On 03/21/2007 05:38 PM, Rene Herman wrote: > On 03/21/2007 04:34 PM, Jean-Marc Valin wrote: >> It's worse than you think :-) Try playing an 8 kHz file to a >> soundcard that only does 44.1/48. It's just horrible. > > Trouble is that I don't have a soundcard that can only do 44.1/48. > I'll go hack up a driver to pretend I do though and try. Have a nice > 8 kHz file I can try with? :) I grabbed http://www.speex.org/samples/audio/male.wav and tried using a Crystal CS4236 based card (hw:1). With an ~/.asoundrc containing: pcm.up1 { type plug slave { pcm "hw:1,0" rate 44100 } } the difference between aplay -D hw:1 male.wav and aplay -D up1 male.wav, Is indeed very significant. When I tried with hw:0, an "ESS Canyon3D" (ES1970MS-3D) based card, I was in for a bit of a suprise though. Have never been aware of it, but it seems this card upsamples internally anyway. Both hw:0 and up0 (same as above) sounded almost if not completely the same. I never really play anyting other than 44100 or 48000 to the card but it's not nice. It's a (once) expensive "TerraTec DMX"... Resampling upfront with: sox male.wav -r 48000 male_sox.wav resample -q sounds somewhat like male.wav on hw:1 again (for some reason, it won't do 44100). Anyways, yes, a very significant difference... Rene. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
