\(x_1[n]\)

\(y_1[n]\)

Figure 1: Block diagram for the 1st difference filter. The system is an FIR filter and therefore time invariant. Click on the above input, system block or output for a "close-up."

\(x_1[n-3]\)

\(y_2[n]\)

Figure 2: Delayed version of the input through the 1st difference filter. Since the system is time invariant, the output \(y_2\) should be the same as \(y_1[n-3]\). Click on the output to verify this fact.