[ntp:questions] How bad is USB?
David J Taylor
david-taylor at blueyonder.not-this-part.nor-this.co.uk.invalid
Sat May 9 16:18:41 UTC 2009
Hal Murray wrote:
>> I'm in a third category (probably) - as long as my PCs "sound" to
>> have the same time, I'm happy. Actually, I want UTC as well, but as
>> I have a speaking clock working on two PCs it's "nice" when they
>> both speak at the same time. I wonder how close that needs to be -
>> a few milliseconds, perhaps? Here's what I actually get - all with
> The speed of sound in air is 1 ft per millisecond. So
> a difference of a few ms is only noticable if you are careful
> where you put your ears relative to the speakers.
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
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