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Enhanced Beam-Steering-Based Diagonal Beamforming Algorithm for Binaural Hearing Support Devices

机译:用于双耳助听器的基于波束导向的增强对角波束形成算法

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摘要

In order to improve speech intelligibility for hearing-impaired people in various listening situations, it is necessary to diversify the possible focusing directions of a beamformer. In a previous report, the concept of binaural beam-steering that can focus a beamformer in diagonal directions was applied to a binaural hearing aid; however, in the previously proposed protocol, the effective frequency range for consistent diagonal beam-steering was limited to the 200-750Hz range, which is far narrower than that of normal speech signals (200-4000Hz). In this study, we proposed a modified binaural diagonal beam-steering technique that can reduce the focusing-direction deviations at high input frequencies up to 4000Hz by introducing a new correction factor to the original protocol that can reduce the differences in gradient between the signal and the noise components at frequencies up to 4000Hz. In simulation tests, the focusing effect of the proposed algorithm was more consistent than conventional algorithms. The deviations between the target and the focusing directions were reduced 27% in the left device and 6% in the right device with 45° steering at a 4000Hz input signal, and were reduced 3% in the left device and 25% in the right device with 135° steering. On the basis of the experimental results, we believe that the proposed algorithm has the potential to help hearing-impaired people in various listening situations.
机译:为了提高在各种聆听情况下听障人士的语音清晰度,有必要使波束形成器的可能聚焦方向多样化。在以前的报告中,可以将波束形成器聚焦在对角线方向上的双耳波束转向概念被应用于双耳助听器。然而,在先前提出的协议中,用于一致的对角线束转向的有效频率范围被限制在200-750Hz的范围内,该范围远小于正常语音信号(200-4000Hz)的范围。在这项研究中,我们提出了一种改进的双耳对角线束转向技术,该技术可以通过在原始协议中引入新的校正因子来减少信号与信号之间的梯度差异,从而减小高达4000Hz的高输入频率时聚焦方向的偏差。频率高达4000Hz时的噪声成分。在仿真测试中,所提出算法的聚焦效果比常规算法更加一致。在输入信号为4000Hz的情况下,在45°转向下,左侧设备的目标方向与聚焦方向的偏差减小了27%,右侧设备中的偏差减小了6%,左侧设备中的目标方向和聚焦方向的偏差减小了3%,右侧设备中的偏差减小了25% 135°转向。根据实验结果,我们认为所提出的算法具有在各种听力情况下帮助听障人士的潜力。

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