Design of PCAS Filters Approximating Multi-level Responses
نویسنده
چکیده
Multi-level Responses Martin Anderson and Steve Summer eld University of Warwick Coventry CV4 7AL UK (+44) 1203 523780 [email protected] Abstract This paper considers the design of various lters composed of allpass sub lters approximatingmulti-band,multi-level responses. These include M-level PCAS lters, tree structures of half-band recursive lters and cosinemodulated allpass-based lter banks. Design methods for designing the allpass sub lters in terms of phase are given. It is also shown how to obtain good linear phase across the entire frequency band by modifying the sublter phase behaviour of the prototype recursive N th band lter.
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