Windowed sinc filter

The FIR windowed sinc filter is a symmetrical non--causal filter. It acts within the frequency band as an “ideal” low-pass filter.

The filter engagement frequency is specified in the frequency parameters. The degree of signal smoothing can be adjusted by specifying a filter order. The higher the order, the stronger the filter effect.

The filter core corresponds to a windowed sinc function, see Fig. “Filter core of windowed sinc filter”. The resulting characteristic filter curve (step response) is depicted in Fig. “Step response of windowed sinc filter”.

The examples are calculated with order 40 frequency 100 Hz.