How to reduce the noise/smooth and frequency diagram

Hello! I have a text file that contains a signal. I had read in a format of waveforms and trace the signal in the time domain. I then put the waveform to the PSD vi so graph of the waveform in the frequency domain. This chart has a lot of noise in it so I want to have a smoother graph.

One possible way to smooth out the graph is to take the average of a few points each time interval and graphic news values. So I took the time signal and divide it into tables (time) x and y (amplitude). Then, I took the Fourier amplitude and took of the absolute value of it.

From there, I'm trying to create a design where I would have the average of the values of fourier transform taken every 3 points and then add these points in a table. I would then draw this new table, spaced between 0 and the end point of the original frequency graph, which has a more smooth.

My drawing went horribly wrong, however. The graph resulting goes crazy while drawing a straight line, and I'm also not sure how to have the points evenly spaced to the end point of the graph original frequency. So I have attached my vi and my signal text file and I was wondering if someone could help me solve this problem. Thank you!

Yes, he was wrong.  You create a series of paintings to increase the length and the value of constant.  A filter for smoothing of 3 points is easy to implement with a shift register.  See the image below.

Lynn

Tags: NI Software

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