Hello,
I am trying to get a Hammerfall HDSP 9632 card to work under
Linux. So far, I got success - however, whenever I record
anything, it appears the sampling rate that is used to record is
actually half the sampling rate specified.
For example,
arecord -d 2 -D hdsp_adat -f S16_LE -c 2 -r 48000 output.wav
should record two seconds at 48 kHz. However, the command takes
four (wallclock) seconds to complete, and produces a wave file
which sounds "too high-pitched". Editing the wave header to
change the sampling rate to 24 kHz results in a sample with the
correct pitch.
This happens when recording from analog or ADAT input.
Playback appears to have the same problem, it takes twice as long
as it should. I must confess I have not yet gotten any actual
sound from the card, but that's a second priority - the purpose
of the card is recording.
Changing the card to "Hi speed" mode and recording at 96 kHz
appears to produce a sample that's really 48 kHz.
I'm running Debian Etch with the 2.6.18-5-amd64 kernel on an
AMD64 system (Intel Pentium D CPU at 3.00 GHz). The same symptoms
appear though when I boot an i386 Kernel - I've tested this with
Knoppix 5.1 and its 2.6.19 kernel.
my .asoundrc is:
pcm.hdsp {
type hw
card 1
}
ctl.hdsp {
type hw
card 1
}
pcm.hdsp_analog {
type plug
ttable.0.6 1
ttable.1.7 1
slave.pcm hdsp
}
pcm.hdsp_adat {
type plug
ttable.0.0 1
ttable.1.1 1
slave.pcm hdsp
}
(note I have to change the channel numbers for hdsp_analog when switching from
"48 kHz" to "96 kHz" mode)
Is this a known issue? Is there anything I could try, like a different
driver version?
Thanks in advance,
--
Andreas Trottmann
Werft22 AG
Tel +41 (0)56 210 91 37
Fax +41 (0)56 210 91 34
Mobile +41 (0)79 229 88 55
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