MATLAB SIGNAL PROCESSING TOOLBOX 6 Bedienungsanleitung PDF herunterladen (Seite 34)

3 Design a Filter with fdesign and filterbuilder

3-6

>> BandPassFiltSysObj = design(BandPassSpecObj,...

'equiripple','SystemObject',true)

System: dsp.FIRFilter

Properties:

Structure: 'Direct form'

NumeratorSource: 'Property'

Numerator: [1x44 double]

InitialConditions: 0

FrameBasedProcessing: true

Show fixed-point properties

Available design methods and design options for filter System objects are not

necessarily the same as those for filter objects.

Note: If you do not specify a design method, a default method will be used. For

example, you can execute the command

>> BandPassFilt = design(BandPassSpecObj)

BandPassFilt =

FilterStructure: 'Direct-Form FIR'

Arithmetic: 'double'

Numerator: [1x44 double]

PersistentMemory: false

and a design method will be selected automatically.

To check your work, you can plot the filter magnitude response using the Filter

Visualization tool. Verify that all the design parameters are met:

>> fvtool(BandPassFilt) %plot the filter magnitude response

If you have the DSP System Toolbox installed, the Filter Visualization tool produces

the following figure with the dashed red lines indicating the transition bands and

unity gain (0 in dB) over the passband.

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MATLAB SIGNAL PROCESSING TOOLBOX 6 Bedienungsanleitung Seite 34