Servizio Comunitario di Informazione in materia di Ricerca e Sviluppo - CORDIS

Real-time microphone-based audio watermarking

An audio watermarking system to add digital information to audio tracks was developed, implemented and tested.

The system can embed in real time up to 60 bits per second into audio material, which cannot be perceived by listeners.

The embedded information can be extracted in real time by a notebook-based analyser, which is coupled by microphone to the sound track.

Applications are:
- Copy protection of media by adding customers identity or transaction information to the sound track.

- Media control applications for broadcasting.

- Additional (lecret) low capacity data channels in existing audio channels.

The system was tested by EBU in July 2003 and is recommended for broadcast use.

Reported by

Fraunhofer Gesellschaft e.V.
Am Wolfsmantel 33
91058 Erlangen
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