Abstract
A series of investigations have been conducted to determine to what extent one may predict the aural detectibility of a complex signal in a background of masking noise. Observers were tested binaurally using the two-alternative forced-choice procedure to obtain psychometric functions for simple signals. Modeling the auditory system as an energy detector preceded by a set of bandpass filters, and knowing the statistics of the masking noise and signal plus noise distributions, one may determine the difference distribution statistic upon which the auditory system bases its decisions. The psychometric functions allow one to determine the inefficiency factor for the auditory system and, combining this knowledge with the difference distribution statistics, it is possible to develop a procedure for predicting the detectibility of various complex signals. The results of tests with signals consisting of various combinations of tones and noise will be compared with predictions. Limitations will be discussed.
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