Method of designing polynomials for controlling the slewing of adaptive digital films

摘要

A method for deriving a polynomial for generating filter coefficients to be used in a digital filter in an electronic unit having a digital signal processor. The digital filter has a plurality of reconfigurable filter sections to achieve a desired bandwidth characteristic between a first characteristic with a first cutoff frequency and a second characteristic with a second cutoff frequency. A first set of filter coefficients is determined for providing the first characteristic. A second set of filter coefficients is determined for providing the second characteristic. A third set of filter coefficients is determined for providing a third characteristic having a third cutoff frequency between the first and second cutoff frequencies. A polynomial is determined having solutions substantially matching the first, second, and third sets of filter coefficients with respect to an index varying from a first index value to a second index value corresponding to the first cutoff frequency and the second cutoff frequency, respectively.