[sdiy] Re: moog high pass

[jhaible at debitel.net]

Adding an inverted input signal will only give a HP response
with no resonance. If you have resonance, odd things will happen,
(nice things, even), but you won't get a HPF with resonance
that way. (But then again the old Moog Modular HPF didn't have
resonance either, did it?)

JH.



Zitat von Paul Perry <pfperry at melbpc.org.au>:

> At 11:48 AM 30/07/03 +0200, Theo H wrote:
> >- The production model Voyager has HP, earlier prototype had not.
> > -Simple as in adding inverted LP filter output to input signal to get HP.
> >Takes about one opamp and 3 resistors.
> >
> 
> Is it really that simple?
> Granted, you would get a low pass filter this way.
> But, I doubt it would sound anything like, for example, the 
> patented Moog ladder high pass.
> Because, the artifacts would be completely unalike.
> In an ideal, distortion free, filter, then I agree.
> 
> paul perry (Melbourne Australia)
> 
> 
> 




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