[sdiy] A-Curve transfer function

[M.A. Koot]

Hi everyone,

I have a little question about frequency weighting. While I'm still working
on my RTA-Project, I have to include this. I can't use any third-octave band
filters in front of this A-filter, so I can't just add up some dB's to
allready filtered signals. 
So I have to design this filter to have a (near) perfect A-curve, and I was
wondering if anyone maby allready would know the transfer function for this
filter. It's a pretty much used accoustical filter, and most guys here know
a lot about accoustics I believe. Is there anyone who might be able to help
me out with this?

Thanks a lot!
Michiel

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