RBJ peaking filter -- off by 2 X

Jon> What are the Orfanidis and Christianson improvements?  Are they
Jon> published somewhere?

If this is indeed the guy I think it is, then it is Christensen not
Christianson. I don't know what he did, though.

-- 
/Mads (http://kom.auc.dk/~mgc)

In article ubrrfsuov.fsf@nospam.ieee.org, Mads G. Christensen at
christensen@nospam.ieee.org wrote on 11/13/2003 18:41:

> 
> Jon> What are the Orfanidis and Christianson improvements?  Are they
> Jon> published somewhere?

check

http://cnmat.cnmat.berkeley.edu/~tristan/Resume/parameq.html

there was one assumption of the peaking EQ that i made that probably wasn't
valid (that the gain at Nyquist would be 0 dB).  Orfanidis fixes that a
little and comes up with much more complicated coefficient calculation
equations.

> If this is indeed the guy I think it is, then it is Christensen not
> Christianson. I don't know what he did, though.

well, if i knew how to spell, i wouldn't be an engunear.

Knud gave a poster session presentation at the last AES in NYC entitled "A
Generalization of the Biquadratic Parametric Equalizer".  It adds a symmetry
parameter that can, with the single twist of a knob, morph a high-shelf EQ
into a symmetrical peaking EQ, and into a low-shelf EQ.  howzat?

r b-j