Signal Detection as a Function of Frequency Ensemble. I

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Abstract
Signal ensemble size means the number of signals of different frequency that are equally likely to occur and which the observer must try to detect. Ensemble frequency range means the frequency separation between the lowest and the highest frequency signals included in that ensemble. Data are presented for 4 observers who took part in the experiment. The results obtained are compared with predictions based upon 3 mathematical models. Using efficiency measures, the results obtained are also compared with performance expected of a mathematically optimum detector. The possibility is suggested that the models discussed are not necessarily mutually exclusive, but rather complementary in the over-all view of detection.

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