Efficient time delay estimation based on cross-power spectrum phase

Accurate Time Delay Estimation for acoustic signals ac-quired in noisy and reverberant environments is an impor-tant task in many speech processing applications. The Cross-power Spectrum Phase analysis is a popular method that has been demonstrated to perform well even in moderately ad-verse conditions. This paper describes an efcient approach to apply it in the case of static sources. It exploits the linear-ity of the generalized cross-correlation to accumulate infor-mation from a plurality of frames in the time domain. This translates into a reduced computational load and a more ro-bust estimation. Several examples drawn from real and sim-ulated data in typical applications are discussed. 1