Title :
Roundoff-noise shaping in filter design
Author :
Constantinides, G.A. ; Cheung, P.Y.K. ; Luk, W.
Author_Institution :
Dept. of Electr. & Electron. Eng., Imperial Coll., London, UK
Abstract :
This paper presents a technique for the spectral shaping of roundoff noise in fixed-point implementations of digital filters. An automated feasibility test is introduced, in order to decide whether a given filter realisation meets user-specified constraints on the roundoff noise power spectrum. This feasibility test is used by an algorithm for optimization of individual signal widths within a filter structure. Some results are presented, illustrating how the optimization produces filters closely meeting the specification, leading to significant improvements in implementation area
Keywords :
digital filters; fixed point arithmetic; roundoff errors; automated feasibility test; digital filters; filter design; fixed-point implementations; individual signal widths; power spectrum; roundoff-noise shaping; spectral shaping; user-specified constraints; Automatic testing; Constraint optimization; Digital filters; Educational institutions; Flow graphs; High level synthesis; Noise shaping; Polynomials; Power engineering computing; Signal to noise ratio;
Conference_Titel :
Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on
Conference_Location :
Geneva
Print_ISBN :
0-7803-5482-6
DOI :
10.1109/ISCAS.2000.858687
