timmo Posted January 21, 2015 Share Posted January 21, 2015 I thought it was an interesting clip.Although it is a guitar, i imagine the principle is the same. It shows what happens with the strings when plucked. http://digg.com/video/what-guitar-strings-are-doing-up-close Quote Link to comment Share on other sites More sharing options...
cybertect Posted January 21, 2015 Share Posted January 21, 2015 (edited) I don't believe that represents what they're actually doing. There are far too many nodes (waves). A string vibrates across its entire length from nodes both ends (bridge and nut) unless you're playing a harmonic, when there are more nodes, but only 2 3, or 4 in most cases. I think the smaller waves are an artefact created by the shutter and/or scanning of the CCD sensor on the camera, similar to the Lartigue Effect [url="http://maisonbisson.com/post/10531/focal-plane-shutter-distortion/"]http://maisonbisson....ter-distortion/[/url] Edit and what's happening to the propeller of a plane in this video [url="https://www.youtube.com/watch?v=ecV7oo68vAc"]https://www.youtube....h?v=ecV7oo68vAc[/url] Edited January 21, 2015 by cybertect Quote Link to comment Share on other sites More sharing options...
timmo Posted January 21, 2015 Author Share Posted January 21, 2015 Ok, Thanks. That is also an interesting read Quote Link to comment Share on other sites More sharing options...
DaveFry Posted January 21, 2015 Share Posted January 21, 2015 Try this at home ! [media]http://www.youtube.com/watch?v=INqfM1kdfUc[/media] Quote Link to comment Share on other sites More sharing options...
ead Posted January 21, 2015 Share Posted January 21, 2015 I'm not sure that's the case as it would mean that you only ever heard the fundamental when you pluck a string. Just stick a spectrum analyser on the pickup output and you'll see all sorts going on. Quote Link to comment Share on other sites More sharing options...
cybertect Posted January 21, 2015 Share Posted January 21, 2015 [quote name='ead' timestamp='1421846073' post='2665647'] I'm not sure that's the case as it would mean that you only ever heard the fundamental when you pluck a string. Just stick a spectrum analyser on the pickup output and you'll see all sorts going on. [/quote] There will be harmonics, but you're certainly not going to get those sharp, triangular peaks illustrated in the video posted by DaveFry, for example. The effect we're seeing is entirely down to the interaction of the string movement and the (relatively slow) rolling shutter of the camera. If you use a high speed camera to capture string movement in slow motion, at 600 and 1200 frames per second (20 and 40 times slower than real time) it looks like this [media]http://youtu.be/6sgI7S_G-XI[/media] Quote Link to comment Share on other sites More sharing options...
gelfin Posted January 21, 2015 Share Posted January 21, 2015 (edited) It's just the cameras frame rate. You get the same effect when filming an airplane propellor. The blades look bent/curved and sometimes appear detached. [url="https://www.youtube.com/watch?v=c4bqhcVl2M8"]https://www.youtube....h?v=c4bqhcVl2M8[/url] https://www.youtube.com/watch?v=78F18jGp98I Edited January 21, 2015 by gelfin Quote Link to comment Share on other sites More sharing options...
KevB Posted January 22, 2015 Share Posted January 22, 2015 Or you can try it in real time for some whacky 'hall of mirrors' effects; [url="https://www.youtube.com/watch?v=Fg9Ph53ka2I"]https://www.youtube.com/watch?v=Fg9Ph53ka2I[/url] Quote Link to comment Share on other sites More sharing options...
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