On Wed, 26 Jul 2006, Alfons Adriaensen wrote: > On Wed, Jul 26, 2006 at 08:05:03AM -0700, Bill Unruh wrote: > >> I am afraid that I no longer have the original message. >> Did you post the spectograms somewhere? > > I didn't - Thomas did: > > http://homepage.ntlworld.com/jonahood/drc/
There is so so so much distortion in that signal, I have no idea what you are seeing as aliasing. Remember that a strongly clipped signal has frequencies of x 2x 3x 4x ... and when those are digitized they will get aliased as they go above 21KHz. Is that what you are seeing? No analog filter is a step function cutoff, so those signals will get through to the digitizer and will be aliased. Ie, I see this as a simply example of extreme distortion, probably clipping distortion in the analog stages of the soundcard (the fact that the odd harmonics are stronger than the even also makes me think this is just clipping distortion with some aliasing of the clipping products.) . > > > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
