Introduction to Communication Systems - Physics Animation
The present era is the era of ‘information and communication
revolution’. In electronics, the term ‘communication’ refers to sending,
receiving and processing of information electronically. In 1840’s,
communication started with telegraphy. Few decades later, telephony
was developed followed by radio at the beginning of twentieth century.
Radio communication was made possible by the invention of the
electronic valves. It subsequently became even more widely used and
refined through the invention and use of the transistors, integrated
circuits and other semiconductor devices.
More recently, the use of satellites and fiber optics has made
communications even more widespread, with an increasing emphasis
on computer and other data communications. Radar, telemetry and
satellite links play vital role in navigation, defence, scientific research
etc. For communication purposes, only a part of the electromagnetic
waves like radio waves and microwaves are being used.
