WahKeen Posted April 20, 2012 Share Posted April 20, 2012 Super cool. The video was posted by YouTube user brusspup, who has been featured here on The Feed a few times for amazing optical illusions and art, and who writes about it: 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. Link to comment Share on other sites More sharing options...
pfox14 Posted April 20, 2012 Share Posted April 20, 2012 That is so cool Link to comment Share on other sites More sharing options...
Big Bill Posted April 20, 2012 Share Posted April 20, 2012 To simplify: The sine wave or sinusoid is a mathematical function that describes a smooth repetitive oscillation. It occurs often in pure and applied mathematics, as well as physics, engineering, signal processing and many other fields. Its most basic form as a function of time (t) is: where: A, the amplitude, is the peak deviation of the function from its center position. ω, the angular frequency, specifies how many oscillations occur in a unit time interval, in radians per second φ, the phase, specifies where in its cycle the oscillation begins at t = 0.When the phase is non-zero, the entire waveform appears to be shifted in time by the amount φ/ω seconds. A negative value represents a delay, and a positive value represents an advance. Sine wave 5 seconds of a 220 Hz sine wave Problems listening to this file? See media help. The oscillation of an undamped spring-mass system around the equilibrium is a sine wave. The sine wave is important in physics because it retains its waveshape when added to another sine wave of the same frequency and arbitrary phase and magnitude. It is the only periodic waveform that has this property. This property leads to its importance in Fourier analysis and makes it acoustically unique. Link to comment Share on other sites More sharing options...
WahKeen Posted April 20, 2012 Author Share Posted April 20, 2012 Bill, do you think we're that dumb? You won't make any friends if you spell it out like that to show the obvious... Maaaan! :unsure: Link to comment Share on other sites More sharing options...
Elmer Posted April 20, 2012 Share Posted April 20, 2012 Bill, do you think we're that dumb? You won't make any friends if you spell it out like that to show the obvious... Maaaan! :unsure: HAHA. sure, very obvious. Link to comment Share on other sites More sharing options...
cabba2203 Posted April 20, 2012 Share Posted April 20, 2012 Very cool! They should design a urinal that could send the sound wave out, totally screw with the minds of drunk people at the pub. Link to comment Share on other sites More sharing options...
Flight959 Posted April 20, 2012 Share Posted April 20, 2012 [thumbup] [thumbup] A cool thread!!! Thanks for posting!! Regards Link to comment Share on other sites More sharing options...
badbluesplayer Posted April 21, 2012 Share Posted April 21, 2012 Cool! Link to comment Share on other sites More sharing options...
pfox14 Posted April 21, 2012 Share Posted April 21, 2012 To simplify: The sine wave or sinusoid is a mathematical function that describes a smooth repetitive oscillation. It occurs often in pure and applied mathematics, as well as physics, engineering, signal processing and many other fields. Its most basic form as a function of time (t) is: where: A, the amplitude, is the peak deviation of the function from its center position. ω, the angular frequency, specifies how many oscillations occur in a unit time interval, in radians per second φ, the phase, specifies where in its cycle the oscillation begins at t = 0.When the phase is non-zero, the entire waveform appears to be shifted in time by the amount φ/ω seconds. A negative value represents a delay, and a positive value represents an advance. Sine wave 5 seconds of a 220 Hz sine wave Problems listening to this file? See media help. The oscillation of an undamped spring-mass system around the equilibrium is a sine wave. The sine wave is important in physics because it retains its waveshape when added to another sine wave of the same frequency and arbitrary phase and magnitude. It is the only periodic waveform that has this property. This property leads to its importance in Fourier analysis and makes it acoustically unique. What was the middle part again? Link to comment Share on other sites More sharing options...
newwt Posted April 21, 2012 Share Posted April 21, 2012 WOW, Now thats something....I ain't never seen before. Link to comment Share on other sites More sharing options...
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