Convolution: Flip and Drag -- Help
Select the red signal f(t) and the green weight function g(t) using the popdown menus at right. The weight function is graphed at lower right in green. The signal is graphed at bottom left in red. Accessing these menus causes t to be reset to t = -2.
the [t] slider at the bottom to increase t . The function g(t-u) is
drawn in green in the lower left window. The time value is set using a slider under the window. The [>>] key starts an animation. The [<<] key resets t to
In the window above it, the product f(u)g(t-u) is drawn in yellow, and the area between it and the horizontal axis is shaded in blue.
In the top left window, the signed area under f(u)g(t-u) is sketched; this is the value of the convolution f*g at t.
The convolution is graphed in light gray, which is overtraced in cyan as t increases.
2001 H. Hohn