(Posted last night but did not show up on the list?? - reposting)

As i believe my filter need some explanation, i send a cpoy of my answer of
a question from Stefan also to the list:

At 13:15 1998-11-06 +0100, Stefan Sczekalla-Waldschmidt wrote:
>Hi Morgan, 
>
>while I understod how your filter works as a matter of principle, where
>are the 
>new values injected ? directly below or above the middle values or
>between the
>adjacent values next to the injected ?

Between the two by value most close positions :

The filter holds a range of values:
( 6 pos in this example; 16 in posted code )

A  -TOP
B
C
D
E
F  -BOTTOM

where A =< B =< C =< D etc...

The first thing th efilter do when called, is to compare the feed with the
values in the array.  The array is always sorted.
For fastest performance the code compares the MSB untill they are close,
then LSB.

When you call feed the filter with NEW value C < NEW < B, it will be
injected below B and C.  As the value is higher then the majority of stored
values (position is above middle of array), the filter decides that it is
the lowest value in filter that shall be treshed.

So, it shifts:
E -> F  (F get trashed)
D -> E
C -> D
NEW -> C

The result:
A  -TOP
B
NEW
C
D
E  -BOTTOM

The operation is vice versa for feeds below array midpoint.

Note that the stored values will always be sorted by value.

After sorting it takes the average of the middle values in the array
Here:   ( NEW + C ) / 2  -> result

What i did not mention before is that this filter also can give a good
measure of the noise level by adding all values above middle and
subtraction with all values below.

>By the way reading swedish is well - call it a exercise for your
>imagination - it�s sometimes funny-different or similar and requires
>sometimes a lot of imagiantion - well and some words will stay
>unrecognised from point of view of a german.
>
>I tryed to figure the coment�s out yesterday evening.

 Wow! :)

>Did you use plain swedish or did you concatenate abbreviatons ?

Mixture of swedish and english words (in labels) concatenated and mixed
together in a wonderful blend ;)

>What is the meaning of "om" 

=if ; german is closer: ob

>did "som" means something like engl. "some [of]"

NO.  "som" = which [will/is] or something like that 
it can also mean as; like as, or german: "wie" 

Good luck with your language lesson :)
/Morgan

>Thanks a lot for posting the code.

Posting is easy.
To explain what i have done is another matter.  ;)
Good exercise too.
/Morgan

>Kind regards and good luck with your project,
>
>       Stefan Sczekalla-Waldschmidt
>       ssw@oikossw.de

        Morgan Olsson                   ph  +46(0)414 70741
        MORGANS REGLERTEKNIK            fax +46(0)414 70331
        H�LLEK�S           (in A-Z letters: "HALLEKAS")
        SE-277 35 KIVIK, SWEDEN               mrt@iname.com
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