Harmonic distrosion reduction dsp algorithms

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I captured live signal is oscilloscope and imported to matlab for analysis(sampled at 50e-06). I found that the signal carries lot of noise and has 2% THD. Now is there any solution or DSP algorithm to nullify THD and noise together?
 

Hi,

THD of a pure sinewave?
Or is it a mix of several frequencies?

How do you measure it?
If via FFT, then mask out all unwanted signals (frequencies) and perform an inverse FFT.

Klaus
 

Hi
I am attaching the image captured from Matlab. Basically I wanted computationally efficient method to remove harmonics, reduce THD to get a clean wrinkle free wave.
 

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