Methods, apparatus and articles of manufacture to perform audio watermark decoding
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United States of America Patent
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Mar 18, 2014
Grant Date -
Oct 27, 2011
app pub date -
Apr 26, 2010
filing date -
Apr 26, 2010
priority date (Note) -
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Abstract
Example methods, apparatus and articles of manufacture to perform audio watermark decoding are disclosed. A disclosed example method includes receiving an audio signal including an audience measurement code embedded therein using a first plurality of frequency components, sampling the audio signal, transforming the sampled audio signal into a first frequency domain representation, determining whether the code is detectable in the first plurality of frequency components of the first frequency domain representation, and when the code is not detected in the first plurality of frequency components, examining a second plurality of frequency components of a second frequency domain representation to determine whether the code is detected, the second plurality of frequency components being offset from the first plurality of frequency components by a first offset, the first offset corresponding to a sampling frequency mismatch.
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