In this study two so-called -psychoacoustic processors- are examined exemplarily by applying concepts, models, and methods of scientific psychoacoustics. Physical measurements of processed sounds and results of hearing experiments on speech intelligibility and sound quality (Aural Exciter) and loudness (Loudness Maximizer) are presented and discussed with regard to classic psychoacoustic models and potential new applications. Therefore relevant psychoacoustic facts, in particular the perception of nonlinear distortion, are reviewed.:
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