Enhanced transform-domain correlation-based audio watermarking

Various watermarking techniques have been proposed so far, aiming at the copyright protection of audio signals. Little effort has been made, however, in taking under consideration the spectrum of the watermark sequence itself and exploiting its frequency properties. An enhanced audio watermarking technique, based on correlation detection, is introduced in this paper, where high-frequency chaotic watermarks are multiplicatively embedded in the low frequencies of the DFT domain. A series of experiments have been conducted to demonstrate both detection reliability and robustness against attacks.