Abstract
Determinations of effective masking bandwidths at low frequencies are scarce because of inherent difficulties in such experimentation, including needs for very high signal levels and very quiet listening conditions. The current experimentation was undertaken to estimate signal to noise ratios associated with three levels of detection performance in a two alternative forced choice task at six frequencies between 40 and 1000 Hz. Both signals and noise backgrounds were presented to observers by loudspeaker in an anechoic chamber. Effective masking bandwidths (inferred by the critical ratio method) were observed to decrease from 1000 to 250 Hz, and then to increase substantially at lower frequencies. [Research sponsored by the Applied Technology Laboratory, U.S. Army Aviation Research and Development Command.]
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