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在电子回声消除应用中,为提高自适应算法的收敛速度,提出一种改进的仿射投影算法及其快速实现形式.新算法利用回声路径的稀疏结构特征,通过收敛步长控制矩阵,按滤波器各系数幅值大小,等比例地为其指定相应收敛步长,以加快大系数收敛,最终达到加快滤波器整体收敛速度的目的.对新算法进行的统计学分析,为其快速收敛于目标系统的算法特性提供了理论依据.仿真实验表明与传统自适应算法相比,新算法能减小稳态失调并大幅提高收敛速度,其低计算复杂度亦保证了系统的实时性. 相似文献
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The reconstruction of background noise from an error signal of an adaptive filter is a key is-sue for developing Variable Step-Size Normalized Least Mean Square (VSS-NLMS) algorithm in the context of Echo Cancellation (EC). The core param-eter in this algorithm is the Background Noise Pow-er (BNP ); in the estimation of BNP, the power difference between the desired signal and the filter output, statistically equaling to the error signal pow-er, has been widely used in a rough manner. In this study, a precise BNP estimate is implemented by multiplying the rough estimate with a corrective factor, taking into consideration the fact that the er-ror signal consists of background noise and mis-alignment noise. This corrective factor is obtained by subtracting half of the latest VSS value from 1 after analyzing the ratio of BNP to the misalignment noise. Based on the precise BNP estimate, the PVSS-NLMS algorithm suitable for the EC system is eventually proposed. In practice, the proposed al-gorithm exhibits a significant advantage of easier controllability application, as prior knowledge of the EC environment can be neglected. The simula-tion results support the preciseness of the BNP esti-mation and the effectiveness of the proposed algo-rithm. 相似文献
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针对周期信号分析中的频谱泄漏问题,本文就目前国际上的研究状况和趋势进行了简单地介绍,提出了重新定位取样序列的同步化方法,推导出了同步化取样序列坐标的定位公式.比较详细地讨论了线性、二阶和四阶同步化算法,并对它们的理论截断误差进行了分析.通过对不同谐波形式的仿真信号的同步化运算和误差分析,获得了线性同步化算法的理论和实际误差特性,以及二阶抛物同步化算法和四阶前插同步化算法的实际误差特性.误差分析的结果表明,这种非同步取样数据的同步化算法,具有良好的同步效果,不仅可应用于稳态周期信号,也适用于周期性非稳态过程信号的测量和分析. 相似文献
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