[alsa-devel] Verifying mixer dB data/Invalid dB data from USB cards, especially Aureon 5.1 MkII

[Raymond Yau]

2010/2/17 Lennart Poettering <mznyfn at 0pointer.de>

> On Wed, 17.02.10 11:30, Raymond Yau (superquad.vortex2 at gmail.com) wrote:
>
> >
> > 2010/2/16 Lennart Poettering <mznyfn at 0pointer.de>
> >
> > > On Tue, 16.02.10 09:08, Clemens Ladisch (clemens at ladisch.de) wrote:
> > >
>
> > >
> > >
> > if the program use a format FLOAT_LE  which is not supported by the
> hardware
> > and need to use plughw , you have already added error ( resampling and
> > format conversion ) to the result
>
> That numeric noise is neglible in contrast to the big (20dB or so?)
> discrepancy I am seeing here.
>
> Lennart
>


For HDA , some codec can playback/record in 16 , 20, 24 or 32 bits , if you
are using non-native format ,

I think there should be some practical difference when HDA codec use 16 ,
24, or 32 bits for running your test