Usage of digital filters for real-time processing on sbRIO

[rghosh86]

Hi,

I am using sbRIO 9627 for real-time signal processing for the acquisition of 8 differential channels. For avoiding the effect of AC coupling, a digital FIR bandpass filter is used. It is observed that filter with filter order 100 is unable to remove ac coupling from the signal. So for this, by increasing filter order up to 200, we are getting a noise-free signal. My question is what kind of problem may be incorporated in real-time processing as the order of the filter is increased?

[PsyenceFact]

Hi rghosh86,

Doubling the filter order will double the delay applied by the filter.  I imagine that whether this causes a problem or not will depend on your application and how critical the delay is.

Just out of interest, what sort of filter are you using?  An order of 100 sounds like quite a lot for this type of application.

Andy