On Wed, Apr 1, 2015 at 9:33 AM, Reid Oda <reid....@gmail.com> wrote: ... Once we got this lock, the > clocks were then synchronized to within a few ms of each other. I estimate > 8 ms, but our method (listening to ticks from a homemade app) was not ultra > accurate.
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. Some musicians have learned to keep in time and can hear a 20ms difference. Most people can hear a 50 ms delay. But as the clicks get close we hear them as one sound If you have a computer with a microphone yo can record the clicks at some high sample rate and then look at the spike on the audio waveform. This WILL sub-ms clicks. -- 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.