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:
Aug. 02, 2011
Filed:
Feb. 04, 2009
Yannick Le Devehat, Quebec, CA;
David Perron, Quebec, CA;
Olivier Fraysse, Quebec, CA;
Pierre Dumouchel, Ile des Soeurs, CA;
Rene Landry, Jr., Longueuil, CA;
Francois Rivest, Ville de Deux Montagnes, CA;
Yannick Le Devehat, Quebec, CA;
David Perron, Quebec, CA;
Olivier Fraysse, Quebec, CA;
Pierre Dumouchel, Ile des Soeurs, CA;
Rene Landry, Jr., Longueuil, CA;
Francois Rivest, Ville de Deux Montagnes, CA;
Identita Technologies International SRL, Christ Church, BB;
Abstract
Methods and apparatus for coding a digital data string to represent a sequence of acoustic frequencies to be transmitted as an acoustic signal by a genuine acoustic authentication device; related to providing for improving the rate of successfully detecting a valid data string contained in the acoustic signal transmitted by the device. Each of a plurality of groups of bits of the data string are coded to represent a respective frequency value set of one or more acoustic frequencies to be transmitted acoustically to represent the respective group of bits. The number of acoustic frequencies in a frequency value set is less than the number of bits in the respective group of bits that the frequency value set represents. For each of the plurality of groups of bits of the data string, the respective frequency value set is selected according to a predetermined frequency assignation pattern that provides for probabilistic transition coding used for error correction of the acoustic signal.