Doepfer

Hi Martin

either me do not understand what you are asking for, or you do not 
understand that the basic principle of an allpass filter IS the phase 
shift. It is the reason why someone is building an allpass filter.


Or do you mean "phase distortion" as: deviation of the "real (measured) 
phase shift over frequency" from "the ideal phase shift over frequency"?

If the latter is the case: I fear there is no voltage controlled allpass 
filter that suits your (a littlebit academic) requirement. Simply 
because you will not be able to trim 12 variable stages to exactly the 
identical characteristics. You should also obey, that the page you are 
quoting speaks about a static phaseshifter!

 From the musical and sound-engineering approach, this kind of 
phasedistortion is irrelevant.

Florian


martin sörensen schrieb:
> i was hoping for a wider bandwith
> with less phase-distortion
> 
> something like figure 5 in this article
> http://webpages.charter.net/wa1sov/technical/allpass/allpass.html
> 
> 
> /martin