Welcome to this section in this section, we are going to discuss about the communication blocks and
some elements.
Moreover, we also come to an agreement, Mr. Communication.
So the objective of our communication system is that we are sending we can accept any information.
Suppose we are sending this block A, B and C..
So what would be the objective?
We can accept it and see.
But in case in will, this does not happens, sending ABC, we cannot receive you exactly as much as
100 percent.
So what is the objective, the objective in this case?
You can minimize the loss.
It can be ninety nine point nine, nine percent or less.
So we can minimize this loss using different methods.
Along with that, we provide security to the user.
So this is a bit of a communication system.
It consists of four different elements, such as transducer, prosecutors, Agenor, perceiver and duesler.
So we are going to discuss each and every element in it.
So first, we have a source, this source can be any information, Maria.
It can be audio, you boys word, picture, anything.
So basically the source is in the physical form.
So if it is in a physical form, then you can trust with you.
Of course, our circuitry in this section on the signal so I can transmit a physical signal to an electrical.
So then we have to use it.
So this is the first user.
What transducer do transducer convert energy from one form to another?
So it's a kind of a converted.
You can see it so it can convert the signal to electrical signal or any other form, or it can convert
and signal to discuss.
So we have a signal here.
Then we have a solution which convert into electrical signals.
The transducer can be a for.
You can see here, this is the microphone, so it can work and or use really good electrical signals
or it can be difficult to detect which converts light signal into electrical signal.
And then we have a prosecutor, so the prosecutor just sort of equipment that's used to generate an
electromagnetic waves, a signal.
So it just it is going to generate a signal and we would get the help that we can discuss it more in
the U.S. then we have a channel.
So then we have a channel.
So this channel and the new Wired, but you can see here, so what channel do that signal propagation
medium and you can see where the various so the channel can be.
It should be, it can be belayer or it can be a but less.
CNN.
So you can see here, this is a different kind of.
So it is OK to stick.
There are two keepers there to serve each other.
Then we have a verbal communication.
You can see there are multiple layers going like this.
And so the channel can be using up valuable communication.
Then we have a quick people or we have optical fibre.
So in the optical fibre, we can achieve that in terms of tips.
So they are very much highly efficient.
Moreover, the free space in the case of free speech is suppose we have a trust get here and we have
an idea.
Similarly, in the civil section, we have Encina.
And so there is serious action so we can transmit the signals in air and we can receive the signals
in.
Received the scene at the.
So this is called free space or so dependent on the requirements, the Channel and the Wire or the channel
and we this.
Next one is the noise, so noise is a kind of unwanted signal that interferes with the signal, the
noise declared the signal quality.
Suppose this is my actual signal.
It is very much clean when it pass through the channel.
So this is our agenda when it comes to the agenda and the noises introduced in this one.
Then we have this one.
So my signal is declared.
So the objective, say, to remove this extra.
Then we have a receiver, so receiver is a device that picks up the radio signal and deliver information
extracted from it, so and the receiver say we have we have the signal to the receiver state is desired
information from it.
And then it goes to the just do it again.
That, as you said, and what the electrical signals to the signal and their destination.
Suppose we have to send a speaker, then we can decode our signal and you can send the audio.
So obviously this is a very generic representation of a communication system where there are signals,
electrical signals, which can combine electrical signals.
So we can define the communication system as analog communication, not the still communication in the
case of an efficiency and communication.
You can see we had a little bit of me in the face of this earth.
You can see the stream of one zero zero one.
So what is the disadvantage of analog communication?
There is no privacy, no option, as we cannot provide any kind of putting this on.
That's actually there is no privacy in the.
Well, in the case of this little communication, there is a premise because we have to keep in the
distance and it can be encrypted.
The second thing from the point of view and a lot of communication, so we cannot get from different
sources.
Suppose if you have or you.
If you have you.
Or you have a different view to.
Different data.
So it's not much all things and simultaneously, if you must, all of those things, then they will
cause an interference in the case of Mr.
You can modify that different data and voice or you can do any.
Moreover, it seems that the U.S. does not have an addiction to oil that is still you shouldn't have
an inspection capability, so the example of a little competition can have them, or B, there is no
real motivation was his motivation.
Similarly, in the case of forests of Asia, one example can be both good population, that is.
So seeing that one picture of the competition in this era, everything is moving to there is still communication.
So now we're going to discuss the digital communication system and how it is that is and this is the
very basic and fundamental role which will contribute to us.
What did you find with you?
So you can see here we have a source.
This is the source.
Then we have a transducer.
So we have a signal that skillful and perplexing to the class who said this is converted into bricks.
So this section gingered signal and convert it into the signal.
So we have some kind of signal, then what do you do?
Source encoding.
Suppose if we converted this signal because, for example, suppose this is the objects, these are
the different routes it can be.
And from these groups, some groups are useful and some people or extra or you can say these are not
useful.
So in the case of souls, including what we do, we try to extract.
So that system could be used and how can we increase it?
Can we?
Because we can no more number good.
Using the same resources because we've been teaching for extra information.
What do you do watch and including CNN, including some kind of.
Why, while we do it and then including because we want to immunize of a situation, so there is a noise
as we see it, which affects the signal.
So therefore provide the noise immunity to the channel, including we extra extraverts.
So there it can be immune to the noise.
Then we met these boots to the symbol, so is called symbol modulation.
Up to this point, our signal is discrete or in the distant future, forever.
We have lost the signal.
So for the we of this signal, we have to convert into another signal.
So you can see here we have a device or disturb to analog converter.
That converter is convert.
That is a signal to the analog signal over the use of conversion support.
If you want to transmit the signal frequency of two gigahertz, then we have a mixer here and then we
have a mixer here which will transmit price signal to the frequency to two yards.
And then we use a power bluefire, which is used to enhance the power of this input signal.
So it's kind of boosting the signal power or you can see proper enhancement.
Then we have an antenna.
And it's the kind of converter which converts the signal to electromagnetic signals so that it can get
the free space.
So this section cover the transmitter part.
So this is the best part.
Then it goes to the receiver signal.
And that's what we have an idea where we see the signal from the.
Since the received signal has very low signal strength, less signal power, then we use a nice amplifier.
The low noise amplified enhances the signal power that what we do since we converted the frequency supports
it was gigahertz frequency.
Now we have the frequency so that it's come to this this same level and it can be destroyed.
So using that converts we weeks we reduce the frequency of the received signal.
Then we have the same inverse of the digital converter.
Using analog to digital convert, we convert analog signal industry to digital from.
No sense in the use of symbol modulation.
He has two symbols.
No, he performed the inverse process here at the symbol, which it is called symbol demolition of the
symbol.
DEMOLISHER As seen earlier, we have added redundancy so that it provides to the community it providing
people the noise.
So in this section, what we do is we remove the extraverts.
What we hear after that, the since the video moved from here.
So we know what we think, then we can actually get here.
So they're like complete signal is used.
And again, this is a form of electrical signal and you cannot understand are the human.
So using a user we convert to article form or they will form so that you understand this.
And if I leave with a signal signal.
So it is a
communication system where the senior executives have seven or 10 percent up in the analog system.
Same thing can be seen in this section.
We have learned about the communication system and communication system and digital communications,
digital communications and the next section you have to learn the software defined data.
And please remember this, because this is the one network that you have.
So this is a software defined.
This is a.