RMS Averaging (Spectrum)
- Updated2024-06-07
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RMS Averaging (Spectrum)
RMS averaging averages the power of a signal. The averaged RMS spectrum does not contain phase information. Thus, performing RMS averaging on spectra can reduce signal fluctuation but not the noise floor.
Use RMS averaging when you apply an order power spectrum to an unknown even-angle signal. RMS averaging works with signals with different order components and generates spectrum results. The NI Sound and Vibration Measurement Suite computes RMS averaging for an order power spectrum according to the following equation:
where X is the complex Fast Fourier Transform (FFT) of the even-angle signal X, and X* is the complex conjugate of X.
Related Information
- FFT, DFT, and Zoom
FFT, DFT, and Zoom are transforms used to convert data from the time domain into the frequency domain.