Moin Jaroslav! Jaroslav Kysela schrieb am Sunday, den 30. November 2003: > > I have some problems with a ac97 based sound card (Notebook built-in) > > where the kernel driver works fine (except of not beeing able to > > resample on-the-fly). > > > > When I set the PCM mixer volume to more then 50%, I hear few sound > > fragments. If I go over 75% I hear them all the time and on 100% PCM, > > the sound is full of scratching fragments. You can get an example > > catched with microphone on > > http://sites.inka.de/W1752/alsa-distortion.ogg and the original is on > > www.vorbis.com/music/Mists_of_Time-4T.ogg . First I suspected a speaker > > problem since it sounds very similar to overloud speaker setting, but it > > is not! > > Are you sure that you don't have enable any other analog input? My > notebook has very noisy build-in microphone for example.
No, my microphone is not built-in and not attached, the mixer is set to 0. > Also note that if you have value over 70% with most of AC'97 controls, the > analog gain is applied to the signal (thus you can really overdrive the > output or input). After almost an hour playing different stuff with different settings with the ALSA, Linux-Kernel and Windows driver, I have the following assumption: both, Kernel driver and Windows driver are cheating! They do not present the Bass/Treble boost controls and the PCM volume at 75% in ALSA is quite comparable with 100% PCM volume with other drivers, having quite comparable quality when Bass/Treble boost were set to 0. So what I wish for the future version of ALSA drivers: a module option to set the real mixer scale for PCM (or other sources) between 0 and X percent while the visible scale is between 0 and 100 percent and recalculated internaly to 0..X%. But back to the second problem, I created a live example on http://sites.inka.de/W1752/b.ogg - you can hear the fragments on time points 0:35 and 1:31. MfG, Eduard. -- Wer gar zu viel bedenkt, wird wenig leisten. ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
