Generalized Digital Butterworth Filter Design
(FIR and IIR)

Lowpass digital Butterworth filter design. An arbitrary numerator and denominator degree, and a desired half-magnitude frequency can be specified. The filter produced by the program has a magnitude squared frequency response that is maximally flat at w=0 and at w=pi.

• Example
• Documentation
• Download programs
• A Matlab graphical user interface (GUI) for generalized Butterworth filter design. (The file names have no more than 8 characters, for DOS people).

Please direct comments and questions to I. W. Selesnick (selesi@ece.rice.edu).

For more details see: I. W. Selesnick and C. S. Burrus, Generalized Digital Butterworth Filter Design , Submitted to IEEE Trans. on Signal Processing. Abstract.