Masking with Two Tones

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Abstract
The masking produced by 2, equal-intensity sinusoids on a single, a 3rd sinusoid located midway in frequency between the 2 maskers, was measured as a function of the frequency separation between the 2 maskers. Three signal frequencies were used: 250, 1000, and 4000 cps. At small frequency separations, the detectability of the signal is independent of center frequency and dependent on the frequency separation of the 2 maskers. As larger frequency separations are approached, the masking suddenly diminishes and this larger critical frequency, separation, which is frequency-dependent, is approximately the width of the envelope of excitation on the basilar membrane when excited by a sinusoid. The interpretation of these results in terms of a simple energy detector followed by a simple integrator is discussed.

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