Apparatus and method for embedding and extracting information in analog signals using replica modulation
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United States of America Patent
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Jul 30, 2002
Grant Date -
Jul 25, 2002
app pub date -
Jun 29, 1998
filing date -
May 19, 1997
priority date (Note) -
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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.
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