[alsa-devel] C-Media CMI8738-LX noise in recording from line in

Lars Schotte lars.schotte at schotteweb.de
Thu Apr 1 13:00:55 CEST 2010

OK. but the question is, does it put noise in recording in windows as
well? I maybe solved it w/ activating the old hd audio integraded snd
card, whichs broken, but line-in works and i tried it recording w/ it
and that works perfectly. you say, that the cards never going to have a
good sound quality. I am sure it doesnt, but what I am getting isnt
even good enough. there is written on the box that I can record with it
in 44khz and so on, cd quality and whatever, so is it a lie?

i tried out manipulating w/ the mixer, believe me, however, i ll post
some output later, but the settings can not be set better, because the
only relevant setting here is the line-in and that is already on
maximum. the second thing that i dont understand about this card is,
that when I play sth at line-in, the sound is perfect, but the
recording is crappy. so does it have a line-in to line-out passthrough?
but then hows that possible that I can regulate it on my mixer and even
mute line-in completely?

On Thu, 01 Apr 2010 11:52:38 +0200
Clemens Ladisch <clemens at ladisch.de> wrote:

> Lars Schotte wrote:
> > The soundcard has following chipset - C-Media CMI8738-LX.
> This chip was designed before on-board sound devices were common, and
> manages to have worse analog sound quality than many of those,
> especially on its inputs.
> > So I try to record from the line in input, ...
> > its too silent and there is a lot of noise in it.
> Even if your current mixer settings are suboptimal and can be improved
> (please show the output of "amixer contents" or the alsa-info output),
> be aware that this card never will have good quality.
> Regards,
> Clemens
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Lars Schotte @ romy

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