A direct approach to the design of multidimensional PCAS digital filters satisfying gain and group delay specifications simultaneously

Author

Anderson, Martin ; Lawson, Stuart

Author_Institution

Dept. of Eng., Warwick Univ., Coventry, UK

fYear

1993

fDate

11/2/1993 12:00:00 AM

Firstpage

42430

Lastpage

42433

Abstract

Digital filters with linear or almost linear phase are required in many applications including video, sonar and image processing. A direct design approach is reported here which can be applied to 1-D and M-D filter design so long as the filter structure is a parallel combination of allpass subfilters (PCAS). PCAS filters are used because of their low complexity and roundoff noise as well as their ability to realise non-minimum phase transfer functions. The filter design will be shown to reduce to the solution of two sets of linear simultaneous equations. Examples are given in both the 1-D and 2-D case to illustrate the method

Keywords

all-pass filters; multidimensional digital filters; network synthesis; parallel architectures; roundoff errors; transfer functions; 1D filters; 2D filters; allpass subfilters; filter structure; gain specifications; group delay specifications; linear phase; linear simultaneous equations; low complexity; multidimensional PCAS digital filters; non-minimum phase transfer functions; parallel combination; roundoff noise;

fLanguage

English

Publisher

iet

Conference_Titel

Digital and Analogue Filters and Filtering Systems, IEE Colloquium on

Type

conf

Filename

287357