[sdiy] Phase distortion free analogue filter.

[Senso]

Just stumbled upon this one:

http://www.freepatentsonline.com/4096576.html

Now it's just a bit beyond my technical know how and it's late here, 
so I don't have the concentration and patience to educate myself by 
reading it seven times, but some here might find it interesting. ;-)

Senso


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