THD calculation using FFT tool and mathematically

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moha
moha 2013-10-2
评论： Wayne King 2013-10-3
i used the FFT tools to compute the THD and it gave me a certain value. then, when i calculated the THD using a mathematical equation i got a different value. So, please i want to know how the FFT tools of powergui compute the THD. i.e, by which equation it calculate the THD?

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Wayne King
Wayne King 2013-10-2
Do you have Signal Processing Toolbox? If you do, see the function thd()
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moha
moha 2013-10-3
thanks a lot for your interest. yes i have a signal processing toolbox. but i didn't find the function thd() Please, explain to me what can i do exactly? Thanks
Wayne King
Wayne King 2013-10-3
which version of MATLAB are you using? which release?

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