A Design for the Digital Butterworth Filter
Liu Li · Electrical Measurement & Instrumentation · 2006
The classical method for the digital Butterworth filter design is to work out corresponding analog filter first,then obtain the digital Butterworth filter from the bilinear transform,therefore the traditional method relies on the analog filter,and cannot obtain the zeros-poles plot equal filter.This paper introduces the general formula to design the digital Butterworth filters without the help of the analog filter,and the results are consistent after comparing with the traditional method,also designs the zeros-poles plot equal filter.The theory and the data show this method is better than the traditional design method for the digital Butterworth filter.