Time difference calculation based on signal starting point detection

The research of the high-precision sound source localization system which is based on time difference of arrival (TDOA) of different sensors positioning system has increasingly become popular research. The outcome of the traditional generalized cross-correlation function (GCC) time delay estimation algorithm which is under the condition of the intense noise, has an apparent error, therefore, we can´t guarantee the accuracy of the positioning system. In this paper, we put forward a spectral entropy-double threshold endpoint detection algorithm, through obtaining the exactly starting time of source sound to get a time difference, then improving it. Experiments show that the algorithm has the characteristic of simple process, small amount of computation and accuracy. It is much suitable for DSP and small system time difference estimation module.