So welcome to the lecture today.

We are talking today about analysis of biomedical signals, so the third part of our lecture.

And as always, I want to do a little short test.

So for those of you that already know me, I see a few people using their smartphones

already.

So now you can take out your smartphones or laptop computers and go to www.tweetback.de

and we'll do the short test in a little interactive manner.

So you need to participate in a session.

There's two buttons, really good user interface, and you should not start a new session, but

participate in the new session.

And the session code is C15.

And then you should see a quiz with four answers, ABCD.

And once we have the questions up, you will have the chance to vote.

And then we look at the results together.

Does it work?

Anyone with problems?

All right, let's start.

So we talked about the rule of thumb for testing randomness in a signal, right?

Rule of thumb.

And the question here is which rule of thumb is the valid test for randomness?

ABCD, not much difference here.

So basically, when you have any of these as the answer to the exam question, you'll get

a, you'll in the one point something range.

But we want to be precise.

So what's the only correct answer to this question?

So let's look at the results.

Okay, so I can already let you know that many of you are correct.

So C is the correct answer.

Yeah, okay, now we get a lot more Cs.

Thank you.

So normally I have to stop this quiz.

Stop.

So C is the correct answer.

And you don't get any points, so I don't know your IP number.

I can't follow, trace back who gave the wrong answers.

This is just, so to have this a little bit, to have a little bit more fun here.

So C is the correct answer.

It's two-thirds time n minus two, so the signal length minus two that you are currently looking

at.

And it's not, what do you have?

Oh yeah, it's more.

So more points than two-thirds need to be valid for that question, so it's not answer

A. It's not less than two-thirds of that particular signal window.

And it's not three-quarters.

So the only 1.0 answer, if you want the very best grade, is answer C.

All right.

I need to start a new quiz.

And please don't give any answers yet, because we first need to look at the second question.

Which diagram represents the autocorrelation of a random signal?

ABCD.