کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
565149 875679 2006 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Orthogonalized power filters for nonlinear acoustic echo cancellation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر پردازش سیگنال
پیش نمایش صفحه اول مقاله
Orthogonalized power filters for nonlinear acoustic echo cancellation
چکیده انگلیسی

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Signal Processing - Volume 86, Issue 6, June 2006, Pages 1168–1181
نویسندگان
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