The modified window correlation technique for estimation of arbitrary time delays in multichannel, multievent systems
Ben-Chung Jan, Juan A. Henriquez, Terry E. Riemer, Russell Trahan · The Journal of the Acoustical Society of America · 1993
In a previous paper, the so-called window-correlation technique [Callison et al., J. Acoust. Soc. Am. 81, 1000–1006 (1987)], a method for estimating arbitrary time delays in multichannel, multievent systems, was presented. This method windows a portion of the data record in both channels of a two-channel system, and computes the cross correlation of the data segments. However, the CPU time consumed by this technique becomes prohibitively long for most real time applications. This paper introduces a modification to the above method called the modified window-correlation technique (MWCT) that reduces the CPU time considerably by windowing only one channel and cross correlating the data record in the frequency domain. The simulation results for a two-channel, two-event system show that the MWCT can estimate event delays very accurately down to a signal-to-noise ratio (SNR=mean-square value of signal/mean-square value of noise) of 0 dB.