Re: Best latency I could expect using USB sound device

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On Wed, Mar 15, 2023 at 06:51:20PM +0100, Robin Gareus wrote:

> Very nice plots. Well almost, even though it's in the description I'd expect
> axes to have labels :)

:-)

> In case of P = 96, N = 3, do the 5 outliers cause x-runs

No.

> Have you calculated the average clock speed for all settings?

It is the same in all cases. I tested this when I developed an
app to log mains frequency some years ago. The sample rate error
doesn't matter much for the measured frequency, but it does for the
timestamps if you want to record this for e.g. 24 hours at exactly
on second intervals.

My plot for P = 48 and Giso's for P = 32 suggest there is something
happening at below 1 ms resolution. The question is where and how
this is done... The driver could use a timer and some extra buffering
to 'fake' a shorter period. But there would be no latency advantage
doing that...

Ciao,

-- 
FA


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