Temporal summation of loudness as a function of frequency and temporal pattern
Résumé
This research is part of a study designed to propose a new model of loudness applicable to impulsive sounds. The purpose of the research was to study the effects of duration, frequency and temporal pattern of the signal on loudness. The aims were to determine: 1) critical duration as a function of frequency, 2) how does the loudness decrease below this critical duration, 3)and whether the results depend on temporal pattern (rectangular signal, signal with exponential decay). To measure loudness we selected the method of adjustment for its good precision/duration compromise. The stimuli used in this study were five pure tones, with durations of 5 ms to 1 s. We will present the values of critical durations that we obtained for rectangular and impulses signals. The time course of loudness change will be describe both for rectangular and exponential-decay patterns. The data of this study, added to results from the literature, are used to make a synthesis on loudness of impulsive sounds. Moreover, new results are given on more natural sounds that have mostly an exponential decay.
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