At Wed, 26 Mar 2008 18:29:18 -0700 (PDT), Bill Unruh wrote: > > On Thu, 27 Mar 2008, Rene Herman wrote: > > > On 26-03-08 23:57, Bill Unruh wrote: > > > >> On Wed, 26 Mar 2008, Helge Fredriksen wrote: > >> > >> > Ok, here's what I found out: > >> > > >> > Since these cards seem to lack the support for doing frequency > >> > conversion in > >> > HW, you simply need to use the alsa plugin > >> > plughw instead of hw when referring to the card: > >> > > >> > arecord -Dplughw:0 test.wav > >> > aplay -Dplughw:0 test.wav > >> > >> AFAIK, alsa frequency conversion is pretty primative ( linear > >> interpolation) which produces a huge amount of noise/distortion. > > > > The default is, but if you install the alsa-plugins package (and > > libsamplerate) and add a line > > > > defaults.pcm.rate_converter "samplerate" > > > > in /etc/alsa.conf or ~/.asoundrc, things should be better (untested advice). > > The question is how much latency does that introduce. The latency isn't a big problem for this at all. It may cost a little bit more CPU power, but I'm sure you would never notice it even closely looking at xload, especially if you use speexrate plugin. Takashi ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
