[LAU] [Music] Delta1010LT card

[Robert Edge]

oh for fucks sake

whatever



On Mon, Jul 18, 2016 at 12:59 PM, Tim E. Real <termtech at rogers.com> wrote:

> On Monday, July 18, 2016 10:30:47 AM EDT Robert Edge wrote:
> > Do whatever you want.  I can't explain it to you any more clearly.
> >
> > On Mon, Jul 18, 2016 at 10:25 AM, Len Ovens <len at ovenwerks.net> wrote:
> > > On Sun, 17 Jul 2016, Robert Edge wrote:
> > >
> > > If you don't believe me, do this simple test:
> > >> feed a 1kHz tone in to the input
>
> I already said that I did that and verified it works.
>
> Unless MAudio had started to make these cards without
>  a volume control chip, your distortion is upstream,
>  not from the 1010LT card.
> Or the card is not being used correctly. Check your settings.
> Are you sure the Patchbay/Router tab settings are correct?
> Or... your card has a partially fried preamplifier IC? Hey, it happens.
>
> This card has an ak4*** chip with full analog attenuator and amplifier.
>
> (And, uh... if /you/ don't believe /me/ then look at the 'About' tab
>  in Mudita24 and see who one of the authors is.)
>
> But seriously, I hope this helps in better understanding the card and
>  tracking down the real source of the distortion, which cannot be
>  a properly functioning card.
>
> Tim.
>
>
> > >>
> > >> set 'analog volume' control in software to 0dB
> > >>
> > >> connect to ardour or your choice of recorder with decent metering.
> set
> > >> meter
> > >> point to 'in'
> > >>
> > >> increase volume of test signal until you are getting 0dBFS.  no matter
> > >> how much
> > >> you increase the level of the test signal from here it will continue
> to
> > >> read
> > >> 0dbFS.  turn the signal generator up a good few dB so you are well in
> to
> > >> clipping.
> > >>
> > >> record a bit of this.  you will see a squared off wave.
> > >>
> > >> now turn down the 'analog volume' control until you are seeing a nice
> > >> comfortable
> > >> level.  do not change the level of the test signal generator.
> > >>
> > >> record again.
> > >>
> > >> the result will still be clipped.
> > >>
> > >> in fact it will be identical to the first signal you recorded, just
> > >> scaled down.
> > >>
> > >> I mean, you guys do whatever you want, but that is what is actually
> > >> happening in
> > >> your signal chain.
> > >
> > > How do you know this is digital and not analog clipping? The result
> would
> > > look the same.
> > >
> > > signal path:
> > >
> > > AC -> resitor -> buffer -> digitally -> ADC
> > > in    pad on     amp       controlled
> > >
> > >       card                 analog gain
> > >
> > > if the input signal after the input pad has p-p higher than amp's power
> > > rails allow, the signal will be squared off, just as you are seeing.
> The
> > > gain stage would be a part of the ADC chip BTW. The buffer amp is
> probably
> > > not, but rather a gain stage added to allow the use of mic level
> inputs.
> > > (M-Audio advertise it as a Mic Pre)
> > >
> > > --
> > > Len Ovens
> > > www.ovenwerks.net
>
>
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user at lists.linuxaudio.org
> http://lists.linuxaudio.org/listinfo/linux-audio-user
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.linuxaudio.org/pipermail/linux-audio-user/attachments/20160718/288b7f1a/attachment.html>