基于DSP的自适应滤波器的设计与实现

摘要

The design of adaptive filter system based on TMS320F28234 is discussed. In the absence of any priori knowledge of signal and noise,the adaptive filter can reach the optimal filtering purposes. According to the principle of adaptive filtering, the LMS algorithm is discussed and analyzed,which is easy to realize. By comparing the advantages and disadvantages of FIR structure and IIR structure filter,the transverse FIR structure is used for the adaptive filter. To meet real-time requirement of the adaptive filtering,TMS320F28234 chip is used in the system design. Its minimum hardware system and software system were designed. The adaptive filter was realized with TMS320F28234. The simulation results show that the filtering effect of the adaptive filter is superior.%论述了基于TMS320F28234的自适应滤波器系统的设计。自适应滤波器能够在没有任何关于信号和噪声的先验知识的条件下，达到最优滤波的目的。根据自适应滤波的原理，主要论述和分析了易于实现的最小均方差算法，通过比较IIR结构和FIR结构滤波器的优缺点，采用横向FIR结构的自适应滤波器来实现。为了满足自适应滤波的实时性要求，采用TMS320F28234芯片的系统设计，并设计了其硬件最小系统和软件系统，最后用TMS320F28234实现自适应滤波器。仿真结果表明，自适应滤波器滤波效果优越。