3 Nov
2008
3 Nov
'08
5:18 a.m.
On Mon, 03 Nov 2008 19:06:49 +1030
Matthew Smith <matt(a)smiffytech.com> wrote:
Quoth Arnold Krille at 2008-11-03 18:57...
It sounds like no resampling is happening there. If you play back
48kHz audio at 44.1kHz it will be slower and at lower pitch. It's just
playing back fewer samples per second than it's supposed to.
Philipp
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...
Interesting. I wonder, does it explain this?
Whilst I use fully external ADC/DACs for music use, with the HDA card
disabled, for everyday use - which means Skype since I don't do any
other sort of everyday audio - I use a Zoom H2 as my microphone/input
sound card and have headphones plugged into the on-board HDA.
If I have the H2 set to sample at its default of 44.1ksps, playing
back my voice on a Skype test call, I sound like someone who should
be guarding a hareem ;-) Setting the H2 to sample at 48ksps, I sound
my <cough/> "normal" self.
Would it just be at the receiving end of the loop that my voice is
pitch-shifting, or is there some funny re-sampling going on in the
Skype software?
I'm just so glad that I tested the sound before calling a client!
Cheers
M