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Titre : | The Effects of Dynamic-range Automatic Gain Control on Sentence Intelligibility With a Speech Masker in Simulated Cochlear Implant Listening (2019) |
Auteurs : | Nathaniel J. Spencer ; Kate-Helms Tillery ; Christopher A. Brown |
Type de document : | Article |
Dans : | Ear and hearing (Vol. 40, n°3, mai-juin 2019) |
Article en page(s) : | p. 710-724 |
Langues: | Anglais |
Descripteurs : |
HE Vinci Contrôle automatique de gain (CAG) ; Implant cochléaire bilatéral ; INTELLIGIBILITE DANS LE BRUIT |
Résumé : |
Channel-linked and multi-band front-end automatic gain control (AGC) were examined as alternatives to single-band, channel-unlinked AGC in simulated bilateral cochlear implant (CI) processing. In channel-linked AGC, the same gain control signal was applied to the input signals to both of the two CIs (channels). In multi-band AGC, gain control acted independently on each of a number of narrow frequency regions per channel.
Speech intelligibility performance was measured with a single target (to the left, at -15 or -30°) and a single, symmetrically-opposed masker (to the right) at a signal-to-noise ratio (SNR) of -2 decibels. Binaural sentence intelligibility was measured as a function of whether channel linking was present and of the number of AGC bands. Analysis of variance was performed to assess condition effects on percent correct across the two spatial arrangements, both at a high and a low AGC threshold. Acoustic analysis was conducted to compare postcompressed better-ear SNR, interaural differences, and monaural within-band envelope levels across processing conditions. |
Disponible en ligne : | Oui |
En ligne : | https://login.ezproxy.vinci.be/login?url=http://ovidsp.ovid.com/ovidweb.cgi?T=JS&CSC=Y&NEWS=N&PAGE=fulltext&D=yrovftu&AN=00003446-201905000-00026 |