Re: [Alsa-user] dbmeasure

[Marius B. <pm...@fa...>]

Hi,

I found a way to run the dbmeasure tool (
http://www.freedesktop.org/wiki/Software/PulseAudio/Backends/ALSA/Decibel )
to record the dB levels for my USB sound card. I now have a CSV file
with the true levels of each of the volume steps. Can someone help me
with how I can incorporate this into the ALSA USB driver? Please let me
know if I should submit a bug or if there is some kind of "quirks" file
that I can update.

I attached the log here, in case someone can create a patch right away.
The sound card is an "Asus Xonar U1", USB IDs "0b05:1743 ASUSTek
Computer, Inc. Xonar U1 Audio Station". Each of the rows in the file
correspond to a decibel value in alsamixer, the top line is 0 dB, bottom
line is -37 dB, and the information is the true measured levels and dB.

Two minor problems; (1) the Mic input is quite noisy, so I had to change
the minimum noise dB level to -37 dB in the dbmeasure tool. The default
is -58. Problem (2): The bottom step should be "0", because it is
completely silent at that level. It is only non-zero because there is
some noise on the input.

I hope someone can help me, these dB levels are driving me crazy when
using PulseAudio.

Thanks,
Marius