Is it so that the UA-25 should be run in standard mode, not in advanced mode, to function correctly with the snd-usb-audio driver?
Anyhow, I have also tried the standard mode, with fs=44.1kHz. The crackles are still very much present, although less frequent. Asbjørn On Tue, Mar 21, 2006 at 11:55:46AM +0100, Asbjørn Sæbø wrote: > 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
