Earlier this summer I gave a talk at RIT’s Summer Math Institute. This is a venue for STEM (science, technology, engineering, and mathematics) University and High School faculty to interact. One of the goals is to show to High School teachers how the concepts they teach are used in many of today’s technologies. So, my presentation was about explaining how most of what we do in DSP revolves around the simple operation of accumulating the multiplication of two sequences of numbers (plus complex numbers and trigonometry):

I think it is a nice way of introducing the basics of Digital Signal Processing to a general audience.