On Mitigating Acoustic Feedback in Hearing Aids with Frequency Warping by All-Pass Networks.
On Mitigating Acoustic Feedback in Hearing Aids with Frequency Warping by All-Pass Networks.
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DOI：
10.21437/interspeech.2019-3195
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发表时间：
2019-09
期刊：
影响因子：
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通讯作者：
Garudadri H
中科院分区：
文献类型：
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作者：
Lee CH;Chen KL;Harris F;Rao BD;Garudadri H
由于高级助听器（HA）和可听设备中出现的形状因素，声反馈控制仍然是一个具有挑战性的问题。在本文中，我们提出了一种新颖的使用著名的全通滤波器在网络中进行频率弯曲，我们称之为“freping。”Freping有助于打破奈奎斯特稳定性标准，并改善自适应反馈消除（AFC）。根据非正式的主观评估，由于微动引起的失真是相当良性的。虽然常见的客观指标，如语音质量的感知评估（PESQ）和助听器语音质量指数（HASQI）可能无法从感知的角度充分捕获由于freping和声反馈伪影造成的失真，但它们在评估所提出的方法时仍然具有指导意义。我们展示了在增益设置为20时基本AFC（PESQ：2.56至3.52和HASQI：0.65至0.78）的freping质量改进;以及增益为30时高级AFC（PESQ：2.75至3.17和HASQI：0.66至0.73）。从我们的调查，freping提供了更大的改善基本AFC，但仍然提高了许多AFC方法的整体系统性能。
Acoustic feedback control continues to be a challenging problem due to the emerging form factors in advanced hearing aids (HAs) and hearables. In this paper, we present a novel use of well-known all-pass filters in a network to perform frequency warping that we call “freping.” Freping helps in breaking the Nyquist stability criterion and improves adaptive feedback cancellation (AFC). Based on informal subjective assessments, distortions due to freping are fairly benign. While common objective metrics like the perceptual evaluation of speech quality (PESQ) and the hearing-aid speech quality index (HASQI) may not adequately capture distortions due to freping and acoustic feedback artifacts from a perceptual perspective, they are still instructive in assessing the proposed method. We demonstrate quality improvements with freping for a basic AFC (PESQ: 2.56 to 3.52 and HASQI: 0.65 to 0.78) at a gain setting of 20; and an advanced AFC (PESQ: 2.75 to 3.17 and HASQI: 0.66 to 0.73) for a gain of 30. From our investigations, freping provides larger improvement for basic AFC, but still improves overall system performance for many AFC approaches.