Designs an IIR cascade filter as specified by the Bessel filter model.
To filter a sequence of data, wire the filter output to the Filtering node.
The order of the IIR cascade filter.
|IIR 2nd Order||0||Returns IIR second-order filter stages.|
|IIR 4th Order||1||Returns IIR fourth-order filter stages.|
|Auto Select||10||Returns either IIR second-order or IIR fourth-order filter stages according to filter type. If filter type is Lowpass or Highpass, this node returns IIR second-order filter stages. If filter type is Bandpass or Bandstop, this node returns IIR fourth-order filter stages.|
Default: Auto Select
The passband of the filter.
Uses a lowpass filter.
Uses a highpass filter.
Uses a bandpass filter.
Uses a bandstop filter.
The low cutoff frequency in Hz. This value must observe the Nyquist criterion.
When filter type is Bandpass or Bandstop, this value must be less than high cutoff frequency.
The high cutoff frequency, in Hz. This value must observe the Nyquist criterion.
The node places the following restrictions on this parameter according to filter type:
|Lowpass or Highpass||The node ignores this input.|
|Bandpass or Bandstop||This value must be greater than low cutoff frequency and less than half of sampling frequency.|
The order of the IIR filter.
This value must be greater than zero.
Error conditions that occur before this node runs. The node responds to this input according to standard error behavior.
Default: No error
The sampling frequency, in Hz.
sampling frequency must be greater than zero. If this input is less than or equal to zero, this node returns an error as well as an empty array for reverse coefficients and forward coefficients.
Output IIR cascade filter.
Structure of the output filter.
The forward coefficients of the IIR cascade filter.
The reverse coefficients of the IIR cascade filter.
The sampling frequency in Hz.
Error information. The node produces this output according to standard error behavior.
Where This Node Can Run:
Desktop OS: Windows
FPGA: Not supported