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PRINCIPLES OF COMMUNICATION

PRINCIPLES OF COMMUNICATION. GRADE XII OUR OWN HIGH SCHOOL, AL WARQA’A DUBAI.

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PRINCIPLES OF COMMUNICATION

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  1. PRINCIPLES OF COMMUNICATION GRADE XII OUR OWN HIGH SCHOOL, AL WARQA’A DUBAI

  2. COMMUNICATION- Transmission of information /message from one point to anotherCommunication enters our lives in many ways:- Telephone – makes us talk to any person anywhere.- Radio and television – entertain and educate.- Communication signals as navigational aids – ships, aircrafts and satellites .- Weather forecasting – conditions measured by a multitude of sensors are communicated to forecasters.- Videophones, voicemail and satellite conferencing – enable seeing live images instantly and communicate directly with people located far away.- Digital data transmission and retrieval – has made realization of e-mail, FAX and internet possible.We communicate through speech. In modern communication systems, the information is first converted into electrical signals and then sent electronically.

  3. COMMUNICATION SYSTEMTwo persons talking to each other constitute the simplest communication system. The person who speaks is the source, the person listening is the receiver and the intervening air is the communication link between them.A communication system consists of three basic components:-Transmitter (source)- Communication channel (link – medium)- ReceiverNature/details of these components depend on:1. Nature of the signal/ message to be communicated.2. Distance which separates the source and the receiver.- Direct talking is possible over short distances – sound waves attenuate fast.- Long distance communication requires the signal/message to be converted into an electrical signal/a set of signals /electromagnetic waves.- Long distance communication requires a link between the source and the receiver

  4. Message signal Communication channel Out put signal Transmitter Receiver NOISE CUMMUNICATION SYSTEM

  5. Transmitter:Transmitsthe message/signal over the communication channel. Quite often the original signal is not suitable for transmission over the communication channel to the receiver. It requires to be modified to a form suitable for transmission.Communication Channel:Provides a link between the transmitter and the receiver. It can be a transmission line (telephone and telegraphy), an optical fibre (optical communication) or free space in which the signal is radiated in the form of electromagnetic waves.Receiver:Reconstructs the original message/signal after propagation through the communication channel.

  6. TRANSMITTER- We communicate through a message or a signal.- A transmitter transmits the message over the communication channel to the receiver.- As a rule, the message produced by the source is not suitable for transmission over the communication channel. Accordingly, a suitable transducer converts it into a time varying electrical signal called themessage signal. Atransmitter, in its simplest form, is a setup which boosts the power of message signal and feeds it into the communication channel

  7. Antenna Antenna Loud speaker Amplifier Amplifier Microphone Receiver Transmitter

  8. HOME WORK Refer NCERT text book and write a brief note on communication system and draw the block diagram of generalised communication system.

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