多抽样率窄带 FIR 滤波器的实现

Realization of Multi Sampled Rate Narrow Band FIR Filter

主要讨论了采用ＤＳＰ芯片实现的多抽样率窄带ＦＩＲ滤波器的数据流结构和控制结构。多级结构的采用，放宽了对每一个滤波器的要求，从而降低了各级滤波器的阶数。此外，多级结构还可以降低系数灵敏度和舍入噪声。实验证明。

The data flow structure and the control structure of the multi sampled rate narrow band FIR filter by using the DSP chip are discussed.Not only there is the requirement for every filter not so strict any longer by making use of this kind of structure, thereby the power of every filter is reduced, but also the coefficient sensibility and the noise can be lowered. Besides, there is much flexibility for the data flow structure and the control structure of the FIR filter discussed in this paper.