Processing of magnetically recorded data to detect fraud
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United States of America Patent
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Mar 18, 1997
Grant Date -
N/A
app pub date -
Mar 1, 1995
filing date -
Jul 27, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A coil (6) forming part of a tuned circuit (8) is wound around a gapped magnetic core (2). As a magnetic stripe (14) is passed under core (2), variations to the amplitude and frequency of the circuit (8) occur dependent upon the magnetic data on the strip (14). Selected data are manipulated to derive several values (32, 36, 38, and 40) for combination via AND-gate (47). Only if the combination value is above a threshold value is an indication given that the stripe (14) is genuine and not an attempted copy.
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