Communication is the final product of electronics engineering. Communication can be broadly categorized into voice communication (telephony, radio, broadcasting, cellular mobile, etc.), video communication (text, pictures, moving objects, television broadcasting etc.) and data communication.
The sequence of development of communication system can be benchmarked as follows:
· Invention of electrical battery by Alessandro Vollta in 1799
· In 1837 Samuel Morse developed electric telegraph. “what hath God Wrought” DC Baltimore.
· In 1864 Existence of radio wavesm Maxwell
· In 1876 Graham Bell invented telephony.
· In 1887 Experimental proof of radio waves : Hertz
· In 1894 Wireless Communication (150 yards) : Oliver Lodge
· In 1897 Automatic telephone exchange was invented by Strowger.
· In 1901 Radio transmission over Atlantic (1700 miles), Marconi
· In 1906 First Radio Broadcast, R. Fessenden
· In 1906 Signal Amplification become possible after Invention of vacuum triode by Lee Deforest.
· In 1918 Super heterodyne Receiver, Armstrong
· In 1928 All electronic TV, P.T. Fransworth
· In 1933 Fm Armstrong
· In 1939 BBCTV
· In 1943 Matched filter, D.O.North
· In 1947 Walter Brattain, John Bardeen and William Schokley invented transistor
· In 1948 “ Mathematical theory of communication” –Shannon
· In 1958 Stored program call, Bell Lab
· In 1958 Integrated circuit concept was perceived by Jack Kilby and Robbert Noyce
· In 1958 Laser was also invented by Townes and Schawlow
· In 1962 T1 transmission, Bell Lab
· In 1971 ARPANET, Packet Switching
· In 1985 Internet was developed
Today, the communication system is in its highest stage of development with high speed data transmission through wide band optical fiber, uncountable numbers of Satellites in the orbit. ISDN switching network, massive deployment if cellular mobile communication systems, wireless telephony (WLL), emerging Global Mobile Personal Communication via Satellite (GMPCS) and so on.
he use of data communications systems are becoming increasingly prevalent these days because of the rapidly changing way in which we do work, communicate or entertain ourselves. We use computers for most purposes these days, but are never satisfied with the available technology. One of the fastest changing fields we have today is communications, and most of the developments in information technology are therefore directly concerned with this field.
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