Basic Communication Concepts

** Communication: Communication means transfer data/info from one place to another place.

** Data: Data is raw material for data processing. Data relates to fact, event and transactions. Data refers to unprocessed information.

**Information: Information is data that has been processed in such a way as to be meaningful to the person who receives it. It is anything that is communicated.

** Range of human Visible light 400nm to 700nm

** Human Voice frequency range- 20Hz to 20000Hz/20KHz

** Microphone: Microphone converts Mechanical signal to Electrical signal.

** Speaker: Speaker converts Electrical signal to Mechanical signal.

** Radio frequency has two parts—1) VHF(Very  High Frequency);  2) UVA(Ultra Violet Frequency).

** Telephone/Internet cable name is STP(Shielded Twisted Pair) cable.

** Full form of DISH is Diffuse Idiopathic Skeletal Hyperostosis Syndrome.

** Dish cable name Coaxial Cable or Coax.

** Transducer: A transducer is a device that converts one type of energy to another. This conversion can be to/from electrical, electro-mechanical, electromagnetic, photonic, photovoltaic or any other form of energy.                        Or

    Converts Mechanical signal to Electrical signal. Or Convert Electrical signal to Mechanical signal.

** Modulator: Modulation is the process of conveying a message, for example: a digital bit stream or an analog audio signal, inside another signal that can be physically transmitted.

Or, It carries the modulating/message signal to the receiver by carrier signal. Means it mixing up the low frequency and high frequency.

##Or, Modulation is a process of conveying message or modulating signal to the receiver by the help of carrier signal. It basically mixing up the low frequency and high frequency.

**Encoder: Encoder is used for security purpose. It can be encoded by password/zipped etc.

**Amplifier: Amplifier is a device for increasing the power of a signal by using external energy. That means it amplify the signal coming from source.

##Or, Amplifier is a device which is used to increase the amplitude of signal or signal strength by using external energy.

** Communication channel: Channel in communications refers to the used to convey information from sender to a receiver.

**Noise: Noise is unwanted and unavoidable but sometime controllable signal. Any unwanted form of energy which tends to interfere with proper reception and reproduction of unwanted signal.

** Repeater: Repeater regenerates incoming electrical wireless or optical signals.

** Antenna: The amplified and modulated signal to be spread by an antenna.

**Demodulator: Gives up the carrier signal from the message/modulating signal.

**Decoder: Decode the data/info/signal achieved.

**Filter: Leave/give up the unwanted things.