digital artifact

May 6, 2013 at 11:36am

digital artifact

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?

wav file: https://dl.dropboxusercontent.com/u/1276843/HiFreQ.wav

Kevin

[attachment=222859,5546]

Attachments:
  1. hiFreq.jpg
#68076
May 6, 2013 at 12:33pm

Probably a difference tone?

Not so much a digital artifact as simple physics. < http://en.wikipedia.org/wiki/Difference_tone>.

#244555
May 6, 2013 at 6:31pm

Might also have something to do with aliasing.
[cycle~] is not alias-free. At least it used to be, back in the days…

#244556
May 6, 2013 at 6:42pm

But wait…if it was aliasing it should show up in the spectrum analyzer, right?

#244557
May 6, 2013 at 7:03pm

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?

#244558
May 6, 2013 at 8:11pm

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

#244559
May 6, 2013 at 8:13pm

Could also be a combination of d/a artifacts, aliasing, difference tones and the harmonic distortion of your ear ;)

#244560

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