Abstract: A method is provided of slewing a bandwidth characteristic of a digital filter within a range between a first bandwidth characteristic and a second bandwidth characteristic. The digital filter includes a plurality of cascaded filter sections, each filter section being comprised of a second order filter having coefficients a1, a2, b0, b1, and b2. An index value is determined for identifying a desired bandwidth characteristic within the range. Values are interpolated for the coefficient values for the a1 and a2 coefficients of a respective filter section in response to the index value. Coefficient values are derived for the b0, b1, and b2 coefficients in response to the coefficient values for the a1 and a2 coefficients such that the b0, b1, and b2 coefficient values provide a matched gain for the respective filter section. The coefficient values are loaded into the respective filter section.

Abstract: A method for slewing a bandwidth characteristic of a digital filter within a range between a first bandwidth characteristic and a second bandwidth characteristic. The digital filter includes a plurality of cascaded filter sections and each of the sections has respective coefficients. The method establishes a polynomial having an order greater than or equal to two for modeling a changing value of one of the coefficients at the bandwidth characteristics within the range. An index value is determined for identifying a desired bandwidth characteristic within the range. The index value is input into the polynomial to obtain a corresponding coefficient value for the one coefficient. The coefficient value is then loaded into a respective filter section.

Abstract: 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.

Abstract: 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.

Abstract: A method for slewing a bandwidth characteristic of a digital filter within a range between a first bandwidth characteristic and a second bandwidth characteristic. The digital filter includes a plurality of cascaded filter sections and each of the sections has respective coefficients. The method establishes a polynomial having an order greater than or equal to two for modeling a changing value of one of the coefficients at the bandwidth characteristics within the range. An index value is determined for identifying a desired bandwidth characteristic within the range. The index value is input into the polynomial to obtain a corresponding coefficient value for the one coefficient. The coefficient value is then loaded into a respective filter section.

Abstract: A method is provided of slewing a bandwidth characteristic of a digital filter within a range between a first bandwidth characteristic and a second bandwidth characteristic. The digital filter includes a plurality of cascaded filter sections, each filter section being comprised of a second order filter having coefficients a1, a2, b0, b1, and b2. An index value is determined for identifying a desired bandwidth characteristic within the range. Values are interpolated for the coefficient values for the a1 and a2 coefficients of a respective filter section in response to the index value. Coefficient values are derived for the b0, b1, and b2 coefficients in response to the coefficient values for the a1 and a2 coefficients such that the b0, b1, and b2 coefficient values provide a matched gain for the respective filter section. The coefficient values are loaded into the respective filter section.