But up to now there are only FFT and Cross-periodogram methods used in cross-spectral estimation.

但以往互谱估计都是采用FFT方法和互周期图法。

youdao

But up to now there are only FFT and Cross-periodogram methods used in cross-spectral estimation.

但以往互谱估计都是采用FFT方法和互周期图法。

youdao