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L'effet filtre peigne en audioprothèse / Fabien Seldran in Cahiers de l'audition, Vol. 36, n°2 (Mars-Avril 2023)
Titre : L'effet filtre peigne en audioprothèse Type de document : Article Auteurs : Fabien Seldran Année de publication : 2023 Article en page(s) : p. 36-40 Langues : Français (fre) Descripteurs : HE Vinci
Acoustique ; Audioprothèse ; Traitement du signal sonore
Résumé : Leffet filtre peigne est un phénomène qui se produit lorsquun signal
sonore est présenté parallèlement en direct et avec une version
décalée temporellement de lui-même. Ce phénomène est connu dans
le domaine de lacoustique, mais il est moins connu dans le domaine de
laudioprothèse car son influence a été peu étudiée dans la littérature
en audiologie. Les principaux travaux qui ont mis en évidence cette
problématique, ont été conduits par léquipe de Brian Moore à la fin
des années 90 début des années 2000, une des premières études
ayant investigué linfluence du temps de traitement des appareils sur la
perception de la parole étant celle de Stone et Moore (1999).
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in Cahiers de l'audition > Vol. 36, n°2 (Mars-Avril 2023) . - p. 36-40[article]Human Frequency Following Responses to Filtered Speech / Saradha Ananthakrishnan in Ear and hearing, Vol. 42, n°1 (Janvier-Février 2021)
Titre : Human Frequency Following Responses to Filtered Speech Type de document : Article Auteurs : Saradha Ananthakrishnan ; Laura Grinstead ; Danielle Yurjevich Année de publication : 2021 Article en page(s) : p. 87-105 Langues : Anglais (eng) Descripteurs : Autres descripteurs
Filtre auditif ; Frequence fondamentale (FO)
Résumé : Objectives: There is increasing interest in using the frequency following response (FFR) to describe the effects of varying different aspects of hearing aid signal processing on brainstem neural representation of speech. To this end, recent studies have examined the effects of filtering on brainstem neural representation of the speech fundamental frequency (f0) in listeners with normal hearing sensitivity by measuring FFRs to low- and high-pass filtered signals. However, the stimuli used in these studies do not reflect the entire range of typical cutoff frequencies used in frequency-specific gain adjustments during hearing aid fitting. Further, there has been limited discussion on the effect of filtering on brainstem neural representation of formant-related harmonics. Here, the effects of filtering on brainstem neural representation of speech fundamental frequency (f0) and harmonics related to first formant frequency (F1) were assessed by recording envelope and spectral FFRs to a vowel low-, high-, and band-pass filtered at cutoff frequencies ranging from 0.125 to 8 kHz.
Design: FFRs were measured to a synthetically generated vowel stimulus /u/ presented in a full bandwidth and low-pass (experiment 1), high-pass (experiment 2), and band-pass (experiment 3) filtered conditions. In experiment 1, FFRs were measured to a synthetically generated vowel stimulus /u/ presented in a full bandwidth condition as well as 11 low-pass filtered conditions (low-pass cutoff frequencies: 0.125, 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, and 8 kHz) in 19 adult listeners with normal hearing sensitivity. In experiment 2, FFRs were measured to the same synthetically generated vowel stimulus /u/ presented in a full bandwidth condition as well as 10 high-pass filtered conditions (high-pass cutoff frequencies: 0.125, 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, and 6 kHz) in 7 adult listeners with normal hearing sensitivity. In experiment 3, in addition to the full bandwidth condition, FFRs were measured to vowel /u/ low-pass filtered at 2 kHz, band-pass filtered between 2-4 kHz and 4-6 kHz in 10 adult listeners with normal hearing sensitivity. A Fast Fourier Transform analysis was conducted to measure the strength of f0 and the F1-related harmonic relative to the noise floor in the brainstem neural responses obtained to the full bandwidth and filtered stimulus conditions.
Results: Brainstem neural representation of f0 was reduced when the low-pass filter cutoff frequency was between 0.25 and 0.5 kHz; no differences in f0 strength were noted between conditions when the low-pass filter cutoff condition was at or greater than 0.75 kHz. While envelope FFR f0 strength was reduced when the stimulus was high-pass filtered at 6 kHz, there was no effect of high-pass filtering on brainstem neural representation of f0 when the high-pass filter cutoff frequency ranged from 0.125 to 4 kHz. There was a weakly significant global effect of band-pass filtering on brainstem neural phase-locking to f0. A trends analysis indicated that mean f0 magnitude in the brainstem neural response was greater when the stimulus was band-pass filtered between 2 and 4 kHz as compared to when the stimulus was band-pass filtered between 4 and 6 kHz, low-pass filtered at 2 kHz or presented in the full bandwidth condition. Last, neural phase-locking to f0 was reduced or absent in envelope FFRs measured to filtered stimuli that lacked spectral energy above 0.125 kHz or below 6 kHz. Similarly, little to no energy was seen at F1 in spectral FFRs obtained to low-, high-, or band-pass filtered stimuli that did not contain energy in the F1 region. For stimulus conditions that contained energy at F1, the strength of the peak at F1 in the spectral FFR varied little with low-, high-, or band-pass filtering.
Conclusions: Energy at f0 in envelope FFRs may arise due to neural phase-locking to low-, mid-, or high-frequency stimulus components, provided the stimulus envelope is modulated by at least two interacting harmonics. Stronger neural responses at f0 are measured when filtering results in stimulus bandwidths that preserve stimulus energy at F1 and F2. In addition, results suggest that unresolved harmonics may favorably influence f0 strength in the neural response. Lastly, brainstem neural representation of the F1-related harmonic measured in spectral FFRs obtained to filtered stimuli is related to the presence or absence of stimulus energy at F1. These findings add to the existing literature exploring the viability of the FFR as an objective technique to evaluate hearing aid fitting where stimulus bandwidth is altered by design due to frequency-specific gain applied by amplification algorithms.
Note de contenu : Envelope and spectral frequency following response, Filtering, Formant frequency, Fundamental frequency, Neural phase-locking, Stimulus bandwidth Disponible en ligne : Oui En ligne : https://login.ezproxy.vinci.be/login?url=http://ovidsp.ovid.com/ovidweb.cgi?T=JS [...] Permalink :
in Ear and hearing > Vol. 42, n°1 (Janvier-Février 2021) . - p. 87-105[article]Implementation and evaluation of a Danish test battery for auditory processing disorder in children / Ellen Raben Pedersen ; Berit Dahl-Hansen ; Jakob Christensen-Dalsgaard ; Christian Brandt in International Journal of Audiology IJA, Vol. 56, n° 1-12 (January-December 2017)
Titre : Implementation and evaluation of a Danish test battery for auditory processing disorder in children Type de document : Article Auteurs : Ellen Raben Pedersen ; Berit Dahl-Hansen ; Jakob Christensen-Dalsgaard ; Christian Brandt Année de publication : 2017 Article en page(s) : p. 538-549 Langues : Anglais (eng) Descripteurs : Autres descripteurs
Ecoute dichotique ; Filtre auditif
Masquage ; Seuil de détection d'écart sonore ; Traitement auditif
Résumé : This study presents a Danish test battery for auditory processing disorder (APD). The tests were evaluated as to normative cut-off values (pass-fail criteria) and their testretest reliability. Design: The battery consists of four behavioural tests: the filtered words (FW) test, the dichotic digits (DD) test, the gap detection (GD) test and the binaural masking level difference (BMLD) test. The tests were evaluated through listening experiments on children with no known history of auditory problems. Study sample: The normative cut-off values were obtained from 158 children (75 boys and 83 girls, aged 616 years), whereas the testretest reliability was obtained from 20 children (10 boys and 10 girls, aged 611 years). Results: For each of the four tests one to four different cut-off values were determined depending on whether the scores from the two ears and the different age groups could be pooled. For each of the four tests the testretest reliability was found to be satisfactory. The testretest reliability was highest for the FW and the DD test. Conclusions: A Danish APD test battery is now available for clinical use with normative data. 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 :
in International Journal of Audiology IJA > Vol. 56, n° 1-12 (January-December 2017) . - p. 538-549[article]
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 prêtImproved Sensitivity of Digits-in-Noise Test to High-Frequency Hearing Loss / Lina Motlagh Zadeha in Ear and hearing, Vol. 42, n°3 (Mai- Juin 2021)
Titre : Improved Sensitivity of Digits-in-Noise Test to High-Frequency Hearing Loss Type de document : Article Auteurs : Lina Motlagh Zadeha ; Noah H. Silbert ; De Wet Swanepoel ; David R. Moore Année de publication : 2021 Article en page(s) : p. 565-573 Langues : Anglais (eng) Descripteurs : Autres descripteurs
Audiométrie haute fréquence (EHF) ; Compréhension dans le bruit ; Dépistage précoce de la surdité ; Digit in noise (DIN) ; Perception de la parole ; Seuil de réception de la parole (SRT)
Résumé : Objectives: Hearing loss is most commonly observed at high frequencies. High-frequency hearing loss (HFHL) precedes and predicts hearing loss at lower frequencies. It was previously shown that an automated, self-administered digits-in-noise (DIN) test can be sensitized for detection of HFHL by low-pass filtering the speech-shaped masking noise at 1.5 kHz. This study was designed to investigate whether sensitivity of the DIN to HFHL can be enhanced further using low-pass noise filters with higher cutoff frequencies.
Design: The US-English digits 0 to 9, homogenized for audibility, were binaurally presented in different noise maskers including one broadband and three low-pass (cutoff at 2, 4, and 8 kHz) filtered speech-shaped noises. DIN-speech reception thresholds (SRTs) were obtained from 60 normal hearing (NH), and 40 mildly hearing impaired listeners with bilateral symmetric sensorineural hearing loss. Standard and extended high-frequency audiometric pure-tone averages (PTAs) were compared with the DIN-SRTs.
Results: Narrower masking noise bandwidth generally produced better (more sensitive) mean DIN-SRTs. There were strong and significant correlations between SRT and PTA in the hearing impaired group. Lower frequency PTALF 0.5,1, 2, 4 kHz had the highest correlation and the steepest slope with SRTs obtained from the 2-kHz filter. Higher frequency PTAHF 4,8,10,12.5 kHz correlated best with SRTs obtained from 4- and 8-kHz filtered noise. The 4-kHz low-pass filter also had the highest sensitivity (92%) and equally highest (with the 8-kHz filter) specificity (90%) for detecting an average PTAHF of 20 dB or more.
Conclusions: Of the filters used, DIN sensitivity to higher frequency hearing loss was greatest using the 4-kHz low-pass filter. These results suggest that low-pass filtered noise may be usefully substituted for broadband noise to improve earlier detection of HFHL using DIN.
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in Ear and hearing > Vol. 42, n°3 (Mai- Juin 2021) . - p. 565-573[article]Instrumentation : An Introduction for Students in the Speech and Hearing Sciences / T. Newell Decker (2004)
Titre : Instrumentation : An Introduction for Students in the Speech and Hearing Sciences Type de document : Livre Auteurs : T. Newell Decker ; Thomas D. Carrel Mention d'édition : 3 ed. - Editeur : Hillsdale N.J. : Lawrence Erlbaum associates Année de publication : 2004 Importance : 184 p. ISBN/ISSN/EAN : 9780805846811 Prix : 39.10 Langues : Anglais (eng) Descripteurs : HE Vinci
Amplificateur électronique ; Analyse spectrale ; Electricite ; Mesure acoustique ; Microphone ; Transducteurs
Attenuation ; Equipement audiometrique ; Filtre auditif ; Melangeur de son ; Signal digital
Résumé : Table of Contents, Contents: Preface to Third Edition. Preface to Second Edition. Preface to First Edition. Introduction. Introduction to Basic Electricity., Combining Equipment Into Arrays., Transducers., Digital Signal Processing and Experiment Control., Spectrum Analysis., Amplifiers, Attenuators, Mixers, and Filters., CRT Displays, Oscilloscopes, Recording, and Plotting., Analog and Digital Magnetic Tape Recorders., Sound Level Meters. Interfacing Laboratory Equipment With Consumer Electronics. Disponible en ligne : Non Permalink :
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