Hello?
Anyone?
In this lecture, we will talk about some basic concepts.
We've.
Uh, we already clear the signal is a more general and abstract concept, which is almost anything.
Carry information.
A signal has no physical menace.
Thestation.
How about a week?
We always heard we got a signal once a week.
We is a physical phenomenon.
We can use it to try to transmit signals.
We can be model and measured and we will Yuri include in gross peri tea.
It is refers to the time taking to complete one oscillation, i.e. a circle from one peak or crest to
the next, or from any point to next.
A melting point.
Yeah.
This is period from this peak or crest to another or any point to to the next melting point.
Another is an amplitude.
We are use a it refers to the highest from the center line to the peak o to the right.
To the peak.
This part of the track is part.
Another term is frequency.
It is a number of oscillation per unit of time.
How about the frequency and the purity?
What's the relationship between so.
F is 140 and the period to.
The purity.
Equal to one divided by F.
Take the Essiet unit, the international single unit system unit for frequency is the circle per second.
Which is defined to be stress and short form is HD.
Why is there.
Is equal to.
Six divided by seven.
Is equal to one or s.
It.
There's another word in the term we use.
We've lots.
It is the defense or which we repeat, which can be defined as the distance between two successive crest
or froth of a we.
If we were to use lambda lambda as the core velocity, the speed divided by frequency is equal to we
divide it by F.
The principle is that the higher the frequency, the short the people are.
And the lower the frequency, the longer that we've lost.
Yep.
You can see this is the limiter, to be blunt.
Yeah.
Or from here to here.
How about a t u c, lambda and cheap.
Almost a similar face, but.
Land that we've lost is a distance, but a t is a time that.
Concept.
Domain time domain.
This period is almost the same.
But why is this case?
Not this time.
Okay.
Thank you.
See you in the next lecture.