In this chapter psycho-physical methods which are useful for both psycho-acoustics and sound-quality engineering will be discussed, namely, the meth-ods of random access, the semantic differential, category scaling and magnitude estimation. Models of basic psycho-acoustic quantities like loudness, sharpness and roughness as well as composite metrics like psycho-acoustic annoyance will be in-troduced, and their application to sound-quality design will be explained. For some studies on sound quality the results of auditory evaluations will be compared to pre-dictions from algorithmic models. Further, influences of the image of brand names as well as of the meaning of sound on sound-quality evaluation will be reported. Finally, the effects of visual cues on sound-quality ratings will be mentioned.
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