Butterworth Filter
Use the Butterworth option to apply a Fast-Fourier Transform Butterworth filter to a channel.
The filter option is available with the following extensions and menus:
- Geophysics: 1D FFT > 1D Filtering
- Gravity and Terrain Correction: Moving Platform Gravity > Apply Single FFT Filter
Butterworth filter options
Application Notes
The Butterworth filter is excellent for applying straight forward high-pass and low-pass filters to data because you can easily control the degree of filter roll-off while leaving the central wavenumber fixed. If ringing is observed, the degree can be reduced until acceptable. A common, but more complicated alternative is the Cosine Filter).
Butterworth Filter
Parameters:
k0 |
Central wavenumber of the filter. |
n | Degree of the Butterworth filter function. By default, we assume a degree of 8. |
0/1 |
Residual/Regional flag to specify if a residual high pass or a regional low pass is required. By default, the system applies a regional filter. |
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