FIR Filtering Design with Optional Parameters

[gareth1983]

Was trying hands-on in creating my own VI with reference to the existing one available for LabView 8.5 - FIR Filtering Design with Optional Parameters.

Everything which I had created is the same as what was provided, however there pop an error which I'm not sure what it is. Can anyone help me take a look, and how can I rectify these problem? The error only appears when you run the program.

[johnsold]

Gareth,

The error is one which you put in!  The constant you have connected to the error cluster wiring has a boolean value of True, which mean that an error has occurred.  Either replace it with a constant made from a real error cluster or actually put an Error in control in its place.

Lynn 

[gareth1983]

Hi Lynn,

thanks for the info. I'd corrected it. somehow there's another small error message. i set the Fs to be 2x the frequency and a message keep popping out asking me to change the Fs.

[johnsold · Accepted solution]

The Nyquist criterion is that the sampling frequency must be greater than twice the highest frequency of interest.  If you have it set at exactly twice the highest frequency, you are still not satisfying the criterion.  Depending on the nature of the signal you want to filter setting it 5 to 10 times higher may give better performance.

Lynn