electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Articles  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links  |  Store
Forum with support of Syndicator RSS
 FAQFAQ   CalendarCalendar   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   LinksLinks
 RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in  Chat RoomChat Room 
 Forum index » Instruments and Equipment » General Discussion
Where does this artifact come from?
Post new topic   Reply to topic
Page 1 of 1 [5 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
sebber



Joined: Aug 27, 2004
Posts: 499
Location: Berlin
Audio files: 3
G2 patch files: 33

PostPosted: Tue Jan 26, 2016 8:15 am    Post subject: Where does this artifact come from?
Subject description: Aliasing on an analogue synth?
Reply with quote  Mark this post and the followings unread

Hi everybody,

here's a five second recording of a Korg Arp Odyssey. The filters are wide open and I'm using only a single sawtooth wave. Playing the highest note on the keyboard and with the frequency all the way up the pitch is above hearing range and only appears at the end of the recording. However, I hear something that reminds me of aliasing. The recording is done with 96kHz, however, I hear the same thing with my headphones plugged directly into the Kordyssey and all other cables detached (just in case).

What is this? I thought analogue synths don't know aliasing? The artifact keeps on appearing for quite a while until the oscillator is well into hearing range. Is it my headphones?

Thanks for your enlightement
Sebastian


Arp Artifact.wav
 Description:

Download
 Filename:  Arp Artifact.wav
 Filesize:  957.87 KB
 Downloaded:  510 Time(s)


_________________
Fish don't swim. They dive.
For everything else: The Patcher's Toolbox
Back to top
View user's profile Send private message Visit poster's website
AlanP



Joined: Mar 11, 2014
Posts: 722
Location: New Zealand
Audio files: 40

PostPosted: Tue Jan 26, 2016 10:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

If you've got an oscilloscope, I'd suggest seeing if you can see anything on that.
Back to top
View user's profile Send private message
sebber



Joined: Aug 27, 2004
Posts: 499
Location: Berlin
Audio files: 3
G2 patch files: 33

PostPosted: Wed Jan 27, 2016 6:49 am    Post subject: Reply with quote  Mark this post and the followings unread

Well, I can hear something so I guess I would see something. I don't know much about the use of oscilloscopes other that they show me the waveform. How would I use the oscilloscope to give me more information about where those artifacts come from?
_________________
Fish don't swim. They dive.
For everything else: The Patcher's Toolbox
Back to top
View user's profile Send private message Visit poster's website
ian-s



Joined: Apr 01, 2004
Posts: 2666
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 626

PostPosted: Thu Jan 28, 2016 11:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

It reminds me of heterodyne more than aliasing. Perhaps the vhf oscillator and the other oscillator are being mixed in the cmos ring modulator and there is a little bleed through. Bleed through is something analogue knows a lot about.

If it is the ring mod, you will also be able to change the whistle pitch when you adjust the frequency of the other oscillator.

I tried a Korg Odyssey in a shop Yesterday to see if the PPC was the same as I remembered. I was disappointed. If anything it is a little softer than the ARP version (a good thing) but it has a big dead band. You have to dig in a lot before the pitch starts to move at all. The original had a very organic response, more like bending a string.

It is a sweet sounding synth though.

Sorry to hijack your post.
Back to top
View user's profile Send private message
sebber



Joined: Aug 27, 2004
Posts: 499
Location: Berlin
Audio files: 3
G2 patch files: 33

PostPosted: Thu Feb 04, 2016 10:17 am    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, I guess I was just recording a side band or some bleed through.

Using the ring modulator with very high pitches you get something that sounds exactly like aliasing, however, it's just the sidebands playing with each other.

I like the Odyssey a lot, I must say. One of the best sounding synths I ever had and the first time I was really convinced that the old machines have something some of the newer ones don't have. And I'm even talking about a replica of an old synth and it just sounded sweet.

My guess is that the PPCs will feel different after half a year using them. Takes some getting used to, though.

Thanks for the input everybody.

_________________
Fish don't swim. They dive.
For everything else: The Patcher's Toolbox
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic
Page 1 of 1 [5 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
 Forum index » Instruments and Equipment » General Discussion
Jump to:  

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
You cannot attach files in this forum
You can download files in this forum


Forum with support of Syndicator RSS
Powered by phpBB © 2001, 2005 phpBB Group
Copyright © 2003 through 2009 by electro-music.com - Conditions Of Use