As the transfer functions are specified in the frequency domain they may be superposed. This can be utilised for the conversion of time series data from a pressure sensor located at the sea bottom to an equivalent time series of surface elevations. The operation can be performed swiftly by combining the transfer function for pressure to surface elevation with a high-pass filter, where the latter automatically removes tidal variations and subtracts the still water level.
Truncating the filter coefficients will shorten the sequence of delete values that always will appear at the start and end of the filtered time series.