A TIME-FREQUENCY AUDITORY MODEL USING WAVELET PACKETS

A time-frequency auditory model is presented. The model uses the wavel et packet analysis as the preprocessor. The auditory filters are model ed by the rounded exponential filters and the excitation is smoothed b y a window function. By comparing time-frequency excitation patterns i t is shown that the change in the time-frequency excitation pattern in troduced when a test tone at masked threshold is added to the masker i s approximately equal to 7 dB for all types of maskers. The classic de tection ratio therefore overrates the detection efficiency of the audi tory system.