Data acquisition with octave

As far as I know in Octave there is no support for calling DLL's but there is a possibility via so called OCT files.
I found some info about that on the following page.

so called Comedi drivers and the Comedi library.
They have good support for National Instruments cards. yet.
However, since dynamically linked functions (in Oct-files) can be Comedi library, into such files and use them from Octave. features for serious work).
An exception is that you need to use some .

True octave analysis applies bandpass filters to the frequency range and averages each filter’s output to compute its power.
ObserVIEW performs filter-based analysis as it produces more accurate results.
ObserVIEW can also use FFT data—which measures the frequency content linearly—and assign the energy to the proportional octave.