On 7/26/06, James Courtier-Dutton <[EMAIL PROTECTED]> wrote: > >> It could, even if the digital form of the signal is OK. Your card > >> may apply digital gain at the max setting (i.e. to allow you to > >> boost very weak signals). > >> > > > > Ah.. that's interesting. I take it that this is something internal to > > the hardware rather than the driver(?) > > > > Is there a method to determine the max setting before digital gain is > > applied? > > > I could tell you if you said which sound card you are using. Each sound > card is different. Some 100% is 0dB gain (e.g. snd-emu10k1), some 70% is > more like 0dB gain (e.g. snd-ca0106).
See below -- I thought I sent it to the list, rather than just the author: On 7/26/06, Clemens Ladisch <[EMAIL PROTECTED]> wrote: > > The levels in alsamixer are all set to 100 -- can this cause clipping, > > Usually not, but there is an AC'97 codec (the STAC9708/11) that distorts > its output at high levels because we don't know how to initialize it > correctly. > > > and if so, would this account for the aliasing? > > I don't know what effects clipping has in the frequency domain. > Does reducing the level help? > > > Regards, > Clemens > I'm using a Realtek ALC850 http://www.realtek.com.tw/products/products1-2.aspx?modelid=2003101 on an http://www.asrock.com/PRODUCT/775Twins-HDTV.htm, so I guess it's not the STAC9708/11 issue. Incidently noise levels on this thing are appalling -- you can hear noise just by moving the mouse, although the tests on this page suggest otherwise: http://www.ixbt.com/mainboard/epox/rmaa/9npa3j-alc850.htm I assume that this could be due to a bad analogue stage on my motherboard's particular implementation, as I imagine Realtek, just supply a chip(?) and the motherboard manufaturer supplies the rest. I will try reducing the level when I return home on Thursday. Thank you for the suggestions, Tom ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
