[LAU] Re: real time Grahic EQ

* Fons Adriaensen <[email protected]> [2025-04-25 12:24]:
> On Fri, Apr 25, 2025 at 11:22:34AM +0200, Peter P. wrote:
> 
> > I suppose, its parameters can not be stored to/read from a (text)file or
> > are otherwise storable?
> 
> Not in this release. I wanted for a long time to create a common 
> preset/memory system for all the zita-* stuff, but that never 
> happened. See the small rectangle just below the zita logo ?
> This is where the button opening the presets dialog will go...
Awesome! Yes, this will be a great addition, as will be a command line
flag to read from such a preset file.
 
> > > The shelf sections have a variable slope. When this is set above
> > > 2/3 of the range, the gain will first go in the opposite direction
> > > before going up or down to the set gain. This was a feature of some
> > > of the most famous analog equalisers.
> > Does this mean there will be a resonance peak?
> 
> See <http://kokkinizita.linuxaudio.org/linuxaudio/shelf2filt.html>
> 
> There is a peak but in the opposite direction of the shelf. This
> enhances the difference between the 'shelved' part and region just
> before it.
> 
> > I wonder which analog EQs used this
> 
> IIR correctly, the EQ in some of the big SSL consoles had this.
> 
> > and if its users were aware of this feature at all....
> 
> Some probably were. But in those times, no sound engineer worth
> his title needed a graphical display of the EQ response. We just
> *listened* ...
Thanks for the extra info! I wonder if this peak was/is perceived as
pleasant, or if it helps finding the cutoff frequency. Possiby noone has
published anything about this.

best, P
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