Method of improving successful recognition of genuine acoustic authentication devices
US7992067B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2009 |
| Grant date | Aug 2, 2011 |
| Priority date | — |
| Expiry date | Jun 15, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/56
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.