Apparatus and method for embedding and extracting information in analog signals using distributed signal features
US6175627A · kind A · utility
191Cited by
21References
23Claims
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Key dates
| Filing date | Nov 20, 1997 |
| Grant date | Jan 16, 2001 |
| Priority date | — |
| Expiry date | Nov 20, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T1/0028
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Apparatus and methods are provided for embedding or embedding digital data into an analog host or cover signal. A distributed signal feature of the cover signal in a particular domain (time, frequency or space) is calculated and compared with a set of predefined quantization values corresponding to an information symbol to be encoded. The amount of change required to modify the signal feature to the determined target quantization value is calculated and the cover signal is modified accordingly to so change the feature value over a predefined interval. Information symbols are extracted by the opposite process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.