> Hi. The only solution I saw to this problem was in a HOW-TO that a guy posted. > Sadly I can't find it, but it was a soldering iron job on the soundcards.
Right here: http://www.djcj.org/LAU/quicktoots/toots/el-cheapo/ You're just running both devices off the same crystal. That's certainly one way to do it, but wouldn't work with devices that use different circuits or crystals, and I don't think it can be extended to more than 2 or 3 cards. I don't think there's any reason that we can't do something similar inside the computer, as long as we have information about the timing of each crystal (like the speed at which the buffers fill up, the points in time that the device interrupts the main processor, etc.) It's just a lot of work to design. I'm pretty sure this is already done in some systems, actually. The resampling speeds of each card *would* drift a little, so it wouldn't be perfect at first glance, but the only reason you're doing that is because the actual crystals drift by the same amount, so you're not really losing anything. > Perhaps we should just pressure folks such as Creative to think > about this. For pro audio systems, they already have hardware connections like this, called "wordclock" connections. > Alright. they are just in it for the bucks, but the more cards > they sell the better for them, and if this facility is there they are likely > to sell more cards to Linux users wanting to use multiple cards all in sync. You could always ask them to add jumpers or at least traces and pads to the boards, though, for easier hardware manipulation. That kind of modification is quite cheap, and if they'd sell more boards, they'd do it. I know some of the boards I design have jumpers and such on them for easy modification, as there are a handful of people out there who want it to function differently, even though it's not something end users typically know about. ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_idv37&alloc_id865&op=click _______________________________________________ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
