linuxaudio.org

On Thu, Apr 02, 2009 at 11:16:39AM +0200, Atte André Jensen wrote:

quoted text
> 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

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