The key jingle experiment is detecting a phase difference between ears. I was writing about our ability to know if a sound is "in time" with some other sound. For example if a bass player is keeping time with a drummer. I figure we can do that to about 20 ms or maybe a little better. Apparently clicks are easier to hear. The problem we were solving was Determining if two clocks were in sync by listening to the ticks.
I don't think you need two iPhones to experiment with audio perception. A computer that can produce stereo audio and a pair of headphones would be enough Or a pair of speakers. There is lots of good quality audio software, some of it free that allows you to make sounds with various delays. My guess is that most people reading this already own the required equipment, less the software. On Wed, Apr 1, 2015 at 1:50 PM, Hal Murray <hmur...@megapathdsl.net> wrote: > > albertson.ch...@gmail.com said: >> Sound travels at about 1 foot per ms. So you can effectively delay the click >> on one phone my placing it 8 feet farther away then the other phone. >> Adjust the distance until the clicks seem to occur at the same time. That >> said, I doubt your ears are sensitive enough to work at the single digit ms >> level. > > Your brain uses the difference in arrival times at your ears to determine > direction. That works better with high frequency clicks rather than low > frequency rumbles. You can work out how good it has to be to get reasonable > results, but it's well below 1 ms. > > The usual test case is to jingle some keys. Sit on a stool with your eyes > closed. Have a friend jingle the keys in various locations. Right-left > works well. Up-down doesn't work very well. > > It would be fun to play with a pair of beeping iPhones and see what sort of > direction they appear to be coming from. I wonder how much the length of the > beep influences things. > > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.