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Filter data with recursive (IIR) or nonrecursive (FIR) filter


filter is a MATLAB® function.

Signal-Specific Information

Filter Using digitalFilter Objects

Use filter in the form y = filter(d,x) to filter an input signal, x, with a digitalFilter, d, and obtain output data, y.

Use designfilt to generate d based on frequency-response specifications.

x can be a double- or single-precision vector. It can also be a matrix with as many columns as there are input channels.

FIR Filters

The denominator of FIR filters is, by definition, equal to 1. To use the filter function with the b coefficients from an FIR function, use y = filter(b,1,x).

Introduced before R2006a

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