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filter (lowpass or highpass) a signal using a fast fourier transform. the algorithm uses the fourier harmonic closest to the requested cutoff frequency.
the base frequency of the fft reconstruction is:
freq= 1/(total time) the maximum frequency of the fft is:
freq_mas= freq * numframes / 2 the actual cutoff frequency is the closest multiple of the base frequency to the requested cutoff frequency
fft_filter /signal_types= the type of signal to be processed /signal_names= the names of the signals to be processed /signal_folder= the name of the signal folder /result_suffix= the ouput signal can have a suffix that can be applied to the original signal name /result_folder= the data tree folder that the resulting signal is placed. /frequency_cutoff= requested cutoff frequency /lowpass= true= lowpass - false= highpass ;