Data watermarks created by using an uneven sampling period

Details Data watermarks created by using an uneven sampling period Data watermarks created by using an uneven sampling period

2006-05-23

2006-05-23

Sheikh, Ayaz (Department: 2131)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S168000, C713S176000, C380S028000, C380S036000, C380S038000, C380S039000, C380S046000, C380S054000, C380S261000, C375S276000, C375S354000, C382S251000, C704S205000, C704S500000, C704S503000, C341S051000, C341S063000

Reexamination Certificate

active

07051203

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.

REFERENCES:
patent: 4773092 (1988-09-01), Huang
patent: 5245661 (1993-09-01), Lee et al.
patent: 5687236 (1997-11-01), Moskowitz et al.
patent: 5822432 (1998-10-01), Moskowitz et al.
patent: 5889868 (1999-03-01), Moskowitz et al.
Jerri, Adul J.; Proc. of the IEEE, vol. 65, No. 11, Nov. 1977; “The Shannon Sampling Theorem—Its Various Extensions and Applications: A Tutorial Review”; pp. 1565-1598.

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