zerophase
Zero-phase response of discrete-time filter System object
Syntax
Description
Examples
Zero-phase Response of Discrete-Time Filter
Create a dsp.FIRFilter System object™ and compute the zero-phase response of the filter.
Fs = 8000;
Fcutoff = 2000;
FIRFilt = dsp.FIRFilter(Numerator=designLowpassFIR(FilterOrder=130,...
CutoffFrequency=Fcutoff/(Fs/2)));
The zerophase
function computes and plots the zero-phase response of the filter.
zerophase(FIRFilt)
Input Arguments
sysobj
— Input filter
filter System object
n
— Number of points over which zero-phase response is evaluated
8192 (default) | positive integer
Number of points over which the zero-phase response is evaluated around the upper
half of the unit circle. For an FIR filter where n
is a power of
two, the computation is done faster using FFTs.
Data Types: double
arithType
— Arithmetic type
'double'
(default) | 'single'
| 'Fixed'
Arithmetic used in the filter analysis, specified as 'double'
,
'single'
, or 'Fixed'
. When the arithmetic
input is not specified and the filter System object is unlocked, the analysis tool assumes a double-precision filter. When the
arithmetic input is not specified and the System object is locked, the function performs the analysis based on the data type of
the locked input.
The 'Fixed'
value applies to filter System objects with fixed-point
properties only.
When the 'Arithmetic'
input argument is specified as
'Fixed'
and the filter object has the data type of the
coefficients set to 'Same word length as input'
, the arithmetic
analysis depends on whether the System object is unlocked or locked.
unlocked –– The analysis object function cannot determine the coefficients data type. The function assumes that the coefficients data type is signed, has a 16-bit word length, and is auto scaled. The function performs fixed-point analysis based on this assumption.
locked –– When the input data type is
'double'
or'single'
, the analysis object function cannot determine the coefficients data type. The function assumes that the data type of the coefficients is signed, has a 16-bit word length, and is auto scaled. The function performs fixed-point analysis based on this assumption.
To check if the System object is locked or unlocked, use the isLocked
function.
When the arithmetic input is specified as 'Fixed'
and the filter
object has the data type of the coefficients set to a custom numeric type, the object
function performs fixed-point analysis based on the custom numeric data type.
Output Arguments
zphase
— Zero-phase response vector
vector
Zero-phase response vector, evaluated at n
equally-spaced
points around the upper half of the unit circle, returned as a vector. If
n
is not specified, the function uses a default value of
8192
.
Data Types: double
w
— Frequency vector
vector
Frequency vector of length n
in radians/sample.
w
consists of n
equally-spaced points 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
.
Data Types: double
Version History
Introduced in R2011aR2024b: Support for dsp.VariableFIRDecimator
and dsp.VariableFIRInterpolator
Objects
Starting in R2024b, the zerophase
analysis function supports the
dsp.VariableFIRDecimator
and dsp.VariableFIRInterpolator
objects.
R2024b: dsp.BiquadFilter
object warns
The dsp.BiquadFilter
object issues a warning and will be removed in a
future release. Use the dsp.SOSFilter
object
instead. For more information on how to replace your existing code, see the
Compatibility Considerations section in the dsp.BiquadFilter
reference page.
R2024b: Support for dsp.DCBlocker
object
Starting in R2024b, this function supports the dsp.DCBlocker
object.
R2024a: zerophase
function no longer uses Filter Visualization
Tool
When you call the zerophase
function with no output arguments, the
function no longer uses Filter Visualization Tool to plot the zero phase response of the
filter. Starting in R2024a, the function uses the MATLAB® plot instead.
You do not need to make any changes to your code.
R2023b: Support for dsp.ParallelFilter
and dsp.Delay
Objects
Starting in R2023b, the zerophase
analysis function supports the
dsp.ParallelFilter
and the dsp.Delay
objects.
R2023b: dsp.BiquadFilter
object will be removed
The dsp.BiquadFilter
object will be removed in a future release. Use
the dsp.SOSFilter
object
instead.
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