标题: | 声讯回声消除之研究 Design of Acoustic Echo Cancellation |
作者: | 林俊安 Lin, Jiunn-Ann 陈绍基 Sau-Gee Chen 电子研究所 |
关键字: | 回声消除;线性外插;echo cancellation;linear extrapolated |
公开日期: | 1996 |
摘要: | 本论文主要是对回声消除器做整体的介绍,并探讨数种适应性演算法在 回声消除器上的表现。一般的声讯回声消除器若要以有限响应滤波器实现 ,则其系数经常需要数百个或是数千个,硬体的运算量十分庞大,而且收 敛的速度也很缓慢。在本文中,我们探讨各种演算法的收敛速度,以及回 声消除的效果,并针对收敛缓慢的特性提出了外插式演算法来加快收敛速 度。最后利用计算机辅助设计工具(DSP Station)从事硬体的实作。 In this thesis, the theories of echo cancellor were studied,and the performance in terms of speed, stability and complexityof several adaptive algorithms applied to echo cancellor wereevaluated. Generally speaking, for implementing an echo cancellor,we need an FIR with hundreds and even thousands of taps. Thecomputation complexity and convergence time are huge accordingly.For solving the slow convergence problem, we propose a linearextrapolated algorithm which can improve the speed of convergence.An implementation is then given with the help of CAD tools(DSP Station). |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#NT850428068 http://hdl.handle.net/11536/61938 |
显示于类别: | Thesis |