13 Dec
2008
13 Dec
'08
5:15 a.m.
Hi Dominic,
Dominic Sacré wrote:
...
An interesting table to put things into perspective.
The third column
doesn't seem right though. As far as I can see, the actual note values are
only half of those in the table (assuming bpm means quarters per minute, of
course). Makes the latencies appear a lot less dramatic from a musical
point of view :)
...
You are right of course. The strange thing is that I was looking over it
and over again, feeling that something was very wrong but I did not see
it. Thanks for pointing it out! :-)
Hope it's right this time:
Time in Length Note,
ms in m 120 bpm Comments
======== ======= ======= ===========================================
1000.00 343.00 1/2 en.wikipedia.org/wiki/Speed_of_sound
500.00 171.50 1/4 Common delay speed (echo)
250.00 85.75 1/8 "
125.00 42.88 1/16 "
100.00 34.30
62.50 21.44 1/32 Distande between people in a big orch.
* 46.40 15.92 Latency value
31.25 10.72 1/64 Playing real music that fast? Get a life!
* 23.20 7.96 Latency value
15.63 5.36 1/128
* 11.60 3.98 Latency value
10.00 3.43
7.81 2.68 1/256 Academic interest (musically)
* 5.80 1.99 Latency value
5.00 1.72 Dist. from ear to foot
3.91 1.34 1/512
* 2.90 0.99 Latency value, almost 1 meter
1.96 0.67 1/1024
* 1.45 0.50 Latency, common dist. to monitor
1.00 0.34 Not an uncommon distance to mic or wife
0.98 0.33 1/2048
* 0.73 0.25 Latency value
0.49 0.17 1/4096 of academic interest (musically)
The latency numbers is taken from qjackctl's setup dialog box when
frames/period are from 16 to 1024 on a 44100 sample rate system with 2
periods/buffer.
Jostein