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Issues with Time-frequency spectral analysis
- This topic has 6 replies, 2 voices, and was last updated 13 years, 5 months ago by Rien Polak.
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AuthorPosts
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May 11, 2011 at 9:51 pm #12721Rien PolakMember
I`m using a time-frequency spectral analysis (in Flexpro 9)on .txt files containing 20 columns (first 2 being date and time) of data. On several of these files the analysis works fine. However when I try to use the time-frequency spectral analysis on several other files, the analysis object remains empty.
As far as I can discover all the source files are identical the way they contain the data and are all created by the same programme. Does anyone know of an issue with the sourcedata that could cause the analysis not to work?
Regards,
May 11, 2011 at 9:51 pm #8384Rien PolakMemberI`m using a time-frequency spectral analysis (in Flexpro 9)on .txt files containing 20 columns (first 2 being date and time) of data. On several of these files the analysis works fine. However when I try to use the time-frequency spectral analysis on several other files, the analysis object remains empty.
As far as I can discover all the source files are identical the way they contain the data and are all created by the same programme. Does anyone know of an issue with the sourcedata that could cause the analysis not to work?
Regards,
May 16, 2011 at 3:06 pm #9174Bernhard KantzParticipantSelect the analysis object, click the right mouse button and choose the command Open in the context menu. Run the FPScript formula (Ctrl+F5) and check the result / error message. Perhaps the input values are not equidistant.
May 16, 2011 at 11:22 pm #9176Rien PolakMemberThe message states:
The first argument of the function STFTSpectrum() does not meet the monotony requierements. The values of the x-component of signal must be equidistant with positive spacing.However the x-component (time) is added manually in the project database. Or is this referring to the time component in the data signal?
May 16, 2011 at 11:55 pm #9175Rien PolakMemberAlso on some datasets sometimes it will work sometimes it won`t. I`m not doing anything different at those times.
May 20, 2011 at 1:40 pm #9177Bernhard KantzParticipantAt first you have to resample your x-values using the Signal Sampling analyis object or the Sample FPScript function. With equidistant x-values the STFT should work.
May 20, 2011 at 2:13 pm #9178Rien PolakMemberEverything is working now. Thank you.
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