AR-Filter
Signal Post Processing  Time Signals AR Filter for Port Signals...
Signal Post Processing Time Signals AR Filter for Probe Signals...
Signal Post Processing Time Signals AR Filter for Monitors...
Auto regressive filters are capable of calculating spectra for time
signals that have not yet reached steady state. You can save a huge amount
of calculation time, especially for highly resonant structures, by applying
these filters to a set of time signals. These time signals can be the
output signals at a port, the signals recorded by a probe or current and
voltage monitors.
See the AR-Filter
Overview page to learn about the basic concepts
of auto regressive filters.
The AR-filter dialog box helps you to find an appropriate filter and
gives you the opportunity to supervise and abort the whole filter and
spectra or S-parameter determination process. After a calculation run,
you will obtain a printed summary and a new set of spectra or S-parameters
respectively based on the found AR-filter.
Please note, that for S-Parameter calculations in the time domain it
is possible to reduce simulation time significantly by applying the AR-filter
online.
First time step
Enter the first time step from which filter
determination starts.
Skip time steps
Enter the number of time steps that will be
skipped after a filter has been found and before the next filter will
be determined.
Max. frequency
Because the time signals will be low pass filtered
within the AR calculation process, you need to specify the maximum frequency
of the low pass filter here (usually : 1,2 * fmax (from the Frequency
dialog box)).
Max. order of filter
Enter the number of recursive filter elements
here. Higher order filters usually deliver more accurate results, but
the calculation time increases quadratically with the number of filter
elements (max. 100 elements).
Relative window length
This entry describes the length of the analyzed
time interval relative to the maximum number of elements.
e.g. Max. order of filter : 40
Relative
window length : 2
Number
of analyzed time samples 40 * 2 = 80
Progress and status
This dialog group gives you information about
the status and the energy error of the currently calculated filter.
Because such a calculation can last some time
you might want to abort it pressing the Accept
button when the displayed energy error is acceptable (small enough).
Accept
Press this button to abort the current calculation
run and use the best calculated filter until this point.
Defaults
Resets all values to the default values.
Start
Starts the filter determination. After the calculations
have been finished, the information about the filter found will be printed
within the AR-filter results
dialog box. The calculated results are listed in the navigation tree with
the ending (AR).
Abort
Aborts a complete calculation run without leaving
the dialog box.
Help
Shows this help text.
OK
Stores your settings and closes the dialog box.
Cancel
Closes this dialog box without performing any
further action.
See also
AR-Filter
Overview, AR-filter results,
Special
Solver Parameters - AR-Filter, Signals
in Time Domain Simulations Overview
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