Abstract
The effect on loudness of variations in rise time and repetition rate of acoustic transients one millisecond in duration was studied. One possible interpretation of the results is that loudness increases in discrete steps as rise time is reduced continuously. This possibility is considered in relation to data on the loudness critical band and the formation of the critical band at threshold. Five “loudness” calculation methods developed for steady state noise were applied to the Fourier transforms of the transients and compared with the calculated loudness of white noise judged equally loud. The five calculation methods were the Zwicker method, Stevens Mark VI method, Kryter's PNdB method, dBA and dBC. Of these dBA predicts loudness most effectively in the face of variations in rise time and repetition rate of the transients.
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