Byjus Class 10 Maths Notes Communication,Boat Sailing With The Wind 5th,Pdf To Word Mathematical Equations Division,Ncert 10th English Solution Pdf Upload - Reviews
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Communication Communication is the act of transmission and reception of information. Communication System A system comprises of transmitter, communication channel and receiver.
A block diagram of a generalised communication system is shown as below: 3. Receiver Its main function is to decode the original signals. The main function involves picking up the signals, demodulating and displace the original message signal. Communication Channel The physical path between the transmitter and receiver is known as communication channel. They are of two types namely i Guided point-to-point ii Unguided 6. Bandwidth of Communication Channel The range of frequencies used to pass through channel is known as bandwidth.
The following table shows the various things used in communication system. There are two basic modes of communication given as below: i Point-to-point In this type of communication mode, communication takes place over a link between a signal transmitter and a receiver, e.
Basic Terminology used in Electronic Communication Systems i Signal Information converted into electrical form and suitable for transmission is called a signal. Repeaters are used to extend the range of a communication system. Message Signals A time varying electrical signal generated by a transducer out of original signal is termed as message signal.
The electrical signals are of two types such as below: i Analog signal A continuous signal value which at any instant lies within the range Byjus Class 10 Maths Notes Full of a maximum and a minimum value. Graphical representation of analog signal can be represented as given below: ii Digital Signal Pulse Signal Digital signals are those which can take only discrete stepwise values e.
Coding schemes used for digital communication are given as below: i Binary Coded Decimal BCD In this, a digit is represented by two binary numbers 0 or 1. Bandwidth of Signals Bandwidth of signal is defined as the difference between the upper and lower frequencies of signal.
In a communication system, the message signal can be voice, music, picture or computer data. This has been shown in the table given as below: Bandwidth of Transmission Medium The commonly used transmission media are wire, free space, fibre optic cable MHz and optical fibre GHz.
This range is sub-divided further and allocated for various services as indicated in the table given as below: Antenna Antenna is a device which acts as an emitter of electromagnetic waves and it also acts as a first receiver of energy. It is generally a metallic object often a wire or collection of wires.
It is omni directional. Such antenna has a parabolic reflector with an active element. Propagation of Electromagnetic Waves In communication using radio waves, an antenna at the transmitter radiates the EM waves, which travel through the space and reach the receiver at the other end. These waves are guided along the earth surface and they follow the curvature of the earth. This mode of propagation is called sky wave propagation and is used by short wave broadcast services. The ionosphere is so called because of the presence of a large number of ions.
The details are in the table as below: The density of atmosphere decreases with height. The ionospheric layer acts as a reflector for a certain range of frequencies.
Space waves are used for Line-of-Sight LoS communication as well as satellite communication. Because of LoS nature of propagation, these waves are get Class 7 Maths Notes Byjus Ltd blocked at some point by curvature of earth as shown below: Satellite Communication In this communication, frequency Byjus Maths Class 8 Notes Readiness band 5. Modulation Modulation is the process of variation of some characteristics of a carrier wave in accordance with the instantaneous value of a modulating signal.
Need for Modulation It is due to the fact that low frequency signal 3. Types of modulations i Amplitude modulation ii Frequency modulation iii Phase modulation iv Pulse modulation 4. Amplitude Modulation In amplitude modulation, the amplitude of the carrier is varied in accordance with the information signal. Internet It is a network of computers, printers disk drives Byjus Class 9 Maths Notes You or other devices, connected in a network topology that allows the device to communicate.
Local Area Network In is a group of computers and associated devices that share a common communication line or wireless link. Typically, connected device share the resources of a single processor or server within a small geographic area.
Client Computer Every computer that extracts information from a server is called a client computer. Webpage A hypertext document connected to the world wide area is known as webpage.
It may contain text, videos, etc. Website A location connected to the internet that maintains one or more web pages. People use internet for many purposes like searching and viewing information on any topic of interest for sending electronic mails, for e-banking, e-shopping, e-booking, etc. Electronic mail Electronic mail is the exchange of computer-stored messages by telecommunication. Mobile telephony is the provision of telephone services to phones which may move around freely rather than stay fixed in one location.
Mobile phones connect to a terrestrial cellular network of base stations, whereas satellite phones connect to orbiting satellites. A cellular network or mobile network is a wireless network distributed over land areas called class, each served by at least one fixed location transceiver, known as a cell site or base station. All network related works including handling of all the incoming and outgoing calls are managed by a central control room called Mobile.
A telephone numbering plan is a type of numbering schemes used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Global positioning system is a space based satellite navigation system that provides location and time information in all weather conditions.
Twelve number of satellites is required for correct and accurate location indentification in the global positioning system. Class 12 Physics Notes. Topic 2 Modulation 1. RD Sharma Class 12 Solutions. Watch Youtube Videos.
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