Communication is the exchange of information by different means.
It is an activity that began even before the civilization of human beings; however, over time, as technology progressed, different modes of communication also developed, including telecommunications and wireless communications.
In the world of today 'hui, information and communication technologies play an important role in almost all the activities we do.
Types of communication
Depending on progress and From the technology mode, telecommunications are classified as follows:
- Wireless communication
Now let's talk about each category -
Telecommunication is a technique for transmitting information fromone place to another by electromagnetic means.
Different types of information can be transferred through a telecommunication system, such as voice, text, images, etc.
Modern telecommunication Telecommunication system
The modern form of telecommunication involves computer technology and is capable of transferring a wide range of data including audio, video, text, many more computer files.
Main components of the telecommunications are -
Hardware - For example, the computer system and modems.
Software - This controls computer programs.
Media - This is the communication socket, wired or wireless.
Network - This technology connects
Protocols - These rules govern theinformation transmission and communication system.
Wireless communication is a technique of transmitting information or power between two or more points, which are not in actually not connected to the physical wire / conductor.
The most common wireless technology uses "radio waves". Another technology is microwave transmission.
The first wireless telephone communication in the world took place in 1880. This was experienced by Alexander Graham Bell and Charles Summer Tainter. Both invented and patented the “photophone”.
The photophone was a kind of telephone, which conducted wireless audio conversations on modulated light beams, that is, electromagnetic waves.
However, in the 21 st century, the invention of cell phones radically changed the concept of communication system and made the communication system available.wireless communication even in remote areas of the country.
Modulation is one of the most important processes by which the characteristics of a carrier wave vary depending on an information signal.
In telecommunications, modulation is the process of transmitting a message signal inside another signal so that it can be physically transmitted. Likewise, modulating a sine waveform transforms the narrow frequency range baseband message signal into a passband signal to pass through a filter.
Demodulation is the reverse process of modulation which changes the signal and makes it understandable to the user.
A modulator is a device that performs the modulation process.
The demodulator is a device that performs a modulation process inverses or inverse of the modulation.
Modem is a device that performs both the process of modulation and demodulation.
Types of Modulation
Now let's see what the different types of modulation are -
Analog Modules tion
The waves are continuously varying here and transfer signals; for example, audio signal, television signal, etc.
It remains in the form of a discrete pulse, ie "on" or "off". In this technology all forms of data are used via binary digits, i.e. series of '0 ' and '1. '
In this section we will see the different modulation methods -
Amplitude modulation (AM)
In this method, force or signal carrier strength varies. This means that the data is added to the signal.
In this modulation, the frequency of the carrier waveform varies; this reflects the frequency of the data.
Phase modulation (PM) - This is somewhat similar to FM, but not the same.