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首页> 外文期刊>The Journal of the Acoustical Society of America >Adaptive feedback cancellation in hearing aids with clipping in the feedback path
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Adaptive feedback cancellation in hearing aids with clipping in the feedback path

机译：助听器中的自适应反馈消除和反馈路径限制

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摘要

Adaptive linear filtering algorithms are commonly used to cancel feedback in hearing aids. The use of these algorithms is based on the assumption that the feedback path is linear, so nonlinearities in the feedback path may affect performance. This study investigated the effect on feedback canceller performance of clipping of the feedback signal arriving at the microphone, as well as the benefit of applying identical clipping to the cancellation signal so that the cancellation path modeled the nonlinearity of the feedback path. Feedback signal clipping limited the amount of added stable gain that the feedback canceller could provide, and caused misadjustment in response to high-level inputs, by biasing adaptive filter coefficients toward lower magnitudes. Cancellation signal clipping mitigated these negative effects, permitting higher amounts of added stable gain and less misadjustment in response to high-level inputs, but the benefit was reduced in the presence of the highest-level inputs. (C) 2008 Acoustical Society of America.
机译：自适应线性滤波算法通常用于消除助听器中的反馈。这些算法的使用基于以下假设：反馈路径为线性，因此反馈路径中的非线性可能会影响性能。这项研究调查了到达麦克风的反馈信号的削波对反馈抵消器性能的影响，以及对抵消信号应用相同削波的好处，以便抵消路径可以模拟反馈路径的非线性。反馈信号削波限制了反馈消除器可以提供的增加的稳定增益量，并通过将自适应滤波器系数偏向较低的幅度而导致响应于高电平输入而导致失调。抵消信号削波减轻了这些负面影响，允许增加更多的稳定增益，并减少响应于高电平输入的失调，但是，在存在高电平输入的情况下，其好处会降低。 （C）2008年美国声学学会。

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