DESIGN OF POLYPHASE WAVE DIGITAL FILTERS WITH APPROXIMATELY LINEAR PHASE

It is well known that IIR digital filters require quite fewer computations,comparedwith FIR filters,in order to meet stringent magnitude specifications when the phase distortioncan be tolerated.An approximately linear phase,however,can be also obtained with the IIRfilter by making use of a technique without increasing the complexity.Based on a certain numberof attenuation zeros in the pass band,a new approach is developed for the design of polyphasewave digital filters with exact magnitude responses and Chebyshev approximation of the desiredphase responses.The minimum number of attenuation zeros is estimated,and some examples areincluded.

Design of polyphase wave digital filters with approximately linear phase

It is well known that IIR digital filters require quite fewer computations,compared with FIR filters,in order to meet stringent magnitude specifications when the phase distortion can be tolerated.An approximately linear phase,however,can be also obtained with the IIR filter by making use of a technique without increasing the complexity.Based on a certain number of attenuation zeros in the pass band,a new approach is developed for the design of polyphase wave digital filters with exact magnitude responses and Chebyshev approximation of the desired phase responses.The minimum number of attenuation zeros is estimated,and some examples are included.