And you find  They get peaks.
OK. So when one person is speaking , then wherever they happen to be at the point when they 're speaking ,  then there 's a pretty big maximum right around that point in the l in  in the lag.
OK. OK.
So if  at whatever angle you are ,  at some lag corresponding to the time difference between the two there , you get this boost in the  in  in the cross - correlation value  function.