摘要
在回声消除中,自适应滤波是核心,而滤波器系数的更新又是自适应滤波的核心.在声学回声消除领域,滤波器系数的更新最常使用的算法是LMS算法,目前针对LMS算法有两种改进算法,即NLMS和NBLMS算法.基于TI公司的DSP芯片的硬件资源特点来比较NLMS(NormalizedLMS)和NBLMS(NormalizedBlockUpdateLMS)算法,为消除声学回声提供选择依据.
In acoustic echo-canceling procedure, adaptive filter is the key point. And the updating of filter coefficient plays the most important role in adaptive filter. In the area of acoustic echo canceling, the traditional way used in updating of filter coefficient is LMS algorithm. There are two improved algorithms from LMS——NLMS and NBLMS. This article compares the two algorithms from the perspective of hardware characteristics of DSP produced by TI, it will supply a selection gist for acoustics echo canceling.
