# audio signal time delay estimation(TDE) in indiviual and separate mics

common TDE problems algorithms(such as GCC) often require audio signals in different mics concurrently, however, is it possible to estimate audio signal time of arrivals(ToA) in different mics separately in the noisy environment in order to estimate TDoA&TDE?

Also, since memory space limitation, cross-correlation related algorithms may not be feasible, starting point detection may be a possible solution(in noisy environment)

for two mics, there is cross-correlation. but some people have also suggested an adaptive LMS filter (one of the mics is the "desired signal", $d[n]$) of some sort and computing some measure of group delay from the FIR coefficients that result in the LMS. something in me makes me think is the Julius Smith/Perry Cook thing, but it might be someone else.