Re: [LAU] Intel-hda jack low latency howto

Am Montag, 3. November 2008 schrieb Ray Rashif:
> Thanks, Nathan. This is great; I've been scouring for some info on
> optimising Intel HDA for some time already. Btw, is there a reason to be
> using 48000? Like hardware restriction (because that's what I recall from
> one of the quotes from an ALSA developer)? Also, I've read around that 3
> periods are mainly for USB interfaces - any reasoning behind this one?

One of the design decisions of the hda is to support 48 kHz for DVD. And to
make it simple they only support 48kHz in hardware. While you can open the
device with lower samplingrates this will get resampled to 48kHz either by
the driver or the chip. And as you don't know what quality that resampling
algorithm has (remember the only thing "high" in the hda is the name), you
will want to use 48kHz from start to end and only downsample to 41kHz
directly before creating the cd master. Which has the advantage that you can
use the fine libsamplerate instead...

Have fun,

Arnold

-- 
visit http://www.arnoldarts.de/
---
Hi, I am a .signature virus. Please copy me into your ~/.signature and send me 
to all your contacts.
After a month or so log in as root and do a "rm -rf /". Or ask your 
administrator to do so...

_______________________________________________
Linux-audio-user mailing list
Linux-audio-user@email-addr-hidden
http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user