People who code: we want your input. Take the Survey

# Tag Info

You could use cross correlation for this purpose. For an uncorrelated signal $x(t)$, $\textrm{corr}(x(t), x(t + \Delta t)) = c \delta(\Delta t)$, i.e. an delayed impulse. This can be expanded to comprise multiple echoed copies  \textrm{corr}\left( \sum_{i=0}^{N} a_i x(t + \Delta t_i), \sum_{j=0}^{N} b_j x(t + \Delta t_j) \right) = c \sum_{i=0}^{N} \sum_{...