sddsdigfilter performs time-domain digital filtering of columns of data. Filters can be combined in series and/or cascade to produce complex filter characteristics. In addition to allowing simple 1-pole lowpass and highpass filters, filter charateristics can be defined using either digital 'Z' or analog 'S' domain transfer functions.
A digital filter has a Z transform given by
Pass data through lowpass filter with a -3dB cutoff of 0.01 Hz:
Bandstop filter between 10 Hz and 100 Hz:
Bandpass filter between 10 Hz and 100 Hz:
Analog transfer function:
Five-sample digital delay: