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发表于 2017-1-1 01:58
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来自 贵州凯里
旋风腿 发表于 2017-1-1 01:51
随便搜搜就能找到资料 http://spectraplus.com/DT_help/total_harmonic_distortion.htm
Residual noise ...
我本来懒得解释这些基础知识,但是看你实在ZZ得可怜忍不住多敲几个字
你自己找的资料,打你自己的脸。
Total Harmonic Distortion (THD) - the ratio of the harmonic power to the fundamental power. It is computed by searching the entire spectrum to find the peak frequency (fundamental) and then calculating the total power in the harmonic frequencies. The THD level is then computed as the ratio of the total harmonic power to the fundamental power. Residual noise is not included in this calculation.
Total Harmonic Distortion + Noise (THD+N) - the ratio of the harmonic power plus noise to the fundamental power. It is computed by searching the entire spectrum to find the peak frequency (fundamental) and then calculating the total power in the remaining spectrum (harmonics plus noise). The THD level is then computed as the ratio of the total harmonic+noise power to the fundamental power.
看明白了吗?还不明白我也没办法了。
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