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Kai Klaas
11/16/05 09:24
Read: 907 times
Germany


 
#103808 - Agreed
Responding to: Frieder Ferlemann's previous message
Frieder said:
Median filter is very adequate to sort out individual misreadings, where a linear filter (like averaging) will have its problems.

Of course! But how to find out what is an "individual misreading" and what comes from strong periodic interference? This can only be interpreted when doing some statistics. But for this you need a large number of samples. Then you can try to fit a Gaussian curve and then you can better see, what seems to be a real individual misreading, what seems to be a periodic interference and what seems to be statistic noise.

Each methode has its pros and cons. The mess is to find out, what is suited and what's not. And in our application removing certain samples was the wrong way to deal with a signal that was superimposed by a relevant periodic interference. That's the only thing I wanted to mention.

Regards,
Kai

List of 16 messages in thread
TopicAuthorDate
Weight Scale Avarging method      Thakkar Bhaskar      11/12/05 02:20      
   Filter providing two time constants      Kai Klaas      11/12/05 07:31      
      median filter, simulate algo on PC      Frieder Ferlemann      11/12/05 07:47      
         Periodic interference can make them fail      Kai Klaas      11/15/05 08:32      
            Acknowlegded.      Frieder Ferlemann      11/16/05 08:24      
               Agreed      Kai Klaas      11/16/05 09:24      
                  50Hz sampling      David Smith      11/17/05 03:54      
                     Anti-aliasing filter will help      Kai Klaas      11/21/05 06:27      
                        what this is all about      Erik Malund      11/21/05 06:37      
   Moving average window.      Graham Cole      11/14/05 01:50      
      Average on condition      Kai Klaas      11/15/05 07:29      
         is that not SOP (standard operating proc      Erik Malund      11/15/05 07:41      
            Hallelujah!      Kai Klaas      11/15/05 07:55      
   meaningless      Erik Malund      11/14/05 06:34      
   What are you using that one for in a wei      Erik Malund      11/14/05 09:14      
   hello from chhatraliamd for weight scale      Chhatralia Mansukhbhai Dh      12/27/05 01:01      

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