[LAU] Sample rates

[Bob van der Poel]

On Thu, Feb 14, 2013 at 9:03 PM, Ralf Mardorf
<ralf.mardorf at alice-dsl.net> wrote:
> On Thu, 2013-02-14 at 20:32 -0700, Bob van der Poel wrote:
>> Now, if I have an app like audacity set to 48K does it (or jack?) send
>> a message to the box to enable 48 (or 44.1)? If that is the case, I
>> assume that using 44.1 or 48 should have the identical latency issues?
>> 48K should send a bit more data back to the computer?
>
> All audio devices I know automatically are set to the sample rate set by
> alsa, 'jackd -d alsa --help'.
>
> No, the latency will differ for different sample rates:
>
> 512 samples / 44.1 kHz = 11.609977324 ms
> 11.609977324 * 2 = 23.219954649 ms ≈ 23.2 ms
>
> 512 samples / 48.0 kHz = 10.666666667 ms
> 10.666666667 * 2 = 21.333333334 ms ≈ 21.3 ms

Is this saying that a higher freq will result in lower latency? Guess
that makes sense since higher freq contains more data.

> Higher sample rate = more data at equal bit depth.

Guess there really is no reason not to use 48K then.

Thanks.

-- 
**** Listen to my CD at http://www.mellowood.ca/music/cedars ****
Bob van der Poel ** Wynndel, British Columbia, CANADA **
EMAIL: bob at mellowood.ca
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