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. > > Rene. > > -- William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273 Physics&Astronomy | Advanced Research | Fax: +1(604)822-5324 UBC, Vancouver,BC | Program in Cosmology | unruh@xxxxxxxxxxxxxx Canada V6T 1Z1 | and Gravity | www.theory.physics.ubc.ca/ ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
