Patent ID: 6713689
Filing Date: 2004-03-30
Classification: G01G

Abstract:
A system for determining a weight for an item, comprising:a) a scale system for generating a digital output signal, said scale system comprising: a1) a support for supporting said item; and a2) a transducer for generating said digital output signal, said signal being representative of an instantaneous response of said support; and b) a data processing system for, in response to said digital output signal: b1) detecting presence of said item on said support; b2) storing a sequence of values of said digital output signal, said sequence initially consisting of a first predetermined number of initial values of said digital output signal; b3) determining a difference, D, between a maximum value in said sequence and a minimum value in said sequence; b4) determining an average, A, of a second predetermined number of latest values in said sequence; b5) determining if an absolute value of (Bâˆ’A) is less than D, where B is a weight break between weight ranges; b6) if the absolute value of (Bâˆ’A) is less than D, updating said sequence by replacing a third predetermined number of earliest values in said sequence with said third predetermined number of new latest values of said digital output signal; and returning to step b3; and b7) if the absolute value of (Bâˆ’A) is not less than D, calling said weight as said average A.