Hearing Aid Signal Processing

Launer, Stefan; Zakis, Justin A.; Moore, Brian C. J.

doi:10.1007/978-3-319-33036-5_4

Cited by 36 publications

(38 citation statements)

References 96 publications

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“…This can lead to improved localization of speech and might improve the ability to understand speech in the presence of competing talkers, although the latter has not yet been assessed. Another possibility for listeners with poor binaural TFS sensitivity is to use binaural beamforming hearing aids, which can selectively amplify sounds from a specific direction, but at the expense of discarding IPD and ILD cues ( Launer, Zakis, & Moore, 2016 ). The loss of IPD cues would not be a major disadvantage for a listener who already has poor sensitivity to such cues.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of a Method for Determining Binaural Sensitivity to Temporal Fine Structure (TFS-AF Test) for Older Listeners With Normal and Impaired Low-Frequency Hearing

Füllgrabe

Moore

2017

Trends in Hearing

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The ability to process binaural temporal fine structure (TFS) information was assessed using the TFS-AF test (where AF stands for adaptive frequency) for 26 listeners aged 60 years or more with normal or elevated low-frequency audiometric thresholds. The test estimates the highest frequency at which a fixed interaural phase difference (IPD) of ϕ (varied here between 30° and 180°) can be discriminated from an IPD of 0°, with higher thresholds indicating better performance. A sensation level of 30 dB was used. All listeners were able to perform the task reliably, giving thresholds well above the lowest allowed frequency of 30 Hz. The duration of a run averaged 5 min. Repeated testing of the normal-hearing listeners showed no significant practice effects. Thresholds varied markedly across listeners, but their ranking was fairly consistent across values of ϕ. Thresholds decreased (worsened) with decreasing ϕ and were lower than for a group of young listeners tested in an earlier study. There were weak to moderate, negative correlations between TFS-AF thresholds and audiometric thresholds at low frequencies (125–1000 Hz) but not at high frequencies (4000–8000 Hz). In conclusion, the TFS-AF test yielded a graded measure of binaural TFS sensitivity for all listeners. This contrasts with the TFS-LF (low-frequency) test, which measures the smallest detectable shift in IPD for a fixed frequency. The absence of practice effects and a reasonably short administration time make the TFS-AF test a good candidate for the assessment of sensitivity to changes in binaural TFS for older listeners without or with hearing loss.

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Section: Discussionmentioning

confidence: 99%

Evaluation of a Method for Determining Binaural Sensitivity to Temporal Fine Structure (TFS-AF Test) for Older Listeners With Normal and Impaired Low-Frequency Hearing

Füllgrabe

Moore

2017

Trends in Hearing

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“…Therefore, no pinna cues were available. The hearing aids had an algorithm that was intended partly to reproduce pinna cues ( Launer, Zakis, & Moore, 2016 ). However, this may not have been enough to preserve the benefit of increasing the audible bandwidth ( Levy et al., 2015 ).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of a Frequency-Lowering Algorithm for Adults With High-Frequency Hearing Loss

2017

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The objective was to determine the effects of a frequency-lowering algorithm (frequency composition, Fcomp) on consonant identification, word-final /s, z/ detection, the intelligibility of sentences in noise, and subjective benefit, for people with high-frequency hearing loss, including people with dead regions (DRs) in the cochlea. A single-blind randomized crossover design was used. Performance with Bernafon Acriva 9 hearing aids was compared with Fcomp off and Fcomp on. Participants wore the hearing aids in each condition in a counterbalanced order. Data were collected after at least 8 weeks of experience with a condition. Outcome measures were audibility, scores from the speech perception tests, and scores from a questionnaire comparing self-perceived hearing ability with Fcomp off and Fcomp on. Ten adults with mild to severe high-frequency hearing loss (seven with extensive DRs, one with patchy or restricted DRs, and two with no DR) were tested. Fcomp improved the audibility of high-frequency sounds for 6 out of 10 participants. There was no overall effect of Fcomp on consonant identification, but the pattern of consonant confusions varied across conditions and participants. For word-final /s, z/ detection, performance was significantly better with Fcomp on than with Fcomp off. Questionnaire scores showed no differences between conditions. In summary, Fcomp improved word-final /s, z/ detection. No benefit was found for the other measures.

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“…For example, for people with very poor sensitivity to binaural TFS, bilaterally fitted hearing aids incorporating binaural beamforming might be appropriate. Such aids have a highly directional characteristic, increasing the speech-to-background ratio for speech coming from the front, but this comes at the cost of loss of interaural time difference (ITD) cues (Launer, Zakis and Moore 2016). The cost would be small for people whose sensitivity to binaural TFS was already very poor.…”

Section: Introductionmentioning

confidence: 99%

Development of a method for determining binaural sensitivity to temporal fine structure

Füllgrabe

Harland

Sęk

et al. 2017

International Journal of Audiology

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Objective: To develop and evaluate a test of the ability to process binaural temporal-fine-structure (TFS) information. The test was intended to provide a graded measure of TFS sensitivity for all listeners. Design: Sensitivity to TFS was assessed at a sensation level of 30 dB using the established TFS-LF test at centre frequencies of 250, 500 and 750 Hz, and using the new TFS-AF test, in which the interaural phase difference (IPD) was fixed and the frequency was adaptively varied. IPDs varied from 30 to 180. Study Sample: Nine young (19-25 years) and 23 older (47-84 years) listeners with normal hearing over the tested frequency range. Results: For the young listeners, thresholds on the TFS-AF test did not improve significantly with repeated testing. The rank-ordering of performance across listeners was independent of the size of the IPD, and moderate-to-strong correlations were observed between scores for the TFS-LF and TFS-AF tests. Older listeners who were unable to complete the TFS-LF test were all able to complete the TFS-AF test. Conclusions: No practice effects and strong correlations with an established test of binaural TFS sensitivity make the TFS-AF test a good candidate for the assessment of suprathreshold binaural processing.

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Hearing Aid Signal Processing

Cited by 36 publications

References 96 publications

Evaluation of a Method for Determining Binaural Sensitivity to Temporal Fine Structure (TFS-AF Test) for Older Listeners With Normal and Impaired Low-Frequency Hearing

Evaluation of a Method for Determining Binaural Sensitivity to Temporal Fine Structure (TFS-AF Test) for Older Listeners With Normal and Impaired Low-Frequency Hearing

Evaluation of a Frequency-Lowering Algorithm for Adults With High-Frequency Hearing Loss

Development of a method for determining binaural sensitivity to temporal fine structure

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