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总谐波失真是指用信号源输入时,输出信号比输入信号多出的额外谐波成分。谐波失真是由于系统不是完全线性造成的,它通常用百分数来表示。所有附加谐波电平之和称为总谐波失真。一般说来,1000Hz频率处的总谐波失真最小,因此不少产品均以该频率的失真作为它的指标。但总谐波失真与频率有关,必须在20- 20000Hz的全音频范围内测出。
Total harmonic distortion is the extra harmonic content of the output signal more than the input signal when it is input with a signal source. Harmonic distortion is due to the system is not completely linear, it is usually expressed as a percentage. The sum of all additional harmonic levels is called total harmonic distortion. In general, the total harmonic distortion 1000Hz frequency minimum, so many products are the distortion of the frequency as its indicator. But the total harmonic distortion and frequency, must be measured in the 20 - 20000Hz full audio range.