基于TMS320C5402的FIR数字滤波器的设计

Design of FIR Digital Filter Based on TMS320C5402

DSP由于其本身具有并行的硬件乘法器、流水结构以及快速的片内存储器等资源,其技术已广泛地应用于数字信号处理的各个领域。本文主要研究了FIR滤波器的窗函数算法的基本思想及在定点DSP芯片上实现FIR数字滤波器设计方法,讨论了在具体实现时如何提高数字滤波器的计算精度和防止输出结果溢出问题,最后给出在C54系列DSK进行验证的程序和滤波前后的时域、频域的对比图。实践证明,该滤波器准确度高、稳定性好,易于移植使用,具有较强的实用性与灵活性。

DSP has advantaged construction with parallel hardware multiplier, pipeline structure and flash memory, it has been applied in various fields of digital signal processing. This paper studies the algorithm about FIR digital filter and design method is realized with fixed point DSP, discusses the problem that how to improve digital filter precision and prevent output overflow in realization. Finally it gives the program validated in C54 series DSK and the figure contrast between time domain and frequency domain. The filter has superiority of high precision, good stability, easy replanting, practicability and flexibility.