A Maximally Flat Group Delay Recursive Digital Filter with Chebyshev Stopband Attenuation

Due to the monotonically decaying nature of its magnitude response, an all-pole recursive digital filter, with its group delay approximating a prescribed constant value, does not exhibit a sharp transition band. Using transformation as the mathematical means, this correspondence describes a design technique for a recursive digital filter with a maximally flat group delay and a Chebyshev attenuation stopband. Copyright © 1978 by The Institute of Electrical and Electronics Engineers, Inc.