Hybrid multi-harmonic model for the prediction of interaural time differences in individual behind-the-ear hearing-aid-related transfer functions

IF 1 3区 物理与天体物理 Q4 ACOUSTICS Acta Acustica Pub Date : 2022-01-01 DOI:10.1051/aacus/2022020
Florian Pausch, S. Doma, J. Fels
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引用次数: 1

Abstract

Spatial sound perception in aided listeners partly relies on hearing-aid-related transfer functions (HARTFs), describing the directional acoustic paths between a sound source and the hearing-aid (HA) microphones. Compared to head-related transfer functions (HRTFs), the HARTFs of behind-the-ear HAs exhibit substantial differences in spectro-temporal characteristics and binaural cues such as interaural time differences (ITDs). Since assumptions on antipodal microphone placement on the equator of a three-concentric sphere are violated in such datasets, predicting the ITDs via Kuhn’s simple analytic harmonic model entails excessive errors. Although angular ear-canal offsets have been addressed in an extended Woodworth model, the prediction errors remain large if the frequency range does not comply with the model specifications. Tuned to the previously inaccurately modelled frequency range between 500 Hz and 1.5 kHz, we propose a hybrid multi-harmonic model to predict the ITDs in HRTFs and HARTFs for arbitrary directions in the horizontal plane with superior accuracy. The target model coefficients are derived from individual directional measurements of 30 adults, wearing two dual-microphone behind-the-ear HAs and two in-ear microphones. Model individualisation is facilitated by the availability of polynomial weights that are applied to subsets of individual anthropometric and HA features to estimate the target model coefficients. The model is published as part of the Auditory Modeling Toolbox (AMT, pausch2022) and supplemented with the individual features and directional datasets.
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混合多谐模型用于预测个体耳后助听器相关传递函数的耳间时差
辅助听者的空间声音感知部分依赖于助听器相关的传递函数(HARTFs),描述声源和助听器(HA)麦克风之间的定向声路径。与头部相关传递函数(hrtf)相比,耳后ha的HARTFs在光谱-时间特征和双耳信号(如耳间时差(ITDs))方面表现出实质性差异。由于这些数据集违背了对跖传声器放置在三同心球赤道上的假设,因此通过库恩的简单解析调和模型预测过渡段会带来很大的误差。虽然在扩展的Woodworth模型中已经解决了耳道角偏移问题,但如果频率范围不符合模型规范,预测误差仍然很大。在500 Hz到1.5 kHz的频率范围内,我们提出了一种混合多谐波模型,可以在水平面上任意方向上预测hrtf和HARTFs中的过渡段,具有较高的精度。目标模型系数来自30名成年人的个人方向测量,他们戴着两个双麦克风耳后麦克风和两个入耳式麦克风。将多项式权重应用于个体人体测量和HA特征的子集以估计目标模型系数,从而促进了模型个性化。该模型作为听觉建模工具箱(AMT, pausch2022)的一部分发布,并补充了个人特征和定向数据集。
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来源期刊
Acta Acustica
Acta Acustica ACOUSTICS-
CiteScore
2.80
自引率
21.40%
发文量
0
审稿时长
12 weeks
期刊介绍: Acta Acustica, the Journal of the European Acoustics Association (EAA). After the publication of its Journal Acta Acustica from 1993 to 1995, the EAA published Acta Acustica united with Acustica from 1996 to 2019. From 2020, the EAA decided to publish a journal in full Open Access. See Article Processing charges. Acta Acustica reports on original scientific research in acoustics and on engineering applications. The journal considers review papers, scientific papers, technical and applied papers, short communications, letters to the editor. From time to time, special issues and review articles are also published. For book reviews or doctoral thesis abstracts, please contact the Editor in Chief.
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