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Where does this artifact come from?
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sebber



Joined: Aug 27, 2004
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PostPosted: Tue Jan 26, 2016 8:15 am    Post subject: Where does this artifact come from?
Subject description: Aliasing on an analogue synth?
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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


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AlanP



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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.
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sebber



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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?
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ian-s



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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.
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sebber



Joined: Aug 27, 2004
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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.

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