 55 iid: 11 pid: 377 pub: Taylor & Francis Ltd place: Philadelphia, Pennsylvania artinfo: ui: 118003433 118003433 118003433 10.1080/14992027.2016.1202454 118003433 ppf: 674 ppct: 14 formats: fmt: – @attributes: type: T – @attributes: type: P tig: atl: Adjustments of the amplitude mapping function: Sensitivity of cochlear implant users and effects on subjective preference and speech recognition. aug: au: Theelen–van den Hoek, Femke L. Boymans, Monique van Dijk, Bas Dreschler, Wouter A. affil: Clinical and Experimental Audiology, Academic Medical Center, Amsterdam, The Netherlands sug: subj: Cochlear Implant Evaluation Patient Care Audiology Human Patient Assessment Speech Reception Threshold Test Phonetics Cochlea Anatomy and Histology Acoustic Stimulation Data Collection Qualitative Studies Quantitative Studies Data Analysis Data Analysis Software Learning Hearing Tests Speech Scales Funding Source ab: Objective: In sound processors of cochlear implant (CI) users, input sound signals are analysed in multiple frequency channels. The amplitude mapping function (AMF) is the output compression function dictating the conversion from (acoustical) channel output levels to (electrical) current levels used for electrode stimulation. This study focused on the detectability of AMF adjustments by CI users and the effects of detectable AMF adjustments on subjective preference and performance.Design: Just noticeable differences (JNDs) for AMF settings were measured for pre-processed sentences at 60 dB SPL in quiet and noise. Three AMF settings, ranging twice the JND, were used during a take-home trial period of 12 days. Subjective ratings were collected and speech recognition in quiet and noise was measured.Study sample: JND measurements: 17 CI users. Field experiment: 15 CI users.Results: JNDs for AMF settings varied among subjects and were similar in quiet and noise. A steeper AMF in the lower part was advantageous for speech recognition in quiet at soft levels. Subjective ratings showed limited agreement with speech recognition, both in quiet and noise.Conclusions: CI users may benefit from different AMF settings in different listening situations regarding subjective preference and speech perception, especially for speech in quiet. pubtype: Academic Journal doctype: research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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