Butterworth on Labview 8.6 FPGA filter problem

Hello

I was testing the filters of reconfigurable low-pass butterworth on FPGA found from the Finder of example (using Reconfigurable Butterworth filter - R - series.lvproj). This VI generates a sinusoidal signal and passes through a filter of Butterworth. When I put the filter low pass frequency to a low value (~ 2 Hz) and generate a sinusoidal signal of 0.5 Hz filttered out is not so much more (see figure). The filter is 2nd order, so this is a characteristic of the filter? And what do I do if I want a taste of high-frequency and use a low cutoff value?

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--> I'm using Labview FPGA Module version 8.6 and PCI-7833R-map. LabVIEW 8.5, I remember that Butterworth filters, for above and below 2 kHz cutoff frequencies are actually different screws but on LV 8.6 they seem the same.

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-Heikki

Hi Heikki,

The reconfigurable version (IE, with 'See the terminal configuration' checked) does not support the implementation of low-frequency modified. This is because we cannot change the filter architectures running. The nonreconfigurable version, however, must use the same implementation updated him you saw in LabVIEW 8.5 for the low cutoff frequencies, defined here as the frequencies less de.01 * sampling frequency.

Your example of 100 kech sampling rate. / s and 2 Hz cut-off is pretty extreme, even for the implementation changed. The usual technique for situations like this must be a smoothing downsampling at a rate that is better suited to the break you need. Rational resampling of the FPGA Math palette & analysis is designed for this purpose.

Kind regards

Jim

Tags: NI Software

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