Re: [LAU] using jdelay

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
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Received on Thu Apr 2 16:15:02 2009