Simulation of filter structures for fixed-point implementation

Author

Bailey, Daniel A. ; Beer, A.A.

Author_Institution

Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA

fYear

1996

fDate

31 Mar-2 Apr 1996

Firstpage

270

Lastpage

274

Abstract

We report on the development and performance evaluation of a fixed-point filter simulator for various filter structures and variable wordlength. The simulation models are based on the filter implementation in a Motorola DSP56002 fixed-point DSP. A nonlinear model of DSP56002 multiplier-accumulator including the convergent (unbiased) rounding and saturation is developed. This model is validated by comparison to the actual filter implementation on the DSP56002. These results are also compared to the linear-stochastic rounding noise model and lower bounds. Matlab simulation and automatic scaling routines where developed for the direct form high order, 2nd order cascaded and parallel sections, state-space section optimal, direct form FIR and MA lattice

Keywords

digital arithmetic; digital filters; digital signal processing chips; digital simulation; filtering theory; noise; simulation; Matlab simulation; Motorola DSP56002 fixed-point DSP; automatic scaling routines; convergent rounding; filter structure simulation; fixed-point filter model; lower bound; lower bounds; nonlinear filter; nonlinear model; saturation; state-space; variable wordlength; various filter structures; Computational modeling; Digital filters; Digital signal processing; Finite impulse response filter; Lattices; Limit-cycles; Mathematical model; Quantization; Signal to noise ratio; Stochastic resonance;

fLanguage

English

Publisher

ieee

Conference_Titel

System Theory, 1996., Proceedings of the Twenty-Eighth Southeastern Symposium on

Conference_Location

Baton Rouge, LA

ISSN

0094-2898

Print_ISBN

0-8186-7352-4

Type

conf

DOI

10.1109/SSST.1996.493512

Filename

493512