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Headphones: small loudspeaker (earphone) held over the ear by a band or wire worn on the head. A presentation by:   S. Sik...
How they work: <ul><li>Made of three parts: </li></ul><ul><ul><ul><li>a voice coil  </li></ul></ul></ul><ul><ul><ul><li>a ...
Types: <ul><li>Sound canceling: </li></ul><ul><ul><li>They let out a sound wave that is opposite of the sound that is tryi...
Scientific Principles: <ul><li>Electrical currents run through the wires to be converted to sound waves in the headphone p...
Impact: <ul><li>Headphones were first used with radio work in 1919 </li></ul><ul><li>Contributed to invention of handheld ...
References: <ul><li>headphone . ( 2010). In  Encyclopædia Britannica.  Retrieved February  3,  2010, from Encyclopædia Bri...
References: <ul><li>Google Image Result for http://leahbess.com/html/hotz95_files/HEADPHONES.jpg. (n.d.).  Google Images ....
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Headphones

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Transcript of "Headphones"

  1. 1. Headphones: small loudspeaker (earphone) held over the ear by a band or wire worn on the head. A presentation by: S. Sikora
  2. 2. How they work: <ul><li>Made of three parts: </li></ul><ul><ul><ul><li>a voice coil </li></ul></ul></ul><ul><ul><ul><li>a permanent magnet </li></ul></ul></ul><ul><ul><ul><li>a cone-like diaphragm </li></ul></ul></ul><ul><li>The diaphragm is connected to the voice coil and this is what makes the sound by vibrations. </li></ul><ul><li>These come through the wires that change the electricity into sound waves </li></ul>
  3. 3. Types: <ul><li>Sound canceling: </li></ul><ul><ul><li>They let out a sound wave that is opposite of the sound that is trying to be canceled </li></ul></ul><ul><li>Open back: </li></ul><ul><ul><li>They have a hard back to not allow any sound to come through </li></ul></ul><ul><li>Closed back: </li></ul><ul><ul><li>They have holes in the back to allow the exterior noise to filter through </li></ul></ul>
  4. 4. Scientific Principles: <ul><li>Electrical currents run through the wires to be converted to sound waves in the headphone piece </li></ul><ul><li>Sound canceling – use the principles of opposite sound waves running against each other </li></ul>
  5. 5. Impact: <ul><li>Headphones were first used with radio work in 1919 </li></ul><ul><li>Contributed to invention of handheld telephones </li></ul><ul><li>Serve many purposes: </li></ul><ul><ul><li>Airplane pilots </li></ul></ul><ul><ul><li>Telephones </li></ul></ul><ul><ul><li>Recreational uses: iPod’s and MP3’s </li></ul></ul>
  6. 6. References: <ul><li>headphone . ( 2010). In Encyclopædia Britannica. Retrieved February  3,  2010, from Encyclopædia Britannica Online: http://search.eb.com/eb/article-9039697 </li></ul><ul><li>Harris, W. (n.d.). HowStuffWorks &quot;Noise-canceling Headphones: Electrostatic and Dynamic&quot;. Howstuffworks &quot;Electronics&quot; . Retrieved February 3, 2010, from http://electronics.howstuffworks.com/gadgets/audio-music/noise-canceling-headphone1.htm </li></ul><ul><li>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 </li></ul>
  7. 7. References: <ul><li>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 </li></ul><ul><li>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 </li></ul>
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