Design of minimum-phase finite-impulse-response digital filters
- 1 January 1977
- journal article
- Published by Institution of Engineering and Technology (IET) in Proceedings of the Institution of Electrical Engineers
- Vol. 124 (8) , 665-668
- https://doi.org/10.1049/piee.1977.0144
Abstract
A method is presented which can be used for the direct design of minimum-phase finite-impulse-response digital filters with arbitrary prescribed modulus-squared characteristics. This method uses the Fletcher-Powell optimisation technique to minimise an L2p norm to obtain a nonnegative polynomial fit to the desired characteristics in a transformed domain. The coefficients of the filter are then obtained from the zeros of this polynomial. Examples of lowpass and bandpass filter designs are given using an L20 norm. A comparison of the passband and stopband ripples and their ratio is made with linear-phase filter designs.Keywords
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