23 Jun
2006
23 Jun
'06
2:34 a.m.
Well, mixed results tonight.
I was able to get some sound to go across the ADAT
cables from the PC to the AW4416. But not good sound.
On the bright side, I think I more or less understand
connecting things up with jack, ecasound, and so on.
On the bad side, so far it's not working too well.
I monitored things with "jackmeter" and this meter
registered peaks near 0dB for the stuff I was playing
with ecasound, and pretty high levels for the most part.
On the AW4416, the levels were registering between -30dB
and -48dB. I guess I don't understand how ADAT works.
I was under the impression the signal going across the
cables was digital -- and so to get a reduction in levels
like that, I would expect some digital numbers would have
to go from being big numbers to being small numbers, which
seems unlikely thing to happen to numbers encoded as pulses
going down a cable. So I conclude I don't know how ADAT
works, except it's not as I imagined it did.
Oh, and besides a drastic loss of signal level, the signal
was distorted strangely. Hard to describe. This may be
due to xruns... I haven't got things to work without xruns
yet, but that shouldn't cause a drop in levels, right? Just
kind of choppiness, dropouts, crappy sound, right?
Transfering from the AW4416 to the PC did not work at all.
on capture_1 and capture_2, I got very low level white noise
apparently. Are those the s/pdif ports? On the other
channels input was dead silence.
I tried both ADAT ports on the RME board, with similar results
on each. I tried swapping the two ADAT cables in case one of
the cables was bad... this did not seem to make a difference.
Maybe the RME just transmits harder than the Yamaha, so it's
signal makes it across (just barely, crossing the finish
line at -48dB) while the yamaha's signal dies.
I did change the RME's frequency to 44.1kHz in qjackctl's
setup window.
Maybe there are some clues in here:
[root@zuul R15]# cat /proc/asound/R15/rme9652
RME Digi9636 (Rev 1.5) (Card #2)
Buffers: capture f6a00000 playback f6400000
IRQ: 10 Registers bus: 0xea000000 VM: 0xf88a2000
Control register: 48029
Latency: 1024 samples (2 periods of 4096 bytes)
Hardware pointer (frames): 1024
Passthru: no
Clock mode: autosync
Pref. sync source: ADAT1
ADAT1 Input source: ADAT1 optical
IEC958 input: Internal
IEC958 output: Coaxial only
IEC958 quality: Consumer
IEC958 emphasis: off
IEC958 Dolby: off
IEC958 sample rate: error flag set
ADAT Sample rate: 44100Hz
ADAT1: No Lock
ADAT2: Sync
ADAT3: No Lock
Timecode signal: no
Punch Status:
1: off 2: off 3: off 4: off 5: off 6: off 7: off 8: off
9: off 10: off 11: off 12: off 13: off 14: off 15: off 16: off
17: off 18: off
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