关键词: 时延估计, 广义互相关, 二次相关, 相关峰精确插值

Abstract: Sound source localization based on Time Delay Estimation（TDE） is one of the core of the algorithm in hearing aids. However, the estimation accuracy is often affected by the sampling rate and noise, which leads to the inaccuracy of location. In order to solve the problem, in this paper, combined with Fine Interpolation of Correlation Peak method（FICP）, an improved generalized cross correlation algorithm based on second correlation is proposed. In the proposed method, second correlation is adopted to reduce the interference of noise, FICP is used to improve the resolution of correlation function. The simulation results show that under both low SNR and high SNR environments, the proposed method can improve the performance of time delay estimation significantly.

Key words: time delay estimation, generalized cross correlation, second correlation, fine interpolation of correlation peak