[LAU] jdelay

Robin Gareus robin at gareus.org
Tue Apr 10 19:44:29 EDT 2007



Fons Adriaensen wrote:
> On Wed, Apr 11, 2007 at 12:09:03AM +0200, Robin Gareus wrote:
>> Fons Adriaensen wrote:
>>> I missed the start of this thread, so I don't know what exactly you
>>> want to do... If it's measuring the latency of you soundcard, just 
>>> cocnnect line out to line in !
>> yes, just measuring latency, If I can get more info it does not hurt,
>> though.. - I just connected a mic to jdelay  and jdelay's out to a mono
>> quaker, though now I do have a 3-way speaker but jdelay does not use the
>> bass..
> 
> Why use speakers, headphones or mics ? Just use a cable !! Things should
> work then....

indeed ;) so -p64 -n2 -r 48000 on a 2.6.21-rt via USB yields a total
round trip latency of

   376.759 frames
   376.759 frames
   376.760 frames
   376.760 frames
   376.759 frames

<8ms. Great!

but it's not really fun w/o a PA.  ..I'm just measuring my stereo in the
living-room with aliki..  thanks for these great tools!

BTW. would it be unreasonable to "fix" jdelay to work with an amp&mic ?
Does the phase-measurement depend on electrical characteristics that get
"blurred" in mid-air? - Is there documentation for the algorithm used in
jdelay ?



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