Apply low pass filter on real time data

[EKANSH_CSIO]

Hi.. I am using a photo sensor with my NI DAQ card which sends a single value data to my lab view in real time. I am able to receive this data from the sensor and plot on waveform graph.  Now I want to apply low pass filter and frequency analyse on this data. I have tried SI Lowpass Filter.

Please guide what can i implement to solve this.

Thanks

[EKANSH_CSIO]

Hi.. I am using a photo sensor with my NI DAQ card which sends a single value data to my lab view in real time. I am able to receive this data from the sensor and plot on waveform graph.  Now I want to apply low pass filter and frequency analyse on this data. I have tried SI Lowpass Filter.

Please guide what can i implement to solve this.

Thanks

[GerdW]

Hi Ekan,

no need to post the same question twice!

You will get better responses as soon as you attach your current VI, with some example data embedded in controls as default value…

[EKANSH_CSIO]

Hi there, Thanks for replying.

I wanted to apply lpf and frequency analyse to this data which is plotted in waveform chart and also how can I obtain frequency, amplitude for the same.

Regards

[GerdW]

Hi Ekansh,

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@EKANSH_CSIO wrote:

I am using a photo sensor with my NI DAQ card which sends a single value data to my lab view in real time.

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Which "NI DAQ card" do you use?

All that can be seen is some FPGA-related code…

Btw.:

• Why don't you add x1&x2 in the FPGA?
• Why do you transfer y2 two times?
• Why are there so many coercion dots in this little VI?

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@EKANSH_CSIO wrote:

Now I want to apply low pass filter and frequency analyse on this data. I have tried SI Lowpass Filter.

Please guide what can i implement to solve this.

---

To apply a filter you need to collect your scalar samples in an array - or you use the PtByPt functions, which also provide a filter…

Btw.:

• Why do you want to use that "System Identification" filter function? Why not use the "simple" filter functions coming in the SignalAnalysis palette?
• Why do you use an ExpressVI (ToDDT) to wire a DDT wire to this filter function? Why don't you create the datatype that is expected by the filter (waveform array)?
• Why is there no timing in your VI?
• Which sample rates do you want to process? (Filters usually expect a fixed samplerate…)