Browse Prior Art Database

Self Check Scheme

IP.com Disclosure Number: IPCOM000077343D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Gates, GA: AUTHOR

Abstract

This scheme permits the detection of single-keying errors, single transpositions and double transpositions in key entry devices.

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This is the abbreviated version, containing approximately 100% of the total text.

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Self Check Scheme

This scheme permits the detection of single-keying errors, single transpositions and double transpositions in key entry devices.

In the scheme each digit of a number is assigned a weighting factor which it is multiplied by. The weighting factors are 2, 3, 4, 5, 6, 7, 2, 3, 4, etc., starting with the units position of the number and progressing towards the higher order Position. The sum of all these numbers is then added up and the total divided by
11. The sum is then subtracted from 11 to give the self-check digit. The digit is put into the units position of the self-check number, while the basic number occupies the 10's position upward. From the above example, it can be seen how the described manipulation is performed for a specific number. A check digit of 10 cannot be used and the accounting system must be adjusted to eliminate it from the self-check number. When the calculations on the basic number result in a check digit of 11, the digit 0 can be substituted to make a valid self-checking number.

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