filtering an array of wave forms

[erfan6511]

Hi,

I'm new to labview and I'm trying to use butterworth filter on signals i'm acquiring through DAQ device. SO here's the problem: when I connect this array to the filter it doesn't show anything. when I try to use GET WAVEFORM COMPONENT it causes an error that says there is a mismatch of the types . so how can I use a filter for this signal?

regards

erfan

[GerdW]

Hi erfan,

there are NO waveforms in your picture.

Why do you even think you can use the GetWaveformComponents function here?

when I connect this array to the filter it doesn't show anything.

What is the error output of the filter function?

[erfan6511]

Hi GerdW,

Perhaps I've misunderstood the difference between waveforms and signals. But regarding my problem, there is no error. it just doesn't show anything on the graph, while my signal is being displayed without problem. Since I want to filter the data in real time, I also tried using pt by pt butterworth filter, which gives the error that says "the type of the source is 1D array of single, the type of the sinc is double". 

Sorry if my question is too simplistic and for the vague explanation. thanks for your time

erfan

[GerdW]

Hi erfan,

instead of posting pictures you should post VIs/snippets with useful default data embedded!

Otherwise all we can do is gazing into our crystal balls…

[griff32]

erfan,

Here is a simple idea that may help. put a probe at the input to your filter, if nothing is going in you can't get anything out.