Auditory filter shapes in forward masking as a function of level

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Abstract
Thresholds were measured for 1-kHz, 5-ms sinusoidal signals following [human] noise maskers with a spectral notch of variable width centered at 1 kHz. In 1 set of conditions threshold was measured as a function of notch width for 3 fixed noise levels: 30, 40 and 50 dB SPL[sound pressure level]/Hz. To compensate for the decay of masking, each signal threshold was transformed to the level of a flat-spectrum noise which would give the same masking effect. In a 2nd set of conditions the noise level required for threshold was measured as a function of notch width for 3 fixed signal levels, separated by 5 dB. The auditory filters derived from the data were essentially the same for the 2 sets of conditions, and did not vary significantly with masker or signal levels. The filters had a mean 3-dB bandwidth of 90 Hz.

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