Further improvements in digitizing continuous-time filters

Author

Wan, Chunxi ; Schneider, Alan M.

Author_Institution

Beijing Inst. of Technol., China

Volume

45

Issue

3

fYear

1997

fDate

3/1/1997 12:00:00 AM

Firstpage

533

Lastpage

542

Abstract

A new method for digitizing a linear continuous-time filter has improved stability characteristics and reduced implementation requirements while retaining the accuracy of the higher order rules recently appearing in the literature. This method approximates the sampled input by a polynomial of degree q fitted to the latest (q+1) samples. The value of q is selected by the designer; values of q up to 14 have been tested successfully. The exact response of the original continuous-time filter to the polynomial input is computed analytically. The method has been formulated using matrices, which lends itself well to machine computation and greatly simplifies the effort needed to obtain numerical results

Keywords

continuous time filters; digital filters; discrete time filters; filtering theory; numerical stability; polynomial matrices; digitizing continuous-time filters; discrete-time filter; higher order rules; implementation requirements; linear continuous-time filter; machine computation; matrices; numerical results; polynomial; sampled input; stability characteristics; Analog computers; Computational modeling; Computer simulation; Matrix converters; Nonlinear filters; Polynomials; Power engineering and energy; Stability; Testing; Transfer functions;

fLanguage

English

Journal_Title

Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1053-587X

Type

jour

DOI

10.1109/78.558466

Filename

558466