Re: bad sound with linux?

H. Peter Anvin (hpa@transmeta.com)
18 Feb 1998 18:35:38 GMT

Followup to: <199802181228.NAA06945@relay.germany.net>
By author: 101.83988@germanynet.de (Karsten Patzwaldt)
In newsgroup: linux.dev.kernel
>
> hi!
>
> i've got a serious problem with ALL linux kernels: if i try to
> sample some songs from an audio cd under win95, everything works
> fine. but doing the same with linux produces a sample with very bad
> quality, recorded over the internal cd-audio line. if i connect a
> cable from the headphone -output on the cd-rom drive to the
> microphone-input on the soundcard the results are also bad, only if
> i connect from headphone-output to line-in it works fine, the
> samples are not perfect, but it works. i also hear my cpu if i
> compile the kernel or encode a mpeg3-stream. is it my fault or is
> there a bug in the sound-driver? i don't think it's the hardware, it
> works under win95.
>

You should use cdda2wav for this stuff. There is no reason at all to
do a digital->analog->digital conversion for this stuff. This will
give you *much* better samples than you could possibly do by any means
that would involve a DAD conversion.

The interference you're picking up is most likely hardware-related,
although the way Linux uses the hardware may differ from Windows 95
(some people would say "... the fact that Linux uses the hardware
..."). This kind of electric interference is very common in audio
systems overall.

-hpa

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