[sdiy] Ladder filter variations

[Yves.Usson at imag.fr]

Hi Don

Thanks a lot for these very interesting patents !
It can foresee some long hours of fruitful reading
this week end.

Cheers

Yves


> [Itook the liberty of changing the subject line.]
> 
> Magnus, Hairy Harry, Osamu-san, gentlefolks,
> 
> If you're interested in variations on the ladder filter, I'll suggest
> you go to the patent pdf tool:
> 
>    http://www.pat2pdf.org
> 
> And take a look at this guy:
> 
>   US 6,084,470
>   Filter Circuit Capable of Setting Various Filter Characteristics 
>   Shiramatsu, Nakamura, Goto
>   Kabushiki Kaisha Toshiba
>   July 4, 2000
> 
> This patent is an insane collection of unusual ladder filters.  
> 
> Also check out these:
> 
>   US 5,912,587
>   Active Filter Stack
>   Mihailovits, Beatson
>   Mitel Semiconductor
>   June 15, 1999
> 
>   US 5,225,790
>   Tunable Widband Active Filter
>   Noguchi, Rinaldis, Esling
>   Digital Equipment Corp.
>   July 6, 1993
> 
>   US 3,983,512
>   Current Controlled Electrical Circuits
>   Lipscombe
>   Feedback Instruments Limited
>   September 28, 1976
> 
> I'm sure some of these have significant musical potential.
> 
> Enjoy!
> 
> 
>   -- Don
> 
> -- 
> Don Tillman
> Palo Alto, California
> don at till.com
> http://www.till.com
> 



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