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**Owning Class: **filter design

**Requires: **MathScript RT Module

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)

Computes the zero phase response vector and the frequency vector of a filter. If you do not request an output, this function 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).

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. |

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. |

The following table lists the support characteristics of this function.

Supported in the LabVIEW Run-Time Engine | Yes (if you request output) |

Supported on RT targets | Yes (if you request output) |

Suitable for bounded execution times on RT | Not characterized |

b = [1, 2];

a = [-1, 1, 1, 3];

n = 32;

[H, F] = zerophase(b, a, n)