Filters an input sequence using a specific interpolated FIR (IFIR) filter.
Programming Patterns
You can use the FIR Narrowband Filter Design node to generate the IFIR Filter for this node.
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signal
Input signal.
This input accepts the following data types:
-
1D array of double-precision, floating-point numbers
-
1D array of complex double-precision, floating-point numbers
-
Waveform
-
Waveform in complex double-precision, floating-point numbers
-
1D array of waveforms
-
1D array of waveforms in complex double-precision, floating-point numbers
IFIR filter
The IFIR filter.
filter type
Passband of the filter.
Name |
Description |
Lowpass |
Uses a lowpass filter.
|
Highpass |
Uses a highpass filter.
|
Bandpass |
Uses a bandpass filter.
|
Bandstop |
Uses a bandstop filter.
|
Default: Lowpass
interpolation
Interpolation factor.
The model filter is stretched by interpolation times.
model filter
Coefficients of the model filter.
image suppressor
Coefficients of the filter image suppressor.
error in
Error conditions that occur before this node runs.
The node responds to this input according to standard error behavior.
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
error in does not contain an error
|
error in contains an error
|
 |
 |
If no error occurred before the node runs, the node begins execution normally.
If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that
error information as error out.
|
If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.
|
Default: No error
filtered signal
Filtered signal.
This output can return the following data types:
-
1D array of double-precision, floating-point numbers
-
1D array of complex double-precision, floating-point numbers
-
Waveform
-
Waveform in complex double-precision, floating-point numbers
-
1D array of waveforms
-
1D array of waveforms in complex double-precision, floating-point numbers
error out
Error information.
The node produces this output according to standard error behavior.
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
error in does not contain an error
|
error in contains an error
|
 |
 |
If no error occurred before the node runs, the node begins execution normally.
If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that
error information as error out.
|
If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.
|
Algorithm for Calculating the Delay for the Filter
The overall filter is a linear-phase FIR filter. This node calculates the delay for the filter using the following equation:
where
- NG is the number of elements in Model Filter
- NI is the number of elements in Image Suppressor
- M is the value of interpolation
Where This Node Can Run:
Desktop OS: Windows
FPGA: Not supported
Web Server: Not supported in VIs that run in a web application