The point of cross-correlation is to determine if two signals are similar or not and to which degree. If they are different, no matter the offset, the cross-correlation value will be very small (close to 0). In the case of auto-correlation, the signal is cross-correlated to itself. So, it will be always picked (1.0) at 0 lag.

In reply to Re^5: Calculating cross-correlation by Anonymous Monk
in thread Calculating cross-correlation by Anonymous Monk

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