| T O P I C R E V I E W |
| ajjbos |
Posted - 07/23/2008 : 04:50:35 AM
Dear ORIGIN users,
I like to determine the 1st derivative of a noisy signal. The diff-smooth, Savitzky-Golay algorithm, even with a large window, produces a very noisy result. Does anyone have experience with this problem?
Thanks in advance
Adrie |
| 4 L A T E S T R E P L I E S (Newest First) |
| Hideo Fujii |
Posted - 07/24/2008 : 3:01:20 PM
I'm not sure if they work or not, you can also try the filters in the File Exchange site:
Median Filter: http://www.originlab.com/FileExchange/details.aspx?fid=83
LPA Interpolation: http://www.originlab.com/FileExchange/details.aspx?fid=132
--Hideo Fujii
OriginLab |
| VincentLiu |
Posted - 07/24/2008 : 05:54:19 AM
Dear Adrie,
We don't know the type of your data and what's the result you want, so could you take some time to send your data through this page. And tell us what you expect to get. Please also paste the following link in your email: http://www.originlab.com/forum/topic.asp?TOPIC_ID=7218.
Best regards,
Vincent
Originlab Technical Services |
| ajjbos |
Posted - 07/24/2008 : 04:53:12 AM
Dear Vincent,
Thanks for the reply. I use OriginPro 7.5 SR6 v7.
The S-G procedure gives better results then the AA smoothing.
The FFT Filter procedures gives very strange results whatever the width of the window (number of points).
Reagards
Adrie
Delft University of Technology |
| VincentLiu |
Posted - 07/24/2008 : 02:52:31 AM
Hi Adrie,
Do you mean you used Diff/Smooth tool in Origin and cannot get a good result? If this is true, you can try other smoothing algorithm in Origin, such as Adjacent-Averaging, FFT Filter. And then you can choose differentiate tool to get the 1st derivative. For we don't know what's version of Origin you use, we cannot give detailed instructions to you. Please state what's version of Origin you use, and then we may provide further help.
Regards,
Vincent
OriginLab Technical Services
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