Abstract
Several models of the auditory system in which the signal flows along parallel channels were investigated. Some of the models studied exhibit nonlinear lateral interaction between channels. The effects of both single and multiple formant excitation and of intrinsic noise were considered. Performance was evaluated in terms of the signal-to-noise density ratio corresponding to a desired probability of correct detection given the presence of such signals for varying constraints on system information capacity, bandwidth, and complexity. Of particular significance to the analysis was the adoption of a fixed false-alarm rate (Neyman-Pearson relation) in favor of the common Bayes Criterion. A series of psychoacoustic tests were conducted, and the results of these tests, as well as published results by other investigators, were compared to the performance of the model. The data indicate that parallel-channels models in general exhibit excellent noise performance and that, when used in conjunction with lateral interaction, they can successfully model many psychoacoustical phenomena.
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