On Wed, 26 Jul 2006, James Courtier-Dutton wrote: > Alfons Adriaensen wrote: >> >> To summarize, aliasing is the result of the _sampled_ nature of a >> digital signal, not of its numerical (digital) form. >> >> > > That is true for your particular example, but aliasing artifacts can be > introduced during digital signal processing. > Most noticeably, when using digital signal processing to resample from a > high sample rate to a lower sample rate.
This is true. But irrelevant in this example discussed in this thread. The "aliasing" here is due to the HIGHLY distored nature of the signal. Such distortion introduces higher harmonics and they are being aliased by the sampling to lower frequencies. Ie, the aliasing is not the problem, the horrendous distortion is. In resampling one should first introduce a sharp cutoff filter to eliminate all frequencies in the orginal above the sampling cutoff of the lower sampling rate. Anyway, the orginal statement is still correct. aliasing is the result of sampling, not digitization. > > > James > > > ------------------------------------------------------------------------- > 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 > -- William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273 Physics&Astronomy | Advanced Research | Fax: +1(604)822-5324 UBC, Vancouver,BC | Program in Cosmology | [EMAIL PROTECTED] Canada V6T 1Z1 | and Gravity | www.theory.physics.ubc.ca/ ------------------------------------------------------------------------- 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
