Design methods for periodically time varying digital filters

Author

Critchley, Jane ; Rayner, P.J.W.

Author_Institution

Time & Space Process., Santa Clara, CA, USA

Volume

36

Issue

5

fYear

1988

fDate

5/1/1988 12:00:00 AM

Firstpage

661

Lastpage

673

Abstract

A theoretical analysis of periodically time-varying (PTV) filters for use in filter banks for TDM/FDM transmultiplexing is presented. The PTV filter simulates the response of a parallel bank of time-invariant filters with their outputs connected to a rotating switch. This analysis leads to a different equation form for a PTV filter that is closely related to a time-invariant companion filter. Design methods in both the time and frequency domains are described, and results are presented. A 12-channel transmultiplexer requiring 3.24×10⁶ multiplications/s is designed, using filters implemented in a polyphase-type structure

Keywords

digital filters; filtering and prediction theory; frequency division multiplexing; time division multiplexing; PTV filter; TDM/FDM transmultiplexing; parallel bank; periodically time varying digital filters; polyphase-type structure; time-invariant companion filter; Band pass filters; Channel bank filters; Design methodology; Difference equations; Digital filters; Filter bank; Frequency; Switches; Time division multiplexing; Transversal filters;

fLanguage

English

Journal_Title

Acoustics, Speech and Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

0096-3518

Type

jour

DOI

10.1109/29.1576

Filename

1576