filter

filters a data sequence using a digital filter

Calling Sequence

[y,zf] = filter(num,den,x [,zi])

Arguments

:num real vector : the coefficients of the filter numerator in

decreasing power order, or a polynomial.

: :den real vector : the coefficients of the filter denominator in

decreasing power order, or a polynomial.

: :x real row vector : the input signal : :zi real row vector of length max(length(a),length(b))-1: the

initial condition relative to a “direct form II transposed” state space representation. The default value is a vector filled with zeros.

: :y real row vector : the filtered signal. : :zf real row vector : the final state. It can be used to filter a

next batch of the input signal.

:

Description

This function filters a data sequence using a digital filter using a “direct form II transposed” implementation

References

Oppenheim, A. V. and R.W. Schafer. Discrete-Time Signal Processing, Englewood Cliffs, NJ: Prentice-Hall, 1989, pp. 311-312.

See Also

• flts time response (discrete time, sampled system)
• rtitr discrete time response (transfer matrix)
• ltitr discrete time response (state space)