Verance Corporation

Edward Atrero

Chong U Lee

Julien Nicolas

Katherine S Lam

A system for embedding auxiliary digital information into a primary digital signal to form a composite digital signal. Auxiliary data bits modulate a pseudo-random (e.g., PN) sequence to provide an auxiliary data sequence used to modify the Least Perceptually Significant Bits (LPSBs) of successive multi-bit samples of the primary signal. In a cross-term compensation embodiment, a correlation between the PN sequence and the sample bits is determined, and compared to the auxiliary data bits to determine whether there is a desired correspondence. The LPSBs in the samples are toggled, if necessary, to provide the desired correspondence. The selection of LPSBs to modify accounts for a desired noise level of the auxiliary data in the primary signal. LPSBs may be modified based on a sparse PN sequence to achieve the desired noise level and conceal the presence of the auxiliary data.

Digital hidden data transport (DHDT)

A system for embedding auxiliary digital information (D ) into an existing primary digitally encoded signal (X ) to form an unobjectionable composite digital signal (C ). Auxiliary data bits (D ) modulate a pseudo-random (e.g., PN) sequence ( ) to provide an auxiliary data sequence ( ) that is used to modify the Least Perceptually Significant Bits (LPSBs) ( ) of successive multi-bit samples ( ) of the primary signal. In a cross-term compensation embodiment ( ), a correlation (V) between the PN sequence and the sample bits is determined, and compared to the auxiliary data bits (D ) to determine whether there is a desired correspondence. The LPSBs in the samples are toggled ( ), if necessary, to provide the desired correspondence. The selection of LPSBs to modify accounts for a desired noise level of the auxiliary data (D ) in the primary signal (X ). LPSBs may be selected to be modified based on a sparse PN sequence ( ) to achieve the desired noise level and to conceal the presence of the auxiliary data (D ). The data to be hidden can be any digital data, while the primary signal is any uncompressed or compressed digitally sampled process, including, for example, audio or video data.

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San Diego, CA, United States of America

Edward Atrero