Integrating digital data with perceptible signals
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United States of America Patent
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May 14, 2002
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N/A
app pub date -
Mar 30, 1998
filing date -
Mar 30, 1998
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Abstract
A method for combining digital data with a perceptible program signal. The data stream is modulated onto an electromagnetic signal encoding the perceptible signal; the modulating employs a spread spectrum encoding of the data stream. The modulated program signal is transduced into perceptible form. A capture device receives the perceptible signal, and a decoder extracts the spread spectrum encoded data from the received signal. The method is particularly useful in encoding purchase information or watermarking information into the signal.
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