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What The Strings Of An Upright Bass Looks Like

Hits: 7641 | Rating: (2.4) | Category: Science | Added by: fancylad
Jump to: Bottom    Last Post
MacGuffin
Female, 30-39, Europe
 2597 Posts
Friday, August 03, 2012 11:29:31 AM



Need some more sticky tape, guys?

oldallen671
Male, 30-39, Western US
 23 Posts
Friday, August 03, 2012 5:05:52 AM
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OldOllie
Male, 60-69, Midwest US
 13831 Posts
Thursday, August 02, 2012 10:18:46 PM
A video is just series of still images at ~24 frames per second. If the exposure time for each image is short enough, it can freeze a moving object without blurring it. When the frame rate is near an even factor of the frequency of the vibrating string, it can appear to slow down or even stop. It's the same phenomenon seen in old western movies when the stage coach wheels appear to be turning backwards.

PTPete
Female, 30-39, Western US
 1244 Posts
Thursday, August 02, 2012 8:54:48 PM
Nice

kemic
Male, 18-29, Europe
 164 Posts
Thursday, August 02, 2012 6:52:32 PM
its called hertz

uatme
Male, 18-29, Canada
 1013 Posts
Thursday, August 02, 2012 5:38:53 PM

Aliasing Sines

DFWBrysco
Male, 40-49, Eastern US
 307 Posts
Thursday, August 02, 2012 2:30:47 PM
8Bit and Whodat are both correct - this is a matter of the camera as well as an optical illusion.

The stringed instrument family of violin, viola, bass and cello are strung at approximately 1600 lbs of pressure per square inch, resonating at 200hz to 3.5khz for violin, 125hz to 1.5khz for viola, 63hz to 630hz for cello and 40hz to 200hz for bass.

At these frequencies, it is impossible to follow the actual movement of the string without a Phantom camera, for the most part, but still - awesome video.

And yes - I was a music nerd playing these instruments for 35 years...

whodat6484
Male, 30-39, Eastern US
 3642 Posts
Thursday, August 02, 2012 11:44:43 AM
Pretty much all stringed instruments do that, you just can't see it with the naked eye because it's vibrating so fast. This reminds me of the video for Pantera's "5 Minutes Alone"

Mikeoxsbiggg
Male, 30-39, Canada
 1188 Posts
Thursday, August 02, 2012 10:13:07 AM
8BitHero is right. They vibrate really fast so it's just an optical illusion. You normally don't see it because you have to get close and have a lighter more distant background. Any stringed instrument will do this. A violin you might not see wobbles as much vs an upright bass.

edana42
Female, 50-59, Eastern US
 2505 Posts
Thursday, August 02, 2012 9:38:26 AM
Ooops.. thought you meant this:


Ilikelogic
Male, 40-49, Europe
 522 Posts
Thursday, August 02, 2012 9:29:40 AM
Don't know enough about wavelengths on string instruments, but i would think it's a question of the scanning rate of the camera creating this illusion, so i go with 8BitHero

5Cats
Male, 50-59, Canada
 24796 Posts
Thursday, August 02, 2012 9:10:16 AM
I had NO IDEA they did that! I thought there was just one big wobble from top to bottom, not a bunch of little wobbles along the way...

8BitHero
Male, 18-29, Europe
 5426 Posts
Thursday, August 02, 2012 8:31:35 AM
And then I-A-B shines...

It doesn't actually wobble, it's more of an optical illusion

fancylad
Male, 30-39, Western US
 2520 Posts
Thursday, August 02, 2012 7:22:26 AM
Link: What The Strings Of An Upright Bass Looks Like [Rate Link] - Whoa, wobbly!


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