On 2/22/2008 3:47 PM, Jonathan Stowe wrote:
> On Fri, 2008-02-22 at 13:59 +0100, Florian wrote:
>
>> we manage to get "down" to 8 milliseconds buffer size at CD
>> quality without glitches with the onboard soundcard (Intel HDA).
>> However, we would like to use sub-millisecond buffer sizes.
>
> A
On Sat, 23 Feb 2008 16:23:02 +0100
Florian <[EMAIL PROTECTED]> wrote:
> > Because laptops often use SMM traps to poll battery and fan status
> > which can tie up the CPU for several milliseconds.
> >
> > The vast majority of laptops are simply not designed for low latency work.
>
> yeah, that mi
> Because laptops often use SMM traps to poll battery and fan status
> which can tie up the CPU for several milliseconds.
>
> The vast majority of laptops are simply not designed for low latency work.
yeah, that might be a problem we'll have.
Thanks,
Florian
>
> Good luck,
>
> Lee
>
>
--
On Fri, Feb 22, 2008 at 5:55 AM, Florian <[EMAIL PROTECTED]> wrote:
> > But the laptop is not running realtime linux is it? It has
> sure it is...
>
>
> > loads of potential latencies and stuff demanding the system's
> > attention-- page swapping, program swapping, etc. So why would
> > you thi
On Fri, 2008-02-22 at 13:59 +0100, Florian wrote:
> we manage to get "down" to 8 milliseconds buffer size at CD
> quality without glitches with the onboard soundcard (Intel HDA).
> However, we would like to use sub-millisecond buffer sizes.
Any chance you could share your setup for that? I strugg
On 2/22/2008 1:40 PM, James Shatto wrote:
> The USB bus speed probably isn't going to ensure low latency.
> Most USB soundcards seem limited to two channels and 48kHz.
> I'd recommend a PCCard/Cardbus or Firewire device.
yes, I assumed that.
> Is there any reason you're wanting to use something o
> very good sound reproduction) but I certainly have never
> tested its latency. Not sure how you would do so, since your
> ear certainly cannot hear time differences on the level of
> msec.
the beauty (and the whole idea of using real-time audio for
showcasing realtime systems) is that you WILL
> Can anyone recommend a PCCard/Cardbus soundcard, or possibly a
> USB card supported by alsa and which you've been able to run with
> low latency?
The USB bus speed probably isn't going to ensure low latency. Most USB
soundcards seem limited to two channels and 48kHz. I'd recommend a
PCCard/C
On Fri, 22 Feb 2008, Florian wrote:
>> But the laptop is not running realtime linux is it? It has
> sure it is...
>
>> loads of potential latencies and stuff demanding the system's
>> attention-- page swapping, program swapping, etc. So why would
>> you think that it would work on Linux without un
On 2/22/2008 11:55 AM, Florian wrote:
>> But the laptop is not running realtime linux is it? It has
> sure it is...
to clarify: this is not a "full" realtime or embedded linux, it's
Redhat's RHEL 5 with their realtime kernel.
Florian
>> loads of potential latencies and stuff demanding the syste
> But the laptop is not running realtime linux is it? It has
sure it is...
> loads of potential latencies and stuff demanding the system's
> attention-- page swapping, program swapping, etc. So why would
> you think that it would work on Linux without underruns? If
> you wnat 1ms latencies, your c
On Fri, 22 Feb 2008, Florian wrote:
> Hi Bill,
>
> thanks for the replies. Yes, we are doing research on "ultra-low"
> latencies with accompanying realtime Linux and realtime software.
> With good PCI cards, our test synthesizer can run quite stable at
> 8 samples per period (and 2 periods per buf
Hi Bill,
thanks for the replies. Yes, we are doing research on "ultra-low"
latencies with accompanying realtime Linux and realtime software.
With good PCI cards, our test synthesizer can run quite stable at
8 samples per period (and 2 periods per buffer) at 192KHz. Now
for presentations we need to
Hi Andrei,
yes, I know that USB (especially 1.x) may transfer data in time
slices of 1 ms or larger. I don't know exactly about USB 2.0, so
I didn't want to rule it out.
> Myself I tried several solutions, including terratec usb xs
> sound card, and ended with echo indigo io. I think You should
>
22.02.08, 02:42, "Florian" <[EMAIL PROTECTED]>:
> Hi,
> on our IBM/Lenovo T60 laptop, we want higher audio quality than
> the built-in HD-Audio, especially low latency - in the range of 1
> millisecond or lower.
> Can anyone recommend a PCCard/Cardbus soundcard, or possibly a
> USB card sup
On Fri, 22 Feb 2008, Florian wrote:
> Hi,
>
> on our IBM/Lenovo T60 laptop, we want higher audio quality than
> the built-in HD-Audio, especially low latency - in the range of 1
> millisecond or lower.
>
> Can anyone recommend a PCCard/Cardbus soundcard, or possibly a
> USB card supported by alsa
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