20082563 hwangboram about the radio


Published on

  • Be the first to comment

  • Be the first to like this

No Downloads
Total views
On SlideShare
From Embeds
Number of Embeds
Embeds 0
No embeds

No notes for slide

20082563 hwangboram about the radio

  1. 1. │Introduction to communication │2012-10-0320082563 Hwang Bo ram
  2. 2. Invention of Radio The Radio ? The history and origin of radio is as interesting as the medium itself. The journey of the invention of radio started with the discovery of radio waves or the electromagnetic waves, which transmit music, pictures, speech and other data, via the medium of air. However, radio is also closely related with other technologies, like telegraphy and telephone, as the initial radio operated on the principle of ‘wireless telegraphy’.
  3. 3. Invention of Radio - Guglielmo Marconi “ Who is Marconi ?”
  4. 4. Guglielmo Marconi
  5. 5. Guglielmo Marconi <Titanic events have demonstrated the power of wireless telegraphy> 1912.Was a huge accident occurs. Luxury cruise ship Titanic hit an iceberg and sank.Due to accidents, 1,526 of the 2,239 people aboard who lost their lives at sea in the Arctic.The reason the rest of this structure was that Marconi invented wireless telegraphy. Titanic architect shortly before the ship sank through the wireless telegraphy was near the ship bumped SOS quickly on the scene to hear the signal arrived. At the time, the media said. "Marconis knowledge as a scientist and inventor as genius has saved lives of the survivors of the Titanic should be remembered."
  6. 6. Development of Radio During the 1890s, In addition to Marconi, Nikola Tesla and several others developed radio- conductors, transmitters, and receivers, making it possible to send Morse code messages across long distances without the physical limitations of wires, cables, or poles. This led to the terms wireless or radio-telegraphy. Telegrams sent across the wireless were radio-grams, or "radios" for short.
  7. 7. Development of Radio “ Radio can refer to either the electronic appliance that we listen with or the content listened to. However, it all started with the discovery of "radio waves" - electromagnetic waves that have the capacity to transmit music, speech, pictures and other data invisibly through the air. Many devices work by using electromagnetic waves including: ” radio, microwaves, cordless phones, remote controlled toys, television broadcasts, and more.
  8. 8. The FM Radio Following this, the most popular radio technology was discovered, the FM radio. The credit for inventing the frequency modulated radio goes to Edwin Howard Armstrong in 1933. The specialty of FM was that it improved the quality of audio signals drastically. The noise caused by electrical equipment and the earths atmosphere could now be easily controlled and reduced. In 1947, Bell Labs invented the transistor, while Sony, a Japanese company, introduced the transistor radio in 1954.
  9. 9. Various Radio <Korea’s First ‘FM Radio’> <GUM-SUNG Radio ‘RM-715’>
  10. 10. Current Radio Status NOW Since then, radio has not looked back and has become one of the popular mediums of portable ? entertainment. In the 21st century, technological developments have introduced concepts like internet radio, thereby broadening the horizon. Satellite radio is yet another latest development in the field, via which you can listen to numerous international radio channels anywhere.
  11. 11. Reference Site http://en.wikipedia.org/wiki/Guglielmo_ Marconi http://inventors.about.com/od/rstartinventions/a/r adio.htm http://blog.naver.com/ghcl2233