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Orthogonalized power filters for nonlinear acoustic echo cancellation

机译:正交功率滤波器,用于非线性声学回声消除

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摘要

Standard approaches for the cancellation of acoustic echoes in telecommunication systems assume that the echo path to be identified can be modeled by a linear system. However, in applications such as echo cancellation for mobile communication terminals, non-negligible nonlinear distortions are introduced by loudspeakers and their amplifiers, resulting in a significant degradation of the performance of purely linear approaches. In this contribution we consider so-called power filters in order to cope with these kinds of nonlinear echo paths. By combining time-domain orthogonalization methods with a DFT-domain implementation of power filters we derive corresponding quasi-complete orthogonalized versions. As the statistical properties of speech input are non-stationary, the orthogonalization must follow this time-variance, too. Furthermore, we introduce a step-size control for the adaptation of the equivalent orthogonalized structure. Experiments with real hardware show that, with the proposed nonlinear approach, an increase in echo attenuation can be achieved, if the loudspeaker system introduces saturation-type nonlinearities in the echo path. (c) 2005 Elsevier B.V. All rights reserved.
机译:用于消除电信系统中的回声的标准方法假定可以通过线性系统对要识别的回声路径进行建模。但是,在诸如移动通信终端的回声消除之类的应用中,扬声器及其放大器引入了不可忽略的非线性失真,导致纯线性方法的性能大大降低。在这一贡献中,我们考虑了所谓的功率滤波器,以应对这类非线性回波路径。通过将时域正交化方法与电源滤波器的DFT域实现相结合,我们得出了相应的准完全正交化版本。由于语音输入的统计属性是不稳定的,因此正交化也必须遵循此时变。此外,我们引入了步长控制,以适应等效正交化结构。使用实际硬件进行的实验表明,如果扬声器系统在回声路径中引入了饱和类型的非线性,则使用所提出的非线性方法,可以实现回声衰减的增加。 (c)2005 Elsevier B.V.保留所有权利。

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