On Fri, 15 Feb 2013 18:30:15 +0100, Bob van der Poel <bob@xxxxxxxxxxxx>
wrote:
On Thu, Feb 14, 2013 at 9:03 PM, Ralf Mardorf
<ralf.mardorf@xxxxxxxxxxxxx> 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.
Yes, equal settings for frames/periode and periods/buffer will result in a
lower latency at a higher sample rate.
Higher sample rate = more data at equal bit depth.
Guess there really is no reason not to use 48K then.
You should prefer 48 KHz, that it does take more data shouldn't matter.
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