Increasing robustness of an audio watermark using turbo codes

Authors:
N. Cvejic;D. Tujkovic;T. Seppanen
Affiliations:
Center for Wireless Commun., Oulu Univ., Finland;Center for Wireless Commun., Oulu Univ., Finland;Center for Wireless Commun., Oulu Univ., Finland
Venue:
ICME '03 Proceedings of the 2003 International Conference on Multimedia and Expo - Volume 2
Year:
2003

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Abstract

Standard spread spectrum audio watermarking algorithms offer BER unacceptable for reliable transmission of data. Causes of unreliable watermark detection are often attacks that distort the watermarked audio in fading-like manner, disabling the correlation-based detectors to extract data. In this paper, consideration of capacity of the audio watermark channel in the presence of fading-like distortion is performed. It is shown that turbo codes offer convenient trade-off between capacity of the watermark channel and BER due to large coding gain in fading environment. Test results proved a large advantage of the proposed algorithm over standard detection as robustness is significantly increased for a given watermark data rate.