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MultiTone信号FFT后如何计算THD

MultiTone信号FFT后如何计算THD

‎04-15-2014 02:39 AM

混合音频信号(如MultiTone)经过FFT变换后,如何计算THD值?如下图示为维基百科列出的THD计算公式.

 

 

\mathrm{THD_F} = \frac{ \sqrt{V_2^2 + V_3^2 + V_4^2 + \cdots + V_n^2} }{V_1}

 

 

如果混合信号中的某频率的倍频包含在其中,如何计算得到真实的THD?

 

 

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