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Synthesized MICR Symbol Signals

IP.com Disclosure Number: IPCOM000036209D
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 3 page(s) / 56K

Publishing Venue

IBM

Related People

Rohrer, GD: AUTHOR [+2]

Abstract

Disclosed is a means for synthesizing MICR symbol signals which are substituted for the output from Standard Signal Reference Documents usually used in calibrating MICR print quality. This is accomplished by microprocessor control of an electrical current in a conductor, in front of an MICR read head gap, thus generating a time variant magnetic field which simulates the process of scanning printed MICR symbols.

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Synthesized MICR Symbol Signals

Disclosed is a means for synthesizing MICR symbol signals which are substituted for the output from Standard Signal Reference Documents usually used in calibrating MICR print quality. This is accomplished by microprocessor control of an electrical current in a conductor, in front of an MICR read head gap, thus generating a time variant magnetic field which simulates the process of scanning printed MICR symbols.

Referring to Fig. 1, it is seen that a Current Generator, consisting of a group of parallel resistors, 1, 2, 3, 4, and 5 together with voltage divider resistors 6 and 7 and transistor 8, receives input from microprocessor 9 and outputs to MICR Tester 10, in which Current Conductor 11 is located in front of the gap of Read Head 12.

The microprocessor 9 is programmed to input Voltage E successively to selected terminals 0-4, individually or in groups, for specific intervals, thus varying Current I in Conductor 11 and presenting a time variant magnetic field to the gap of Read Head 12. (The same waveforms may alternatively be coupled directly to the Read Head pre-amplifier input through known circuitry.)

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It is apparent that Current I = E/RP (1 + RF/RS) where RP is the net parallel resistance of selected Resistors 1-5. RS is adjusted to produce normal operating voltage levels at the output of Read Head 12. (Note that the values of Resistors 2-5 are all fractions of Resistor 1.) An example of time variant current...