Documentation

This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

zerophase

Zero-phase response of discrete-time filter System object

Syntax

[zphase,w] = zerophase(sysobj)
[zphase,w] = zerophase(sysobj,n)
[zphase,w] = zerophase(sysobj,Name,Value)
zerophase(sysobj)

Description

[zphase,w] = zerophase(sysobj) returns the instantaneous zero-phase response zphase of the filter System object™, sysobj, based on the current filter coefficients. The vector w contains the frequencies (in radians) at which the function evaluates the zero-phase response.

The zero-phase response is evaluated at 8192 points equally spaced around the upper half of the unit circle.

[zphase,w] = zerophase(sysobj,n) returns the instantaneous zero-phase response of the filter System object and the corresponding frequencies at n points equally spaced around the upper half of the unit circle.

[zphase,w] = zerophase(sysobj,Name,Value) returns the zero-phase response with additional options specified by one or more Name,Value pair arguments.

zerophase(sysobj) displays the zero-phase response of the filter System object sysobj in the fvtool.

For information on more input options, refer to zerophase in Signal Processing Toolbox™ documentation.

Input Arguments

collapse all

sysobj

Filter System object.

The following Filter System objects are supported by this analysis function:

n

Number of samples. For an FIR filter where n is a power of two, the computation is done faster using FFTs.

Default: 8192

Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside single quotes (' '). You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

collapse all

Specify the arithmetic used during analysis. When you specify 'double' or 'single', the function performs double- or single-precision analysis. When you specify 'fixed' , the arithmetic changes depending on the setting of the CoefficientDataType property and whether the System object is locked or unlocked.

 Details for Fixed-Point Arithmetic

When you do not specify the arithmetic for non-CIC structures, the function uses double-precision arithmetic if the filter System object is in an unlocked state. If the System object is locked, the function performs analysis based on the locked input data type. CIC structures only support fixed-point arithmetic.

Output Arguments

zphase

Zero phase response vector of length n. If n is not specified, the function uses a default value of 8192.

w

Frequency vector of length n, in radians/sample. w consists of n points equally spaced around the upper half of the unit circle (from 0 to π radians/sample). If n is not specified, the function uses a default value of 8192.

See Also

Functions

Introduced in R2011a

Was this topic helpful?