Convolution and Correlation Express VI

Owning Palette: Signal Analysis Express VIs

Requires: Full Development System

Performs convolution, deconvolution, or correlation on the input signals.

Dialog Box Options

Block Diagram Inputs

Block Diagram Outputs

Add to the block diagram

Find on the palette

Dialog Box Options

Parameter	Description
Signal Processing	Contains the following options: Convolution—Computes the convolution of the input signals. Deconvolution—Computes the deconvolution of the input signals. Autocorrelation—Computes the autocorrelation of the input signal. Cross correlation—Computes the cross correlation of the input signals. Ignore time stamp—Specifies to ignore the time stamp of the input signals. This option is available only when you place a checkmark in the Convolution or Deconvolution checkbox. If you place a checkmark in the Ignore time stamp checkbox, the resulting signal has the delay you expect with classic convolution. If you do not place a checkmark in the checkbox, LabVIEW shifts the resulting signal negatively in time to compensate for the filter length.
Sample Input Data	Displays sample input signals you can use as a reference to determine how the configuration options you select affect the actual input signals. If you wire data to the Express VI and run it, Sample Input Data displays real data. If you close and reopen the Express VI, Sample Input Data displays sample data until you run the VI again.
Result Preview	Displays a preview of the measurement. The Result Preview plot indicates the value of the selected measurement with a dotted line. If you wire data to the Express VI and run the VI, Result Preview displays real data. If you close and reopen the Express VI, Result Preview displays sample data until you run the VI again. If the cutoff frequency values are invalid, Result Preview does not display valid data.

Block Diagram Inputs

Parameter	Description
X	Contains the input signal X.
Y	Contains the input signal Y.
error in	Describes error conditions that occur before this node runs.

Block Diagram Outputs

Parameter	Description
X*Y	Returns the convolution of X and Y.
error out	Contains error information. This output provides standard error out functionality.

This Express VI operates similarly to the following VIs and functions:

AutoCorrelation
Convolution
CrossCorrelation
Deconvolution

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