改进的IIR滤波器避免运算溢出和定点DSP的实现

Improved IIR Filters to Avoid Calculating Overflow and Fixed-point DSP Realization

数字滤波器的设计是数字信号处理(DSP)领域的一个重要部分。在用定点DSP器件设计数字滤波器时,一个重要的问题,就是由于硬件字长精度有限,运算会出现溢出,因此在选择恰当的滤波器的定标参数后,必须注重选取有效的结构,以保证有足够的计算精度和避免运算溢出。

Digital Filter’s design is an important field of Digital Signal Processing(DSP).Digital Filter’s design with Fixed-point DSP produces an important problem,due to hardware limited word precision to produce calculating overflow.The choice of efficient construction must be considered after selecting of proper Filter’s scaling parameter,to ensure calculation precision and avoid overflow.