Broadcasting System
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In nowadays communication becomes our daily lives in different ways that it is very easy to overlook the multitude of its facets. Cell phones at our hands, television and radios in our sitting rooms, computer terminals with access to the Internet in our offices and homes, and the newspapers are capable of delivering a rapid communications around the world. Communication provides the senses for ships on the high seas, aircraft in the flight and the rockets and satellites in space. Communication through a wireless phone keeps a car driver in touch with the office or home miles away. Communication keeps a weather forecaster informed of conditions measured by a multitude of sensors. Communication involves implicitly the transmission of information from point to point through a succession of process.
• Generation of a message signal computer data, pictures, sense, voice, music. • Description of that message signal with a certain measure of precision by a set of symbols. •Encoding symbols in a form that is suitable for transmission over a physical medium of interest. •Transmission of the encoded symbols to the desired destination. •Decoding and reproduction of the original symbols. •The re-creation of the original message signal with a definable degradation in quality, the degradation is caused by imperfections in the system.
There are many types of communications that do not directly involve the human mind in real life. There are computer communications involving communication between two or more computers, human decisions may follow in setting up the programs or commands for the computer, or in monitoring the results.
There are three types of basic elements to every communications system that is the transmitter, channel and receiver. Transmitter is located at one point in space, the receiver is located at some other point separate from the transmitter, and the channel is the physical medium that connects them. The purpose of the transmitter is to convert the message signal produced by the source of information into a form suitable for transmission over the channel, as the transmitted signal propagates along the channel; it is distorted due to channel imperfections. Noise and interfacing signals are added to the channel output, with the result that the received signal is a corrupted version of the transmitted signal. The receiver has the task of operating on the received signal so as to reconstruct a recognizable form of the original message signal for a user.
Broadcasting which involves the use of a single powerful transmitter and numerous receivers that are relatively inexpensive to build. Here information bearing signals flow only in one direction.
Point to point communication in which the communication process takes place over a link between a single transmitter and a receiver. In this case there is usually a bidirectional flow of information bearing signals, which requires the use of a transmitter and receiver at each end of the link.
Broadcasting mode of communication is exemplified by radio and television and the ubiquitous telephone provides the means for one form of point to point communication. There is another point to point communication is the link between an Earth station and a robot navigating the surface of a distant planet.
About the Author
About the Author: Zola Mathe is the owner of broadcasting company. You will find right information on http://www.allwiseinformation.com/Technology_Information_online.html
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