Audio watermarking is a technique for the transmission of additional data along with audio material within existing distribution channels. Recent research has produced a number of algorithms for the embedding and retrieval of watermarks in audio signals. While most known systems operate in the linear domain, few are capable of embedding watermarks into compressed material. This paper investigates the different areas of applications and their specific requirements with respect to watermarking technology. Both watermarking in linear and compressed domain are contrasted in their concepts and properties, and recent technological advances are described.:
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