Fun With Sound And Cameras

Alcove Audio

Alcove Audio

This is cool.

https://www.youtube.com/watch?v=mODqQvlrgIQ​

From the YouTube page:

This is really simple but has such an awesome effect. Fill a bucket full of water and place it about 5 feet off the ground. Place a subwoofer about 1 foot lower than the bucket. Run a plastic tube from the top bucket down in front of the subwoofer. Tape the tube to the front of the speaker. Then aim the end of the tube to an empty bucket on the floor. Get the water flowing from the top bucket. Now just generate a 24 hz sine wave and set your camera to 24 fps and watch the magic happen. Basically your cameras frame rate is synced up with the rate of the vibrations of the water so it appears to be frozen or still. Now if you play a 23 hz sine wave your frame rate will be off just a little compared to the sine wave causing the water to "move backward" or so as it appears. You can play a 25 hz sine wave and cause the water to move slowly foward.

Really fun experiment. You should definitely give it a try.

Thanks to JacobTMcgarry for giving me the OK to create my own version based on his original video:

http://www.youtube.com/watch?v=8GkHePfcpbY&context=C40ee253ADvjVQa1PpcFPc...
 
That is waaaay cool!
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That's really sweet.

It reminds me of a similar experiment I saw on youtube ages ago. They basically put a board over a subwoofer and pour rice all over it. It's really amazing because the different frequencies form really interesting geometrical patterns (iirc the higher frequencies caused the shapes to multiply and get smaller, hexagons became octagons etc). Some of them were almost reminiscent of crop circles. lol

I haven't been able to find it since then, unfortunately.

Thanks for sharing, uncle bob!
 
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