digital artifact

    May 06 2013 | 11:36 am
    Could somebody describe me what's happening when i play this file? I'm trying to add 2 high frequency Cycle~ signals... There are 2 HighFreq -6dB signals there (above the average hearing limits)... sometimes one is played alone sometimes the other... all good, can't hear anything... But when the 2 signals are added, then there is some digial artifact i can hear on a lower frequency... What is strange as i can't see that on a spectrum analizer...
    Do you hear that artifact too? Any ideas how to get rid of it?

    • May 06 2013 | 12:33 pm
      Probably a difference tone?
      Not so much a digital artifact as simple physics. .
    • May 06 2013 | 6:31 pm
      Might also have something to do with aliasing. [cycle~] is not alias-free. At least it used to be, back in the days...
    • May 06 2013 | 6:42 pm
      But wait...if it was aliasing it should show up in the spectrum analyzer, right?
    • May 06 2013 | 7:03 pm
      yeah, i was thinking maybe it can be some kind of harmonic distrotion on the D/A converter?
      really strange...
      btw, do you hear any sounds if you check the file?
    • May 06 2013 | 8:11 pm
      I'm hearing high pitched (>2khz) chirp like bursts. Using a really cheap onboard sound card.
      If you substract the frequencies of the two cycles~ and compare it to the frequency you hear you can tell if it is the difference tone.
      Because of the chirp like sound i suspected aliasing
    • May 06 2013 | 8:13 pm
      Could also be a combination of d/a artifacts, aliasing, difference tones and the harmonic distortion of your ear ;)