WORLD OF TECHNOLOGY

Different Types of communication systems

The main communication systems we are using now 1)voice(300-3.5khz) 2)audio(20hz-20khz) 3)video(0-4.5Mhz) 4)Data communications(Eg:broadband) Block diagram of communication system Transmitter is the first block in the block diagram of communication system. Here the message which is to be sent is generated.In Encoders process in which the actual message is converted in to symbols for transmission. In this a sequence of characters are put in a specialized format for efficient transmission.Noisy channel is nothing but the medium through which the message is transmitted.Decoder is used to decode the encoded message and retrieve the actual message.Receiver can be said as the target to which the information need to be delivered. Need for modulation in communication systems 1)To reduce the antenna height 2)Multiplexing of signals In analog communications we use (Frequency Division Multiplexing) In digital communications we use (Time Division Multiplexing) 3)To reduce the effec...

This blog is for Electronics and Communication Engineering students and graduate engineers who are preparing for public examinations.This blog covers all the core subjects in electronics and communication.This blog mainly targeted the concept behind each technology in electronics .By knowing the concepts electronics is very interesting.It plays major role in the development of technology.There are millions of technologies developed using electronics circuits and concepts .Our mobile phones digital cameras,sensors,robots ......... etc are the examples. Communication System Engineering teaches about systems, satellites, television, telephone, radar, and navigation etc. Today we can communicate instantly with a person sitting thousands of miles far just with the push of few buttons of telephone; we can get instant weather information of whole universe from satellites, we can spot an enemy entering in our territory through air route with the help of a radar, we can watch proceedings i...