A new informed spread spectrum embedding for robust audio watermarking

This paper presents a new embedding strategy to extend the performance bound of spread spectrum (SS) based watermarking by introducing more imperceptible distortions measured in the mean square errors (MSE). The potential of the host is sufficiently exploited and utilized to maximize the watermark robustness. This strategy is then realized in audio watermarking by adaptively inverting the host according to the correlation between the host and the modulated watermark sequence. The MSE embedding distortions can reach up to twice of the host power, while the perceptual distortions are effectively controlled. By utilizing more available host, the proposed method exhibits much better robustness than existing SS-based watermarking.