[LAD] Document on using Jack Apps

[Rui Nuno Capela]

On 07/31/2010 11:23 PM, Arvind Venkatasubramanian wrote:
> Hello:
> 
> I am very much new to Linux and Linux audio.  I am trying to measure
> audio IO latency for my system.
> Jdelay seems to be the right tool but when I run it on the terminal, I
> am getting message "Signal below threshold..." which probably might be
> because Jack is trying to capture audio and ends up getting the low
> noise floor because I do not have meaningful signal source connected.
>  But then I tried to patch the this App to the qJACKctl app but the
> settings console is not straight forward to interpret. as it involved
> many parameters.
> 
> I guess there are # of frames per period that may eventually be used
> to calculate the target latency but *is there a step-by step document
> description for Jdelay and any other JACK tools and also using JACK
> audio server in an effective manner*?  Also, qJACKctl console does not
> offer options for very low sampling rates like 8 KHz.  With ALSA, this
> should be possible but may be this particular tool does not support it.
>  Can anyone help here?
> 

re. qjackctl settings you can actually write whatever sample-rate you
want. you're not limited to the options given in the drop-down list.
however, that doesn't mean that the soundcard will stick to it, ever :)

cheers
-- 
rncbc aka Rui Nuno Capela
rncbc at rncbc.org