Patent ID: 6173301
Filing Date: 2001-01-09
Classification: G06F

Abstract:
A method for generating a signal amplitude behaving according to a desired function; in said method amplitude is generated digitally and variable data (213) of the function is used as address data, comprising:representing a desired amplitude behaviour in an approximative manner by means of a predetermined number N of piecewise straight lines each of which has a slope (210) and a constant term (209) that are stored, and said straight lines being generated using a linear regression and comprising a predetermined number M of variable values;dividing address data (213) in two parts, a first part (207) functioning as an address for the slope and the constant term of each straight line and a second part (208) corresponding to a variable value on each piecewise straight line;converting addresses of the second part (208) of the address data to negative and positive variable values of the straight lines so that an address substantially in the middle of the second part (208) of the address data becomes a variable value, which is preferably zero;selecting, by means of the first part (207) of the address data, the slope (210) and the constant term (209) of each generated approximative straight line and selecting, by means of the second part (208), a variable value on a piecewise straight line;generating, by means of the variable value and the slope, a coefficient term (211) of the piecewise straight line;generating a desired amplitude value (212) by summing the coefficient term (211) and the constant term (209) of the piecewise straight line.