A novel digital filter structure with minimum roundoff noise

• DOI: 10.1016/j.dsp.2009.10.018
• Publication Date: 2009-10-24T04:42:42Z
• Authors: Gang Li; Limin Meng; Zhijiang Xu; Jingyu Hua
• Keywords: Word length; Round-off error

In this paper, a novel structure is derived for efficient implementation of digital filters as well as minimizing the finite word length (FWL) errors. Such a structure is actually an improved version of that reported previously. The performance of this new structure and the famous normalized lattice structure are analyzed by deriving the corresponding expression for the roundoff noise gain. Design examples are presented to illustrate the behavior of the proposed structure and to compare it with some existing ones. It is shown that the proposed structure outperforms the others in terms of minimizing roundoff noise as well as implementation efficiency.