Re: [Alsa-user] Laptop soundcard recommendations?
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 -- Florian Bomers Bome Software --- Music Software, Development Tools: http://www.bome.com Java Sound extensions, plugins: http://www.tritonus.org The Java Sound Resources:http://www.jsresources.org --- Please quote this email in your reply. Thanks! - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Laptop soundcard recommendations?
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 might be a problem we'll have. Thanks, Florian Well, you might consider small form factor PCs then. Regards, Sergei. - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Laptop soundcard recommendations?
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. Any chance you could share your setup for that? I struggle to get below 20ms on my laptop with the HDA soundcard. we use straight-forward ALSA lib in blocking mode, using device hw:0,0. We use 2 periods per buffer -- in that example, each period has 8 milliseconds. I don't know if that should be declared a 16ms buffer, but this configuration only adds 8ms delay (while one period is filled, the other is played). Later, Florian /J\ - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user -- Florian Bomers Bome Software --- Music Software, Development Tools: http://www.bome.com Java Sound extensions, plugins: http://www.tritonus.org The Java Sound Resources:http://www.jsresources.org --- Please quote this email in your reply. Thanks! - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Laptop soundcard recommendations?
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 supported by alsa and which you've been able to run with low latency? I'm not an expert in low latency sound processing, but still should warn you about usb sound cards. It's not that their design cause them to be problematic, but way of connection instead. You have to keep in mind following limitation: a) You'll have to make sure that no 1.1 or 1.0 usb devices resides on the same bus, and this can be problematic, specially with laptops, b) usb as it is may not guarantee you low latency operations since it is essentially designed to provide exclusive access to one device at a time. While one can use usb hubs with switching and buffering capabilities it is still a cumbersome way to connect sound. Myself I tried several solutions, including terratec usb xs sound card, and ended with echo indigo io. I think You should give it a try. At least take a look at it's specs at http://www.echoaudio.com/Products/CardBus/IndigoIO/index.php -- Regards, Andrei - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Laptop soundcard recommendations?
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 give it a try. At least take a look at it's specs at http://www.echoaudio.com/Products/CardBus/IndigoIO/index.php yes, that's exactly what we needed: a positive assertion that this card works fine... :) Thanks, Florian -- Regards, Andrei -- Florian Bomers Bome Software --- Music Software, Development Tools: http://www.bome.com Java Sound extensions, plugins: http://www.tritonus.org The Java Sound Resources:http://www.jsresources.org --- Please quote this email in your reply. Thanks! - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Laptop soundcard recommendations?
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 show that on a laptop... And, btw, our software synthesizer is running on realtime Java :) Thanks, Florian On 2/22/2008 1:48 AM, Bill Unruh wrote: 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 and which you've been able to run with low latency? The usb audio maudio transit I have been quite pleased by, esp now that the alsa has stabilised for this card. Latency it sseems to me is more a matter of the buffer size that is used than anything else. At 1ms you can only have at most 20 samples in the buffer. That runs the danger of underruns, since something could distract the computer for that length of time. Thanks, Florian -- Florian Bomers Bome Software --- Music Software, Development Tools: http://www.bome.com Java Sound extensions, plugins: http://www.tritonus.org The Java Sound Resources:http://www.jsresources.org --- Please quote this email in your reply. Thanks! - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Laptop soundcard recommendations?
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 buffer) at 192KHz. Now for presentations we need to show that on a laptop... And, btw, our software synthesizer is running on realtime Java :) But the laptop is not running realtime linux is it? It has 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 computer must be feading the beast at least every .1ms with no interruptions longer than 1ms. That is not many samples in your buffer. I have no idea if alsa can be made to work that way. Thanks, Florian On 2/22/2008 1:48 AM, Bill Unruh wrote: 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 and which you've been able to run with low latency? The usb audio maudio transit I have been quite pleased by, esp now that the alsa has stabilised for this card. Latency it sseems to me is more a matter of the buffer size that is used than anything else. At 1ms you can only have at most 20 samples in the buffer. That runs the danger of underruns, since something could distract the computer for that length of time. Thanks, Florian -- William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273 PhysicsAstronomy | Advanced Research | Fax: +1(604)822-5324 UBC, Vancouver,BC | Program in Cosmology | [EMAIL PROTECTED] Canada V6T 1Z1 | and Gravity | www.theory.physics.ubc.ca/ - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Laptop soundcard recommendations?
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 computer must be feading the beast at least every .1ms with no interruptions longer than 1ms. That is not many samples in your buffer. I have no idea if alsa can be made to work that way. basically we have that setup working on a workstation, so why shouldn't it work on a laptop? Actually, my collegues here think in guaranteed time slices in the microsecond or even nanosecond range. For them, 1 millisecond is an eternity where A LOT can be done on modern processors :) Later, Florian Thanks, Florian On 2/22/2008 1:48 AM, Bill Unruh wrote: 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 and which you've been able to run with low latency? The usb audio maudio transit I have been quite pleased by, esp now that the alsa has stabilised for this card. Latency it sseems to me is more a matter of the buffer size that is used than anything else. At 1ms you can only have at most 20 samples in the buffer. That runs the danger of underruns, since something could distract the computer for that length of time. Thanks, Florian -- Florian Bomers Bome Software --- Music Software, Development Tools: http://www.bome.com Java Sound extensions, plugins: http://www.tritonus.org The Java Sound Resources:http://www.jsresources.org --- Please quote this email in your reply. Thanks! - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Laptop soundcard recommendations?
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 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 computer must be feading the beast at least every .1ms with no interruptions longer than 1ms. That is not many samples in your buffer. I have no idea if alsa can be made to work that way. basically we have that setup working on a workstation, so why shouldn't it work on a laptop? Actually, my collegues here think in guaranteed time slices in the microsecond or even nanosecond range. For them, 1 millisecond is an eternity where A LOT can be done on modern processors :) Later, Florian Thanks, Florian On 2/22/2008 1:48 AM, Bill Unruh wrote: 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 and which you've been able to run with low latency? The usb audio maudio transit I have been quite pleased by, esp now that the alsa has stabilised for this card. Latency it sseems to me is more a matter of the buffer size that is used than anything else. At 1ms you can only have at most 20 samples in the buffer. That runs the danger of underruns, since something could distract the computer for that length of time. Thanks, Florian -- Florian Bomers Bome Software --- Music Software, Development Tools: http://www.bome.com Java Sound extensions, plugins: http://www.tritonus.org The Java Sound Resources:http://www.jsresources.org --- Please quote this email in your reply. Thanks! - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Laptop soundcard recommendations?
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 underruns? If you wnat 1ms latencies, your computer must be feading the beast at least every .1ms with no interruptions longer than 1ms. That is not many samples in your buffer. I have no idea if alsa can be made to work that way. basically we have that setup working on a workstation, so why shouldn't it work on a laptop? Actually, my collegues here think in guaranteed time slices in the microsecond or even nanosecond range. For them, 1 millisecond is an eternity where A LOT can be done on modern processors :) I agree with that. OK, so you are saying that you believe that the software side is under control-- from the system on up, and you want to know if there exists a card which itself on the hardware side does not itself introduce latencies in the msec range. I suspect few have tested the cards that way, so it may be up to you to do so. As I said I have liked the maudio transit (it is cheap, usb, and has 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. More like 100ms. I suppose you could measure it-- eg a loopback with sound out going right back into the intput, -- or even setting up a feedback loop and seeing what freq it howls at. Never tried it. Later, Florian Thanks, Florian On 2/22/2008 1:48 AM, Bill Unruh wrote: 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 and which you've been able to run with low latency? The usb audio maudio transit I have been quite pleased by, esp now that the alsa has stabilised for this card. Latency it sseems to me is more a matter of the buffer size that is used than anything else. At 1ms you can only have at most 20 samples in the buffer. That runs the danger of underruns, since something could distract the computer for that length of time. Thanks, Florian -- William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273 PhysicsAstronomy | Advanced Research | Fax: +1(604)822-5324 UBC, Vancouver,BC | Program in Cosmology | [EMAIL PROTECTED] Canada V6T 1Z1 | and Gravity | www.theory.physics.ubc.ca/ - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Laptop soundcard recommendations?
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/Cardbus or Firewire device. I also have some M-Audio devices. They sound good and have linux drivers. My Mobile Pre which is USB doesn't sound as good as my Delta 44 which is PCI. But still sounds loads better than the onboard soundcard of my laptop. Is there any reason you're wanting to use something other than the onboard soundcard? Aside from most of them sounding about as low end as one can get. I'm gonna assume that your java is compiled, and not interpreted at run time. And that you've stripped your system down to ensure low latency. No autofs, dbus, avahi, apache, mysql, exim, cups, proftp, cron, atd, portmap, nfs, running while you're making said demo. And that audio has been given realtime permissions at the user level. Plus a low latency kernel. - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Laptop soundcard recommendations?
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 hear if there is an i/o problem anywhere in the path from user app to hardware: even 4 samples missing (i.e. an underrun) will cause a very sharp transient in the outgoing signal, which is audible as a click. You can try that with any ALSA app that lets you set the buffer size to arbitrary values. And, as you suggest, the signal's frequency spectrum will contain very high frequencies, so we've created a tool to automatically detect underruns from the recorded audio output of the soundcard, (and to correlate that with the underruns reported by ALSA). Later, Florian More like 100ms. I suppose you could measure it-- eg a loopback with sound out going right back into the intput, -- or even setting up a feedback loop and seeing what freq it howls at. Never tried it. Later, Florian Thanks, Florian On 2/22/2008 1:48 AM, Bill Unruh wrote: 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 and which you've been able to run with low latency? The usb audio maudio transit I have been quite pleased by, esp now that the alsa has stabilised for this card. Latency it sseems to me is more a matter of the buffer size that is used than anything else. At 1ms you can only have at most 20 samples in the buffer. That runs the danger of underruns, since something could distract the computer for that length of time. Thanks, Florian -- Florian Bomers Bome Software --- Music Software, Development Tools: http://www.bome.com Java Sound extensions, plugins: http://www.tritonus.org The Java Sound Resources:http://www.jsresources.org --- Please quote this email in your reply. Thanks! - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Laptop soundcard recommendations?
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 other than the onboard soundcard? Aside from most of them sounding about 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. as low end as one can get. I'm gonna assume that your java is compiled, and not interpreted at run time. And that you've no, the whole point is that we're running an actual Java VM. Modern VM's don't interprete Java byte code anymore, it's compiled at runtime (JIT) and even dynamically optimized at runtime, which is why Java can be faster than C/C++...(despite what most people believe). But the problem for realtime systems is the garbage collector which normally interferes. The research group I'm working for is developing a VM with a garbage collector that allows realtime behavior of the Java app. An old version of that system is illustrated here: http://domino.research.ibm.com/comm/research_projects.nsf/pages/metronome.harmonicon.html stripped your system down to ensure low latency. No autofs, dbus, avahi, apache, mysql, exim, cups, proftp, cron, atd, portmap, nfs, running while you're making said demo. And that audio has been given realtime permissions at the user level. Plus a low latency kernel. pretty much all of the above :) Thanks, Florian - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user -- Florian Bomers Bome Software --- Music Software, Development Tools: http://www.bome.com Java Sound extensions, plugins: http://www.tritonus.org The Java Sound Resources:http://www.jsresources.org --- Please quote this email in your reply. Thanks! - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Laptop soundcard recommendations?
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 struggle to get below 20ms on my laptop with the HDA soundcard. /J\ - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Laptop soundcard recommendations?
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 think that it would work on Linux without underruns? If you wnat 1ms latencies, your computer must be feading the beast at least every .1ms with no interruptions longer than 1ms. That is not many samples in your buffer. I have no idea if alsa can be made to work that way. basically we have that setup working on a workstation, so why shouldn't it work on a laptop? Actually, my collegues here think in guaranteed time slices in the microsecond or even nanosecond range. For them, 1 millisecond is an eternity where A LOT can be done on modern processors :) 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. Good luck, Lee - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
[Alsa-user] Laptop soundcard recommendations?
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 and which you've been able to run with low latency? Thanks, Florian -- Florian Bomers Bome Software --- Music Software, Development Tools: http://www.bome.com Java Sound extensions, plugins: http://www.tritonus.org The Java Sound Resources:http://www.jsresources.org --- Please quote this email in your reply. Thanks! - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Laptop soundcard recommendations?
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 and which you've been able to run with low latency? The usb audio maudio transit I have been quite pleased by, esp now that the alsa has stabilised for this card. Latency it sseems to me is more a matter of the buffer size that is used than anything else. At 1ms you can only have at most 20 samples in the buffer. That runs the danger of underruns, since something could distract the computer for that length of time. Thanks, Florian -- William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273 PhysicsAstronomy | Advanced Research | Fax: +1(604)822-5324 UBC, Vancouver,BC | Program in Cosmology | [EMAIL PROTECTED] Canada V6T 1Z1 | and Gravity | www.theory.physics.ubc.ca/ - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
