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61 hertz sine wave tone at 60 fps
Weird Speaker Effect
Posted 11 years ago by boyt in category: interesting
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(guest) - 11 years ago [ Reply ]
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The effect is not a speaker's but a camera's: a video camera does not take a picture "at once" but line by line. With the small difference between fps and loudspeaker frequency this looks as if the speaker is wobbling. A similar effect is the seemingly backwards-rotating wheels or propellers - where film-cameras take images at a fps slightly higher than the revolution frequency (or mutiple thereof).

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(guest) - 11 years ago
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  Thanks Einstein  

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