Abstract
Two-tone masking of a 1000-Hz narrow-band noise by high-level masking tones (60–100 dB SPL) yielded notches in the resulting two-tone masking functions. As orginally demonstrated by Zwicker [Acustica 4, 415–420 (1954)], those notches occurred at large frequency separations between masking tones. In a search for an adequate explanation of those notches, reversed masking functions were obtained for the 1000-Hz narrow-hand noise masked by constant-intensity single-tone maskers at frequencies above the 1000-Hz narrow-band noise and at frequencies below the 1000-Hz narrow-band noise. In further experiments, selective off-frequency masking was employed at frequency regions of suspected distortion components. The results indicated (1) that the notch obtained in two-tone masking functions is due primarily to the lower-frequency tone of the two-tone masking complex; (2) that the frequency separation at which the notch occurs is dependent upon the level of the masking tones; and (3) that the notch can be eliminated with selective off-frequency masking. Alternative explanations for the notch are discussed which include the detection of off-frequency distortion components and/or limitations in the temporal resolving power of the auditory system. [Work supported in part by NIH grants NS-10561, NS-12125, and NS-04105].
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