Median Filter code snip from old post 13211

[Peter]

Hello All,

I'm looking for a median filter code. A search shows that post 13211 has what I need but the post is no longer avaliable.

Does anyone know how to look at the old Forum or have a code snip that they can share with the forum?

Thanks in advance for your help.

Peter


http://www.pic-c.com/forum/general/posts/13211.html

[hp]

Hello,

You can do a search on the Forum for Post 13211. The search turned up: http://www.ccsinfo.com/forum/viewtopic.php?t=3462 which looks like the post you wanted.

Harrison

[Neutone]

This works really well for a signal that is being measured on a regular basis. This results in a signal thats filtered much like an RC circuit. In an RC circuit one time constant gets you to reach ~66% of the full scale value and ~5 time constants gives you the final value. Using this formula each sample is like a time constant that gives you 1/x of the stable value where x is the number of shifts in the subtraction operation. The number of samaples required to reach a stable value is dependant on the number of shifts.