At Sun, 27 Apr 2008 02:38:06 +0300, Sergei Steshenko wrote: > > On Sat, 26 Apr 2008 10:10:46 +0200 > Takashi Iwai <tiwai@xxxxxxx> wrote: > > > At Fri, 25 Apr 2008 20:45:03 +0300, > > Sergei Steshenko wrote: > > > > > > On Fri, 25 Apr 2008 16:23:06 +0200 > > > Takashi Iwai <tiwai@xxxxxxx> wrote: > > > > > > > At Fri, 25 Apr 2008 16:19:38 +0200, > > > > I wrote: > > > > > > > > > > At Thu, 27 Mar 2008 01:58:50 +0100, > > > > > 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" > > > > > > > > > > Or "speexrate". This is usually much faster. > > > > > > > > And forgot to write: you don't have to add anything to asoundrc for > > > > speexrate plugin. Install it, then alsa-lib will pick it up > > > > automatically. > > > > > > > > > > > > Takashi > > > > > > > > > > After some web search I see that there are several quality settings for > > > "speexrate". > > > > > > How does one choose/change the quality settings ? > > > > Use "speexrate_best" instead of "speexrate", for example. > > See alsa-plugins/doc/speexrate.txt for details. > > > > > > Takashi > > > > Thanks. > > I've just read > > /usr/share/doc/packages/alsa-plugins/speexrate.txt > > file and I understand its contents, specifically, the > > " > Or, more easily, define a global variable "defaults.pcm.rate_converter", > which is used as the default converter type by plug and rate plugins: > > defaults.pcm.rate_converter "speexrate" > > Write the above in your ~/.asoundrc or /etc/asound.conf. > " > > part this way: > > I can edit /etc/asound.conf file and add, say, > > defaults.pcm.rate_converter "speexrate_best" > > line anywhere in the /etc/asound.conf file, > > Is this understanding correct ? Yes. > I read the file on my SUSE 10.3. laptop, hope it's good enough version. > > ... > > I've just discovered there is no /etc/asound.conf file on my laptop: > > " > sergei@z61m:~> ls /etc/asound* > /etc/asound.state > sergei@z61m:~> > ". > > Should I create /etc/asound.conf ? Should it contain just one > > defaults.pcm.rate_converter "speexrate_best" > > line ? Yes. But I guess you barely notice the difference of output quality from the default "speexrate" (although you'll notice the difference of CPU usage :) 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
