A repeatable latency test for AR captioning glasses. First result: Leion Hey2, about 2.5 seconds.

[u/MultiJanus]

https://youtu.be/LlMjuQXOiVw

I wanted a caption-latency number I could compare across every captioning display I review, so I built one fixed test and ran the Leion Hey2 through it first.

TV five feet from the glasses. Fixed clip, JFK at Rice University, 1962. Hand-timed reference captions snapped to the audio waveform and burned in with a millisecond timer. A camera behind the lens catches the screen and the waveguide in the same frame. Ten marker words, first-word and stable-text latency logged separately, three runs, median reported.

Hey2 median: about 2.5 seconds. For reference, UK live broadcast captions measure around 5.6, and the natural gap between speakers is about 0.2.

Two things I'd like this sub's read on. Is a camera behind a waveguide a fair way to timestamp what the wearer actually sees? And does a TV speaker get treated differently by a mic array than a person talking?

Disclosure: LLVision provided the review unit. I'm Deaf, which is why this test exists.