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A television is a reciever just like a radio.
Radio recieves audio signal where as television recieves both audio as well as video.
1. Demodulator: The basic requirement of a reciever is a demodulator. In the transmission side, the audio/video signals are placed on a carrier signal to make it travel long distance. For example, we take train/ bus to travel long distance since we do not have enough energy to travel by walk. Similarly the signlas are too weak to travel long distance. So we do a modulation to transmit it long distance. A demodulator seperates the audio/video signal from carrier signal.
2. Amplifies: The signals cannot be used as such to drive the speakers or picture tube. So they need to be power amplified to drive the television. There are Seperate amplifiers for audio and video.
3. Speakers: To reproduce the sound we need the speaker. The demodulated audio signal is power amplified and fed to the speakers. Modern day television has much more Signal processors to improve the audio quality.
4.Picture Tube: Picture tube is also known as cathode ray tube. This has a phosporus coated display which produces illumination when electrons impact on them. The picture is reproduced by controlling the electron gun(which produces ray of electrons).
5. And finally power supply unit.
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