User`s guide

Resampling Data
Resampling Data
Using the GUI
Use the System Id
entification Tool GUI to resample time-domain data. To
specify additio
nal options, such a s the prefilter order, see “Resampling Data
at the Command Li
ne” on page 1-101.
The System Iden
tification Tool G UI uses
idresamp to interpolate or dec imate
the data. For mo
re information about this command, type
help idresam p at
the prompt.
To create a new d
ata set by resampling the input and output s ignals:
1 Import time-d
omain data into the System Identification To ol GU I, as
described in “
Representing Data in the GUI” on p age 1-13.
2 Drag the d ata set you want to resample to the Working Data area.
3 In the Resampling factor field, enter the factor by which to multiply the
current sampling interval:
• Fordecimation(fewersamples),enterafactorgreaterthan
1 to increase
thesamplingintervalbythisfactor.
• For interpolation (more samples), enter a factor less than
1 to decrease
thesamplingintervalbythisfactor.
Default =
1.
4 In the Data name field, type the name of the new data set. Choose a nam e
that is unique in the Data Board.
5 Click Insert to add the new data set to the Data Board in the System
Identification Toolbox window.
6 Click Close
to close t he Resample dialog box.
Resampling
Data at the Command Line
Use resamp l
e
to decimate and interpolate time-dom ain iddata objects. You
can s pecify
the order of the antialiasing filter as an argum e n t .
1-101