DFD Get Cascaded Coef VI

Digital Filter Design VIs and Functions

Owning Palette: Utilities VIs

Installed With: Digital Filter Design Toolkit

Converts a filter to an infinite impulse response (IIR) filter cluster that is compatible with the IIR Filter Cluster output in the Advanced IIR Filtering VIs.

You can wire the IIR Filter Cluster output of this VI to the IIR Filter Cluster input of the Advanced IIR Filtering VIs.

Example

Place on the block diagram

Find on the Functions palette

type specifies the type of coefficients to retrieve.

0	FLP (default)—Specifies to retrieve the coefficients of a floating-point filter. If filter in is a fixed-point filter, this VI retrieves the coefficients of the reference floating-point filter.
1	FXP—Specifies to retrieve the coefficients of a fixed-point filter. If filter in is a floating-point filter, this VI returns an error.

filter in specifies the input filter.

error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.

	status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
	code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
	source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.

filter out returns the filter in unchanged.

IIR Filter Cluster returns the cascaded form of the IIR filter coefficients.

	filter structure indicates either IIR second-order or IIR fourth-order filter stages.
	Reverse Coefficients is the reverse coefficients of the IIR cascade filter.
	Forward Coefficients is the forward coefficients of the IIR cascade filter.

gain returns the gain of the filter in linear units.

error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.

	status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
	code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
	source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.

Example

Refer to the Get Cascaded Coefficients of IIR Filter VI in the labview\examples\Digital Filter Design\Getting Started\Analyze Filters directory for an example of using the DFD Get Cascaded Coef VI.

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