Thread: Cross Correlation and Convolution

I'm trying to follow a simple textbook explanation of cross correlation:

Where indicates cross correlation, indicates convolution, and would be the complex conjugate of :



Substituting , we have:



Then, the next step is where I'm confused. How do you get from the last step to:

There's an error in the previous step. Making the variable substition will also invert the sign of the limits, so switching them around will cancel the minus sign.

Originally Posted by Ridley

There's an error in the previous step. Making the variable substition will also invert the sign of the limits, so switching them around will cancel the minus sign.

Of course! Thanks!