公开(公告)号：US3913067A

公开(公告)日：1975-10-14

申请号：US37014373

申请日：1973-06-14

Applicant: GOLDBERG LESLIE LOUIS

Inventor： GOLDBERG LESLIE LOUIS

IPC: G06K5/00 ,  G07F7/12 ,  G09C1/10 ,  H03K13/34 ,  G06F11/10 ,  G06K5/02 ,  H04L1/10

CPC classification number: G06K5/00 ,  G06Q20/04

Abstract: The specification discloses a check digit verification apparatus having the following novel concepts 1. THE USE OF A READ-ONLY STORE (16) TO HOLD TABLES OF REMAINDER VALUES WHEREBY TO OBVIATE THE NEED FOR MULTIPLICATION COMPUTING ABILITY; 2. THE USE OF REMAINDER VALUES APPROPRIATE TO THE RESPECTIVE DIGITS OF AN IDENTITY NUMBER TO BE VERIFIED, AND SUMMATION OF THOSE REMAINDER VALUES TO PROVIDE AN OVERALL REMAINDER VALUE FOR THE IDENTITY NUMBER; 3. THE USE OF A REMAINDER VALUE ACCUMULATING STORE (23) HAVING A NUMBER OF STAGES EQUAL TO THE MODULUS OF THE SYSTEM, SO THAT THE CONTENTS OF THE STORE IS AN ACCUMULATED REMAINDER VALUE, THUS OBVIATING THE NEED FOR A ''DIVISION'' COMPUTING ABILITY; AND 4. THE USE OF A REGISTER (55) FOR TEMPORARILY STORING THE DIGITS OF AN IDENTITY NUMBER WHICH IS TO BE VERIFIED, AND FOR RETAINING A PREDETERMINED INITIAL GROUP OF DIGITS AFTER ALL THE DIGITS OF THE IDENTITY NUMBER HAVE BEEN TRANSFERRED INTO THE VERIFICATION MEANS, WHEREBY TO REDUCE THE NUMBER OF DIGITS THAT HAVE TO BE KEYED-IN WHEN THE NEXT IDENTITY NUMBER FOR VERIFICATION INCLUDES THE RETAINED INITIAL GROUP OF DIGITS.