How can I help track this down? It seems that the M-Audio Delta series are among the better supported cards by ALSA, so it would be really nice if their high-end product worked correctly.
Thanks... Aaron Heller
Current system info:
[EMAIL PROTECTED] root]# uname -a
Linux blumlein 2.4.23-1.ll.rh90.ccrma #1 Mon Dec 1 13:13:52 PST 2003 i686 i686 i386 GNU/Linux
[EMAIL PROTECTED] root]# cat /proc/asound/version
Advanced Linux Sound Architecture Driver Version 1.0.0rc1.
Compiled on Dec 2 2003 for kernel 2.4.23-1.ll.rh90.ccrma with versioned symbols.
-------- Original Message -------- Subject: [Alsa-devel] Delta 1010 - noisy analog capture at 96 and 88kHz Date: Tue, 25 Nov 2003 17:53:37 -0800 From: Aaron Heller <[EMAIL PROTECTED]> To: [EMAIL PROTECTED]
A couple of months ago I replaced an M-Audio Delta66 with a Delta1010 (not LT) in my system. The Delta66 works flawlessly. The Delta1010 is OK on playback at all sample rates. Analog capture is OK at 44.1 and 48 kHz sample rates.
However, at 96kHz the noise level on analog capture is very high, about -30dBfs. At 88kHz it drops to about -35dBfs. The audio is clear and undistorted, but sounds as if a pink noise generator is summed in as well. This is not a dropped sample, clicking, stuttering problem. No xruns are reported.
In fact, the problem is audible/measurable by just routing the inputs directly to the outputs with via the on-board mixer/router controlled by envy24control -- no host software (e.g., ecasound, arecord) needs to be running.
I wrote to M-Audio Tech support. They advised me to try it under Windows with their drivers. I did this and it worked flawlessly. I noticed that under Windows when I switched from a high sample rate (88.2 or 96) to a low sample rate (48 or 44.1) or the reverse (low to high) there was a loud click on the audio, as if something was being reset. Switching from low to low or high to high did not produce a click.
Under ALSA no click is heard, just the change in the noise level.
I'm running ALSA 0.9.8 on Planet CCRMA Red Hat 9.
[EMAIL PROTECTED] tmp]# uname -a Linux blumlein 2.4.22-6.ll.rh90 #1 Wed Sep 10 15:43:57 PDT 2003 i686 i686 i386 GNU/Linux
[EMAIL PROTECTED] tmp]# cat /proc/asound/version Advanced Linux Sound Architecture Driver Version 0.9.8. Compiled on Oct 28 2003 for kernel 2.4.22-6.ll.rh90 with versioned symbols.
I've captured audio clips at 44.1, 48, 88.2, 96 and placed them at
http://www.ai.sri.com/ajh/audio/delta-1010-noise/
This directory includes the raw output of board, 12-channels of 32-bit samples, as well as 2-channel 16-bit files of the first two channels, and OGG encoded versions of the last files.
The capture and conversion was done by the script test.csh. I also tar'ed the contents of /proc/asound in proc-asound.tar, the wall paper from that shell is in proc-tar-shell, for reference.
Any help or insight would be greatly appreciated.
Thanks...
Aaron Heller <[EMAIL PROTECTED]> Menlo Park, CA
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