Patent ID: 7529941
Filing Date: 2009-05-05
Classification: G10L

Abstract:
1. A computing device for retrieving a watermark in a watermarked signal, the watermarked signal comprising odd and even overlapped blocks where the watermark is contained in even blocks, the computing device comprising: a processor; a module configured to control the processor to subtract odd blocks from a k-th block of the watermarked signal to generate a first signal; a module configured to control the processor to apply a Fast Fourier Transform (FFT) to the first signal to generate a phase a module configured to control the processor to calculate a phase of a module configured to control the processor to calculate the difference Ψ( a module configured to control the processor to use a Viterbi search to retrieve the watermark embedded in Ψ( unwraps Ψ( uses the Viterbi search to retrieve the watermark embedded in {tilde over (Φ)}