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New High Data Rate Audio Watermarking Based on SCS (Scalar Costa Scheme)
Nowadays, distribution of audio material is not limited to physical media anymore. Instead, distribution via Internet is of increasing importance. In order to attach additional information to the audio content, either for forensic or digital rights management purposes or for annotation purposes, watermarking is a promising technique since it is independent of the audio format and transmission technology. State-of-the-art spread spectrum watermarking systems can offer high robustness against unintentional and intentional signal modifications. However, their data rate is typically comparatively low, often below 100 bit/s. This paper describes the adaptation of a new watermarking scheme called Scalar Costa Scheme (SCS), which is based on dithered quantization of audio signals. In order to fulfill the demands of high quality audio signal processing, modifications of the basic SCS scheme, such as the introduction of a psychoacoustic model and new algorithms to determine quantization intervals are required. Simulation figures and results of a sample implementation, which show the potential of this new watermarking scheme, are presented in this paper along with a short theoretical introduction to the SCS watermarking scheme.
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