Comparison of dual-time-constant and fast-acting automatic gain control (AGC) systems in cochlear implants.
Cochlear implants usually employ an automatic gain control (AGC) system as a first stage of processing. AGC1 was a fast-acting (syllabic) compressor. AGC2 was a dual-time-constant system; it usually performed as a slow-acting compressor, but incorporated an additional fast-acting system to provide p...
| Publicado en: | International Journal of Audiology Vol. 48; no. 4; pp. 211 - 222 |
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| Autores principales: | , , , , |
| Formato: | research tables/charts Journal Article |
| Publicado: |
Taylor & Francis Ltd
Apr2009
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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=105512471&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 105512471 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 14992027 JW2 jtl: International Journal of Audiology issn: 14992027 maglogo: Y pubinfo: dt: Apr2009 vid: 48 iid: 4 pid: 377 pub: Taylor & Francis Ltd place: Philadelphia, Pennsylvania artinfo: ui: 105512471 2010260834 10.1080/14992020802581982 NLM19363722 105512471 ppf: 211 ppct: 11 formats: fmt: @attributes: type: P tig: atl: Comparison of dual-time-constant and fast-acting automatic gain control (AGC) systems in cochlear implants. aug: au: Boyle PJ Büchner A Stone MA Lenarz T Moore BCJ affil: Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge, UK. patrickb@abionics.fr sug: subj: Cochlear Implant Cochlear Implant Programming Methods Equipment Design Rehabilitation of Persons with Hearing Loss Signal Processing, Computer Assisted Acoustic Stimulation Adult Aged Algorithms Analysis of Variance Audiorecording Comparative Studies Consumer Attitudes Deafness Psychosocial Factors Descriptive Statistics Funding Source Germany Middle Age Music Noise Product Evaluation Questionnaires Random Assignment Hyperacusis Reference Values Repeated Measures Scales Speech Speech Discrimination Tests Speech Perception Task Performance and Analysis Human Adult: 19-44 years Aged: 65+ years Middle Aged: 45-64 years ab: Cochlear implants usually employ an automatic gain control (AGC) system as a first stage of processing. AGC1 was a fast-acting (syllabic) compressor. AGC2 was a dual-time-constant system; it usually performed as a slow-acting compressor, but incorporated an additional fast-acting system to provide protection from sudden increases in sound level. Six experienced cochlear-implant users were tested in a counterbalanced order, receiving one-month of experience with a given AGC type before switching to the other type. Performance was evaluated shortly after provision of a given AGC type and after one-month of experience with that AGC type. Questionnaires, mainly relating to listening in quiet situations, did not reveal significant differences between the two AGC types. However, fixed-level and roving-level tests of sentence identification in noise both revealed significantly better performance for AGC2. It is suggested that the poorer performance for AGC1 occurred because AGC1 introduced cross-modulation between the target speech and background noise, which made perceptual separation of the target and background more difficult. pubtype: Academic Journal doctype: research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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