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Objective analysis of higher-order Ambisonics sound-field reproduction for hearing aid applications

机译:用于助听器的高阶Ambisonics声场再现的客观分析

摘要

The evaluation of hearing aids (HAs) inside realistic sound environments is of increasing interest. Higher-order Ambisonics (HOA) has been used for loudspeaker-based sound field resynthesis and HOA recording microphone arrays are available. Although HOA has been evaluated perceptually, it is unclear how far the results can be transferred to evaluating HA technologies (particularly multi-microphone enhancement algorithms). In order to determine the minimum HOA order required for HA testing, an HOA framework was developed, simulating the entire path from sound presented in a room, picked up by a microphone array, decoded and received at the ears of a HA-fitted dummy head. HA directivity patterns were compared between an ideal free-field and its HOA representation to evaluate the introduced error. In-room analysis was conducted to investigate the bandwidth and performance of a directional microphone in realistic situations. For a bandwidth B, the required order was found to be M≥B/600Hz for the anechoic (worst) case scenario. The presence of reverberation introduced natural room response variations across different source-receiver locations, suggesting that the acceptable HOA error can be increased. Hence, in reverberant environments the required HOA order is reduced and at least 2D HOA reproduction can be used for evaluation of HA technologies.
机译:在逼真的声音环境中评估助听器(HAs)的兴趣日益浓厚。高阶Ambisonics(HOA)已用于基于扬声器的声场再合成,并且提供了HOA记录麦克风阵列。尽管已对HOA进行了感知评估,但尚不清楚将结果转移到评估HA技术(尤其是多麦克风增强算法)的程度。为了确定进行HA测试所需的最低HOA顺序,开发了一个HOA框架,该模拟过程模拟了房间中呈现的声音,麦克风阵列拾取的声音的完整路径,并在装有HA的虚拟头的耳朵处进行解码和接收。在理想的自由场及其HOA表示之间比较了HA方向性模式,以评估引入的误差。在室内进行了分析,以研究在实际情况下定向麦克风的带宽和性能。对于带宽B,对于无回声(最坏)情况,发现所需的阶数为M≥B/ 600Hz。混响的存在在不同的源接收器位置之间引入了自然的房间响应变化,这表明可以增加可接受的HOA误差。因此,在混响环境中,降低了所需的HOA顺序,并且至少可以使用2D HOA再现来评估HA技术。

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