DFD Get Transfer Function VI

Digital Filter Design VIs and Functions

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Owning Palette: Utilities VIs

Installed With: Digital Filter Design Toolkit

Retrieves the transfer function of a filter.

Examples

Place on the block diagram

Find on the Functions palette

type specifies the type of transfer function to retrieve.

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

numerator returns the numerator polynomial of the transfer function in ascending order of z^–1.

denominator returns the denominator polynomial of the transfer function in ascending order of z^–1.

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.

Examples

Refer to the following VIs for examples of using the DFD Get Transfer Function VI:

Get Integer Coef of Fixed-Point FIR Filter VI: labview\examples\Digital Filter Design\Fixed-Point Filters\Single-Rate
Open example Browse related examples
Get Transfer Function of Filter VI: labview\examples\Digital Filter Design\Getting Started\Analyze Filters
Open example Browse related examples

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