Applies a zero phase filter to a signal.
Input filter. You must specify filter in direct IIR form.
Specifying filter in Direct IIR Form
Use the Filter Design node to get cascade form IIR filter coefficients. Then use the Filter Conversion node to convert the resulting filter to direct form.
Structure of the filter.
|IIR Cascade 2nd Order||0||Uses IIR second-order filter stages.|
|IIR Cascade 4th Order||1||Uses IIR fourth-order filter stages.|
|IIR Direct||2||Uses the direct-form IIR filter.|
|FIR||3||Uses the FIR filter.|
Default: IIR Cascade 2nd Order
Forward coefficients of the filter.
Reverse coefficients of the filter.
The sampling frequency in Hz.
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
Error information. The node produces this output according to standard error behavior.
This node filters the input signal as shown in the following illustration:
g-n is the reverted sequence of gn. H(z) is an IIR filter whose coefficients are specified by filter. You must specify filter in direct IIR form.
With a zero phase filter, the output signal has no phase distortion. Although the zero phase filter is non-causal, it is useful in offline applications such as filtering a sound file saved on disk.
Where This Node Can Run:
Desktop OS: Windows
FPGA: Not supported