Watermark decoder and method for providing binary message data

US9299356B2 · 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 20, 2012
• Grant date: Mar 29, 2016
• Expiry date: May 31, 2034

Classification

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

Abstract

A watermark decoder includes a time-frequency-domain representation provider, a memory unit, a synchronization determiner and a watermark extractor. The time-frequency-domain representation provider provides a frequency-domain representation of the watermarked signal for a plurality of time blocks. The memory unit stores the frequency-domain representation of the watermarked signal for a plurality of time blocks. Further, the synchronization determiner identifies an alignment time block based on the frequency-domain representation of the watermarked signal of a plurality of time blocks. The watermark extractor provides binary message data based on stored frequency-domain representations of the watermarked signal of time blocks temporally preceding the identified alignment time block considering a distance to the identified alignment time block.