Hi<div><br></div><div>Actually, there is some info that can be found here and there on some forums (see below)</div><div><br></div><div>JDelay is, from what I&#39;ve understood, a command-line tool that allows you to determine your sound card latency.</div>

<div><br></div><div>#1 : start jack</div><div>#2 : type jdelay in a terminal</div><div>#3 : patch connections in jack : input -&gt; jdelay, jdelay -&gt; output, you should get a tone in your speakers</div><div>#4 : latency is calculated, using phase difference between input and output</div>

<div>#5 : in the terminal, the latency is printed in msec.</div><div><br></div><div>It never worked on my soundcard, &quot;signal below threshold&quot; was all that was printed in my terminal.</div><div><br></div><div>You can find info here :</div>

<div><a href="http://old.nabble.com/using-jdelay-td22843924.html">http://old.nabble.com/using-jdelay-td22843924.html</a></div><div><a href="http://old.nabble.com/using-jdelay-td22843924.html"></a><a href="https://help.ubuntu.com/community/UbuntuStudio/FireWire_Recording">https://help.ubuntu.com/community/UbuntuStudio/FireWire_Recording</a> in Preconditions/measure your latency</div>

<div><a href="http://wiki.linuxproaudio.org/index.php/Howto:latency_measurement">http://wiki.linuxproaudio.org/index.php/Howto:latency_measurement</a></div><div><br></div><div><a href="http://wiki.linuxproaudio.org/index.php/Howto:latency_measurement"></a>jy<br>

<br><div class="gmail_quote">2010/8/3 rob <span dir="ltr">&lt;<a href="mailto:rob@curates-egg.org">rob@curates-egg.org</a>&gt;</span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">




  

<div text="#000000" bgcolor="#ffffff">
On 01/08/10 19:37, Arvind Venkatasubramanian wrote:
<blockquote type="cite">
  
Thanks to Julien and Rui Capela.  Being a musician and engineer, this
seems to be a great place to land in and learn new stuff in this world
of Linux audio.  Currently, I am still not able to find document that I
need to solve 2 existing problems:
  <div><br>
  </div>
  <div><b>Question on using JDelay:</b></div>
  <div><br>
  </div>
  <div>I have only one web source that has some details about using
this tool:</div>
  <div><br>
  </div>
  <div><a href="http://www.kokkinizita.net/linuxaudio/" target="_blank">http://www.kokkinizita.net/linuxaudio/</a>  
and this reads:  &quot;It uses a phase measurements on a set of tones to
measure the delay from the output to the input&quot;.</div>
  <div><br>
  </div>
  <div>How do I use these phase measurements and how do I pass in these
tones?  Are they special tones?  What kind of oscillator do I need to
use to generate these special tones?  How do I pass in an audio tick or
click?  How do I do other settings?  </div>
  <div><br>
  </div>
  <div>$ jack_delay -h --help does not show me the help menu</div>
</blockquote>
<br>
<a href="http://wiki.linuxproaudio.org/index.php/Howto:latency_measurement" target="_blank">http://wiki.linuxproaudio.org/index.php/Howto:latency_measurement</a><br>
<br>
</div>

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<br></blockquote></div><br></div>