History of communication up to 1933
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Transcript of History of communication up to 1933
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Group Members
• Abdul Rehman 12-EE-47• Ahsan Irshad 11-EE-
160• Irfan Farooq 12-EE-40• Muhammad Saaleh 12-EE-09• Muhammad Tehzeeb 12-EE-22• Muhammad Talha 12-EE-23
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Definition of Communication
• Exchange of information between two or more than two people in an understandable form is called communication.
• The person who sends the message is called Sender.
• The person who receives the information is called Receiver.
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History of Communications• Phoenicians alphabet.• Sumerians develop cuneiform writing -
pictographs of on clay tablets.• The Egyptians hieroglyphic writing
3500 BC to2900 BC
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History of Communications
• Greeks use a phonetic alphabet written from left to right.
• Oldest record of writing in China on bones.
1775 BC
1400 BC
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History of Communications• First postal service – for government use in China.
• First recorded use of homing pigeons to send messages - Announcing the winner of the Olympic Games to the Athenians.
900 BC
776 BC
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History of Communications
• Papyrus rolls and early parchments made of dried reeds – first portable and light writing surfaces.
• Tsai Lun of China invents paper as we know it.
500 BC to 170 BC
105 BC
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History of Communications• Human messengers on foot or horseback in Egypt and China with messenger.
• Fire and smoke messages.
200 to 100 BC
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History of Communications
• Romans establish postal services.
• Heliographs - mirrors first used to send messages by Roman Emperor Tiberius.
14 AD
37 AD
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History of Communications• Christiaan Huygens (Dutch scientist and
mathematician) work on the phenomena of light reflection and refraction.
• Main contribution: Invention of Pendulum, and Telescopic studies
1678
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History of Communications
• Claude Chappe (Freanch Inventor) first long-distance semaphore telegraph line using pendulums (Sound Clock). . Different positions, different signals.
• Charles Wheatstone reproduces sound by vibration (Musical Instruments-Piano)
Main Contribution: Wheatstone Bridge
1793
1821
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History of Communications
• Joseph Henry (American) invents the first electric telegraph. Electromagnet move- Selfinductance
• Micheal Faraday (English Physicist) publish his result on electromagnetism
• Samuel Morse invents Morse code. First long distance electric telegraph line. (Light, Voltage)
1831
1831
1835 to 1843
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History of Communications
• Alexander Graham Bell (Scottish Scientist, Engineer) invents the electric telephone.
Diaphram, which converts sound to electric pulses.
1876
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History of Communications• James Clerk Maxwell (1831-79): theory of
electromagnetic Fields, wave equations.
• Heinrich Rudolf Hertz (1857-94): Conclusively proved the existence of electromagnetic waves theorized by J Maxwell.
• Nikola Tesla Increased the distance of electromagnetic transmission.
1864
1886
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History of Communications• Thomas Edison patents the
mimeograph - an office copying machine.
• Alexander Graham Bell patents the electric telephone.
• Thomas Edison patents the phonograph.
1876
1877
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History of Communications
• Emile Berliner invents the gramophone - a system of recording which could be used over and over again.
1887
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History of Communications
• Guglielmo Marconi improves wireless telegraphy.
• First telephone answering machines appear.
1894
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History of Communications
• Guglielmo Marconi- demonstrates wireless telegraphy using long wave transmission with high transmission power (> 200kw)
1895
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History of Communications
• Valdemar Poulsen invents the first magnetic recording device using magnetized steel tape.
• Loudspeakers invented.
1899
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History of Communications• Amplitude Modulation was first
experimented by Reginald Fessen Ben and Roberto Landel
1900
History of Communications
• Marconi transmits radio signals from Cornwall to Newfoundland - the first radio signal to cross the Atlantic Ocean.
1901
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History of Communications• First Radio Broadcast by Reginald A. Fessenden• Invention of Amplifying Vacuum Tubes(triode)
by Lee De Forest and Robert Von Lieben
• Commercial transatlantic connections through huge base stations (30 hundred meter high antennas)
• First cross country call was made.
1906
1907
1914
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History of Communications
• Wireless voice transmission New York - San Francisco.
• First radios with tuners begin to broadcast different stations
1915
1916
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History of Communications• Discovery of short waves by Marconi which can
reflect from ionosphere and can be transmit around the world.
• Train-phone was available on the Hamburg – Berlin line. Wires parallel to the railroad track worked as antenna.
• TV broadcast trials (across Atlantic, color TV, TV news) John L Baird
• Frequency modulation (E. H. Armstrong)
1920
1926
1928
1933