phasedelay (MathScript RT Module Function)

LabVIEW 2012 MathScript RT模块帮助

版本日期:June 2012



Owning Class: filter design

Requires: MathScript RT Module



phasedelay(b, a)

phasedelay(b, a, w)

phasedelay(b, a, w, fs)

phasedelay(b, a, n)

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

phasedelay(b, a, n, fs)

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

h = phasedelay(b, a, w)

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

[h, f] = phasedelay(b)

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

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

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

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

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


Computes the phase delay vector and the frequency vector of a filter. If you do not request an output, this function plots the phase delay of the filter in the current plot window. phasedelay(b) is equivalent to phasedelay(b, [1], 512). phasedelay(b, a) is equivalent to phasedelay(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 phase delay. If you do not specify w, LabVIEW evaluates the phase delay 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 phase delay at n points equally spaced around the unit circle.


Name Description
h Returns the phase delay 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.


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] = phasedelay(b, a, n)

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