Patent ID: 6643323
Filing Date: 2003-11-04
Classification: H03H

Abstract:
A method of implementing a digital filter comprising the steps of:(a) providing a first digital filter characteristic having a value x that comprises a denominator portion for a filter function having a numerator portion and a denominator portion, wherein the filter function is associated with a digital filter element parameter; (b) providing a predetermined constant s having a numerical value between about 0.5 and about 0.6; (c) generating a constant n having a value determined by the position of the most significant bit of a binary number representation of the value of x; (d) generating a reciprocal estimate for x using the functional relationship represented by: 1/x=(1/s)*2âˆ’nâˆ’2âˆ’(xâˆ’2n)*2âˆ’2nâˆ’1+2âˆ’nâˆ’1; (e) generating a digital filter element parameter via multiplying the reciprocal estimate for x by a numerical value of the numerator portion of the filter function; and (f) characterizing a digital filter element via the generated element parameter to implement the digital filter.