Re: Digital noise from USB DAC device
On Mon, Mar 02, 2015 at 09:45:13PM +0200, Teemu Likonen wrote:
> I got a new USB DAC device (digital to analog converter, a "sound card")
> and I'm having problems with digital noise.
>
> Music goes directly to the device without any mixers, like this:
>
> mplayer -af-clr -ao alsa:device=hw=1.0 -format s32le [...]
>
> And it plays nicely. But with high-dynamic classical music I need to
> turn amplifier's volume up more than usually and it reveals some sort of
> digital noise. Here's a short recording of the sound (file size 1.2MB):
>
> http://koti.kapsi.fi/~dtw/usb-dac-digital-noise.flac
>
> That's from my Debian 7.8 box. But when I use the DAC device in my
> Macbook Air (OS X) and play the same music files, there is no noise. So
> I think it must be my Debian software stack or a hardware issue.
>
> Any ideas about solving this?
The static part could easily be introduced in mixing; check
alsamixer that everything non-essential is turned down to zero.
The tweedle noise sounds like hardware, though.
-dsr-
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