The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 2009
Filed:
Dec. 17, 2004
Robert E. Morley, Jr., St. Louis, MO (US);
Robert S. Deland, Jr., Torrance, CA (US);
Emmanuel C. Limtao, Bellflower, CA (US);
Edward J. Richter, Richmond Heights, MO (US);
Stephen R. Wood, San Pedro, CA (US);
Robert E. Morley, Jr., St. Louis, MO (US);
Robert S. Deland, Jr., Torrance, CA (US);
Emmanuel C. Limtao, Bellflower, CA (US);
Edward J. Richter, Richmond Heights, MO (US);
Stephen R. Wood, San Pedro, CA (US);
Magtek, Inc., Carson, CA (US);
Washington Univ., St. Louis, MO (US);
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 magnetic field of the magnetic medium, an analog-to-digital converter (ADC) in communication with the sensing unit and configured to digitize the analog signal, a filter in communication with the ADC configured to enhance the component of the signal associated with the remanent noise characteristic, a data extraction unit, in communication with the ADC and the filter configured to measure at least bit duration and peak location and an authentication extraction unit, in communication with the filter and the data extraction unit configured to extract a set of scaled samples from the output of the filter representative of the remanent noise characteristic.