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Member of the filter design class.

Syntax

zerophase(b)

zerophase(b, a)

zerophase(b, a, w)

zerophase(b, a, w, fs)

zerophase(b, a, n)

zerophase(b, a, n, 'whole')

zerophase(b, a, n, fs)

zerophase(b, a, n, 'whole', fs)

h = zerophase(b)

h = zerophase(b, a)

h = zerophase(b, a, w)

h = zerophase(b, a, w, fs)

h = zerophase(b, a, n)

h = zerophase(b, a, n, 'whole')

h = zerophase(b, a, n, fs)

h = zerophase(b, a, n, 'whole', fs)

[h, f] = zerophase(b)

[h, f] = zerophase(b, a)

[h, f] = zerophase(b, a, w)

[h, f] = zerophase(b, a, w, fs)

[h, f] = zerophase(b, a, n)

[h, f] = zerophase(b, a, n, 'whole')

[h, f] = zerophase(b, a, n, fs)

[h, f] = zerophase(b, a, n, 'whole', fs)

[h, f, p] = zerophase(b)

[h, f, p] = zerophase(b, a)

[h, f, p] = zerophase(b, a, w)

[h, f, p] = zerophase(b, a, w, fs)

[h, f, p] = zerophase(b, a, n)

[h, f, p] = zerophase(b, a, n, 'whole')

[h, f, p] = zerophase(b, a, n, fs)

[h, f, p] = zerophase(b, a, n, 'whole', fs)

Description

Computes the zero phase response vector and the frequency vector of a filter. If you do not specify an output, zerophase plots the zero phase response of the filter in the current plot window. zerophase(b) is equivalent to zerophase(b, [1], 512). zerophase(b, a) is equivalent to zerophase(b, a, 512).

Details

Examples

Inputs

Name	Description
b	Specifies the numerator coefficients of the filter. b is a vector.
a	Specifies the denominator coefficients of the filter. a is a vector. The default is [1].
w	Specifies the frequency points at which you want to evaluate the zero phase response. If you do not specify w, LabVIEW evaluates the zero phase response at n points equally spaced around the upper half of the unit circle. w is a vector.
fs	Specifies the sampling frequency in Hz. fs is a scalar.
n	Specifies the number of frequency points. n is a positive integer. The default is 512.
'whole'	Directs LabVIEW to evaluate the zero phase response at n points equally spaced around the unit circle.

Outputs

Name	Description
h	Returns the zero phase response vector of the filter. h is a real vector.
f	Returns the discrete frequency vector in radians/sample that corresponds to h. f is a vector.
p	Returns the continuous phase vector of the filter. p is a real vector.

Details

This function is supported in the LabVIEW Run-Time Engine only if you request an output from the function. This function can remain in your scripts when you build a stand-alone application or shared library, but if you do not request an output, the LabVIEW Run-Time Engine does not execute this function. If you request an output, the LabVIEW Run-Time Engine executes this function as normal.

Examples

b = [1, 2];
a = [-1, 1, 1, 3];
n = 32;
[H, F] = zerophase(b, a, n)

Related Topics

freqz
grpdelay
impz
phasez