COMMUNICATION SYSTEMS
Barriers to Human Communication
X Language
X Distance
Electronic Communications
The transmission, reception, and processing of information using electronic circuits.
History
mid-19th century ¡V James Clark Maxwell studied electromagnetic wave and predicted that it can be propagated through free space.
1837 ¡V Samuel Morse invented the telegraph.
1876 ¡V Alexander Graham Bell and Thomas A. Watson transmitted human conversation over a functional telephone system.
1888 ¡V Heinrich Hertz radiated electromagnetic energy from a machine he called oscillator.
1894 ¡V Guglielmo Marconi was the first to accomplish wireless transmission.
1908 ¡V Lee DeForest invented the triode vacuum tube.
1933 ¡V Major Howard Armstrong invented frequency modulation.
1948 ¡V William Shockley, Walter Brattain and John Bardeen invented the transistor.
Electromagnetic Spectrum
Electromagnetic Spectrum
The entire range of frequency.
Frequency......
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