Error detection and correction apparatus for character readers

• US 3,303,463 A
• Filed: 03/04/1963
• Issued: 02/07/1967
• Est. Priority Date: 03/04/1963
• Status: Expired due to Term

• Current Assignee: Arthur Hamburgen
• Original Assignee: Arthur Hamburgen
• Inventors: ARTHUR HAMBURGEN
• Application Number:
  US04/262,417
• Time in Patent Office: 1,436 Days
• US Class Current: 714/807
• CPC Class Codes: G06F 11/104 using arithmetic codes, i.e. codes which are preserved during operation, e.g. modulo 9 or 11 check

Claims

1. APPARATUS FOR:

(A) CHECKING THE ACCURACY OF READINGS BY CHARACTER READING APPARATUS OR THE LIKE OF CHARACTER GROUPS EACH COMPRISING A NUMBER OF CHARACTERS HAVING ASSIGNED VALUES AND A SINGLE REDUNDANT CHECK CHARACTER WHOSE ASSIGNED VALUE CAUSES A CHARACTER GROUP TO SATISFY AN ARITHMETICAL CHECKING FORMULA;

AND (B) SELECTIVELY COMPLETING INCOMPLETELY READ CHARACTER GROUPS WHEREIN EACH OF SAID INCOMPLETELY READ CHARACTER GROUPS HAS MORE THAN ONE UNCERTAINTY CHARACTER POSITION AND THE CHARACTER READING APPARATUS PROVIDES AT LEAST TWO UNCERTAINTY CHARACTERS FOR EACH UNCERTAINTY CHARACTER POSITION, COMPRISING;

STORAGE MEANS FOR RECEIVING AND STORING THE SIGNALS REPRESENTING THE ASSIGNED VALUES OF THE RECOGNIZED CHARACTERS OF A CHARACTER GROUP AND THE SIGNALS REPRESENTING THE ASSIGNED VALUES OF AT LEAST TWO UNCERTAINTY CHARACTERS FOR EACH UNCERTAINTY CHARACTER POSITION OF SAID CHARACTER GROUP;

MEANS FOR DETERMINING WHETHER THE ASSIGNED VALUES OF A GROUP OF CHARACTERS SUPPLIED THERETO SATISFY SAID ARITHMETICAL CHECKING FORMULA;

AND MEANS TO SUPPLY REPRESENTATIONS OF POSSIBLE COMBINATIONS OF SAID ASSIGNED VALUES OF SAID RECOGNIZED CHARACTERS AND SAID UNCERTAINTY CHARACTERS FROM SAID STORAGE MEANS TO SAID MEANS FOR DETERMINING TO DETERMINE WHICH, IF ANY, OF SAID POSSIBLE COMBINATIONS SATISFY SAID ARITHMETICAL CHECKING FORMULA.