And they also subjected it to a technique called reflection-mode Fourier-transform infrared spectroscopy.

他们还对其进行了一种称为反射模式立叶变换红外光谱的技术。

Instead, you have to perform something called a Discreet Fourier Transform.

相反，您必须执行称为离散立叶变换的操作。

They needed to know how much of different frequencies were present which meant they needed to take a Fourier transform.

他们需知道存在多少不同的频率，这他们需进行立叶变换。

To complete one discrete Fourier transform requires multiplying N data points by N different frequency waves.

完成一次离散立叶变换，需将 N 个数据点乘以 N 个不同频率的波。

Basically, anytime a signal is processed, there's a good chance that a Fast Fourier Transform is involved.

基本上， 每当处理信号时，很有可能涉及快速立叶变换。

And one of the distinguishing features of a Discreet Fourier Transform is that the frequency spectrum is also discreet and finite.

离散立叶变换的显特征之一是频谱也是离散且有限的。

And there's also a really excellent video on the channel reducible, talking about the fast fourier transform, which is an algorithm for computing these more quickly.

还有一个关于通道可简化的非常出色的视频，谈论快速立叶变换，这是一种用于更快地计算这些的算法。

The real obstacle to detecting underground explosions wasn't the accuracy of the seismometers, it was the vast amounts of computation required to Fourier transform the seismometer signals.

探测地下爆炸的真正障碍不是地震仪的精度，而是对地震仪信号进行立叶变换所需的大量计算。

Filtering that out, by just smushing the spike down, what you'd be looking at is the Fourier transform of a sound that's just like your recording, only without that high frequency.

通过将尖峰压扁， 将其过滤掉，您将看到声音的立叶变换， 就像您的录音一样，只是没有高频。

So on your computer, most of the images will be saved in this form as a two dimensional Fast Fourier Transform and then when you wanna look at the picture again, the computer simply inverts the transform.

因此，在您的计算机上， 大多数图像将以二维快速立叶变换的形式保存， 然后当您想再次查看图片时，计算机只需反转变换即可。