Abstract
The threshold for detecting a tonal signal in a continuous broadband noise increases with increasing signal frequency for long, but not for short signal durations. This is revealed by an analysis of previous studies, and confirmed with three subjects in the present experiment using signals covering a frequency range from 125 to 4000 Hz and a duration range from 2 to 1000 ms. The relationship between threshold and signal frequency for a wide range of signal durations is explained by an energy-detector model in which the time window is assumed to match the signal duration and the predicted signal level is adjusted to compensate for the loss of signal energy due to spectral spread at short durations.
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