Watermark generator, watermark decoder, method for providing a watermark signal in dependence on binary message data, method for providing binary message data in dependence on a watermarked signal and computer program using a differential encoding

US9350700B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Stefan Wabnik · Ilmenau, DE
• Joerg Pickel · Happurg, DE
• Bert Greevenbosch · Rotterdam, NL
• Bernhard Grill · Lautenbächle, DE
• Ernst Eberlein · Erlangen, DE
• Giovanni Del Galdo · Martinroda, DE
• Stefan Kraegeloh · Erlangen, DE
• Reinhard Zitzmann · Effeltrich, DE
• Tobias Bliem · Erlangen, DE
• Marco Breiling · Berlin, DE
• Juliane Borsum · Erlangen, DE

Key dates

• Filing date: Aug 17, 2012
• Grant date: May 24, 2016
• Expiry date: Sep 27, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/018
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

A watermark generator for providing a watermark signal in dependence on binary message data includes an information processor configured to provide, in dependence on information units of the binary message data, a first time-frequency domain representation, values of which represent the binary message data. The watermark generator also includes a differential encoder configured to derive a second time-frequency domain representation from the first time-frequency-domain representation, such that the second time-frequency-domain representation includes a plurality of values, wherein a difference between two values of the second time-frequency-domain representation represents a corresponding value of the first time-frequency-domain representation, in order to obtain a differential encoding of the values of the first time-frequency-domain representation. The watermark generator also includes a watermark signal provider configured to provide the watermark signal on the basis of the second time-frequency-domain representation.