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We previously proposed an inaudible non-blind digitalaudio watermarking approach based on cochlear delay (CD) characteristics. There are, however, three remaining issues with regard to blinddetectability, frame synchronization related to confidentiality, and reversibility. We attempted to solve these issues in developing the proposed approach by taking blind-detectability and reversibility of audio watermarking into consideration. Frame synchronization was also incorporated into the proposed approach to improve confidentiality. We evaluated inaudibility, robustness, and reversibility with the new approach by carrying out three objective tests (PEAQ, LSD, and bit-detection or SNR) and six robustness tests. The results revealed that inaudible, robust, blindlydetectable, and semi-reversible watermarking based on CD could be accomplished. key words: cochlear delay characteristics, chirp z-transform, inaudibility, blind detection, frame synchronization, semi-reversible watermarking

Robust, Blindly-Detectable, and Semi-Reversible Technique of Audio Watermarking Based on Cochlear Delay Characteristics