DATA EMBEDDING SYSTEM
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United States of America Patent
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Issued Date -
May 26, 2011
app pub date -
May 29, 2009
filing date -
May 29, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A data hiding system is described for hiding data within an audio signal. The system can be used for watermarking, data communications, audience surveying etc. The system hides data in an audio signal by adding artificial echoes whose polarity varies with the data to be hidden. In one embodiment, each data value is represented by a positive and a negative echo having different delays. A receiver can then remove the effects of natural echoes and/or periodicities in the audio signal by differencing measurements obtained at the different delays.
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