Bode Shifter: How does it work?

This is the place to share tips, tricks and questions about Moog's controller products; the MP-201 Multi-Pedal and the EP-2. There are a world of applications for these expression enhancers. Explore...
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captainsiberia
Posts: 3
Joined: Wed Jan 05, 2011 12:57 pm

Bode Shifter: How does it work?

Post by captainsiberia » Wed Jan 05, 2011 1:03 pm

I have Arturia's Moog Modular, and it includes the Bode Shifter. It's the strangest module in the bunch. Just playing with it, I couldn't fully grasp what it was doing. I did a little research, and it seems that it shifts all audio tones not by an equal percent but by an equal number of Hertz, and it appears that when you combine the A and B channels in equal proportion, you essentially have a ring modulator. What I want to know is, how does it work? How does a module raise all tones by an equal number of Hertz? Because I'm thinking it's witchcraft.

og.
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Joined: Fri Jan 14, 2011 1:37 am
Location: FRANCE
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Re: Bode Shifter: How does it work?

Post by og. » Fri Jan 14, 2011 2:00 am

depending of the settings you can create some ring mod , harmonizer , phazer effetcs
it's possible to shift only certains freq in a sound keep intact some others
please see some examples on my youtube :
http://www.youtube.com/user/polyvoks#p/u/8/c5A5FnsDfNs

JES
Posts: 14
Joined: Wed Aug 18, 2010 8:37 am

Re: Bode Shifter: How does it work?

Post by JES » Fri Jan 14, 2011 7:51 pm

A free bode-style shifter in software form so you can play around with it and see what it does:

http://valhalladsp.com/freqecho.html

Now where can I get me an analog bode shifter?

captainsiberia
Posts: 3
Joined: Wed Jan 05, 2011 12:57 pm

Re: Bode Shifter: How does it work?

Post by captainsiberia » Sun Jan 16, 2011 2:09 am

But I said at the very beginning that I have Arturia's Moog Modular. i can play around with the Bode shifter to my heart's content. I still have a little difficulty getting a grip on what it technically does. And I want to know how the technology works. What's the math? How does the analog circuitry work? I mean, a ring modulator is kinda easy. It's the same principle as tremolo. You're multiplying one wave by another. But what is the underlying principle with the Bode shifter?

narrowcaster
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Joined: Mon Jul 09, 2007 11:57 am

Re: Bode Shifter: How does it work?

Post by narrowcaster » Sun Jan 16, 2011 7:40 am

Well, I have no idea how it works, but it must have something to do with Bode plots. And since these are a way of representing relationships between frequency and phase, maybe it does some kind of phase shifting on individual frequency components?

c7sus
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Joined: Sun Aug 14, 2005 5:42 pm

Re: Bode Shifter: How does it work?

Post by c7sus » Sun Jan 16, 2011 8:19 pm

It's witchcraft.
Voyager EB #165, T3 #292, MF-101, 102, 103, 104SD, 2x104MSD, 105M, 107, 108M, MP-201, VX-351, CP-251, Frostwave Fat Controller.

captainsiberia
Posts: 3
Joined: Wed Jan 05, 2011 12:57 pm

Re: Bode Shifter: How does it work?

Post by captainsiberia » Mon Jan 17, 2011 2:00 pm

c7sus wrote:It's witchcraft.
Knew it!

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