Détail de l'auteur
Auteur Steven C. Marcrum |
Documents disponibles écrits par cet auteur
trié(s) par (Pertinence décroissant(e), Titre croissant(e)) Faire une suggestion Affiner la rechercheActivating a Noise-Gating Algorithm and Personalizing Electrode Threshold Levels Improve Recognition of Soft Speech for Adults With CIs / Steven C. Marcrum in Ear and hearing, Vol. 42, n°5 (Septembre-Octobre 2021)
Titre : Activating a Noise-Gating Algorithm and Personalizing Electrode Threshold Levels Improve Recognition of Soft Speech for Adults With CIs Type de document : Article Auteurs : Steven C. Marcrum ; Erin M. Picou ; Christopher Bohr ; Thomas Steffens Année de publication : 2021 Article en page(s) : p. 1208-1217 Langues : Anglais (eng) Descripteurs : HE Vinci
Implants cochléaires ; Reconnaissance de la parole ; Réduction de bruit (NR) ; Traitement du signal sonoreRésumé : Objective: In contrast to the moderate presentation levels most commonly used in clinical practice, speech encountered in everyday life often occurs at low levels, such as when a conversational partner whispers or speaks from another room. In addition, even when the overall signal level is moderate, levels for particular words or speech sounds, such as voiceless consonants, can be considerably lower. Existing techniques for improving recognition of low-level speech for cochlear implant users include using a wider input dynamic range and elevating electrode threshold levels (T-levels). While these techniques tend to positively impact recognition of soft speech, each has also been associated with drawbacks. Recently, a noise-gating (NG) algorithm was reported, which works by eliminating input to an electrode when signal level in the associated frequency channel is at or below a predetermined threshold. Available evidence suggests that activation of this algorithm can improve recognition of sentences presented at low levels (35 to 50 dB SPL), though it remains unclear whether the benefits will be equally evident with both manufacturer default and individually optimized T-levels. The primary aim of this study was therefore to evaluate the independent and combined effects of NG activation and T-level personalization.
Methods: Twenty adults between the ages of 25 and 77 years (M = 54.9 years, SD = 17.56) with postlingually acquired profound hearing loss completed testing for this study. Participants were fit with an Advanced Bionics Naida CI Q90 speech processor, which contained four programs based on each participant's existing everyday program. The programs varied by the NG algorithm setting (on, off) and T-level method (default 10% of M-level, personalized based on subjective ratings of "very quiet"). All participants completed speech sound detection threshold testing (/m/, /u/, /a/, /i/, /s/, and /[integral]/), as well as tests of monosyllabic word recognition in quiet (45 and 60 dB SPL), sentence recognition in quiet (45 and 60 dB SPL), and sentence recognition in noise (45-dB SPL speech, +10 dB SNR).
Results: Findings demonstrated that both activating NG and personalizing T-levels in isolation significantly improved detection (speech sounds) and recognition (monosyllables, sentences in quiet, and sentences in noise) of soft speech, with their respective individual effects being comparable. However, the lowest speech sound detection thresholds and the highest speech recognition performance were identified when NG was activated in conjunction with personalized T-levels. Importantly, neither T-level personalization nor NG activation affected recognition of speech presented at 60 dB SPL, which suggests the strategies should not be expected to interfere with recognition of average conversational speech.
Conclusions: Taken together, these data support the clinical recommendation of personalizing T-levels and activating NG to improve the detection and recognition of soft speech. However, future work is needed to evaluate potential limitations of these techniques. Specifically, speech recognition testing should be performed in the presence of diverse noise backgrounds and home-trials should be conducted to determine processing effects on sound quality in realistic environmentsDisponible en ligne : Oui En ligne : https://login.ezproxy.vinci.be/login?url=https://ovidsp.ovid.com/ovidweb.cgi?T=J [...] Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=289312
in Ear and hearing > Vol. 42, n°5 (Septembre-Octobre 2021) . - p. 1208-1217[article]
Titre : Avoiding disconnection: An evaluation of telephone options for cochlear implant users Type de document : Article Auteurs : Steven C. Marcrum ; Erin M. Picou ; Thomas Steffens Année de publication : 2017 Article en page(s) : p. 186-193 Langues : Anglais (eng) Descripteurs : HE Vinci
Implants cochléaires ; Instrumentation audiologique ; Perception de la parole
Autres descripteurs
Technologie d'assistance auditiveRésumé : The primary aim of this study was to evaluate the effect of coupling method on telephone-based speech recognition and perceived listening difficulty in noise for cochlear implant (CI) users. A secondary aim was to evaluate potential impacts of additional processing modifications within coupling conditions, such as activating noise reducing algorithms or muting environmental microphones. Accès : Contactez la bibliothèque d'Ixelles si le lien vers la ressource électronique ne fonctionne plus Disponible en ligne : Oui En ligne : https://login.ezproxy.vinci.be/login?url=https://www.tandfonline.com/doi/pdf/10. [...] Format de la ressource électronique : Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=210346
in International Journal of Audiology IJA > Vol. 56, n° 1-12 (January-December 2017) . - p. 186-193[article]Exemplaires (1)
Cote Support Localisation Section Disponibilité International journal of audiology IJA. Vol. 56, n° 1-12 (January-December 2017) Périodique papier Ixelles Rez Consultation sur place uniquement
Exclu du prêt
Titre : A clinical comparison of DPOAE fine structure reduction methods Type de document : Article Auteurs : Steven C. Marcrum ; Eva Höfle ; Erin M. Picou ; Thomas Steffens ; Peter Kummer ; Pingling Kwok Année de publication : 2021 Article en page(s) : p. 191-201 Langues : Anglais (eng) Descripteurs : HE Vinci
Audiologie pédiatrique ; Emissions otoacoustiques spontanées (OAEs) ; Perte d'audition
Autres descripteurs
Modulation de frequenceRésumé : Objective
To evaluate two real-time methods for reducing distortion product otoacoustic emission (DPOAE) fine structure in terms of DPOAE amplitude and fine structure depth.
Design
A prospective, repeated-measures design was used to assess DPOAE characteristics in response to a conventional stimulation method (Conv.), as well as for methods implementing either a generic suppressor tone (Supp.) or frequency modulation of the f2 primary tone (FM).
Study sample
Eighty-three young adults (58 females) between the ages of 20 and 34 years with normal hearing completed testing for this study.
Results
Use of the Conv. and FM methods resulted in consistently higher DPOAE levels relative to the Supp. method, with average advantages of 6 and 5 dB, respectively. For all methods, increased fine structure depth was observed for stimulation with lower level (25−45 dB SPL) and lower frequency (1000−3000 Hz) primary tones. Finally, use of the Supp. and FM methods resulted in significantly decreased fine structure depth relative to the Conv. method.
Conclusion
Through frequency modulation of the f2 primary tone, it was possible to reduce the depth of fine structure across a clinically meaningful range of stimulation levels and frequencies without concomitant reduction in DPOAE amplitude.Accès : Contactez la bibliothèque d'Ixelles si le lien vers la ressource électronique ne fonctionne plus Disponible en ligne : Oui En ligne : https://login.ezproxy.vinci.be/login?url=https://www.tandfonline.com/doi/full/10 [...] Format de la ressource électronique : Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=266452
in International Journal of Audiology IJA > Vol. 60, n°3 (Mars 2021) . - p. 191-201[article]
Titre : Effects of text supplementation on speech intelligibility for listeners with normal and impaired hearing: a systematic review with implications for telecommunication Type de document : Article Auteurs : Ling Zhonga ; Brianne P. Noud ; Harriet Pruitt ; Steven C. Marcrum ; Erin M. Picou Année de publication : 2022 Article en page(s) : p. 1-11 Note générale : 10.1080/14992027.2021.1937346 Langues : Anglais (eng) Descripteurs : HE Vinci
Perception de la parole ; Télé-audiologie ; Texte ; Vieillissement du système auditif
Autres descripteurs
Mesure comportementaleRésumé : Objective
Telecommunication can be difficult in the presence of noise or hearing loss. The purpose of this study was to systematically review evidence regarding the effects of text supplementation (e.g. captions, subtitles) of auditory or auditory-visual signals on speech intelligibility for listeners with normal or impaired hearing.
Design
Three databases were searched. Articles were evaluated for inclusion based on the Population Intervention Comparison Outcome framework. The Effective Public Health Practice Project instrument was used to evaluate the quality of the identified articles.
Study sample
After duplicates were removed, the titles and abstracts of 2019 articles were screened. Forty-six full texts were reviewed; ten met inclusion criteria.
Results
The quality of all ten articles was moderate or strong. The articles demonstrated that text added to auditory (or auditory-visual) signals improved speech intelligibility and that the benefits were largest when auditory signal integrity was low, accuracy of the text was high, and the auditory signal and text were synchronous. Age and hearing loss did not affect benefits from the addition of text.
Conclusions
Although only based on ten studies, these data support the use of text as a supplement during telecommunication, such as while watching television or during telehealth appointments.Accès : Contactez la bibliothèque d'Ixelles si le lien vers la ressource électronique ne fonctionne plus Disponible en ligne : Oui En ligne : https://login.ezproxy.vinci.be/login?url=https://www.tandfonline.com/doi/epub/10 [...] Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=291214
in International Journal of Audiology IJA > Vol. 61, n°1 (Janvier 2022) . - p. 1-11[article]
Titre : Estimation of Minor Conductive Hearing Loss in Humans Using Distortion Product Otoacoustic Emissions Type de document : Article Auteurs : Steven C. Marcrum ; Peter Kummer ; Thomas Steffens Année de publication : 2017 Article en page(s) : p. 391-398 Langues : Anglais (eng) Descripteurs : HE Vinci
Conduction osseuse ; Produit de distorsion acoustique (PDA)Résumé : Objectives: Conductive hearing loss (CHL) systematically alters distortion product otoacoustic emission (DPOAE) levels through attenuation of both the primary tones and the evoked response by the middle ear, as well as through modification of the effective L1–L2 relationship within the cochlea. It has been postulated that, if optimal primary tone level relationships for an ear without CHL are known or can be estimated accurately and a CHL can be presumed to attenuate both primary tones to a similar extent, the adjustment to L1 required to restore an optimal L1–L2 separation following CHL induction can be utilized to estimate CHL magnitude objectively. The primary aim of this study was to assess the feasibility of objectively estimating experimentally produced CHL in humans by comparing CHL estimates resulting from DPOAE- and pure-tone audiometry-based methods. A secondary aim was to compare the accuracy of DPOAE-based CHL estimates when obtained using generic, as opposed to ear-specific, optimal primary tone level formula parameters.
Design: For a single ear of 30 adults with normal hearing, auditory threshold for a 1 kHz tone was obtained using automated Békésy audiometry at an ear-canal pressure of 0 daPa, as well as at a negative pressure sufficient for increasing threshold by 3 to 10 dB. The difference in threshold for the ear-canal pressure conditions was defined as the pure-tone audiometry-based estimate of CHL (CHLPT). For the same two ear-canal pressures, optimal DPOAE primary tone level relationships were identified for f2 = 1 kHz. Specifically, for 20
Results: A highly significant linear dependence was identified between pure-tone audiometry- and DPOAE-based estimates of CHL, r(19) = 0.71, p
Conclusions: This study provides empirical support for a theory of how CHL, through a combination of middle ear filtering and alteration of effective primary tone level relationships within the cochlea, systematically affects DPOAE amplitude. Although CHLDP was shown to be significantly predictive of CHLPT when optimization formula parameters for a given ear, both with and without mild CHL, were known, the lack of a meaningful relationship when using generic primary tone level formula parameters significantly limits the method’s potential for clinical utility.Disponible en ligne : Oui En ligne : https://login.ezproxy.vinci.be/login?url=http://ovidsp.ovid.com/ovidweb.cgi?T=JS [...] Permalink : https://bib.vinci.be/opac_css/index.php?lvl=notice_display&id=216953
in Ear and hearing > Vol.38, n° 4 (Juillet/Août 2017) . - p. 391-398[article]
