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  • Jiayi Lu 5:33 pm on December 13, 2014 Permalink |  

    How a headphone works. 

    As a audiophile, i have been really interested in how my headphone works. Until recently, i found a video briefly but clearly explained the mechanism behind a headphone. Basically, there are three most important parts. The first one is called diaphragm, which is more commonly known as a column. It is made to pull the air back and forth to create sound. The second and third part are a simple magnet plus a voice coil. When the electricity goes through cable to our magnet, the magnet a electromagnetic field. This field pull the voice coil back and forth, which is attached to the diaphragm, therefore creating sound.

     
    • Rachel Denise Cotton 1:44 pm on December 14, 2014 Permalink

      Hey! I really like the video that you found. With talking about this in class, it can be very confusing but this video gave a better understanding for me. I really enjoyed it. A headphone is so small and intricate and I think we all don’t take into consideration how much effort it takes to produce a small headphone. Now, if only I can find a way to fix my headphones myself without breaking it even more!

  • Jiayi Lu 10:29 pm on November 13, 2014 Permalink |
    Tags: https://www.youtube.com/watch?v=HMXoHKwWmU8   

    How our ear work 

    This video posted on Youtube is basically about how our ears work and what those specific ear components are. In this video, i figure out ear drum is not the only ear component for us to hear various sounds, three pieces of bones also play a important role here. After sound goes through ear drum then it vibrate bones, and finally goes to our brain where make this sound understandable for human beings. It’s so interesting that i can see that what exactly in our ear makes us hear everything.

     
  • Jiayi Lu 2:50 am on October 25, 2014 Permalink |  

    Super Cool Instrument for Horror Movies 

    This instrument is made for horror movies’ BGM. It is made up of several metal bars and a metal plate. With various lengths, every single metal bar will vibrate with different frequency therefore producing different sound. When the artist in the video uses a metal stick to touch every metal bar, their combination of vibration produces a unique sound. And the large metal plate at the bottom of the instrument also vibrates so that it makes a heavy and horrible feeling. https://www.youtube.com/watch?v=9d1yDCWicf0

     
    • Katerina Mary Procyk 11:27 am on October 28, 2014 Permalink

      That’s really neat. I always figured that horror movies used some kind of synthesizer or computer to make their sound effects. From watching the video, it looks incredibly simple to play and make. I imagine it’s a rather instrument as well.

  • Jiayi Lu 11:50 pm on October 3, 2014 Permalink |  

    Shock Waves in Supersonic Velocity 

    https://www.youtube.com/watch?v=WbvPGakeBaU

    I am really interested in why airplanes flying over our head, but after we wait for few seconds, then we can hear the sound of their engines. So i searched something about “Shock waves” on Youtube to figure out the mechanism of shock waves. Then i found an animation really specifically explaining how shock waves work in supersonic velocity. In the video we can see the shock waves are created at the end of the airplane, but not around it. Therefore, when it flies over our head, the sound won’t immediately transit into our ear. However, after it passes, the shock waves finally will follow up and eventually be heard.

     
  • Jiayi Lu 11:30 pm on September 10, 2014 Permalink |  

    Frequency, can you feel it? 

    https://www.youtube.com/watch?v=qNf9nzvnd1k
    In class, we were told the formula of frequency and we know that length and quality affected the frequency. The formula is so abstract that we cannot know the exactly feeling of the frequency. In the video above, it shows the frequency vividly. From the start, the frequency is very slow and we can barely hear that. As the frequency becoming more and more strenuously, we can hear the sound becoming louder and sharper, until we are not able to hear the frequency. The art of sound is miraculous and i’m willing to learn more during the class. 🙂

     
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