High-quality audio coding finds its roots in the speech coding arena where research activity not only historically produced the first coding solutions and standards but also increased attention to the importance of modeling perceptual phenomena. This paper tracks the evolution of the perceptual audio coding concept by identifying its importance to reference speech, wide-band speech, and high-quality audio coders. The paper reviews representative algorithms, with an emphasis on the state of the art as well as future developments and technological trends.
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