Abstract
Consider a pulsed sinusoid of 110-sec duration partially masked by white noise. It is well known that the level of signal must be varied linearly with the level of the noise to maintain some constant degree of masking. That is, the degree of masking is constant if the signal-to-noise ratio is constant. A similar relationship holds for a pulsed tone masked by a continuous sinusoid of the same frequency. Suppose, in separate experiments, the level of noise and level of the continuous sinusoid are adjusted so that each has equal masking effectiveness on a signal of some given level. If now the noise and sine-wave masker are combined, how much must the level of the signal be increased in order to achieve the same level of masking effectiveness as before? Rather than 3 db or some lesser number, the increase appears to be somewhere between 6 and 8 db. Other experiments related to this phenomena are discussed. [This work was supported by the U. S. Army Signal Corps, the U. S. Air Force (Operational Applications Laboratory and the Office of Scientific Research), the Office of Naval Research, and the National Science Foundation.]
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