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RME User Forum → Miscellaneous → DC (Direct Current) Filter somewhere available?
hi, i own a fireface UXC II now and am amazed by the quality, also in terms of DA conversion. i note a detail:
in the spectrometer, if i include the option 'show DC in 20hz band', i can see a significant amount of direct current (0hz) arriving at the ouput.
is there any way to filter this out?
hi, i own a fireface UXC II now and am amazed by the quality, also in terms of DA conversion. i note a detail:
in the spectrometer, if i include the option 'show DC in 20hz band', i can see a significant amount of direct current (0hz) arriving at the ouput.is there any way to filter this out?
You can apply a low-cut filter at the output, but I'd also try to find out why the DC component is in the signal in the first place.
Also, what is your signal chain after the UCX II? Probably, your downstream equipment takes care of DC filtering by its own means.
thanks .. yes i am doing this, i apply a low cut filter with 18db/oct at 20hz. it seems to me that the cutoff is not 'complete', but at 0Hz (DC) it should actually be ..
when i have a look using digicheck ng, after applying the filter, the 20Hz band shows significantly lower level, but the delta when turning on the 'show DC' option is still visible, even though smaller.
You most probably not only see DC but still some infrasound junk of a few Hz. The filters (bands) natiurally have limited separation to the next band.
thanks matthias.
so if i switch on the 'include DC into the 20hz band' filter option, this basically means some junk infrasound is added to this band by that function as well, so why is it named 'include DC in the 20hz band'? it should be named 'include all frequencies below 20hz into the 20hz band' or i am wrong?
it sounds to me like some dc offset removal function may be needed in addition, just in case one wants to eliminate sending this. not sure if this is relevant at all, but i just stumbled across it .. or also, adding a 10Hz, a +0-10Hz and a 'DC band / 0Hz only band' in addition, for clarity's sake.
the fireface ucx II unleashes a healthy obsession with how good the music can actually sound, thanks a lot for making this possible.
thanks matthias.
so if i switch on the 'include DC into the 20hz band' filter option, this basically means some junk infrasound is added to this band by that function as well, so why is it named 'include DC in the 20hz band'? it should be named 'include all frequencies below 20hz into the 20hz band' or i am wrong?
it sounds to me like some dc offset removal function may be needed in addition, just in case one wants to eliminate sending this. not sure if this is relevant at all, but i just stumbled across it .. or also, adding a 10Hz, a +0-10Hz and a 'DC band / 0Hz only band' in addition, for clarity's sake.
the fireface ucx II unleashes a healthy obsession with how good the music can actually sound, thanks a lot for making this possible.
You still didn't tell us what is connected to your UCX II's outputs, that is, what is the equipment that you want to protect from DC?
And the question is, if it is DC or just subhamonic signals. And if it is really DC, how big it is comparing to the rest of signal. And also, proper audio signal should be symetrical with no DC part.....
in the spectrometer, if i include the option 'show DC in 20hz band', i can see a significant amount of direct current (0hz) arriving at the output
Before doing anything else, I would use a voltmeter to investigate to see if there is DC in the chain somewhere, since it could indicate a fault.
Or one may use osciloscope in DigiCheck to have a look if there is visible stable offset of signal (DC).
It may be so that certain plugin may, because of many reasons, generate subharmonical signals that are close to 0 Hz.
And, Christinan, you wrote that there is significant amount of DC shown in spectrogram, but have not given the value.
thanks for answering. this is mostly about 5-10db difference in the '20hz including DC' band. i tested this a bit further and also using source material lacking any substantial 'deep' signal parts in the audio, eg. (high quality) classical quartet recordings, and then if there is anything at all in that band, it is probably below -70db (since nothing shows in the digicheck spektrometer) and the option 'include DC in 20hz band' does not show any difference at all then as well.
and thanks for the osciloscope tip, this does not show anything either. it may be as matthias was suggesting, some 'infrajunk' or such. i was just conceptually irritated by the band increasing levels by around 5-10db or so, if there is signal at that band if i turn on the 'show DC' option, which looked like an error to me (since DC is not equal to 'infrajunk'). but this may be just a very minor thing or some physical artifact.
i am not really worried about my equipment, but if you like to know, there is a small velodyne microvee subwoofer connected, and then a pair of adam d3x monitors. it sounds great with the rme fireface ucx 2. not as clean as a neumann setup, but sounds fantastic 
RME User Forum → Miscellaneous → DC (Direct Current) Filter somewhere available?
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