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Lecture
S4
Muddiest
Points
General Comments
Not many students in class today, presumably because of Spring Break. Enjoy Spring Break, but
please be prepared when you come back to learn more Signals!
Responses to MuddiestPartoftheLecture Cards
(20 cards)
1.
Is there a more intel ligent 18.03 way of solving the impulse response?
(1
student)
Yes, you can use Laplace techniques, which we will get to shortly.
2.
What does convolution physically represent? (1)
That’s a tough question to answer,
and here’s why: We’ve made two (physical) assumptions about our systems, namely, that
they are both linear and timeinvariant. At least when we’re dealing with generic LTI
systems, that’s all the physics we can assume. So everything that we derive thereafter is a
consequence of those two assumptions. So the simplest answer is that convolution is a
consequence of the LTI assumption, and not much more can be said.
However, if you look carefully at the convolution integral, you can begin to get some insight
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 Fall '05
 MarkDrela

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