Abstract
A series of studies was undertaken to determine the loudness-level of signals whose amplitude changes 10 dB in 1.3-dB discrete steps. Eight different test signals were compared with a steady-state reference signal and with each other at duration times from 0.5 to 10 s. Listeners determined equal loudness points using the two-alternative forced-choice technique. Loudness-level of amplitude varying signals is determined by their envelope shape rather than by whether they are increasing or decreasing in intensity. Order and duration had little effect on loudness-level. Loudness summation did not change significantly over time with experienced listeners. Loudness enhancement did not change until an intraburst interval of approximately two seconds had been reached. The former results agree with Zwislocki et al. [J. J. Zwislocki, I. Ketkar, M. W. Cannon, and R. H. Nodar, Percept. Psychophys. 16, 91–95 (1974)]; the latter would not have been predicted over durations as long as 2 s.
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