Second-order (biquadratic) IIR digital filtering
[1] Bank, Balázs. "Converting Infinite Impulse Response Filters to Parallel Form". IEEE Signal Processing Magazine. Vol. 35, Number 3, May 2018, pp. 124-130.
[2] Orfanidis, Sophocles J. Introduction to Signal Processing. Englewood Cliffs, NJ: Prentice-Hall, 1996.
filter
| medfilt1
| sgolayfilt