Generates the set of filter coefficients to implement an IIR filter as specified by the Chebyshev II Filter model.
To filter a sequence of data, pass the output of this node to IIR Cascade Filter.
filter structure option
The order of the IIR cascade filter in IIR filter cluster.
|IIR 2nd Order
|| Returns IIR second-order filter stages.
|IIR 4th Order
|| Returns IIR fourth-order filter stages.
|| Returns either IIR second-order or IIR fourth-order filter stages according to the 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: 2—Auto Select
The passband of the filter.
Uses a lowpass filter.
Uses a highpass filter.
Uses a bandpass filter.
Uses a bandstop filter.
The sampling frequency in Hz.
If this value is less than or equal to zero, the node returns an error as well as an empty array for IIR filter cluster.
Default: 1.0 Hz
high cutoff frequency
The high cutoff frequency, in Hz.
The node places the following restrictions on this parameter according to filter type:
|0 (Lowpass) or 1 (Highpass)
||The node ignores this input.
|2 (Bandpass) or 3 (Bandstop)
||This value must be greater than low cutoff frequency and less than half of sampling frequency. It must also observe the Nyquist criterion.
low cutoff frequency
The low cutoff frequency in Hz. This value must observe the Nyquist criterion. When filter type is 2 (Bandpass) or 3 (Bandstop), this value must be less than high cutoff freq: fh.
Default: 0.125 Hz
The attenuation, in decibels, in the stopband. If attenuation is less than or equal to 0, the node returns 0 as well as an error.
The order of the IIR filter.
This value must be greater than zero.
IIR filter cluster
The cascaded form of IIR filter coefficients.
Either IIR second-order or IIR fourth-order filter stages.
The reverse coefficients of the IIR cascade filter.
The forward coefficients of the IIR cascade filter.
A value that represents any error or warning that occurs when this node executes.