3 Nov
2008
3 Nov
'08
4:27 a.m.
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/
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