Haven't had any suggestions on my "VXPocket S24_3LE noise after 30 seconds" problem :(
I need to solve this problem one way or another. If it is likely to be in arecord or in the alsa driver, I will attempt to start debugging the problem. If it is in the VXPocket firmware, is debugging it an option ? Should I be addressing these questions to the Alsa-Dev list ? If a solution appears hopeless, I need a recommendation for an alternate laptop sound card with 24 bit recording ... Thanks again, Scott. On Sun, 2 Nov 2003 13:35:40 -0500 "J. Scott Merritt" <[EMAIL PROTECTED]> wrote: > > Still struggling with this problem, but ran some more tests: > > - I thought it might be a disk access or latency issue; So > I invoked arecord with "nice -n -20" and directed the recording > file to be created on RamDisk - same result - after 30 seconds > the recorded audio file switches to a loud hissing noise for > the remainder of the recording. > > - I also discovered that altering the recording sample rate > slightly changes the symptoms ! Specifically: > > nice -n -20 arecord -D hw:1,0 -c2 -f S24_3LE -r 47950 /tmp/ramdisk/t1.wav > > appears to work correctly for one minute and 28 seconds before > switching over to the loud hissing noise ! The time period 1:28 > also appears repeatable; just like the 30 seconds at 48,000. > > Any suggestions on how further attack this problem would be very > much appreciated. > > Thanks, Scott. > > > On Fri, 31 Oct 2003 20:15:03 -0500 > "J. Scott Merritt" <[EMAIL PROTECTED]> wrote: > > > My VXPocket V2 records perfectly each time at -f S24_3LE > > -c2 -r 48000 for the first 30 seconds. After 30 seconds have > > passed, however, it records only a loud, hissing noise with > > no evidence of the original sound source. > > > > The length of time until noise (30 seconds) seems very > > accurate and repeatable. I've tried this on: > > > > 1. Linux 2.4.22 (with LowLatency) and ALSA 0.9.8 > > 2. RedHat 9 and ALSA 0.9.5 > > > > Same results each time :( > > > > I tried playing the wave file back through the native sound > > device and got the noise after 30 seconds - so it *appears* > > to be a recording/capture problem. > > (Computer is an IBM ThinkPad T40) > > > > If I set the recording format to "dat", it appears to > > record indefinitely (> 3 minutes) with no troubles. > > Unfortunately, I need the 24 bit sampling for an > > urgent college research project. > > > > I will be happy to provide any required data to help > > track this down, but I haven't a clue where to start. > > > > Many thanks, Scott. > > > > > > ------------------------------------------------------- > > This SF.net email is sponsored by: SF.net Giveback Program. > > Does SourceForge.net help you be more productive? Does it > > help you create better code? SHARE THE LOVE, and help us help > > YOU! Click Here: http://sourceforge.net/donate/ > > _______________________________________________ > > Alsa-user mailing list > > [EMAIL PROTECTED] > > https://lists.sourceforge.net/lists/listinfo/alsa-user > > > ------------------------------------------------------- > This SF.net email is sponsored by: SF.net Giveback Program. > Does SourceForge.net help you be more productive? Does it > help you create better code? SHARE THE LOVE, and help us help > YOU! Click Here: http://sourceforge.net/donate/ > _______________________________________________ > Alsa-user mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/alsa-user ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ Alsa-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-user
