Data watermarks created by using an uneven sampling period
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United States of America Patent
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Feb 23, 2010
Grant Date -
Sep 8, 2005
app pub date -
May 5, 2005
filing date -
Nov 8, 1999
priority date (Note) -
Expired
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Abstract
Input signals are electronically watermarked using an uneven or non-uniform sampling rate. The uneven or non-uniform sampling may be pseudo-random. The uneven or non-uniform sampling meets the Nyquist criterion so that aliasing and loss of content are avoided. The resulting sampling pattern in the sampled data is detectable by a comparison with the original source data.
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