Playback options
I connected a signal Signal Express. The recorded signal was acquired of sound spectrum of a NI DAQ system. I want to select only part of the spectrum, do a mean quadratic value and then create a snapshot of that part of the sound spectrum medium to export to Excel. This is the step I did:
- Add step--> analysis-->--> measures areas of frequency power spectrum.
- In the average label--> with an average of Mode--> mean quadratic value.
- In the playback Options label--> for example: Start time-> 12 000 stop time: 16 700
- Scan of the spectrum to the data view
My question is: what do I have to pulse 'play' buttons to make an average of these 4 700 seconds, then create and snapshot to export to Excel? If I push "play" it does not and the average of this time interval, the signal continues to scroll. Y at - it any othe for this option?
Thank you
Aitor Aramburu
The following equation can help you understand your FFT resolution.
Delta-f - resolution FFT
FS - sampling freq
N - length of FFT
So if you re - sample at the same sampling freq relative to the length of the FFT, you get the same resolution. Note that you must always respect the theorem of niquest to maintain the validity of the results.
More of the subject can be found here
Tags: NI Products
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