trigger an output signal based on input signal

[samik]

  Dear Members,

           I am using NI-PCI 6035E DAQ board with labview 8.2. Now I have one  signal coming from one  sensor from which I need to filter out one particular frequency component ( after acquiring the signal, I have to do the filtering in labview only)  and then based on the filtered signal ( when the filterd signal crosses a threshold value with a positive slope) I need to generate an output voltage which will act as a trigger for image capturing by a ccd camera.

          I found out from " find examples" two examples  "cont gen voltage wfm-int clk-analog start.vi" and "cont Acq & graph voltage-Int clk.vi" . I tried to put them in one programme but i could not figure out how to include  the  filtering operation in that.  So kindly suggest any way out for this problem

[Jordan F]

Hi

You can either use the lower level filter vis in LabVIEW or an Express Vi.  The lower level functions can be found in the functions palette under Signal Processing>>Filters and the express vi is under Express>>Signal Analysis.  Also there are examples in the NI Example finder that shows how to integrate them into a program. 

Help>>Find Examples and search for Filter or filtering.  Some examples to review are Filter and Express Filter.vi but there are many others you could reference for your application.