Herbie:

>first I must tell you that I don't have any code for Wiener filtering.

That's Okay.

>When I did Wiener filtering (named after Norbert Wiener, a mathematician at
>the MIT who became famous for his work in statistics and control theory as
>well as the founder of an interesting but later misused field called
>cybernetics) I was using a quite unusual technique, namely coherent optical
>analog computing which actually realizes linear filters in the Fourier Domain.
>With this technique the analog FT is the diffraction pattern of the image or
>signal to be processed. A nice but not very flexible technique that doesn't
>suffer from the shortcomings of the discrete FT approaches such as FFT (the
>windowing problem was mentioned recently, but there are many more problems
>such as aliasing)!

United Geophysical Corporation, which I worked for back in the 1970's 
did a lot of optical processing. They had to because it was before 
digital.

>Second, I'm not quite sure whether I would use the term tapper with respect to
>Wiener filters, because they must be tailored according to the _spectral_
>noise power that is present in the signals to be processed...

The Wiener filter, as I knew it, was a filter for making the slopes 
of the band pass filter less susceptible to frequency problems 
(inducing higher order freq).

>Third, and this is not at all addressed to Tedd:
>I apologize for anything I've done wrong to the list recently and my apologies
>for this off-topic post. Please would everybody who became annoyed by my
>recent posts tell me that _offlist_ in a clear-cut fashion so that I can
>change my bad habits.

Bad habits? I thought bad habits was a requirement for this list.

>Best to all of you and thanks for your question Tedd.

Hey, questions are a display of ignorance and I do it best.

tedd

-- 
http://sperling.com