iir_yulewalker (MathScript RT Module Function)

LabVIEW 2012 MathScript RT模块帮助

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Owning Class: filter design

Requires: MathScript RT Module

Syntax

[x, y] = iir_yulewalker(n, f, a)

Legacy Name: yulewalk

Description

Uses the modified Yule-Walker method to create an IIR filter.

Examples

Inputs

Name Description
n Specifies the filter order.
f Specifies a vector of frequency points. f is a real vector of non-descending values in the interval [0, 1]. 1 represents the Nyquist frequency.
a Specifies the magnitudes of the filter at the frequency points in f. length(a) must equal length(f).

Outputs

Name Description
x Returns the forward coefficients of the IIR filter. The length of x equals n + 1.
y Returns the backward coefficients of the IIR filter. The length of y equals n + 1.

Details

The following table lists the support characteristics of this function.

 Supported in the LabVIEW Run-Time Engine Yes Supported on RT targets Yes Suitable for bounded execution times on RT Not characterized

Examples

f0 = [0, 0.2, 0.4, 1];
a0 = [1, 1, 0, 0];
[x0, y0] = iir_yulewalker(8, f0, a0);

f1 = [0, 0.1, 0.1, 0.9, 0.9, 1];
a1 = [0, 0, 1, 1, 0, 0];
[x1, y1] = iir_yulewalker(11, f1, a1);

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