Echo parameter estimation using autocorrelation

Hello,
We know that the autocorrelation of ana echoed signal contains peaks
at points points 0,N and -N (which N is the delay of echo) and this
fact can be used to estimate delay parameter of the echo and then
remove that . These peaks cab be easily detected by human eye. But how
do we find them automatically (using matlab code for example). There
are may local optimums in a typical correlation sequence of a wave
file. How do we know which of them is the echo-made peak? We don't
have the original signal, Only the echoed one.
Would anybody help me?
Thanks.

.

Relevant Pages

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