Registers – Coded record sensors – Particular sensor structure
Reexamination Certificate
2008-05-27
2008-05-27
Paik, Steven S. (Department: 2887)
Registers
Coded record sensors
Particular sensor structure
C235S493000
Reexamination Certificate
active
07377433
ABSTRACT:
A system for verifying the authenticity of data contained in a magnetic medium using the remanent noise characteristics of the magnetic medium. In one embodiment, the invention includes a sensing unit configured to generate a signal indicative of the sensed magnetic field and an amplifier. The amplifier is in communication with the sensing unit, is configured to amplify signals having amplitudes less than a threshold by at least a first factor and configured to amplify signals having amplitudes greater than the threshold by at most a second factor. The first factor is greater than the second factor. The invention also includes an analog-to-digital converter (ADC) in communication with the amplifier and configured to digitize the analog signal, a filter in communication with the ADC configured to attenuate the portion of the digitized signal indicative of the stored data, a data extraction unit in communication with the ADC and the filter, which is configured to measure bit duration and peak location and an authentication extraction unit in communication with the filter and the data extraction unit, which is configured to extract a set of scaled samples representative of the remanent noise characteristic.
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Engel George L.
Morley, Jr. Robert E.
Richter Edward J.
Christie Parker & Hale, LLP.
Koyama Kumiko C.
Paik Steven S.
Washington University in St. Louis
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