 |
Korg Forums
A forum for Korg product users and musicians around the world.
Moderated Independently.
Owned by Irish Acts Recording Studio & hosted by KORG USA
|
| View previous topic :: View next topic |
| Author |
Message |
CharlesFerraro
Platinum Member
Joined: 06 Feb 2010
Posts: 955
Location: California
|
 Posted: Sat Jun 02, 2018 3:53 am Post subject: |
 |
|
Hmm... looks like the original images were taken down from "postimages.org", that's a shame. Assumed that site would host images permanently. Anyone know if there's a way to upload to korgforums directly instead of through a third party? This means I have to recreate every image.
| danatkorg wrote: | My general recipe for testing a digital synth's oscillators for audible aliasing is this:
1. Turn off all effects, and bypass the filters (or set the cutoff fully open). Turn off any distortion, including filter or amp "drive" if present. For now, also turn off sync, ring mod, and FM.
2. Solo a single oscillator, set it to a sawtooth waveform, and turn the frequency up as high as it will go.
Then...
3. Test A: play a chromatic scale in the top octave of the keyboard. If you hear a second, randomly-pitched lower scale as well - that's aliasing.
4. Test B: Hold a note, and move the pitch-bend wheel, lever, or joystick. If you hear extra pitches, or pitched noise that sounds like tuning a short-wave radio - that's aliasing.
5. Test C: Turn on sync, and create a typical swept sync sound. Now, try tests A and B again.
Note that with current technology, *all* digital oscillators alias to some degree. The question is to what extent the aliasing is audible, and which features include anti-aliasing measures. For instance, a synth might have basic oscillators with very good anti-aliasing characteristics, but then exhibit significant aliasing when sync is enabled.
- Dan |
At least I can try out this test between AL-1 and MPowerSynth if I redo all of these. I'm pretty sure Charlie and Andy own a patent on anti-aliasing and it's integration with oscillator sync, right? Pretty sure I got that information from Will Pirkle's book, I remember reading about how their bandlimited step functions (BLEPs) were quite a feat. Betting MPowerSynth won't be as crystalline when it comes to oscillator sync.
_________________
paypal.me/CharlesFerraro |
|
| Back to top |
|
 |
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
