On Sun, 22 Nov 2009 18:58:56 +0100 François Patte <francois.patte@xxxxxxxxxxxxxxxxxxxx> wrote: Note that I'm running F12 x86_64 so there might be some differences between your system and mine. > >> My sound card (Realtek ALC 882 integrated on Asus P5WD2 mobo) is > >> working but the sound is not clear: a lot of interferences (bzzzz, > >> criccroc...), so, in piano passages of record, I can ear more > >> electronic sounds than music.... > >> > >> Is there a way to have no background noise? > > On the fly resampling can lead to artifacts > > such as you describe. > > > > The sound card does the best it can under all circumstances given > > the input and output. There really isn't any configuration unless > > you are using the wrong driver. > > I did not install any driver, the sound card was working out of the > box after install. > > How can check this point? And, if necessary, where can I find the good > driver? Type the command aplay -l . If it says something like hda-intel alc882 then you are using the driver that alsa provides for your device. It is possible that the driver has an error in it. To check if the driver is working properly go into Applications->Sound & Video->Mixers->Pulseaudio volume control. Go to the last tab, configuration, and select off from the drop down list. Then play some music using alsa directly instead of pulseaudio. If the noise is still there, it is the driver. If this isn't present on your system, you might be able to use pulseaudio --kill to accomplish the same thing. For instance if you use audio player to play a song from a CD, make sure that the preference says to use alsa and that the frequency shows as 44100 while playing. Alsa too has a simple mixer that is very crude and so can introduce noise. By making sure that the sound is playing at the recorded rate you eliminate any possible resampling. > > How does it get to the sound card? > > This, I don't understand/know. pulseaudio is working. I am a member of > pulse-rt group. I thought there might be some intermediate processing before the sound reached the sound card. > > > > Is pulseaudio running? Have you configured it with pavucontrol? > > I don't understand how to configure anything with this: I can only > modify a level, but how can I know what is the good level? I think you are thinking of the vu meters. The application I am referring to here is the one above used to adjust volume and configuration. I meant have you selected it to use the proper output format, e.g. stereo analog or digital 5.1, etc. > > > > > Are frame rates consistent throughout? > > I don't understand this question! > CDs play at 44100, DVDs at 48000, streaming radio can be many different rates. If pulseaudio is running it can only use one rate, say 48000 and everything else has to be resampled to that rate. So a CD song at 44100 has to be turned into 48000. This can create noise. The reason this has to be done is that most computer sound devices do not do hardware mixing / resampling, so you can't send them sound streams of different frame rates. -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
