Limitations of theoretical benefit from an adaptive directional system in reverberant environments

W. S. Woods, T. Trine
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引用次数: 7

Abstract

Hearing aids with adaptive and fixed two-microphone processing are currently available. Although the noise reduction increase of adaptive over fixed aids can theoretically be tens of dB, it is unclear if this benefit can be found with realistic processing and conditions. Thus, a theoretical analysis of the ability of today’s aids to attenuate jammers in “everyday” conditions [direct-reverberant ratio ⩽5.0 dB] is provided. Processing limitations restrict aids to wideband null steering through intermicrophone delay variation. Delay variation is predicted to provide maximally 2.0 dB more noise reduction than the best fixed system on average, and only at the highest direct-reverberant ratios.
混响环境下自适应定向系统理论效益的局限性
目前可提供自适应和固定双麦克风处理的助听器。虽然从理论上讲,自适应辅助设备的降噪效果比固定辅助设备可提高数十dB,但目前尚不清楚在实际处理和条件下是否能发现这种好处。因此,提供了在“日常”条件下(直接混响比≤5.0 dB)衰减干扰器的能力的理论分析。处理的局限性限制了通过传声器间延迟变化来实现宽带零导向的帮助。预计延迟变化比最佳固定系统平均提供最多2.0 dB的降噪,并且仅在最高的直接混响比下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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