2 Apr
2009
2 Apr
'09
7:30 a.m.
On Thu, Apr 02, 2009 at 11:16:39AM +0200, Atte André Jensen wrote:
I tried measuring my latency with jdelay. Started in
on the commandline,
first it said
Signal below threshold...
Then I connected it's input to the output of system:capture_1 with my
microphone connected and it output to the input of system:playback_1+2.
Now I get a squareish tone and when "singing" into the microphone I get
reading like these:
22442.483 Inv
58010.411 ??
43602.390 ?? Inv
43474.474
43474.474 ?? Inv
Signal below threshold...
Signal below threshold...
Signal below threshold...
25549.731 ??
25549.731 ?? Inv
37749.225 ??
37749.225 ?? Inv
37749.225 ??
24653.357 ??
24653.228 ?? Inv
25677.165 ??
11013.134 ?? Inv
25677.153 ??
2821.046 ?? Inv
2821.046 ??
The man page says the values are in samples, so for instance a value of
37749.225 should be 0.77 seconds at 48000, right? This seems bogus
(qjackctl reports 10 ms).
What am I doing wrong?
As far as I know you are not supposed to sing (at least to get proper
results from jack_delay it is not needed). :)
Just make a closed loop. jack_delay generates its own testing signals
(which are probably much easier to analyze than what you sing).
Hope this helps.
Jan