Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Preparation and Recovery of Hand Scan Code

IP.com Disclosure Number: IPCOM000074346D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Payst, MW: AUTHOR [+2]

Abstract

This is a technique of encoding data on a media such as a credit card. The encoding technique is relatively insensitive to velocity variations of a code scanner and may, therefore, be read by a hand propelled scanner. The encoding is illustrated for a typical bit pair. The areas labeled X are of uniform width and the areas B and C have widths selected to encode all possible combinations (00, 01, 10 and 11) of the bit pair. It can be assumed that the velocity of the scan in the area B will approximate the average of the velocities in the X areas bracketing the B area thus, (Image Omitted) Circuits for determining the value of B consist of means for determining the ratios T2/T1 and T2/T3 and adding the quantities thus derived. Since the factor K is constant, it may be ignored or wired in.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Preparation and Recovery of Hand Scan Code

This is a technique of encoding data on a media such as a credit card. The encoding technique is relatively insensitive to velocity variations of a code scanner and may, therefore, be read by a hand propelled scanner. The encoding is illustrated for a typical bit pair. The areas labeled X are of uniform width and the areas B and C have widths selected to encode all possible combinations (00, 01, 10 and 11) of the bit pair. It can be assumed that the velocity of the scan in the area B will approximate the average of the velocities in the X areas bracketing the B area thus,

(Image Omitted)

Circuits for determining the value of B consist of means for determining the ratios T2/T1 and T2/T3 and adding the quantities thus derived. Since the factor K is constant, it may be ignored or wired in. The value for C is determined in the same way. A less exact data recovery scheme can be implemented in accordance with the two following expressions for B and C: B = K ( T2 over T1 + T3) and C = K (T4 over T3 + T5).

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]