Registers – Coded record sensors – Particular sensor structure
Patent
1991-02-14
1993-08-10
Pitts, Harold
Registers
Coded record sensors
Particular sensor structure
235380, 235493, G06K 708
Patent
active
052351661
ABSTRACT:
Magnetic media containing data and method for data verification are disclosed. The data verification method utilizes the relative position of specific features of magnetic media signals, such as, peak zero crossings, the ratio of preselected amplitudes, the locii of preselected points along the signal, the RMS value of the waveform and the like. In the preferred embodiment, the ratio of the separation of adjacent pulses in the signal is employed. The deviation of the precise location of the placement of the peak points in the signal waveform is referred to as "jitter". This "jitter" is enhanced to provide a pattern of "jitter" or a magnetic "signature" that is random, non-reproducible and that can be used to positively identify a particular specimen of magnetic media and the associated data. The magnetic jitter pattern or security signature can be separate from or an integral part of the data recorded on the magnetic media. The data verification method and magnetic media have particular application in the field of credit cards.
REFERENCES:
patent: 4650978 (1987-03-01), Hudson et al.
patent: 4837426 (1989-06-01), Pease et al.
"The Complete Handbook of Magnetic Recording," Jorgensen, 1980, p. 65.
Pitts Harold
XTec Incorporated
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