On 05/28/2010 05:05 PM, Robin Gareus wrote: > On 05/28/2010 02:31 PM, [email protected] wrote: >> Hello all, >> >> This week I had to perform measurements on a audio >> interface, and this resulted in some quite interesting >> results. Before revealing what happened, I'll let you >> have a look at some of the data and come up with your >> own conclusions, see >> >> <http://www.kokkinizita.net/linuxaudio/quiz.html> >> >> (Free beer at the next LAC for the best analysis) >> >> Ciao, >> > > Well, interpreting an 'experiment' that one has not conducted > him/herself without knowing _all_ parameters of the setup is not > something to encourage doing.. > > Did you use symmetric (XLR) connections? Are the sample-rate settings of > both cards identical? what was the physical distance between the devices > (cross-talk)? Was there any ground-lift equipment (built-in?) in place > or maybe you simply forgot to switch off phantom-power? > > Anyway, good that you've labeled it 'quiz'; so here's my guess: > > You're encountering reflections (or even standing-waves) in the cable. > (did you uncoil it? or was it a very short one?)
on 2nd thought (just been on the toilet) those could be in the order of -75db but they would not yield a symmetric spectrum as you presented. Sorry for the noise :) robin > Did you repeat the measurement? using different cables for example. > > Cheers! > robin > _______________________________________________ > Linux-audio-dev mailing list > [email protected] > http://lists.linuxaudio.org/listinfo/linux-audio-dev _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
