Pulse or digital communications – Spread spectrum
Reexamination Certificate
2005-02-08
2005-02-08
Patel, Jayanti (Department: 2637)
Pulse or digital communications
Spread spectrum
C382S100000, C713S176000
Reexamination Certificate
active
06853676
ABSTRACT:
A method for inserting and detecting a watermark based on a stochastic model is disclosed. The apparatus for inserting a watermark based on a stochastic model, includes: a generator for generating a spread spectrum signal by using a user key from outside; an estimator for estimating an autocorrelation matrix of an original signal from outside as an object for inserting a watermark; an eigenvalue decomposer for decomposing the autocorrelation matrix to an eigenvector matrix and an eigenvalue matrix; a watermark shaper for shaping a watermark from the spread spectrum signal in reference to both the eigenvector matrix and the eigenvalue matrix; and an adder for adding the watermark to the original signal.
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Goshtasbi-G. Jamshid
Korea & Telecom
Patel Jayanti
Staas & Halsey , LLP
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