8 Jan
2012
8 Jan
'12
2:29 a.m.
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And thanks for your reply as well!
On Sat, 07 Jan 2012 00:20:38 +0100
Clemens Ladisch <clemens(a)ladisch.de> wrote:
Good point. But they don't typically share those IRQs, do they? Or if
they do, isn't it with a PCI slot, so that you might benefit by moving
anything in that slot?
I've certainly had some audible noise generated by video activity, but
not a lot and it's rare. But I wouldn't want it if I was trying to
record the cleanest signal possible.
Just to make sure I understand what you're saying here: 24/96 means
2.3Mbps, so full duplex would mean 4.6Mbps, which is less than the
USB1.1 12Mbps hard limit. But there's so much overhead in USB traffic
that you don't really ever come close to having 12Mbps available in
USB1.1, and in fact wouldn't have 4.6MBps available for one channel
24/96 full duplex? Do I have you right?
Thanks again!
- -c
- --
Chris Metzler cmetzler(a)speakeasy.snip-me.net
(remove "snip-me." to email)
"As a child I understood how to give; I have forgotten this grace since
I have become civilized." - Chief Luther Standing Bear
Chris Metzler wrote:
Yeah, this was one of the questions I meant to ask, and forgot --
whether there are PCIe options.
PCI
---
Cons:
- Outdated technology -- PCI slots being slowly phased out of modern
motherboards
In the consumer space, sound cards are switching over to PCI Express.
- Latency
tuning possibly required (identifying IRQs associated with
PCI slots and picking slot accordingly)
USB and 1234 controllers are PCI devices too, so you have exactly the
same IRQ problems, except that you cannot change the slot of an
onboard device.
-
Computer-caused interference noise possible unless audio
converted to digital domain outside computer
I don't think this is a problem in practice. I've never heard of
actual noise problems of PCI audio interfaces; all the reports I did
hear were from cheap USB devices that picked up noise from the
computer's power lines.
(Asus and Creative are in a fight over who can build the sound card
with the highest SNR value, and achieve 118 dB when recording, but
these cards are designed for "HiFi enthusiast" consumers.)
USB
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Cons:
- A single 24/96 channel means 2.3Mbps; 12Mbps nondirectional hard
limit under USB 1.1 so only 2 channels full duplex,
USB has lots of overhead. It can just barely fit eight 16/48 channels
into USB 1.1; full-duplex 24/96 is not possible.
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