Apparatus and method for embedding and extracting information in analog signals using replica modulation
US6427012B1 · kind B1 · utility
129Cited by
9References
27Claims
0Family size
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Key dates
| Filing date | Jun 29, 1998 |
| Grant date | Jul 30, 2002 |
| Priority date | — |
| Expiry date | Jun 29, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0052
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Apparatus and methods are provided for embedding or encoding auxiliary signals into an analog host or cover signal. A replica of the cover signal or a portion of the cover signal in a particular domain (time, frequency or space) is generated according to a stego key specifying modification values to specified parameters of the cover signal. The replica signal is then modified by an auxiliary signal corresponding to the information to be embedded, and inserted back into the cover signal. Embedded auxiliary signals are extracted by generating replicas of received signals and correlating the replicas with the received signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.