Patent ID: 8726031
Filing Date: 2014-05-13
Classification: G06F,G10L

Abstract:
1. A watermark generator for providing a watermark signal in dependence on binary message data, the watermark generator comprising: an information spreader configured to spread an information unit of the binary message data to a plurality of time-frequency-domain values, to acquire a spread information representation; a synchronization inserter configured to multiplicatively combine the spread information representation with a synchronization spread sequence to acquire a combined information-synchronization representation; and a watermark signal provider configured to provide the watermark signal on the basis of the combined information-synchronization representation; wherein the information spreader is configured to selectively spread a given bit onto a first bit representation, which is a positive multiple of a bit spread sequence, or onto a second bit representation, which is a negative multiple of the bit spread sequence, in dependence on the value of the given bit; wherein the information spreader is configured to acquire the spread information representation R according to wherein c wherein m is a vector of size 1×N wherein the synchronization inserter is configured to combine the spread information with a synchronization sequence S according to to acquire the combined information-synchronization representation C, wherein S designates a matrix of size N wherein ∘ designates a Schur element-wise product; and wherein the watermark generator comprises a hardware apparatus, a computer, or a combination of a hardware apparatus and a computer.