Clock drift test app


This is the first of three proof of concept programs, so not intended for public release.

I need to determine very, very accurately how quickly the internal clocks in two devices drift apart. The two systems are a Mac OS X desktop, and an iOS iPhone.

There are various ways that can be done, but I'm open to all proposals. The tricky part is establishing known precise synchronization to begin with.

This could possibly be done by eye, perhaps by displaying a screen that inverts black to white each second with the means to adjust one to match the other.

Or by both systems emitting a brief sound every second, that would occur simultaneously (sound as one) if both devices were in synch, and two once they drift.

NB: I worry that simple playback of media files might drift away from even the clock (dropped frames, etc.), so a programmatic solution that remains cued to the clock is preferable.

A more sophisticated solution would involve detecting a common signal, perhaps video, perhaps audio that would function as a clapper-board. Please see the attached media file that could be used for this.

Skills: Mobile Phone

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Project ID: #2674550