Point-by-Point Filter

[Ezequiel1111]

Hello,

I would like to know how to do a point by point filter, in the Help the point-by-point filter is referred but it mentions LabView and I do not find how to implemented in C#.

I am using a NarrowbandFirLowpassFilter and NarrowbandFirHighpassFilter. FilterData accepts only arrays

public double[] FilterData(
	double[] inputData
)

If not possible with this filter, can you recommend me which filter to use?

[Faeeque]

Hey Ezequiel, 

Below are some links to the different filter types and how to use them.

• Narrowband FIR Filters (Digital Filter Design Toolkit)
• NarrowbandFirHighpassFilterComplex Constructor (Double, Double, Double, Double)
• NarrowbandFirBandpassFilter Class

Mohammad Khawas

Technical Support Engineer

Support

ni.com

[Ezequiel1111]

Hi Mohammad,

Thanks for your response.

I see still the method: 

public double[] FilterData(double[] inputData)

But I still do not now how to do a point by point filter, calling FilterData seems to delete the history of the Filter, so I cannot call it with over an over with an array with only one element. 

So the question remains how to do this: http://zone.ni.com/reference/en-XX/help/375857B-01/mstudioanalysis/point_by_point_analysis/

Bests,

Ezequiel

[Flow75]

Hello,

The Butterworth filters have history between two FilterData calls.

[Ezequiel1111]

Hello,

How can I interpret the documentation to know that? I am really struggling with the documentation and examples 😞

And are there also FIR Point-by-Point or only IIR?

Best regards, Ezequiel

[Flow75]

It seems that the filters with memory between FilterData calls contains the Reset method.