[DUG] Chart Smoothing

[Marshland Engineering]

I'm reading a noisy signal and need to filter the data. I've tried many home
grown techniques but none are any good enough. 

Here is a sample of the data. I'm working on acceleration which is the rate of
change of speed. The change of speed between samples (30hz) is quite small so
the result is quite noisy as you can see.

http://www.marshland.co.nz/ftp/Delphi/Plot.jpg

Anyone found something that I can use ? 

Thanks Wallace