Video of guitar strings from inside guitar

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Discussion Overview

The discussion revolves around a video showing the motion of guitar strings from inside a guitar, specifically examining the visual effects captured by a cell phone camera. Participants explore the implications of the video in terms of physics and the perception of motion, considering factors like frame rate and camera effects.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant expresses skepticism about the video's authenticity, suggesting a mismatch in the time scale of thumb movement and wave impulses on the string, initially considering it might be fake.
  • Another participant counters that the video is not fake, attributing the observed effects to how the camera captures images, specifically mentioning it as a camera effect unrelated to the physics of the string.
  • A participant recalls searching for high-speed camera videos of guitar strings and notes that the discussed video does not qualify as such.
  • There is a request for a better video example, indicating that the current video does not meet the criteria for high-speed capture.
  • One participant mentions using a video from Trevor Cox at Salford University as a preferred alternative for educational purposes.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the nature of the video, with some asserting it is a camera effect while others initially question its authenticity. The discussion reflects differing views on the interpretation of the visual phenomena presented in the video.

Contextual Notes

There is an acknowledgment of the limitations in understanding the video's implications due to the nature of the camera's frame rate and the potential for stroboscopic effects, which remain unresolved in the discussion.

bcrowell
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Several of my students have pointed me to this video: http://bit.ly/1N1IGR8 Apparently the guy put his cell phone inside his guitar and took a video. My initial reaction was that it looked fake, because the time scale of the movement of his thumb seemed mismatched to the time scale of the motion of the wave impulses on the string, but now I'm thinking that this may just be a stroboscopic effect. Would anyone care to put together a more detailed interpretation of what's going on? I wonder what the frame rate of cell phone video is. Some of the comments on the video may be relevant.
 
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It is not fake, but indeed an effect of how the camera captures the image. I came across this a year ago or so when I was looking for high speed camera videos of guitarr strings to show my students. Needless to say, I did not select this one as it is a camera effect and not related to the physics of the string. It would be easy to fool someone who did not know this though.
 
Orodruin said:
I came across this a year ago or so when I was looking for high speed camera videos of guitarr strings to show my students.

Did you find one you liked better?
 
bcrowell said:
Did you find one you liked better?
Well, that one does not count as finding since it is definitely not a high speed camera, but yes. I will see if I can dig it out.
 
It seems I used a video from Trevor Cox at Salford University. The first few seconds of this clip is the closest I can find at the moment.
 
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