Restore B-Field Signal Using Calibration Table

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SUMMARY

The discussion focuses on restoring the B-field amplitude signal (B(t)) using a calibration table with frequency, amplitude, and phase data. The user attempted to apply a Fast Fourier Transform (FFT) in MATLAB, followed by calibration and inverse FFT, but encountered issues with signal splicing. A solution was suggested involving the creation of a filter based on the calibration table to address the splicing problem, indicating a potential windowing issue.

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  • Understanding of B-field induction probes and their characteristics
  • Proficiency in MATLAB for signal processing
  • Knowledge of Fast Fourier Transform (FFT) techniques
  • Familiarity with signal filtering and windowing concepts
NEXT STEPS
  • Learn how to implement windowing techniques in MATLAB for signal processing
  • Research the creation of filters from calibration tables in MATLAB
  • Explore advanced FFT applications and their implications in signal restoration
  • Study the effects of non-linear amplitude-frequency characteristics on signal processing
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This discussion is beneficial for electrical engineers, signal processing specialists, and researchers working with B-field induction probes and MATLAB signal analysis.

poklad
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Hi All!

I has probe (B-field induction probe) with non linear amplitude-frequency characteristic. I has calibration table with 3 columns: frequency, amplitude, phase. I has output signal U(t) recorded with sample frequency Fs during rather long time.
Can I restore input signal (i.e. B-field amplitude B(t))?
I try to use (in Matlab) the next algorithm: FFT conversion -> apply calibration -> reverse FFT conversion.
But I obtain jump at splicing.

It seems I must create filter from my calibration table and filtered my signal. But how?

Jury
 
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poklad said:
Hi All!

I has probe (B-field induction probe) with non linear amplitude-frequency characteristic. I has calibration table with 3 columns: frequency, amplitude, phase. I has output signal U(t) recorded with sample frequency Fs during rather long time.
Can I restore input signal (i.e. B-field amplitude B(t))?
I try to use (in Matlab) the next algorithm: FFT conversion -> apply calibration -> reverse FFT conversion.
But I obtain jump at splicing.

It seems I must create filter from my calibration table and filtered my signal. But how?

Jury

Sounds like a (lack of) windowing (filter) problem.

http://www.mathworks.com/help/toolbox/signal/window.html
 
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