Convolution-What's τ got to do with it?

This video explains where the tau in the continuous-time convolution integral comes from and what it means. This video was created to support courses in the Engineering Department on the Polytechnic campus of Arizona State University. Links to other videos can be found at http://www.engineeringvideos.org and http://sites.google.com/a/asu.edu/signals-and-systems This video is made available under the Creative Commons BY-SA license.