Re: [linux-audio-user] Low latency USB 1.1 card?

From: Rui Nuno Capela <rncbc@email-addr-hidden>
Date: Sun Jun 12 2005 - 23:26:08 EEST

> Hi ce,
> On Sunday 12 June 2005 12:54, Christoph Eckert wrote:
>> my terratec card provides very high latencies (more than
>> 40msecs), so I wonder if there are cards out there which are
>> USB 2.0 compliant but can be used on my USB 1.1 machine
>> (until I get a new one) at low latencies.
>> Anyone can tell about such a card? I do not need MIDI ports,
>> but full duplex 2 in 2 out with a mic in and a headphone out
>> would be great. More ins and outs are welcome.
>> Because I'm a hobbyist, the cheaper the better ;-) .
> I am using a tascam us122. Its usb1.1, has two ins and two outs, phantom
> power for the XLR-inputs. It isn't really the cheapest (~200) but worth
> its price.
> I run it successfully with latencies <10ms, even without special
> parameters for the driver.

I'm with a US-224. Also USB1.1. With the nrpacks=1 parameter on the
snd-usb-usx2y driver (alsa-1.0.8+), you can bolt on the "rawusb" mode
jackd alsa backend (jack-0.99.43+) and achieve latencies on the order of
3ms (-p64 -n2). But there's a catch: this only works stable provided you
run a well tunned realtime-preempt patched 2.6.11+ kernel, as the one from
Ingo's :)


rncbc aka Rui Nuno Capela
Received on Mon Jun 13 00:15:10 2005

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