FFTINTERVPARA settings

[ingluiseflorest]

Hello, I am working on FFT analysis.

When I am using DiademAUTO, I use the values for FFTINTERVPARA as constants, but now I want to define them according to the values of Lenght of Interval (1024) Start (1), Overlap (25) and Channel Lenght ("X") that I will be actually using. What formula do I need to use to calculate FFTINTERVPARA(1)?

Thank you.

[Brad_Turpin]

Hi ingluiseflorest,

This example may be overkill for your question, but I still recommend you look at the downloadable example "Joint-time Frequency Order Analysis":

http://zone.ni.com/devzone/conceptd.nsf/webmain/02A26930078B268986256E9000618BD7?opendocument

This example has a SUDialog which automatically sets these parameters for you. The actual VBScript code that executes the analysis is contained in a small, external VBScript, so you can see what values these parameters have and how to set them with the DIAdem commands.

What type of analysis exactly are you wanting to perform? It sounds like time-interval FFTs.

Brad Turpin
DIAdem Product Support Engineer
National Instruments