Relative contribution of frequency and time difference to selectivity for interaural time difference

It is a significant way to explore the perceptual mechanism of Interaural Time Difference(ITD) by discovering the relative contribution of frequency and time difference to selectivity for ITD.Seven values of ITD is selected discretely and inhomogeneous in accordance with qualitative analysis of perceptual characteristics for ITD:0 μs,40 μs,100 μs,200 μs,350 μs,500 μs and 700 μs.The section of low frequency is divided into 12 sub-bands based on the division method of critical band.A self-adaption test method contained the traditional test methods such as 1 up/2 down and 2 AFC is taken.The test sequences are chosen as narrowband Gaussian white noise in order to avoid phase aliasing.The experiment results demonstrate that:ITD threshold changes more significantly with frequency,and the minimum value occurs at about 500 Hz while the maximum values correspond to both side bands and the threshold increases as the ITD of the standard increasing.