Headphones
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  • 1. Headphones: small loudspeaker (earphone) held over the ear by a band or wire worn on the head. A presentation by: S. Sikora
  • 2. How they work:
    • Made of three parts:
        • a voice coil
        • a permanent magnet
        • a cone-like diaphragm
    • The diaphragm is connected to the voice coil and this is what makes the sound by vibrations.
    • These come through the wires that change the electricity into sound waves
  • 3. Types:
    • Sound canceling:
      • They let out a sound wave that is opposite of the sound that is trying to be canceled
    • Open back:
      • They have a hard back to not allow any sound to come through
    • Closed back:
      • They have holes in the back to allow the exterior noise to filter through
  • 4. Scientific Principles:
    • Electrical currents run through the wires to be converted to sound waves in the headphone piece
    • Sound canceling – use the principles of opposite sound waves running against each other
  • 5. Impact:
    • Headphones were first used with radio work in 1919
    • Contributed to invention of handheld telephones
    • Serve many purposes:
      • Airplane pilots
      • Telephones
      • Recreational uses: iPod’s and MP3’s
  • 6. References:
    • headphone . ( 2010). In Encyclopædia Britannica. Retrieved February  3,  2010, from Encyclopædia Britannica Online: http://search.eb.com/eb/article-9039697
    • Harris, W. (n.d.). HowStuffWorks "Noise-canceling Headphones: Electrostatic and Dynamic". Howstuffworks "Electronics" . Retrieved February 3, 2010, from http://electronics.howstuffworks.com/gadgets/audio-music/noise-canceling-headphone1.htm
    • Lebeau, R. (n.d.). How noise canceling headphones work - by Raven Lebeau - Helium. Helium - Where Knowledge Rules . Retrieved February 7, 2010, from http://www.helium.com/items/615460-how-noise-canceling-headphones-work
  • 7. References:
    • Google Image Result for http://leahbess.com/html/hotz95_files/HEADPHONES.jpg. (n.d.). Google Images . Retrieved February 7, 2010, from http://images.google.com/imgres?imgurl=http://leahbess.com/html/hotz95_files/HEADPHONES.jpg&imgrefurl
    • The History of Headphones. (n.d.). EzineArticles Submission - Submit Your Best Quality Original Articles For Massive Exposure, Ezine Publishers Get 25 Free Article Reprints . Retrieved February 7, 2010, from http://ezinearticles.com/?The-History-of-Headphones&id=3246508