Communication refers to the transfer of information between entities. Communication is a sign-mediated interaction between two elements that share a set of semiotic rules and signs. Communication can also be described as the "transmission or exchange of thoughts, opinions or information through speech, writing or signs". There are many methods of communicating, with the most popular being direct speech between people. Communication can also be made possible by other facilities, such as communications equipment. The most common types of communication equipment used in modern times are telephone, radio, television, and the computer via internet.
Telephone
An analogue telephone network connects the caller to the person he wishes to talk to by using switches located at various telephone exchanges. The switches create an electrical connection between users. This is done electronically by the caller dialing the number. Once the connection has been established, the caller's voice will be converted into an electrical signal by a microphone on the handset. The electrical signal is processed and sent over the network to the other user. Once there, it is converted back into sound using a small speaker on the handset. A separate electrical connection allows for both parties to converse by working in the reverse. Long distance calls can also be made via the fixed line which combines analogue and digital transmission. With the advent of the cell phone, fixed lines are becoming less popular. This allows users to be fully mobile
Modern Means Of Communication.
Radio And Television
A broadcast system's central broadcast tower transmits high-frequency electromagnetic waves to several low-powered receivers. The tower modulates the high-frequency electromagnetic wave with audio or visual information. After the tower sends the high-frequency signal, the receiver is tuned to allow it to be picked up by the instrument. A demodulator is then used to retrieve the audio or visual information. Analogue signals can either be varied in frequency with the information, or digital broadcast signals that are encoded as a series of discrete values. The outcome of the broadcast signal will depend on the method used. If you listen to radio, it will be audio. Television viewers will see audio and pictures.
Internet
In reality, the Internet is a global network of computers and networks that can communicate using the Internet Protocol. Each computer connected to the Internet has its own unique IP address. This address can be used to send information to other computers. Any computer can send a message to another computer via its IP address. The IP address of the sending computer is included in these messages, allowing for two-way communication.