Apparatus and method for embedding and extracting information in analog signals using distributed signal features and replica modulation
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United States of America Patent
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Jun 25, 2013
Grant Date -
Apr 5, 2012
app pub date -
Dec 9, 2011
filing date -
May 19, 1997
priority date (Note) -
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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. In one embodiment, the predefined value is a short term auto correlation value of the cover signal.
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