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Logic Circuit Employed in Character Recognition System

IP.com Disclosure Number: IPCOM000093687D
Original Publication Date: 1966-Jan-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Chow, CK: AUTHOR [+2]

Abstract

This circuit is employed in character recognition systems in which the unknown character is sampled and converted into a train of binary digits X. Each digit X is compared with two binary reference digits R1 and R2. The results of these comparisons cause binary counter 5 to be advanced in accordance with the partial truth table. The other five possible combinations of the three binary digits X, R1 and R2 result in no advance of counter 5.

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Logic Circuit Employed in Character Recognition System

This circuit is employed in character recognition systems in which the unknown character is sampled and converted into a train of binary digits X. Each digit X is compared with two binary reference digits R1 and R2. The results of these comparisons cause binary counter 5 to be advanced in accordance with the partial truth table. The other five possible combinations of the three binary digits X, R1 and R2 result in no advance of counter 5.

A group of triggers TX, TR1 and TR2 is set into the 1 or 0 state in accordance with the digits X, R1 and R2 respectively. Exclusive-Or 7 and And 9 combine selected outputs from the triggers TX...TR2 and provide an input to the first stage 20 of counter 5. Each time a signal is provided by And 9, counter 5 advances one position. A pair of And's 11 and 13 is connected to selected outputs from triggers TX...TR2 and provide a signal to the third stage 22 of counter 5. Each time And 13 provides an output, counter 5 is advanced four positions.

The setting of counter 5 indicates the amount of difference, or dissimilarity, between the unknown character digits X and the reference digits R1 and R2. By giving added weight, i.e., four times as much, to the condition when R1 and R2 are both 0, the ability of the character recognition system to distinguish between characters is increased.

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