After you analyze the filter design, you can use the filter to process an input signal. Use the Processing VIs to process a signal with the filter you designed. The Processing VIs can process an input signal in the following two ways:
Refer to the Lowpass_Step 2_Perform Lowpass Filtering VI in the labview\examples\Digital Filter Design\Case Studies\Single-Rate Filter directory for an example that demonstrates how to apply a lowpass filter to a filtering application.