Re: Trying to get arecord/aplay to work with M-Audio

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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

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