third-octave

[stewart342]

I want to make a program which can do Third-Octave Analysis. But I haven't any DAQ device of NI company. I use a DAQ device of Nicolet company. That device can tranfer the acquired data as a file to a computer, and then I can use a software to transform the data into ASCII format. The DAQ device hasn't an anti-alias filter. How can I make the program with LabView? My version of LabView is 5.1.

[Randy_H]

Stewart,

If you know where your frequencies lie in your signal, then you could write an algorithm to take them out.

Once a signal has been digitized, the signals will be aliased and frequencies will appear. Anti-aliasing is best done in the hardware. National Instruments does this through SCXI and SCC. You may want to look into SCC and see if you can add this to the outside of your system.

Randy Hoskin
Applications Engineer
National Instruments
http://www.ni.com/ask