From: Chris Albertson
I think the question really was "How close must two visual clock
displays be to be perceived as being exactly in sync?". Some people
(but not me) can see a 1/10 second difference and to me a one second
difference is obvious. The answer is likely between 1.0 and 0.1
seconds. But if you add a "tick" every second then the 1/10 second
difference is very easy to hear but most people can't hear a 1/40th
second difference.
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In HDTV, the BBC report that an offset of 20 milliseconds between sound and
vision can be identified by most users, and they have achieved 2
milliseconds in tests.
https://tech.ebu.ch/docs/techreview/trev_2009-Q1_HD-Audio-Delays.pdf
Cheers,
David
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
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