filter

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)

Authors

• Serge Steer, INRIA