可配置参数FIR数字滤波系统设计

概述了有限冲激响应(FIR)数字滤波器的实现方法,并分析了各种方法的优缺点,设计了一个可调参数的FIR数字滤波系统.此系统由PC机根据各种滤波器指标计算出滤波参数,并对现场可编程门阵列(FPGA)芯片内部的FIR多阶滤波器进行参数配置.配置后的FPGA芯片完成具体的滤波运算,滤波后的数据通过USB2.0总线传输至PC机进行显示、分析和储存等进一步处理.在系统中采用有限状态机对FPGA参数配置模式和滤波模式进行切换,保证了系统的有序运行.通过验证实验和应用实例证明.此系统参数配置方便,滤波效果良好,迭到了设计的目的.

Reconfigurable FIR Filter System Design

Various design methods of FIR filter are summarized and their characteristics are analyzed.Then,a reconfigurablc FIR filter system is presented.According to the filter specialties,the filter coefficients are calculated by PC computer.And the configured coefficients of the multistage FIR filter are downloaded to the chip.The filter computing is completed by the FPGA.The filter data are transmitted to the computer through the USB2.0 interface for further processing,such as displaying,analyzing and storing.The state conversion between the coefficient configuring mode and the filter mode is finished by finite state machine,thus ensuring the system to work orderly.The verifying experiments and the application examples show that the coefficient configuring of the system is easy and the filter result is effective.