How to get the phase values of harmonic component numerically?
Hi,
Basically what i am trying to do is to analyze the quality of acquired waveforms. What i am interested are both magnitude and phase at some certain frequencies (say 50Hz, 150Hz, 250Hz etc) of a waveform. I tried to use 'spectral measurment express VI' to achieve my goals. It works well, but so far i can only manage to show the spectrums in the graphs. Then , i tried to use 'harmonic distortion Vi' to get the magnitudes of different harmonic components numerically and it is absolutely fine. My question is that how i can get the phase of different harmonic components numerically?
Many Thanks
Hao
Solved!
Go to Solution.
FFT plus some manipulation of the outputs seems to work fairly well.
I used Tones and Noise Waveform.vi to generate a test signal. The FFT Spectrum (Mag-Phase).vi analyzes the signal. I find the magnitude peaks and extract the phases at those locations. The results are quite close to the input values even when the noise is larger than some of the harmonics.
Lynn
Attachments:
Phase tester.vi 16 KB
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Now try to do the load.
OR
If you did customization your cube, make sure you did activated your cube, did the changes in your DS, replicated datasource in BW, added the new fields in TR and activated, and Deleted your UR and re-created it.
Now try.
Hope it helps.. -
hi
i am new to programming... i would like to know how to get the column values... i have a resultset object
i need code .... asap
thnx@OP: It is always good to type complete sentences and describe your problem at length. It helps in letting people know what you really need instead of making wild guesses or silly jokes. You post mentions that you get the ResultSet. Then you should look up the API docs for java.sql.ResultSet and take a look at the getxxx() method signatures. Use the ones which suit the specific case.
Besides, it is good to refrain from using asap and urgent. Even if something is urgent to you, it need not be urgent to others. Wording a question properly would attract better replies.
Finally, would you mind getting down to specifics of your problem? From what I perceived, the JDBC tutorial and the API docs should provide all the information you need.
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