Title :
Design methods for periodically time varying digital filters
Author :
Critchley, Jane ; Rayner, P.J.W.
Author_Institution :
Time & Space Process., Santa Clara, CA, USA
fDate :
5/1/1988 12:00:00 AM
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;
Journal_Title :
Acoustics, Speech and Signal Processing, IEEE Transactions on
