Chris Metzler wrote: > Yeah, this was one of the questions I meant to ask, and forgot -- > whether there are PCIe options. AFAIK the only PCIe sound chips are made by Creative (consumer cards, no good Linux support). It is possible to put a PCIe/PCI bridge chip on a card, but the only vendors that do are ESI and Asus. ESI uses Tenor chips, which aren't supported at all; Asus Xonar cards are useful only if you do not need more than one stereo consumer-level line input (but then they have very good ADCs; see <http://www.alsa-project.org/~clemens/xonar-models.html>). > Clemens Ladisch <clemens@xxxxxxxxxx> wrote: >> Chris Metzler wrote: >>> - 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. > > 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? Maybe. Usually, there are just too many onboard devices. >> 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. > > 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? No, two channels. The limits are 512000 bytes/s per direction full duplex or 1023000 bytes/s half duplex. Mono would be possible, but I don't know of any such device. Regards, Clemens _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
