MAXIMUM MARK LENGTH DETECTOR AND DETECTION METHOD

摘要

PROBLEM TO BE SOLVED: To obtain an exact frequency by saving a measured mark length, measuring the mark continuous with this mark, determining the sum of the saved mark length and the freshly measured mark length and detecting the sum of he lengths of the longest mark and the mark continuous with this mark as the max. mark length. ;SOLUTION: The total value of the mark lengths is saved from the point of the time the max. value of the sum of the lengths of the continuous marks is measured by a total register 12 for which an arbitrary memory element capable of reading-out and writing is used. A measured value register 14 is capable of using the arbitrary memory element capable of saving at least the previously measured mark lengths and reading out and writing these mark lengths. An arithmetic and logic unit 22 determines the sum of the previously measured mark length and the mark length measured this time, adds the measured value of this time to the tote value and subtracts the max. value from the total value, for which an arbitrary arithmetic circuit capable of making at least addition, subtraction and division is used.;COPYRIGHT: (C)2000,JPO