How to make third-octave analysis program?

[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."

[Mike's NEWS]

The DAQ device from nicolet, Which product are you using? Nicolet have NI
drivers available for download. Then you could eliminate the conversion and
bring your data directly into Labview. As far as the anti-alias, most of
their (Nicolet) products provide some form of filtering, However, I would
need the product details.


"stewart342" wrote in message
news:5065000000080000006E6B0000-1031838699000@exchange.ni.com...
> "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."

[stewart342]

The DAQ device of nicolet is called 'vision'. What I mean is how can I make a VI to get the analysis result from the data acquired. Because I am not good at LabView and signal processing thoery, I hope you can give me a brief example. Though the device provides a filter, the cutoff frequency is not arbitrary. So another question is: If I don't use an analog anti-alias filter, can I use a digital filter instead? The raw data I've got is in ASCII format. The first column is the time, and the following columns are the signals acquired from each channel. Supposed the data haven't been filtered by the anti-alias filter.

[Mike's NEWS]

The task that you are inquiring about could become quite complicated. for
example, if you are performing acoustical analysis then frequency and power
become your primary points of interest. However if you are performing
analysis of shock and vibration then additional processing will be required.

I would recommend that we take this off of the news group and work direct.

I can be reached @ no_spam_mowest957@hotmail.com
remove no_spam_ for real address

Mike

"stewart342" wrote in message
news:50650000000500000044BD0000-1031838699000@exchange.ni.com...
> The DAQ device of nicolet is called 'vision'. What I mean is how can I
> make a VI to get the analysis result from the data acquired. Because I
> am not good at LabView and signal
processing thoery, I hope you can
> give me a brief example. Though the device provides a filter, the
> cutoff frequency is not arbitrary. So another question is: If I don't
> use an analog anti-alias filter, can I use a digital filter instead?
> The raw data I've got is in ASCII format. The first column is the
> time, and the following columns are the signals acquired from each
> channel. Supposed the data haven't been filtered by the anti-alias
> filter.