News for hackers. Stuff that matters.

A comment on Machine that Levitates Objects Using Sound [video]. Parent comment

Re:Machine that Levitates Objects Using Sound [video] by nitrogen on Thursday January 02, 2014 @06:03PM (#7003020)
Could you run an FFT on the image you want to display as a starting point for figuring out what frequencies you need?
[ Parent | on HN ]
Re:Machine that Levitates Objects Using Sound [video] by HCIdivision17 on Thursday January 02, 2014 @10:34PM (#7003990)
I always assume that you can figure out the needed FFT for a result, but having never actually tried, I have no idea if it's a fallacious assumption left over from working with lasers for a bit.

Some EE out there should have a strong opinion on the topic, might call up a friend about it.

[ Parent | on HN ]