Doepfer

btw, here is my idea (not bright or new, sorry ...):
 
a new high quality Doepfer A100 frequency shifter module with a much wider frequency range of its internal carrier than the a126!
 
i really want that.
 
so, Dieter, is that in the planning stage, or should i create a poll for it?
 


Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
[Doepfer_a100] group owner
www. parallel - worlds - music. com
www. myspace. com/ parallelworldsmusic
www. myspace. com/ interconnectedmusic
www. myspace. com/ memorygeist
www. DiN. org. uk
www. musicamaximamagnetica. com
www. shimarecords. co. uk
www. rubberrecords. gr
Athens - Greece

--- On Wed, 10/29/08, yahoo@doepfer.de <yahoo@doepfer.de> wrote:

From: yahoo@doepfer.de <yahoo@doepfer.de>
Subject: AW: [Doepfer_a100] Let me hear your bright new ideas for future Doepfer A100 modules!
To: Doepfer_a100@yahoogroups.com
Date: Wednesday, October 29, 2008, 3:48 PM






> hello,
>
> i'm sure this is achievable with existing modules, if it is could
> someone explain how (four phase shifters?), but the other day I
> decided that I could do with a module in which you can input a
> waveform audio or cv and have seperate outputs in 90 deg/180/270
> deg etc phases.like the quadrature modules which exist but from
> an input rather than internal occillators.
> a quad-phase shifter i suppose? using four seperate phase
> shifters-would you be able to set them accurately enough?
> diy'ers-would this be simple enough to knock up? i'm no engineer
> but i can solder things together ok. sounds simple to me....but
> then lots of things do that aren't. :(

A 90 degree phase shift over a wide frequency range is not easy to realize
because the phase shift of a normal phase shifter is not constant over the
frequency but depends upon the frequency! It's the function of the dome
filters in the (obsolete) A-126 frequency shifter. In the A-126 we used a
12-stage allpass filter to approximate a 90 degrees phase shift in the
frequency range 6 Hz ... 12 kHz with +/-2 degrees error. It's very difficult
to adjust a dome filter as the phase shift of each all pass affects the
others too. It took more than 30 minutes to adjust the dome filter of the
A-126.

180 and 270 degrees can be achieved by intverting the signal (180) or the 90
degree signal (270).

Best wishes
Dieter Doepfer

 














      

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