Standards are great, especially when backed up by a great organisation.
InfoComm International® is the trade association representing the professional audiovisual and information communications industries worldwide. They publish various standards for systems design, installation, commissioning, and testing for AV systems that are used as the bases for many projects.
One particular standard is the “Audiovisual Systems Performance Verification Guide” that covers AV synchronisation in a couple of the sections, in particular;
Sections “AVP-103 Audio/Video Sync” & “AP-119 Audio System Latency” deal with measurements (or metrics in standard speak) and the limits for latency errors and broadly how to measure the error.
Unfortunately these state that to measure these things you should use a Dual Trace Digital Storage Oscilloscope to do so. If you haven’t seen one of these, here is a picture of one. They are exceptionally handy pieces of test equipment, this one is our 4 channel scope, it is busy decoding an I2C data bus, but that is a story for another day…
Now whilst you can use one of these, and make your own sound and light sensors to take measurements, we believe it’s much easier to simply use a Sync-One2 and have it give you the reading in milliseconds directly off the display. Especially as ideally you average a number of readings to ensure the system is stable, which a Sync-One2 can do in real-time.
These standards were written back in 2013, before we designed Sync-One2 to solve this exact issue, perhaps they could do with an update…?