Soundscape suggests exploring the acoustics of an environment in its complexity and its ambivalence. Therefore, soundscape research does not conceive sound alone but reconceive the condition and purpose of its production, perception, evaluation which account for a human-centered point of view. Sound sources attribute "meanings" to the exposed and block or enable human activities, thoughts, feelings. One major difficulty is to put together within the integrated concept of meaning the pieces of knowledge. The challenge is to elaborate the new indicators which relate the physical measurements to sound perception and evaluations. It is important to recognize that among varying soundscape types the relationship between physical and perceptual parameters will have similarities, but the relationship will also have unique properties tied to each specific ambience. Moreover, important is the "new" understanding of expertise.
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