• filtfilt(x, C)—Computes the zero-phase response of a filter, using a "forward-backward" filtering model.
The function returns a vector of length x, containing the filtered response. The calculation corresponds to two sequential calls to the
response function with the same filter coefficients, using the reversed output of the first call as input for the second call.
Arguments
• x is a complex-valued vector.
• C is a matrix of filter coefficients, in cascade form.