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How to calculate THD using calculator?

greatqs

I found the thd() in calculator only has  5 arguments (e.g. from, to, # samples, fundamental frequency).

For example, I'm doing a FFT with sample frequency of 8192KHz with from=1ms to=2ms and fundamental frequency is 5KHz.

I want to calculate the THD within 20 ~ 20KHz instead of 0 ~ 4096KHz which thd() does since it doesn't include Fmin/Fmax arguments.

 

Thanks,

qs

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