[sdiy] new to the list... already have a question :)

[Magnus Danielson]

From: Robert Pietrusko <bobby at csounds.com>
Subject: [sdiy] new to the list... already have a question :)
Date: Mon, 29 Dec 2003 19:10:33 -0800 (PST)
Message-ID: <20031230031033.93100.qmail at web41305.mail.yahoo.com>

> Hi List,

Hi Bobby,

> I'm curious if anyone on the list has experience
> designing Boctor High Pass Notch circuits using the
> Gioffi equations.  
> 
> I'm working on a 10th order Cauer filter design (split
> into second-order-sections which will be designed as
> cascaded high-pass notches) and for all but the first
> section I am getting negative values for my Rs and Cs!
> There is an inequality involving Q, Wz and Wo that my
> coefficients are violating, so I'm sure this has
> something to do with it.
> 
> Does anyone know of a workaround? I really need this
> high-pass notch response for my filter (i think) and
> I've been wrestling with it all day.
> 
> Thanks in advance for any help you can offer.

Well, excuse me for my ignorance, but do you happend to have a reference (or
several) to the Boctor/Gioffi material, which I haven't heard about.

Might I assume you are doing something in Csound or is this a discrete design?
Additional details like that might help you know.

Cheers,
Magnus