Browse Prior Art Database

Error Correction System

IP.com Disclosure Number: IPCOM000094714D
Original Publication Date: 1965-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Daino, PW: AUTHOR [+4]

Abstract

This arrangement corrects errors in a character recognition system. This is effected by rescanning the character information at a different clipping level from that used in a first scan. Such occurs in the event that the recognition system fails to recognize a character on the first scan of the character. The rescanned information is compared with the original scan information.

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Error Correction System

This arrangement corrects errors in a character recognition system. This is effected by rescanning the character information at a different clipping level from that used in a first scan. Such occurs in the event that the recognition system fails to recognize a character on the first scan of the character. The rescanned information is compared with the original scan information.

The original scan information is stored on magnetic drum 3 under the control of recognition logic 5 and failure detection circuit 7. Circuit 7 also governs scan control 9 to cause a second scan to occur at a different clipping level from the first. When recognition failure occurs, this fact is determined by circuit 7 and causes the drum 3 control to leave the storage position on drum 3 assigned to the unrecognized character in a blank condition.

Characters which are recognized go to compare circuit 11 where they are compared with their corresponding positions on drum 3. If no character is on drum 3, as in the case of failure to be recognized, the recognized character is written on drum 3 and, if the character is in a self-checking field, is supplied to field check circuits 13. With a character sensing failure occurring on the first scan, copy circuits 14 cause a copy operation to be performed. This is effected by copying the information from one-half of drum 3 to another half in one drum revolution, reducing the access time to within the character scanning rate.

On...