bandwidth filter.

[luz2]

Hello, I'm trying to filter signals. I put a photo of an example of a square signal of 50Hz. I use frequency_sample=150Hz>frequency_high. frequency_high=60Hz and frequency_low=40Hz and I haven`t results?

Can you help me? I can't understand what I'm not doing ok. I send you my file and a photo of the result.

Thank you very much.

[luz2]

Here is the photo, sorry

[luz2]

Sorry, here.

Thanks

[JaimeC]

1. Do not open more than one forum discussion for the same issue. I have seen you have open 3 for this filter issue.

2. What do you expect to see after filtering the signal? You want the square signal? You should now that a square signal has an infinite frequency response. See this external link:

http://www.goldammer.de/english/fft.htm

So if you make that filter you will have a sinewave (delta in frequency).

3. If you want to do it anyway introduce a higher order for the filter. Higher order high accuracy but more calculation time. See example IIR Filter Design (hep -> Find examples) and you can try how it works.

4. Do not introduce a waveform, as you can see the input for this funcion is an array of DBL. For waveforms (in LV 8.0) i recommend you to use the filter function. SIgnal processing -> Wfm Condition -> Filter

5. Visualize the FFT after the filter and not before and you will see how  the filter works.

Regards,

Jaime Cabrera

NI Applications Engineering