Design of Minimum-Phase FIR Filters with Delay Constraints

Olli Vainio and Seppo J. Ovaska
Tampere University of Technology

Abstract - The design of minimum-phase FIR filters with time-domain constraints is discussed. Two new design approaches are described, one for the white noise case and the other for frequency-selective filters. For white noise filtering, our objective is to reduce the delay of the step response of the filter, measured typically at the 50% level of the full step. An analytical filter solution is derived, giving the coefficients as a function of a single weighting parameter. For predictive filters with explicit frequency-domain specifications, a practical design approach is proposed, allowing the design of predictors with a specified stopband.