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A Time-Frequency Auditory Model Using Wavelet Packets
A time-frequency auditory model is presented. The model uses the wavelet packet analysis as the preprocessor. The auditory filters are modeled by the rounded exponential filters and the excitation is smoothed by a window function. By comparing time-frequency excitation patterns it is shown that the change in the time-frequency excitation pattern introduced when a test tone at masked threshold is added to the masker is approximately equal to 7 dB for all types of maskers. The classic detection ratio therefore overrates the detection efficiency of the auditory system.
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