A companion paper evolved a method for estimating the detectability, audibility and loudness of noises and distortions by calculating masked excitation and loudness patterns for a signal as well as returning a single-number loudness estimation. This first step concentrated on steady-state measurements. How do we transfer such knowledge to predict the significance of errors on programme material? To succeed even partially would improve the fact/fantasy ratio! With this goal, the author concentrates on several relevant non-linear perceptual phenomena and mechanisms. Guidelines are then developed for minimally audible distortions, noise, noise modulations and other errors. Central to estimating the significance of an error is to account for loudness and spatial context, and to quantify the non-linear perceptual processes involved in the formation of external acoustic objects. The paper addresses difficulties of A/B and nulling tests.
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