Abstract
A critical duration was found, below which two acoustic bursts differing in their envelope curves are indiscriminable, and above which they sound different. The method of limits was used. Both bursts to be compared had the same energy, the same peak intensity, and the same carrier signal. The influence of the type of the carrier signal (tone or noise of different bandwidths), of its central frequency (250, 1000, and 4000 Hz), and of the shape of bursts on the critical duration was determined. Three shapes—Gaussian, divergent triangle (ramp up), and convergent triangle (ramp down)—were compared. With one exception the influence of factors mentioned above is small. The critical duration, expressed as the duration of a rectangular burst of the same energy and peak intensity, was found to be about 2 msec, except for the ramp up-ramp down combination with the carrier at 4 kHz, for which the critical duration is 1 msec.
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