Term Project # 04 

Digital Audio Watermarking The real origin of watermarking can be found in the old art of steganography. Although the goal of cryptography is to render a message unintelligible, steganography attempts to hide the very presence of a message by embedding it into other information. Audio watermarking started in the 1990s as a modern and very technical version of playing cat and mouse. The music industry, dominated by the “big four” record groups, also known as the “Majors” (Sony BMG, EMI, Universal, and Warner), quickly realized that the availability of digital media for music recordings expose their business to a great danger: that of piracy of intellectual property rights. Being able to insert proprietary marks in the media without affecting audio quality (i.e., in a “transparent way”) was then recognized as a first step toward solving this issue. This project aims at developing watermarking system whose design is based on classical communication systems using spread spectrum modulation. Key wards: Digital communication design, spread spectrum, audio watermarking, informed watermarking, perceptual shaping filter, Wiener filter

Getting Started: ¾ first generate a water mask message as an array of characters by typing the message within single quotes and assign it to any variable eg: mes=’welcome’ ¾ then convert it into corresponding bit stream using ‘dec2bin’ function of MATLAB

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