Patent ID: 7027502

Claim:
A method of slewing a bandwidth characteristic of a digital filter within a range between a first bandwidth characteristic and a second bandwidth characteristic, said digital filter including a plurality of cascaded filter sections, each of said plurality of cascaded filter sections having respective coefficients, said method comprising the steps of: establishing a polynomial having an order greater than or equal to two for modeling a changing value of one of said coefficients at said first and second bandwidth characteristics within said range; determining an index value for identifying a desired bandwidth characteristic within said range; inputting said index value into said polynomial to obtain a corresponding coefficient value for said one of said coefficients; and loading said corresponding coefficient value into a respective filter section; wherein each of said plurality of cascaded filter sections is comprised of a second order filter having coefficients a 1 , a 2 , b 0 , b 1 , and b 2 , and wherein coefficient values for said a 1 and a 2 coefficients are modeled by said polynomial a 1 =p 0,1 +( p 1,1 ●i )+( p 2,1 ●i 2 ), and a 2 =p 0,2 +( p 1,2 ●i )+( p 2,2 ●i 2 ), where i is said index value and p terms are predetermined constants.