When playing back audio on an Edirol UA-25 usb sound device, I am getting "crackling" sound (not unlike playing an old LP).
The crackles occur frequently, on average about twice or more per second. They typically come in bursts, in between the series of crackles, there may be a second or two without any. I have tried quite a few combinations of parameters without getting rid of this crackling. The current situation is as follows: * The device is set to advanced mode (otherwise, the sample rate is fixed to 44.1kHz according to the manual) * The sampling frequency switch of the device is set to 48kHz (which, as far as I have heard, is better than 44.1kHz for usb devices) * /proc/asound/card0/stream0 reports an EDIROL UA-25, with a "Momentary freq" of 48kHz * The audio is a wave file (a 500Hz sine) at 48kHz sampling frequency (which plays back just fine at another system). I get crackles both when playing back using ALSA directly (using aplay or xmms) and when playing back via JACK (using xmms). When using jack, I may get one or two xruns, which is far, far less than the number of crackles. How do I get playback without these crackles? The system is an ASUS L5000-series laptop, with DeMuDi 1.3.0rc1 installed. The kernel is 2.6.14 (2.6.14-1-multimedia-386), alsa is 1.0.10 (according to /proc/asound/version). With kind regards Asbjørn Sæbø ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid0944&bid$1720&dat1642 _______________________________________________ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
