Module5 l9 basic communication system
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A communication system consists of an information source that generates messages, a transducer to convert the information to an electrical signal, a transmitter to process and transmit the signal, a channel to carry the signal between transmitter and receiver, and a receiver to reproduce the original signal. Mobile phones use radio waves transmitted through antennas to communicate with each other over mobile networks.
Module5 l9 basic communication system
- 3. 3 Communication System Communication : Transfer of useful information between two points. They are basically classified as 1) Wired communication : Media or channel is through wire 2) Wireless Communication : Media is Air
- 4. 4 Communication System Information source: Messages are in the form of words, picture sound signal, video etc. Transducer: Information signals are not electrical in nature , a device which converts one form of signal to another form is called transducer. Here transducer used to Convert signal to electrical form for transmission Transmitter: The main function of transmitter is to process the electric signal like Modulation, amplification and filtering to make it capable to transmit signal over long distance.
- 5. 5 Communication System Channel: This medium is either wired (twisted pair, co-axial, Optical Fiber Cable (OFC), etc.) or wireless (free space, radio communication, etc.), through which the message travel from the transmitter to receiver. Noise: It is an unwanted signal which distort the message signal. They can interface with signal at any point in a communication and are unpredictable in nature. Receiver: The main function of receiver is to reproduce the massage signal in electrical form. It performs the functions like de- modulation, filtering, amplification, etc. Ex: loud- speaker
- 6. 6 Communication System Principles of Operation of mobile phone Mobile phones use radio waves to communicate Radio Waves are Electromagnetic Waves ,where data is in oscillating electric and magnetic field form Mobile phones transmit radio waves in all direction by built in radio antenna An antenna converts an electric signal to the radio wave (transmitter) and vice versa (receiver). Modern smart phones also contain more than one type of antenna. In addition to the cellular antenna, they may also have Wi-Fi, Bluetooth and/or GPS antennas.