[ntp:questions] How bad is USB?

David J Taylor david-taylor at blueyonder.not-this-part.nor-this.co.uk.invalid
Mon May 11 15:45:45 UTC 2009

David Malone wrote:
> "David J Taylor"
> <david-taylor at blueyonder.not-this-part.nor-this.co.uk.invalid>
> writes:
>> I know it's off-topic, but how far apart in time does two singers, or
>> choir, have to be before you notice?  (No, I'm not suggesting a
>> spoken ref clock  <G>).
> If you have an small orcestra between a conductor and choir, the
> choir can be a good bit behind the conductor unless they watch
> rather than listen. This is probably only a matter < 10m (though
> I suspect the effect is not just due to the speed of sound, but
> also due to the compounding of people's reaction times).
> David.

So given the speed of sound, that must be less than 30ms, and within the 
10-100ms range which Bill gave.

So far, my USB-synced clock seems to be within a millisecond, so certainly 
better than just using an Internet connection (at least with /my/ Internet 


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