基于DSP的IIR低通数字滤波器的设计与实现

Design and Implementation of IIR Low-Pass Digital Filter Based on DSP

针对数据采集过程中经常会引入高频干扰,系统利用Matlab的滤波器设计工具FDAtool设计了一种IIR低通数字滤波器,求得滤波器系数。在CCS环境下编写了IIR滤波器汇编程序,并采用TI公司的定点DSP TMS320C5402作为核心芯片实现该滤波算法。滤波结果表明,滤波后通带内的信号保存完整,而高频干扰基本被滤除,滤波效果良好,具有一定的实用价值。

For the high-frequency interference appearing in the data acquisition process, an IIR low-pass digital filter is designed and the filter coefficients are obtained by the Matlab tool FDAtool. The IIR filter assembler is written in the CCS environment and the filtering algorithm is implemented in TI＇s fixed-point DSP TMS320C5402. The filtering results show that the signal is stored within the pass band after filtering, the high frequency interference is filtered, the filtering effect is good and the system has some practical value.