linuxaudio.org

hollunder@gmx.at wrote:

quoted text
> On Thu, 02 Apr 2009 11:16:39 +0200

> Atte André Jensen  wrote:

>

>> Hi

>>

>> 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?

>>

>

> Hi Atte.

> I made the same mistake at first.

> Simply don't use a microphone, just a patch cable.

> Latencies are calculated by frames/samplerate, the resulting numbers

> are milliseconds.

Aside from that, make sure that you don't have any hardware monitoring

enabled on the channel the jdelay signal is generated on.
Greets,
Pieter

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