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tf

Transfer function

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Syntax

[B,A] = tf(npFilter)
[B,A,B2,A2] = tf(npFilter)

Description

[B,A] = tf(npFilter) returns the vector of numerator coefficients, B, and the vector of denominators, A, for the equivalent transfer function corresponding to the notch filter.

example

[B,A,B2,A2] = tf(npFilter) also returns the vector of numerator coefficients, B2, and the vector of denominator coefficients, A2, for the equivalent transfer function corresponding to the peak filter.

Examples

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Open Live Script

Create a dsp.NotchPeakFilter System object™. Obtain the coefficients of the transfer function corresponding to the notch and peak filters.

notchpeak = dsp.NotchPeakFilter;
[Bnotch,Anotch,Bpeak,Apeak] = tf(notchpeak)
Bnotch = 1×3

    0.8633   -0.0000    0.8633


Anotch = 1×3

    1.0000   -0.0000    0.7265


Bpeak = 1×3

    0.1367         0   -0.1367


Apeak = 1×3

    1.0000   -0.0000    0.7265

Bnotch and Anotch are the vectors of numerator and denominator coefficients for the equivalent transfer function corresponding to the notch filter. Bpeak and Apeak are the vectors of numerator and denominator coefficients for the equivalent transfer function corresponding to the peak filter.

Input Arguments

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Notch peak filter object, specified as a dsp.NotchPeakFilter object.

Output Arguments

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Numerator coefficients for the equivalent transfer function corresponding to the notch filter, specified as a vector.

Data Types: double

Denominator coefficients for the equivalent transfer function corresponding to the notch filter, specified as a vector.

Data Types: double

Numerator coefficients for the equivalent transfer function corresponding to the peak filter, specified as a vector.

Data Types: double

Denominator coefficients for the equivalent transfer function corresponding to the peak filter, specified as a vector.

Data Types: double

Version History

Introduced in R2014a

See Also

Functions

Objects