System and method of watermarking a signal
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United States of America Patent
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Nov 11, 2008
Grant Date -
N/A
app pub date -
Apr 4, 2006
filing date -
Jun 4, 2001
priority date (Note) -
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Abstract
A method of retrieving a watermark in a watermarked signal involves processing a signal having odd- and even-overlapped blocks and where the watermark is contained in the even blocks. For each k-th block, the method comprises subtracting the odd-numbered blocks from the k-th block of the watermarked signal to generate s*.sub.k(n), applying an FFT to s*.sub.k(n) to generate a phase S.sub.k(f), calculating a phase of S.sub.k(f) as .phi.(f) and a phase of an original signal S.sub.k(f) as .phi.(f), calculating the difference .PSI.(f) between .phi.(f) and .phi.(f); and retrieving the watermark embedded in .PSI.(f). A Viterbi search may be the algorithm used to retrieve the watermark.
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