Methods and apparatus to extract data encoded in media content
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United States of America Patent
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Feb 21, 2012
Grant Date -
Apr 29, 2010
app pub date -
Oct 22, 2009
filing date -
Oct 24, 2008
priority date (Note) -
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Abstract
Methods and apparatus to extract data encoded in media content are disclosed. An example method includes receiving a media content signal, sampling the media content signal to generate digital samples, determining a frequency domain representation of the digital samples, determining a first rank of a first frequency in the frequency domain representation, determining a second rank of a second frequency in the frequency domain representation, combining the first rank and the second rank with a set of ranks to create a combined set of ranks, comparing the combined set of ranks to a set of reference sequences, determining a data represented by the combined set of ranks based on the comparison, and storing the data in a tangible memory.
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