Apparatus and method for encoding and decoding information in analog signals
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United States of America Patent
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Aug 17, 1999
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N/A
app pub date -
May 19, 1997
filing date -
May 19, 1997
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Abstract
Apparatus and methods are provided for encoding, storing and decoding auxiliary information on an analog source signal in a way which has minimal impact on the human perception of the source information when the source signal is applied to an appropriate output device, such as a speaker or a display monitor. The autocorrelation function of a host signal is modulated according to the value of an auxiliary information signal by adding a host modifying signal to the host signal. The auxiliary signal is decoded by generating the autocorrelation function of the encoded signal and extracting the auxiliary signal according to well-known signal extraction techniques.
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