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vbfilter [<flags>] <1D or 4D file/dir> ...
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-lp <freq> lowpass: pass frequencies <= freq
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-hp <freq> highpass: pass frequencies >= freq
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-bp <f1> <f2> bandpass: pass frequencies f1 <= freq <=f2
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-bs <f1> <f2> bandstop: squash frequencies f1 <= freq <= f2
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-rl <n> remove lows: remove the n lowest frequencies
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-rh <n> remove highs: remove the n highest frequencies
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-rm <range> remove range: remove ordinal frequencies (e.g., 4-7)
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-o <filename> set output file name
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-i print info but don't actually do anything
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-p <ms> specify sampling period in ms
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Use the -i option to see the ordinal list of frequencies.
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All specified filtering options will be applied in sequence, but
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once an option removes a frequency, subsequent options won't restore
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The rl and rh options take counts, so -rl 1 means to remove the
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single lowest frequency. The rm option removes ordinal frequencies
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If no output filename is provided with -o, then the input filename