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Speech reception with different bilateral directional processing schemes: Influence of binaural hearing, audiometric asymmetry, and acoustic scenario.
Hear Res. 2017 09; 353:36-48.HR

Abstract

Hearing aid (HA) users can differ markedly in their benefit from directional processing (or beamforming) algorithms. The current study therefore investigated candidacy for different bilateral directional processing schemes. Groups of elderly listeners with symmetric (N = 20) or asymmetric (N = 19) hearing thresholds for frequencies below 2 kHz, a large spread in the binaural intelligibility level difference (BILD), and no difference in age, overall degree of hearing loss, or performance on a measure of selective attention took part. Aided speech reception was measured using virtual acoustics together with a simulation of a linked pair of completely occluding behind-the-ear HAs. Five processing schemes and three acoustic scenarios were used. The processing schemes differed in the tradeoff between signal-to-noise ratio (SNR) improvement and binaural cue preservation. The acoustic scenarios consisted of a frontal target talker presented against two speech maskers from ±60° azimuth or spatially diffuse cafeteria noise. For both groups, a significant interaction between BILD, processing scheme, and acoustic scenario was found. This interaction implied that, in situations with lateral speech maskers, HA users with BILDs larger than about 2 dB profited more from preserved low-frequency binaural cues than from greater SNR improvement, whereas for smaller BILDs the opposite was true. Audiometric asymmetry reduced the influence of binaural hearing. In spatially diffuse noise, the maximal SNR improvement was generally beneficial. N0Sπ detection performance at 500 Hz predicted the benefit from low-frequency binaural cues. Together, these findings provide a basis for adapting bilateral directional processing to individual and situational influences. Further research is needed to investigate their generalizability to more realistic HA conditions (e.g., with low-frequency vent-transmitted sound).

Authors+Show Affiliations

Medizinische Physik and Cluster of Excellence "Hearing4all", Dept. of Medical Physics and Acoustics, Carl-von-Ossietzky University, D-26111 Oldenburg, Germany. Electronic address: tneher@health.sdu.dk.Hörzentrum Oldenburg GmbH, Marie-Curie-Str. 2, D-26129 Oldenburg, Germany. Electronic address: k.wagener@hoerzentrum-oldenburg.de.Phonak AG, Laubisrütistrasse 28, CH-8712 Stäfa, Switzerland. Electronic address: matthias.latzel@phonak.com.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

28783570

Citation

Neher, Tobias, et al. "Speech Reception With Different Bilateral Directional Processing Schemes: Influence of Binaural Hearing, Audiometric Asymmetry, and Acoustic Scenario." Hearing Research, vol. 353, 2017, pp. 36-48.
Neher T, Wagener KC, Latzel M. Speech reception with different bilateral directional processing schemes: Influence of binaural hearing, audiometric asymmetry, and acoustic scenario. Hear Res. 2017;353:36-48.
Neher, T., Wagener, K. C., & Latzel, M. (2017). Speech reception with different bilateral directional processing schemes: Influence of binaural hearing, audiometric asymmetry, and acoustic scenario. Hearing Research, 353, 36-48. https://doi.org/10.1016/j.heares.2017.07.014
Neher T, Wagener KC, Latzel M. Speech Reception With Different Bilateral Directional Processing Schemes: Influence of Binaural Hearing, Audiometric Asymmetry, and Acoustic Scenario. Hear Res. 2017;353:36-48. PubMed PMID: 28783570.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Speech reception with different bilateral directional processing schemes: Influence of binaural hearing, audiometric asymmetry, and acoustic scenario. AU - Neher,Tobias, AU - Wagener,Kirsten C, AU - Latzel,Matthias, Y1 - 2017/07/29/ PY - 2017/03/31/received PY - 2017/07/21/revised PY - 2017/07/25/accepted PY - 2017/8/8/pubmed PY - 2018/5/22/medline PY - 2017/8/8/entrez KW - Binaural hearing KW - Directional processing KW - Hearing aids KW - Hearing impairment KW - Individual differences KW - Speech reception SP - 36 EP - 48 JF - Hearing research JO - Hear Res VL - 353 N2 - Hearing aid (HA) users can differ markedly in their benefit from directional processing (or beamforming) algorithms. The current study therefore investigated candidacy for different bilateral directional processing schemes. Groups of elderly listeners with symmetric (N = 20) or asymmetric (N = 19) hearing thresholds for frequencies below 2 kHz, a large spread in the binaural intelligibility level difference (BILD), and no difference in age, overall degree of hearing loss, or performance on a measure of selective attention took part. Aided speech reception was measured using virtual acoustics together with a simulation of a linked pair of completely occluding behind-the-ear HAs. Five processing schemes and three acoustic scenarios were used. The processing schemes differed in the tradeoff between signal-to-noise ratio (SNR) improvement and binaural cue preservation. The acoustic scenarios consisted of a frontal target talker presented against two speech maskers from ±60° azimuth or spatially diffuse cafeteria noise. For both groups, a significant interaction between BILD, processing scheme, and acoustic scenario was found. This interaction implied that, in situations with lateral speech maskers, HA users with BILDs larger than about 2 dB profited more from preserved low-frequency binaural cues than from greater SNR improvement, whereas for smaller BILDs the opposite was true. Audiometric asymmetry reduced the influence of binaural hearing. In spatially diffuse noise, the maximal SNR improvement was generally beneficial. N0Sπ detection performance at 500 Hz predicted the benefit from low-frequency binaural cues. Together, these findings provide a basis for adapting bilateral directional processing to individual and situational influences. Further research is needed to investigate their generalizability to more realistic HA conditions (e.g., with low-frequency vent-transmitted sound). SN - 1878-5891 UR - https://www.unboundmedicine.com/medline/citation/28783570/Speech_reception_with_different_bilateral_directional_processing_schemes:_Influence_of_binaural_hearing_audiometric_asymmetry_and_acoustic_scenario_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0378-5955(17)30119-3 DB - PRIME DP - Unbound Medicine ER -