Some clarification is needed.
For sake of discussion, let's assum that each step is 1 second.
For t < 600, the output should be 0?
For 600 <= t < 1200, the output should be held at the average value over 0 <= t <= 600?
What should the output be from 1200 <= t < 1800? This is the key question?
Then for 1800 <= t < 2400 the output should be held at the average value of over 1200 <= t <= 1800. Correct?
