IGI Global, 2007. — 345 p.Recent development of the Internet and the digital information revolution caused significant changes in the global society, ranging from the influence on the world economy to the way people nowadays communicate. Broadband communication networks and multimedia data available in a digital format (images, audio, and video) opened many challenges and opportunities for innovation. Versatile and simple-touse software and decreasing prices of digital devices (e.g., digital photo cameras, camcorders, portable CD and mp3 players, CD and DVD recorders, laptops, etc.) have made it possible for consumers from all over the world to create, edit, and exchange multimedia data. Broadband Internet connections and almost an errorless transmission of data facilitate people to distribute large multimedia files and make identical digital copies of them. Digital media files do not suffer from any quality loss due to multiple copying processes, such as analogue audio and VHS tapes. Furthermore, recording medium and distribution networks for analogue multimedia are more expensive. These advantages of digital media over the analogue ones transform to disadvantages with respect to the intellectual rights management because of a possibility for unlimited copying without a loss of fidelity cause a considerable financial loss for copyright holders. The ease of content modification and a perfect reproduction in digital domain have promoted the protection of intellectual ownership and the prevention of the unauthorized tampering of multimedia data to become an important technological and research issue. Therefore, the traditional methods for copyright protection of multimedia data are no longer sufficient. Hardware-based copy protection systems have already been easily circumvented for the analogue media. Hacking of digital media systems is even easier due to the availability of general multimedia processing platforms, for example, a personal computer. Simple protection mechanisms that were based on the information embedded into header bits of the digital file are useless because header information can easily be removed by a simple change of data format, which does not affect the fidelity of media. Encryption of digital multimedia prevents access to the multimedia content to an individual without a proper decryption key. Therefore, content providers get paid for the delivery of perceivable multimedia, and each client that has paid the royalties must be able to decrypt a received file properly. Once the multimedia has been decrypted, it can be repeatedly copied and distributed without any obstacles. Modern software and broadband Internet provide the tools to perform it quickly and without much effort and deep technical knowledge.Introduction to Digital Audio Watermarking Spread Spectrum for Digital Audio Watermarking Audio Watermarking Through Parametric Synthesis Models Robust Zero-Bit and Multi-Bit Audio Watermarking Using Correlation Detection and Chaotic Three Techniques of Digital Audio Watermarking Advanced Audio Watermarking Based on Echo Hiding: Time-Spread Echo Hiding Analysis-by-Synthesis Echo Watermarking Robustness Analysis of Patchwork Watermarking Schemes Time-Frequency Analysis of Digital Audio Watermarking Digital Audio Watermarking Techniques for MP3 Audio Files Digital Watermarking of Speech Signals Robustness against DA/AD Conversion: Concepts, Challenges, and Examples Subjective and Objective Quality Evaluation of Watermarked Audio Watermarking Security
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