Polyphase filter banks using wave digital filters
1981 (English)In: IEEE Transaction on Acoustics, Speech and Signal Processing, ISSN 0096-3518, Vol. 29, no 3, 423-428 p.Article in journal (Refereed) Published
The branch filters in a digital polyphase network can be designed either as FIR filters by decomposing the impulse response of an FIR low-pass prototype filter, or as o r d i i IIR filters by the synthesis method of Bellanger. The use of all-pass networks has hitherto been considered unfeasible because of the associated computational difficulties involved in the design of filter banks with many branches. The purpose of this paper is to demonstrate that it is indeed possible to design the branch filters as all-pass-low-pass sections without the need of a prototype filter. Moreover, these sections can be realized as wave digital filters, which give improved properties over the other designs with respect to hardware requirements, group delay, sensitivity, dynamics and limit cycles. Examples, including the design of the practically important 60-channel filter bank for the transmultiplexer, are given
Place, publisher, year, edition, pages
IEEE , 1981. Vol. 29, no 3, 423-428 p.
wave digital filters, optimization, transmultiplexer
IdentifiersURN: urn:nbn:se:liu:diva-111409DOI: 10.1109/TASSP.1981.1163574OAI: oai:DiVA.org:liu-111409DiVA: diva2:756252