Communication systems (part-2)

What is are the basic terms used in communication system? Difference between analog signal and digital signal? What is noise? What is attenuation? What is amplification? What is the range of a signal? What is Band width? What is modulation? What is demodulation? What is Repeater? Explain the general feature of earth’s magnetic field? What is the importance of the chapter Communication systems? Why do we study the chapter Communication systems?

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Information converted in electrical form and suitable for transmission is called signal. Analog signal is a continuous function of time. Digital signal is discrete value of time. Noise refers to unwanted signals that tend to disturb the transmission and processing of the signal. The loss of strength of a signal while propagating through a medium is known as Attenuation. Process of increasing the amplitude of the signal using electrical circuit called amplifier. Range is the largest distance between the source and destination up to which the signal is received with sufficient strength. The range of frequencies of a signal is called a bandwidth. The process of super imposing the audio signal on high frequency radio wave is called modulation. A repeater is combination of receiver and transmitter. It picks up the signal, amplifies it and retransmits to the receiver.